Which protocol is used for VLAN route redundancy in Alcatel switches?

• A. OSPF
• B. BGP
• C. VRRP
• D. RIP

Answer: (C)

The main idea here is gateway redundancy within a VLAN. VRRP is designed to give hosts in a VLAN a single virtual gateway IP that multiple routers can share. One device acts as the master and handles traffic, while other devices stay as backups. The hosts’ default gateway is the virtual IP, so traffic goes through the master router. If the master fails, a backup takes over as the new master and the virtual IP remains reachable, providing seamless failover and avoiding downtime for devices in the VLAN.

OSPF and BGP are routing protocols that exchange route information between different networks; they don’t provide immediate gateway failover for devices in a single VLAN. RIP is an older routing protocol that also routes between networks but doesn’t offer the built-in, fast gateway redundancy mechanism VRRP provides. So VRRP is the protocol used for VLAN route redundancy on Alcatel switches.