Oracle Cloud (OCI) Interview Questions – LOAD BALANCER

Q1. What is an Oracle Cloud Load Balancer, and what are its benefits?

A1. An Oracle Cloud Load Balancer is a service that distributes incoming network traffic across multiple compute resources, such as virtual machines or containers. Load Balancers improve the availability and scalability of your applications by ensuring that incoming requests are distributed evenly and efficiently to the appropriate backend resources. Benefits of using an Oracle Cloud Load Balancer include improved application performance, increased availability, and simplified management of application resources.

Q2. How do you create an Oracle Cloud Load Balancer, and what are the required steps?

A2. To create an Oracle Cloud Load Balancer, you can follow these steps:

Navigate to the Oracle Cloud Infrastructure Console and select the compartment where you want to create the Load Balancer.
Click on “Load Balancers” in the left-hand menu and then click on “Create Load Balancer.”
Select the type of Load Balancer you want to create (Public or Private), and then configure the Load Balancer’s networking details, including the VCN, subnet, and IP address type.
Add backend sets to define the backend resources that the Load Balancer will distribute traffic to. You can add backend sets manually or using automation tools like Terraform or Ansible.
Configure listeners and routing rules to determine how traffic is distributed across the backend resources. You can configure listeners for TCP, HTTP, HTTPS, and UDP traffic, and routing rules to direct traffic to specific backend sets based on protocol, path, or other criteria.
Finally, review and create the Load Balancer.

Q3. How do you add backend resources to an Oracle Cloud Load Balancer?

A3. To add backend resources to an Oracle Cloud Load Balancer, you can follow these steps:

Create a backend set and specify the backend resources you want to add, such as virtual machines, containers, or IP addresses.
Configure health checks to ensure that the backend resources are available and healthy before distributing traffic to them.
Add the backend set to the Load Balancer’s routing rules to direct traffic to the backend resources.
Optionally, configure session persistence to maintain user sessions across multiple requests.

Q4. How do you configure SSL/TLS encryption for an Oracle Cloud Load Balancer?

A4. To configure SSL/TLS encryption for an Oracle Cloud Load Balancer, you can follow these steps:

Obtain an SSL/TLS certificate and private key from a certificate authority or generate a self-signed certificate.
Upload the certificate and private key to the Load Balancer as a certificate bundle.
Configure listeners for HTTPS traffic and specify the certificate bundle to use for SSL/TLS encryption.
Optionally, configure SSL/TLS policies to enforce specific encryption ciphers and protocols.

Q5. How do you monitor an Oracle Cloud Load Balancer’s performance and health?

A5. To monitor an Oracle Cloud Load Balancer’s performance and health, you can use the following methods:

Use the Oracle Cloud Infrastructure Console to view Load Balancer metrics, including request rate, response time, and backend errors.
Use the Oracle Cloud Infrastructure API or CLI to programmatically retrieve Load Balancer metrics.
Configure alarms to notify you when certain metrics exceed predefined thresholds.
Enable access logs to capture detailed information about incoming requests and responses.

Q6. How do you configure a backend set to use IP-based access control for an Oracle Cloud Load Balancer?

A6. To configure a backend set to use IP-based access control for an Oracle Cloud Load Balancer, you can follow these steps:

Create a security list in the VCN that contains the IP addresses or CIDR blocks of the allowed sources.
Associate the security list with the subnet where the backend resources are located.
Add an ingress rule to the security list that allows traffic from the Load Balancer’s subnet on the required port or protocol.
Configure the backend set to use the security list as a source of allowed IP addresses or CIDR blocks.

Q7. How do you configure a listener for TCP traffic on an Oracle Cloud Load Balancer?

A7. To configure a listener for TCP traffic on an Oracle Cloud Load Balancer, you can follow these steps:

Navigate to the Load Balancer’s configuration in the Oracle Cloud Infrastructure Console.
Click on “Listeners” and then click on “Add Listener.”
Select the “TCP” protocol and specify the port number that the listener should listen on.
Configure the routing rules to direct incoming TCP traffic to the appropriate backend set.

