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Which answer gives the reason for the omission?

Router R1 has working interfaces S0/0, S0/1, and S0/2, with IP address/prefix combinations
of 10.10.10.1/24, 10.10.11.2/24, and 10.10.12.3/22. R1’s configuration includes the
commands router eigrp 9 and network 10.0.0.0. The show ip eigrp interfaces command lists
S0/0 and S0/1 in the command output, but not S0/2. Which answer gives the reason for the
omission? (Choose two answers.)

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A.
R1 has EIGRP neighbors reachable via S0/0 and S0/1, but not via S0/2, so it is not
included.

B.
S0/2 may currently be in a state other than up/up.

C.
The network 10.0.0.0 command requires the use of mask 255.0.0.0 due to EIGRP being
classful by default.

D.
S0/2 may be configured as a passive interface.

Explanation:
The show ip eigrp interfaces command displays working (up/up) interfaces on which EIGRP
has been enabled but omits passive interfaces. A failure of the interface, or making the
interface passive, would omit the interface from the output of this command.

9 Comments on “Which answer gives the reason for the omission?”

  3. Davide says:

    The answer in wrong because even if the IF is in admin down state, the show ip eigrp interfaces command list the IF that is running eigrp. The correct answers are C and D.




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    1. Marek says:

      “show ip eigrp interfaces” Lists the working interfaces on which EIGRP is enable (based on the “network” commands);it omits passive interfaces.
      Cisco Official Cert Guide by Kevin Wallace




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