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200-101 · Question #23

A router is running three routing processes: RIP, OSPF, and EIGRP, each configured with default characteristics. Each process learns a route to the same remote network. If there are no static routes…

The correct answer is A. the route learned through EIGRP. When multiple routing protocols learn the same destination, the router uses Administrative Distance (AD) to select the best route. Lower AD wins. Default ADs are: EIGRP internal = 90, OSPF = 110, RIP = 120. Since EIGRP has the lowest AD (90), its route is installed in the…

Implement an EIGRP Based Solution

Question

A router is running three routing processes: RIP, OSPF, and EIGRP, each configured with default characteristics. Each process learns a route to the same remote network. If there are no static routes to the destination and none of the routes were redistributed, which route will be placed in the IP routing table?

Options

  • Athe route learned through EIGRP
  • Bthe route learned through OSPF
  • Cthe route learned through RIP
  • Dthe route with the lowest metric
  • Eall three routes with the router load balancing

How the community answered

(43 responses)
  • A
    74% (32)
  • B
    2% (1)
  • C
    14% (6)
  • D
    5% (2)
  • E
    5% (2)

Explanation

When multiple routing protocols learn the same destination, the router uses Administrative Distance (AD) to select the best route. Lower AD wins. Default ADs are: EIGRP internal = 90, OSPF = 110, RIP = 120. Since EIGRP has the lowest AD (90), its route is installed in the routing table. Metric is only compared between routes from the same routing protocol - it is not used to compare across different protocols. Load balancing across all three would only occur if they shared the same AD, which they do not by default.

Topics

#administrative distance#EIGRP#OSPF#RIP

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