Q8. How do you configure a listener for HTTP/HTTPS traffic on an Oracle Cloud Load Balancer?

A8. To configure a listener for HTTP/HTTPS traffic on an Oracle Cloud Load Balancer, you can follow these steps:

Navigate to the Load Balancer’s configuration in the Oracle Cloud Infrastructure Console.
Click on “Listeners” and then click on “Add Listener.”
Select the “HTTP” or “HTTPS” protocol and specify the port number that the listener should listen on.
Optionally, configure SSL/TLS encryption for HTTPS traffic using a certificate bundle.
Configure the routing rules to direct incoming HTTP/HTTPS traffic to the appropriate backend set.

Q9. How do you automate the creation of an Oracle Cloud Load Balancer using Terraform?

A9. To automate the creation of an Oracle Cloud Load Balancer using Terraform, you can follow these steps:

Define the required Terraform resources, including the Load Balancer, backend sets, listeners, and routing rules.
Configure the resources to use the appropriate networking details, backend resources, and routing criteria.
Use the Oracle Cloud Infrastructure Terraform Provider to authenticate to your Oracle Cloud Infrastructure account and apply the Terraform configuration.

Q10. How do you use the Oracle Cloud Infrastructure CLI to manage an Oracle Cloud Load Balancer?

A10. To use the Oracle Cloud Infrastructure CLI to manage an Oracle Cloud Load Balancer, you can follow these steps:Install and configure the Oracle Cloud Infrastructure CLI on your local machine.

Use the “oci lb” command to perform actions on the Load Balancer, such as creating, deleting, or updating it.
Use the “oci lb backend-set” command to manage backend sets, such as adding or removing backend resources.
Use the “oci lb listener” command to manage listeners and routing rules, such as adding or removing them.

Q11. How do you enable connection draining for an Oracle Cloud Load Balancer backend set?

A11. To enable connection draining for an Oracle Cloud Load Balancer backend set, you can follow these steps:

Navigate to the backend set configuration in the Oracle Cloud Infrastructure Console.
Click on “Edit” and then enable the “Connection Draining” option.
Specify the maximum time for the Load Balancer to wait before terminating connections to backend resources.
Optionally, specify a custom response to return to clients when a connection is drained.

Q12. How do you configure a routing rule to use a path-based backend set for an Oracle Cloud Load Balancer?

A12. To configure a routing rule to use a path-based backend set for an Oracle Cloud Load Balancer, you can follow these steps:

Create two or more backend sets and specify the backend resources for each one.
Configure a listener for HTTP or HTTPS traffic and specify the routing criteria as the request path.
Add multiple routing rules to the listener, each with a different path and a reference to the appropriate backend set.
Configure the Load Balancer to use the listener for incoming HTTP or HTTPS traffic.

Q13. How do you configure an Oracle Cloud Load Balancer to use an Oracle Database backend?

A13. To configure an Oracle Cloud Load Balancer to use an Oracle Database backend, you can follow these steps:

Create an Oracle Database instance in the same compartment as the Load Balancer.
Configure a backend set with the IP address of the database instance and the appropriate port for the database service.
Add the backend set to a routing rule that specifies the appropriate protocol and path for the database connection.
Configure any required network security rules or access controls to allow traffic from the Load Balancer to the database instance.

Q14. How do you configure SSL/TLS offloading for an Oracle Cloud Load Balancer?

A14. To configure SSL/TLS offloading for an Oracle Cloud Load Balancer, you can follow these steps:

Obtain an SSL/TLS certificate and private key from a certificate authority or generate a self-signed certificate.
Upload the certificate and private key to the Load Balancer as a certificate bundle.
Configure listeners for HTTPS traffic and specify the certificate bundle to use for SSL/TLS encryption.
Configure backend sets to use plain HTTP for communication with backend resources.
Optionally, configure SSL/TLS policies to enforce specific encryption ciphers and protocols.

