An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 10.27.27.0 255.255.255.0. What wildcard mask would the administrator use in the OSPF network statement?
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Last Updated: May 9, 2026
IT Exam Items Repository › Category: CCNA 3 v7 › An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 10.27.27.0 255.255.255.0. What wildcard mask would the administrator use in the OSPF network statement?
An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 10.27.27.0 255.255.255.0. What wildcard mask would the administrator use in the OSPF network statement?
- 0.0.0.63
- 0.0.0.255
- 0.0.0.31
- 0.0.0.15
Explanation: To calculate the wildcard mask for an OSPF network statement, you subtract the subnet mask from a "quad-255" address (255.255.255.255). For the subnet mask 255.255.255.0, the calculation is 255.255.255.255 minus 255.255.255.0, which equals 0.0.0.255. This mask tells the OSPF process to match the first three octets exactly while ignoring the last octet.
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