CCNA Objective: Technology

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Questions derived from the 640-801 – Cisco Certified Network Associate (single-exam option) Cisco Self-Test Software Practice Test.

 

Objective: Technology
SubObjective: Evaluate the characteristics of routing protocols

 

Item Number: 640-801.4.4.15
Single Answer, Multiple Choice

 

What is an EIGRP feasible successor route?

 

 

  1. Backup route
  2. Primary route
  3. Default route
  4. Load-sharing route

 

Answer:
A. Backup route

 

Tutorial:
Feasible successors are the entries kept in the topology table. Each feasible successor is considered downstream from a successor route, which is the route considered to be the best route to a destination. Therefore, feasible successor routes are considered backup routes to successor routes.

 

EIGRP maintains three tables for each configured protocol:
Neighbor table – This table lists adjacent routers.
Topology table – This includes routing entries for all known routes. Feasible successors (backup routes) are also maintained in the topology table.
Routing table – This table lists the best (successor) routes to reach a destination.

 

When EIGRP selects successor routes, it also selects feasible successor routes at the same time. The successor routes are placed in the routing table and the feasible successors are placed in the topology table.

 

Reference:
1. ICND Student Guide v2.1 – Volume 1 – Enabling EIGRP
– EIGRP Features

 

2. Introduction to EIGRP at
http://www.cisco.com/warp/public/103/1.html#feasible

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