Q15. How do you use the Oracle Cloud Infrastructure SDK to manage an Oracle Cloud Load Balancer?

A15. To use the Oracle Cloud Infrastructure SDK to manage an Oracle Cloud Load Balancer, you can follow these steps:

Install and configure the Oracle Cloud Infrastructure SDK for your programming language.
Use the SDK to authenticate to your Oracle Cloud Infrastructure account and access the Load Balancer service.
Use the SDK to perform actions on the Load Balancer, such as creating, deleting, or updating it.
Use the SDK to manage Load Balancer resources, such as backend sets, listeners, and routing rules.

Q16. How do you use an Oracle Cloud Load Balancer to distribute traffic to multiple regions?

A16. To use an Oracle Cloud Load Balancer to distribute traffic to multiple regions, you can follow these steps:

Create a Load Balancer in each region where you have backend resources.
Configure a listener for each Load Balancer and specify the routing criteria as the desired protocol and port.
Create DNS records for each Load Balancer, and configure them with the appropriate routing policy to distribute traffic to the Load Balancers based on geographic location or other criteria.

Q17. How do you enable cross-region failover for an Oracle Cloud Load Balancer?

A17. To enable cross-region failover for an Oracle Cloud Load Balancer, you can follow these steps:

Create a Load Balancer in each region where you have backend resources.
Configure a listener for each Load Balancer and specify the routing criteria as the desired protocol and port.
Create a health check for each backend set and specify the appropriate protocol and path.
Configure DNS records with a failover policy that directs traffic to the primary Load Balancer, but fails over to a secondary Load Balancer if the primary is unavailable.

Q18. How do you monitor backend resource health for an Oracle Cloud Load Balancer?

A18. To monitor backend resource health for an Oracle Cloud Load Balancer, you can follow these steps:

Configure a health check for each backend set and specify the appropriate protocol and path.
View health check metrics in the Oracle Cloud Infrastructure Console or programmatically using the API or CLI.
Configure alarms to notify you when backend resources fail health checks or when specific metrics exceed predefined thresholds.

Q19. How do you configure a backend set to use a private IP address for an Oracle Cloud Load Balancer?

A19. To configure a backend set to use a private IP address for an Oracle Cloud Load Balancer, you can follow these steps:

Assign a private IP address to the backend resource, either using DHCP or by assigning a static IP address.
Add the private IP address to the backend set configuration in the Load Balancer.
Ensure that the backend resource is located in the same VCN and subnet as the Load Balancer.

Q20. How do you configure an Oracle Cloud Load Balancer to use a custom domain name?

A20. To configure an Oracle Cloud Load Balancer to use a custom domain name, you can follow these steps:

Obtain a domain name and create a DNS record that maps the domain name to the Load Balancer’s IP address.
Create an SSL/TLS certificate for the domain name using a certificate authority or a self-signed certificate.
Upload the certificate to the Load Balancer as a certificate bundle.
Configure a listener for HTTPS traffic and specify the custom domain name as the host name.
Configure routing rules to direct incoming HTTPS traffic to the appropriate backend set.

Q21. How do you configure an Oracle Cloud Load Balancer to use a backend set with different protocols and ports?

A21. To configure an Oracle Cloud Load Balancer to use a backend set with different protocols and ports, you can follow these steps:

Create a backend set and specify the backend resources you want to use.
Configure a listener for each protocol and port combination that you want to support, such as TCP, HTTP, or HTTPS.
Add routing rules to each listener that direct traffic to the appropriate backend set based on the protocol and port number.

Q22. How do you configure an Oracle Cloud Load Balancer to use a backend set with IP addresses and domain names?

A22. To configure an Oracle Cloud Load Balancer to use a backend set with IP addresses and domain names, you can follow these steps:

Create a backend set and specify the backend resources you want to use, including IP addresses and domain names.
Configure health checks for each backend resource, using either IP addresses or domain names as appropriate.
Configure a listener for the desired protocol and port, and specify routing rules to direct traffic to the appropriate backend set.

