Which three statements about RIP timers are true? (Choose three.)
A.
The default update timer is 30 seconds.
B.
The default invalid timer is 180 seconds.
C.
The default holddown timer is 180 seconds.
D.
The default flush timer is 60 seconds.
E.
The default scan timer is 60 seconds.
The default hello timer is 5 seconds.
E.
The default scan timer is 60 seconds.
The default hello timer is 5 seconds.
Explanation:
The routing information protocol uses the following timers as part of its operation:
Update Timer
The update timer controls the interval between two gratuitous Response Message. By default the
value is 30 seconds. The response message is broadcast to all its RIP enabled interface.
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 neighbors. This timer must be set to a higher value than the invalid timer.
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.
Reference. http://en.wikipedia.org/wiki/Routing_Information_Protocol#Timers
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