What are the default timers for RIPng?



What are the default timers for RIPng?
A. Update: 30 seconds Expire: 180 seconds Flush: 240 seconds
B. Update: 20 seconds Expire: 120 seconds Flush: 160 seconds
C. Update: 10 seconds Expire: 60 seconds Flush: 80 seconds
D. Update: 5 seconds Expire: 30 seconds Flush: 40 seconds

Correct Answer: A

Update Timer
The update timer controls the interval between two gratuitous Response Messages. By default the value is 30 seconds. The response message is broadcast to all its RIP enabled interface.[8]

Invalid Timer
The invalid timer specifies how long a routing entry can be in the routing table without being updated. This is
also called as expiration Timer. By default, the value is 180 seconds. After the timer expires the hop count of
the routing entry will be set to 16, marking the destination as unreachable.

Flush Timer
The flush timer controls the time between the route is invalidated or marked as unreachable and removal of
entry from the routing table. By default the value is 240 seconds. This is 60 seconds longer than Invalid timer. So for 60 seconds the router will be advertising about this unreachable route to all its neighbours. This timer must be set to a higher value than the invalid timer.[8]

Hold-down Timer
The hold-down timer is started per route entry, when the hop count is changing from lower value to higher
value. This allows the route to get stabilized. During this time no update can be done to that routing entry. This is not part of the RFC 1058. This is Cisco’s implementation. The default value of this timer is 180 seconds.