Cognizant Network Security Engineer Interview Questions and Answers for Freshers

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

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