When a Distance Vector routing protocol detects that a connected
network has gone down, it sends out a special routing update
packet,
telling all directly connected routers that the distance to
the dead
network is infinity. This is an example of which routing
technology?
A.) ICMP.
B.) Only Link State routing protocols have this intelligence.
C.) Triggered updates.
D.) Garrison-4.
E.) Split Horizon.
F.) Poison Reverse.
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Answer: F
Instead of just removing the route from the routing update,
Poison
Reverse sets the distance to 'infinity' (for IP RIP this is
a hop count
of 16). This immediately makes the route invalid for all
neighboring
routers.
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