CREST Practitioner Security Analyst (CPSA) Practice

The protocol that allows a group of routers to use a shared virtual IP address is Virtual Router Redundancy Protocol (VRRP). VRRP operates by configuring multiple routers to share a virtual IP address, which ensures that if the primary router fails, one of the backup routers can take over the traffic without any disruption to the network services. In a VRRP configuration, one router serves as the Master (the one holding the virtual IP) while others act as backups. This redundancy is crucial for maintaining high availability in a network, as it enables seamless failover and ensures continuous service. The protocol uses a predetermined priority system to elect the Master router and defines the process by which a backup takes over the virtual IP in case of a failure. The other options pertain to different network functionalities. VTP (VLAN Trunking Protocol) is used for managing the VLAN configuration in Cisco switches and does not involve IP address sharing. STP (Spanning Tree Protocol) is focused on preventing loops in network topologies, ensuring a single active path through the network. WEP (Wired Equivalent Privacy) is a security protocol for wireless networks and does not relate to routing or IP address sharing. Understanding how VRRP operates provides insight into network redundancy and reliability