Cognizant Network Security Engineer Interview Questions and Answers

VLANs are established by configuring network switches to group devices into separate virtual networks.

• Access the switch's configuration interface

• Create VLANs and assign ports to each VLAN

• Configure VLAN trunks for inter-VLAN communication

• Implement VLAN tagging if necessary

• Test connectivity and ensure proper segregation

There are 7 OSI layers in the OSI model.

• There are 7 layers in the OSI (Open Systems Interconnection) model: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

• Each layer has specific functions and protocols that help in the communication process.

• For example, the Physical layer deals with the physical connection between devices, while the Application layer is responsible for user interfaces

IKEv2 is more secure and efficient than IKEv1 for IPsec VPN.

• IKEv2 supports more secure encryption algorithms and has better resistance to attacks.

• IKEv2 has faster negotiation and rekeying times, improving performance.

• IKEv2 allows for more flexibility in terms of authentication methods.

• IKEv1 is still widely used and supported, but IKEv2 is recommended for new deployments.

• Both IKEv1 and IKEv2 are used to establish a secu...read more

Upgrading OS in distributed mode requires careful planning and execution.

• Ensure compatibility of new OS with existing hardware and software

• Create a backup of all important data before starting the upgrade process

• Test the upgrade process in a non-production environment first

• Schedule the upgrade during a maintenance window to minimize disruption

• Monitor the upgrade process closely and have a rollback plan in case of issue