Q23. How do you configure session persistence for an Oracle Cloud Load Balancer?

A23. To configure session persistence for an Oracle Cloud Load Balancer, you can follow these steps:

Create a session persistence configuration that specifies the criteria for maintaining user sessions, such as source IP address, cookie values, or SSL session IDs.
Associate the session persistence configuration with the Load Balancer listener or routing rules that require session persistence.
Optionally, configure a cookie name and timeout value for the session persistence configuration.

Q24. How do you configure an Oracle Cloud Load Balancer to use a different backend set for specific path patterns?

A24. To configure an Oracle Cloud Load Balancer to use a different backend set for specific path patterns, you can follow these steps:

Create two or more backend sets, and specify the backend resources you want to use for each one.
Configure a listener for HTTP or HTTPS traffic and specify the routing criteria as the request path.
Add multiple routing rules to the listener, each with a different path and a reference to the appropriate backend set.
Optionally, configure a default routing rule to direct unmatched traffic to a specific backend set.

Q25. How do you configure an Oracle Cloud Load Balancer to use an IP address whitelist?

A25. To configure an Oracle Cloud Load Balancer to use an IP address whitelist, you can follow these steps:

Create a security list in the VCN that contains the IP addresses or CIDR blocks of the allowed sources.
Associate the security list with the subnet where the backend resources are located.
Add an ingress rule to the security list that allows traffic from the Load Balancer’s subnet on the required port or protocol.
Configure the Load Balancer to use the security list as a source of allowed IP addresses or CIDR blocks.

Q26. How do you configure an Oracle Cloud Load Balancer to use an SSL/TLS policy?

A26. To configure an Oracle Cloud Load Balancer to use an SSL/TLS policy, you can follow these steps:

Create an SSL/TLS policy that specifies the minimum and maximum protocol versions, ciphers, and other SSL/TLS settings.

Associate the SSL/TLS policy with the Load Balancer listener or routing rules that require SSL/TLS encryption.

Optionally, configure a custom cipher suite order or disable certain ciphers for the SSL/TLS policy.

Q27. How do you configure an Oracle Cloud Load Balancer to use a custom health check script?

A27. To configure an Oracle Cloud Load Balancer to use a custom health check script, you can follow these steps:

Create a script that performs the required health check for your backend resources.
Upload the script to an object storage bucket in your Oracle Cloud Infrastructure account.
Configure the Load Balancer backend set to use the custom health check script, and specify the path to the script in the object storage bucket.
Configure a health check for the backend set and specify the appropriate protocol and path.

Q28. How do you configure an Oracle Cloud Load Balancer to use a routing rule with a custom HTTP header?

A28. To configure an Oracle Cloud Load Balancer to use a routing rule with a custom HTTP header, you can follow these steps:

Configure a listener for HTTP or HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired HTTP header, and specify the backend set to use for the routing rule.
Optionally, configure a default routing rule to direct unmatched traffic to a specific backend set.

Q29. How do you configure an Oracle Cloud Load Balancer to use backend sets in different compartments?

A29. To configure an Oracle Cloud Load Balancer to use backend sets in different compartments, you can follow these steps:

Grant permissions to the Load Balancer service to access the desired backend resources in different compartments.
Create backend sets for each compartment and specify the backend resources you want to use.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the appropriate backend set.

Q30. How do you use the Oracle Cloud Infrastructure REST API to manage an Oracle Cloud Load Balancer?

A30. To use the Oracle Cloud Infrastructure REST API to manage an Oracle Cloud Load Balancer, you can follow these steps:

Authenticate to the API using an API signing key or a user authentication token.
Use the Load Balancer API endpoints to perform actions on the Load Balancer, such as creating, deleting, or updating it.
Use the API endpoints for backend sets, listeners, and routing rules to manage the Load Balancer resources.

Q31. How do you configure an Oracle Cloud Load Balancer to use a custom error page?

