Explain the operation principle of the VRRP protocol and its main functions in network infrastructures.

VRRP (Virtual Router Redundancy Protocol) is a protocol that ensures the fault tolerance of routers in a network.

The main idea of VRRP is to create a virtual router with a virtual IP address, which is used by clients as the default gateway. Several physical routers are grouped together, where one of them becomes the "master" and is responsible for handling traffic on the virtual IP.

If the master fails, another router from the group automatically becomes the master, ensuring continuous network operation.

Main functions of VRRP:

• Increase the fault tolerance of the default gateway.
• Automatic switch to a backup router in case of primary failure.
• Reduce network downtime.

Working principle:

• All routers in the group exchange VRRP messages.
• The master periodically sends announcements about its status.
• If the backup router does not receive announcements from the master, it takes over the role of the master.

Thus, VRRP provides reliability and uninterrupted network connection for clients.