200-301 Question #749: Real Exam Question with Answer & Explanation

Question

Which two statements correctly describe distance-vector routing protocols? (Choose two)

Options

• Athey specify the next hop toward the destination subnet
• Bthey require quick network convergence to support normal operations
• Cthey generate a complete topology of the network
• Dthey update other devices on the network when one device detects a topogy chage
• Ethey use a variety of metrics to identify the distance to a destination network.

Explanation

Distance-vector routing protocols determine the best path to a destination by exchanging routing tables with neighbors and specify the next hop based on various metrics to identify the 'distance'.

Common mistakes.

• B. Distance-vector protocols, particularly older ones like RIP, are known for slower convergence times compared to link-state protocols due to issues like count-to-infinity.
• C. Distance-vector protocols do not build a complete topology map of the network; instead, each router maintains only its own routing table, learning paths from its immediate neighbors.
• D. Distance-vector protocols propagate topology changes hop-by-hop to their neighbors, rather than immediately updating all other devices across the entire network.

Concept tested. Distance-vector routing protocol characteristics

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_rip/configuration/15-mt/rip-15-mt-book/rip-cfg-ip-rout.html

No community discussion yet for this question.