A31. To configure an Oracle Cloud Load Balancer to use a custom error page, you can follow these steps:

Create a custom error page HTML file and store it in an object storage bucket in your Oracle Cloud Infrastructure account.
Configure a listener for HTTP or HTTPS traffic and specify the desired protocol and port.
Configure an error handling policy for the listener and specify the object storage bucket and file path for the custom error page.

Q32. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS termination at the backend?

A32. To configure an Oracle Cloud Load Balancer to use SSL/TLS termination at the backend, you can follow these steps:

Configure a backend set to use SSL/TLS encryption for communication with backend resources.
Obtain an SSL/TLS certificate and private key for the backend resources and upload them to the backend set configuration.
Configure the backend resources to use plain HTTP for communication with the Load Balancer.
Configure the Load Balancer listeners to use plain HTTP for communication with the backend set.

Q33. How do you configure an Oracle Cloud Load Balancer to use a health check with custom headers?

A33. To configure an Oracle Cloud Load Balancer to use a health check with custom headers, you can follow these steps:

Configure a backend set and specify the backend resources you want to use.
Configure a custom health check policy for the backend set and specify the protocol and path for the health check.
Optionally, configure custom headers for the health check that are sent to the backend resources.

Q34. How do you configure an Oracle Cloud Load Balancer to use cross-region load balancing with active-active failover?

A34. To configure an Oracle Cloud Load Balancer to use cross-region load balancing with active-active failover, you can follow these steps:

Create a Load Balancer in each region where you have backend resources.
Configure a listener for each Load Balancer and specify the routing criteria as the desired protocol and port.
Create DNS records for each Load Balancer, and configure them with a weighted routing policy to distribute traffic to the Load Balancers.
Configure health checks for each backend set and configure DNS failover policies to direct traffic to healthy Load Balancers.

Q35. How do you configure an Oracle Cloud Load Balancer to use a backend set with a mix of IP addresses and domain names?
A35. To configure an Oracle Cloud Load Balancer to use a backend set with a mix of IP addresses and domain names, you can follow these steps:

Create a backend set and specify the backend resources you want to use, including IP addresses and domain names.
Configure health checks for each backend resource, using either IP addresses or domain names as appropriate.
Configure a listener for the desired protocol and port, and specify routing rules to direct traffic to the appropriate backend set.

Q36. How do you configure an Oracle Cloud Load Balancer to use a routing rule with a custom HTTP method?

A36. To configure an Oracle Cloud Load Balancer to use a routing rule with a custom HTTP method, you can follow these steps:

Configure a listener for HTTP or HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired HTTP method, and specify the backend set to use for the routing rule.
Optionally, configure a default routing rule to direct unmatched traffic to a specific backend set.

Q37. How do you configure an Oracle Cloud Load Balancer to use a backend set with IPv6 addresses?

A37. To configure an Oracle Cloud Load Balancer to use a backend set with IPv6 addresses, you can follow these steps:

Create a backend set and specify the IPv6 addresses of the backend resources you want to use.
Configure health checks for each backend resource using the appropriate IPv6 protocol and path.
Configure a listener for the desired protocol and port, and specify routing rules to direct traffic to the appropriate backend set.

Q38. How do you configure an Oracle Cloud Load Balancer to use a routing rule with a custom HTTP header value?

A38. To configure an Oracle Cloud Load Balancer to use a routing rule with a custom HTTP header value, you can follow these steps:

Configure a listener for HTTP or HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired HTTP header value, and specify the backend set to use for the routing rule.
Optionally, configure a default routing rule to direct unmatched traffic to a specific backend set.

Q39. How do you configure an Oracle Cloud Load Balancer to use a backend set with different path prefixes?

A39. To configure an Oracle Cloud Load Balancer to use a backend set with different path prefixes, you can follow these steps:

Create a backend set and specify the backend resources you want to use.
Configure a listener for HTTP or HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired path prefix, and specify the backend set to use for the routing rule.

Q40. How do you use an Oracle Cloud Load Balancer with an Oracle Database backend?

