Split Horizon

[jonk34567]

What does split horizon prevent?

A.	routing loops, link state
B.	routing loops, distance vector
C.	switching loops, STP
D.	switching loops, VTP

Also can i have a explanation for the correct answer ?

[Georg Pauwen]

Hello,

answer B is the correct answer. Split horizon prevents routing loops in distance vector protocols.

Below is a simple example and a good explanation:

http://geek-university.com/ccna/split-horizon-explained/

[Flavio Miranda]

Hi @jonk34567

The correct answer is B. Distance Vector algorithm like RIP is very limited on the loop prevention as they send out the entire routing table out all the interfaces.

 Split horizon prevents the router from send the routing table to the interface from where it has learned it.

-If I helped you somehow, please, rate it as useful.-

[Julio E. Moisa]

Hi

As other member mentioned the answer is B, it is one of the layer 3 loop preventions used by vector distance protocols like RIP and EIGRP. 

A router running a vector distance routing protocol will be able to receive a routing update through an interface but the router will not allow to advertise that update to other routers through the interface where it was known.

Hope it is useful

:-)

[jonk34567]

is split horizon used on ospf and Eigrp ? 

[Julio E. Moisa · Accepted solution]

Hi

No, Split horizon is used on distance vector protocols: RIP and EIGRP only. 

:-)

[Deepak Kumar · Accepted solution]

Hi,
Answer B is correct.
For more explain please visit:
https://www.certificationkits.com/cisco-certification/ccna-articles/cisco-ccna-distance-vector-routing-protocols-2/count-to-infin-split-horizon-rt-poison-hold-down-timers/

Regards,
Deepak Kumar