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Which three EIGRP routes will be present in the router R4’s routing table?

Refer to the exhibit.

Which three EIGRP routes will be present in the router R4’s routing table? (Choose three.)

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A.
172.16.1.0/24

B.
10.1.10.0/30

C.
10.0.0.0/8

D.
10.1.11.0/30

E.
172.16.0.0/16

F.
192.168.1.0/24

3 Comments on “Which three EIGRP routes will be present in the router R4’s routing table?”

  2. Jimbo says:

    Also, pay attention to R4’s output above. The “auto-summary” command is present which means that EIGRP is in the default state of “classful routing”. The command “no auto-summary” enables “classless routing” and would be displayed in the output as such. This would allow for the subnetting or VLSM routing.




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  3. Jimbo says:

    Then note the “classful” route choices to pick from. Because EIGRP is not configured with “no auto-summary”, we can only choose “classful” networks.

    0-127 Class A or /8
    129-191 Class B or /16
    192-223 Class C or /24

    Choices C, E and F are the correct answers because of “classful” route summary.

    10.0.0.0/8 = Class A
    172.16.0.0/16 = Class B
    192.168.1.0/24 = Class C




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