Default Value of TTL in VRRP Advertisement

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The VRRP advertisement packet uses a time-to-live (TTL) value of 255 and cannot be forwarded beyond the local subnet on which it is sent. This value cannot be adjusted, and any packet that has a TTL value other than 255 is discarded.

The default value of the TTL (Time To Live) in a VRRP (Virtual Router Redundancy Protocol) advertisement is C. 64.

VRRP is a protocol used to provide redundancy for IP networks. It allows multiple routers to participate in a virtual router group, with one router acting as the active router and the other routers acting as standby routers. The active router is responsible for forwarding packets sent to the virtual IP address, and in case of failure, one of the standby routers takes over the role of the active router.

In VRRP, the routers send periodic advertisements to announce their state and priority. These advertisements are sent to the multicast address 224.0.0.18 with a TTL value of 255 by default. However, the TTL value can be configured to a different value using the "ttl" option in the VRRP configuration.

The TTL value determines how far the advertisement can propagate in the network. When a router receives an advertisement with a TTL value of 1, it decrements the TTL value to 0 and discards the advertisement. This prevents the advertisement from looping endlessly in the network.

In VRRP, the TTL value is set to a default value of 64 to limit the scope of the advertisement to the local network segment. This value is sufficient for most network topologies, but it can be adjusted based on the network design and requirements.

Therefore, the correct answer to the question is C. 64, which is the default value of the TTL in a VRRP advertisement.