A40. To use an Oracle Cloud Load Balancer with an Oracle Database backend, you can follow these steps:

Create an Oracle Database deployment in a Compute instance or Autonomous Database instance.
Configure the database listener to use a specific port and protocol, such as TCP or Oracle Net.
Create a backend set for the database and specify the database listener IP address and port number.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the database backend set.

Q41. How do you configure an Oracle Cloud Load Balancer to use path-based routing?

A41. To configure an Oracle Cloud Load Balancer to use path-based routing, you can follow these steps:

Configure a listener for HTTP or HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired path prefix, and specify the backend set to use for the routing rule.
Optionally, configure a default routing rule to direct unmatched traffic to a specific backend set.

Q42. How do you configure an Oracle Cloud Load Balancer to use health check retries?

A42. To configure an Oracle Cloud Load Balancer to use health check retries, you can follow these steps:

Configure a backend set and specify the backend resources you want to use.
Configure a health check policy for the backend set and specify the number of retries to use before marking a backend as failed.
Configure a listener for the desired protocol and port, and specify routing rules to direct traffic to the appropriate backend set.

Q43. How do you configure an Oracle Cloud Load Balancer to use multiple SSL/TLS certificates?

A43. To configure an Oracle Cloud Load Balancer to use multiple SSL/TLS certificates, you can follow these steps:

Create a backend set and specify the backend resources you want to use.
Obtain multiple SSL/TLS certificates for the desired domain names or subdomains, and upload them to the backend set configuration.
Configure a listener for the desired protocol and port, and specify routing rules to direct traffic to the appropriate backend set based on the requested domain name or subdomain.

Q44. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS passthrough?

A44. To configure an Oracle Cloud Load Balancer to use SSL/TLS passthrough, you can follow these steps:

Create a backend set and specify the backend resources you want to use.
Configure SSL/TLS encryption on the backend resources and obtain an SSL/TLS certificate and private key for each one.
Configure a listener for the desired protocol and port, and specify routing rules to direct traffic to the appropriate backend resource based on the requested domain name or IP address.
Configure the listener to use SSL/TLS passthrough for the backend resources.

Q45. How do you use an Oracle Cloud Load Balancer with an Oracle WebLogic Server backend?

A45. To use an Oracle Cloud Load Balancer with an Oracle WebLogic Server backend, you can follow these steps:

Create an Oracle WebLogic Server deployment in a Compute instance or Kubernetes cluster.
Configure the WebLogic Server listen address and port for the desired protocol, such as HTTP or HTTPS.
Create a backend set for the WebLogic Server and specify the server listen address and port.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the WebLogic Server backend set.

Q46. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS with a client certificate?

A46. To configure an Oracle Cloud Load Balancer to use SSL/TLS with a client certificate, you can follow these steps:

Create an SSL/TLS certificate for the Load Balancer listener, and obtain a client certificate for each client that will be connecting to the Load Balancer.
Upload the client certificates to the Load Balancer configuration and associate them with the desired listener or routing rules.
Configure the Load Balancer to require SSL/TLS client authentication for the associated listener or routing rules.

Q47. How do you configure an Oracle Cloud Load Balancer to use IP-based access control?

A47. To configure an Oracle Cloud Load Balancer to use IP-based access control, you can follow these steps:

Configure a listener for HTTP or HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired path prefix, and specify the backend set to use for the routing rule.
Optionally, configure a default routing rule to direct unmatched traffic to a specific backend set.
Configure an access control policy for the listener or routing rules, and specify the IP address ranges that are allowed or denied access.

Q48. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS termination with a third-party certificate authority?

A48. To configure an Oracle Cloud Load Balancer to use SSL/TLS termination with a third-party certificate authority, you can follow these steps:

Obtain an SSL/TLS certificate and private key from the certificate authority for the desired domain name or subdomain.
Upload the certificate and private key to the Load Balancer configuration.
Configure a backend set to use plain HTTP for communication with the backend resources.
Configure a listener for the desired protocol and port, and configure the SSL/TLS termination settings to use the uploaded certificate and private key.

