With distance vector routing protocols, it is never useful
to send
the same routing update packet back out the same interface
that it was
learned. This concept is called what?
A.) Holddown timers
B.) Poison Reverse
C.) Count to infinity
D.) Split Horizon
E.) Link State
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Answer: D
Split horizon is the concept of: 'Don't tell me what I just
told you.'
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The concept is called Split Horizon.
It is used to avoid rooting loops in a network.
Basic principle is - "Information about routing path for a
particular packet is never sent back on the interface from
which it was received".
In simple sense, we can say "DON'T TELL ME WHAT I JUST TOLD YOU"
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CCNA 
