CompTIA Network+ N10-006 Q127

Which of the following helps prevent routing loops?

A. Routing table
B. Default gateway
C. Route summarization
D. Split horizon

Correct Answer: D
Section: Troubleshooting

Routing loops occur when the routing tables on the routers are slow to update and a redundant communication cycle is created between routers. Split horizon, which prevents the router from advertising a route back to the other router from which it was learned, can be used to resist routing loops. Poison reverse, also known as split horizon with poison reverse, is also used to resist routing loops.