Q49. How do you configure an Oracle Cloud Load Balancer to use connection draining?

A49. To configure an Oracle Cloud Load Balancer to use connection draining, you can follow these steps:

Configure a backend set and specify the backend resources you want to use.
Configure a health check policy for the backend set and specify the path for the health check.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the backend set.
Configure a connection draining policy for the listener, and specify the time period for draining existing connections before removing a backend resource from the backend set.

Q50. How do you use an Oracle Cloud Load Balancer with an Oracle Cloud Infrastructure compute instance backend?

A50. To use an Oracle Cloud Load Balancer with an Oracle Cloud Infrastructure compute instance backend, you can follow these steps:

Create a backend set and specify the IP address of the compute instance you want to use.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the backend set.
Configure security list rules for the compute instance to allow traffic from the Load Balancer IP addresses.

Q51. How do you configure an Oracle Cloud Load Balancer to use server name indication (SNI) for SSL/TLS connections?

A51. To configure an Oracle Cloud Load Balancer to use server name indication (SNI) for SSL/TLS connections, you can follow these steps:

Obtain SSL/TLS certificates for each domain name or subdomain you want to use, and upload them to the Load Balancer configuration.
Configure a listener for the desired protocol and port, and specify the SSL/TLS termination settings to use SNI.
Add routing rules to the listener that match the desired domain name or subdomain, and specify the backend set to use for the routing rule.

Q52. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS mutual authentication?

A52. To configure an Oracle Cloud Load Balancer to use SSL/TLS mutual authentication, you can follow these steps:

Obtain SSL/TLS certificates for the Load Balancer listener and each client that will be connecting to the Load Balancer.
Upload the client certificates to the Load Balancer configuration and associate them with the desired listener or routing rules.
Configure the Load Balancer to require SSL/TLS mutual authentication for the associated listener or routing rules.

Q53. How do you configure an Oracle Cloud Load Balancer to use route weighting for load balancing?

A53. To configure an Oracle Cloud Load Balancer to use route weighting for load balancing, you can follow these steps:

Configure a backend set and specify the backend resources you want to use.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the backend set.
Configure a route weighting policy for the listener or routing rules, and specify the weights for each backend resource.

Q54. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS offloading?

A54. To configure an Oracle Cloud Load Balancer to use SSL/TLS offloading, you can follow these steps:

Obtain an SSL/TLS certificate and private key for the desired domain name or subdomain.
Upload the certificate and private key to the Load Balancer configuration.
Configure a backend set to use plain HTTP for communication with the backend resources.
Configure a listener for the desired protocol and port, and configure the SSL/TLS termination settings to use the uploaded certificate and private key.

Q55. How do you use an Oracle Cloud Load Balancer with an Oracle Cloud Infrastructure File Storage service (NFS) backend?

A55. To use an Oracle Cloud Load Balancer with an Oracle Cloud Infrastructure File Storage service (NFS) backend, you can follow these steps:

Configure an NFS export on the File Storage service and specify the mount target IP address and export path.
Create a backend set for the NFS export and specify the mount target IP address and port number.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the NFS backend set.

Q56. How do you configure an Oracle Cloud Load Balancer to use source IP affinity for load balancing?

A56. To configure an Oracle Cloud Load Balancer to use source IP affinity for load balancing, you can follow these steps:

Configure a backend set and specify the backend resources you want to use.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the backend set.
Configure a session persistence policy for the listener or routing rules, and specify source IP affinity as the session persistence method.

Q57. How do you configure an Oracle Cloud Load Balancer to use HTTP/2?

A57. To configure an Oracle Cloud Load Balancer to use HTTP/2, you can follow these steps:

Configure a listener for HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired HTTP path, and specify the backend set to use for the routing rule.
Configure an SSL/TLS certificate for the listener and enable HTTP/2 support.

Q58. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS passthrough with multiple certificates?

