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An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 192.168.0.0 255.255.254.0. What wildcard mask would the administrator use in the OSPF network statement?

  • 0.0.15.255
  • 0.0.3.255
  • 0.0.1.255
  • 0.0.7.255
Explanation & Hint:

A wildcard mask is the inverse of a subnet mask. For the subnet mask 255.255.254.0, the binary representation is:

11111111.11111111.11111110.00000000

Inverting this binary representation gives us the wildcard mask:

00000000.00000000.00000001.11111111

This corresponds to the decimal wildcard mask:

0.0.1.255

Therefore, the administrator would use a wildcard mask of 0.0.1.255 in the OSPF network statement to advertise the network 192.168.0.0 with a subnet mask of 255.255.254.0.

For more Questions and Answers:

CCNA 3 v7 – ENSA v7.02 Final Exam Answers Full 100%

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