A58. To configure an Oracle Cloud Load Balancer to use SSL/TLS passthrough with multiple certificates, you can follow these steps:

Configure a backend set and specify the backend resources you want to use.
Configure SSL/TLS encryption on the backend resources and obtain an SSL/TLS certificate and private key for each one.
Configure a listener for the desired protocol and port, and configure the SSL/TLS termination settings to use SSL/TLS passthrough.
Add routing rules to the listener that match the desired domain name or IP address, and specify the backend resource to use for the routing rule based on the SSL/TLS certificate presented by the client.

Q59. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS with OCSP stapling?

A59. To configure an Oracle Cloud Load Balancer to use SSL/TLS with OCSP stapling, you can follow these steps:

Obtain an SSL/TLS certificate and private key for the desired domain name or subdomain.
Enable OCSP stapling on the Load Balancer listener or routing rules.
Configure the SSL/TLS termination settings to use the uploaded certificate and private key.

Q60. How do you use an Oracle Cloud Load Balancer with an Oracle Cloud Infrastructure Virtual Machine (VM) cluster backend?

A60. To use an Oracle Cloud Load Balancer with an Oracle Cloud Infrastructure VM cluster backend, you can follow these steps:

Create a VM cluster and specify the desired backend resources.
Configure a backend set for the VM cluster and specify the IP address and port number for the backend resource.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the VM cluster backend set.

Q61. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS with a custom certificate authority?

A61. To configure an Oracle Cloud Load Balancer to use SSL/TLS with a custom certificate authority, you can follow these steps:

Obtain an SSL/TLS certificate and private key from the certificate authority for the desired domain name or subdomain.
Upload the certificate and private key to the Load Balancer configuration.
Configure a listener for the desired protocol and port, and configure the SSL/TLS termination settings to use the uploaded certificate and private key.
Optionally, configure the Load Balancer to validate client certificates using the custom certificate authority.

Q62. How do you configure an Oracle Cloud Load Balancer to use network security groups for access control?

A62. To configure an Oracle Cloud Load Balancer to use network security groups for access control, you can follow these steps:

Create a network security group and specify the desired inbound and outbound security rules.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the backend set.
Configure an access control policy for the listener or routing rules, and specify the network security group to use for access control.

Q63. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS with certificate revocation checks?

A63. To configure an Oracle Cloud Load Balancer to use SSL/TLS with certificate revocation checks, you can follow these steps:

Obtain an SSL/TLS certificate and private key for the desired domain name or subdomain.
Enable certificate revocation checks on the Load Balancer listener or routing rules.
Configure the SSL/TLS termination settings to use the uploaded certificate and private key.

Q64. How do you use an Oracle Cloud Load Balancer with an Oracle Database backend?

A64. To use an Oracle Cloud Load Balancer with an Oracle Database backend, you can follow these steps:

Create an Oracle Database deployment in a Compute instance or Kubernetes cluster.
Configure the database listener and specify the desired port number.
Create a backend set for the database and specify the database listener IP address and port number.
Configure a listener for the desired protocol and port, and add routing rules that direct traffic to the database backend set.

Q65. How do you configure an Oracle Cloud Load Balancer to use SSL/TLS with HSTS (HTTP Strict Transport Security)?

A65. To configure an Oracle Cloud Load Balancer to use SSL/TLS with HSTS, you can follow these steps:

Configure a listener for HTTPS traffic and specify the desired protocol and port.
Add routing rules to the listener that match the desired HTTP path, and specify the backend set to use for the routing rule.
Configure an SSL/TLS certificate for the listener and enable HSTS support.

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Brijesh Gogia

I’m an experienced Cloud/Oracle Applications/DBA Architect with more than 15 years of full-time DBA/Architect experience. I have gained wide knowledge on Oracle and Non-Oracle software stack running on-prem and on Cloud and have worked on several big projects for multi-national companies. I enjoy working with leading-edge technology and have a passion for Cloud architecture, automation, database performance, and stability. Thankfully my work allows me time for researching new technologies (and to write about them).

Oracle Cloud (OCI) Interview Questions – LOAD BALANCER

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