An administrator is configuring single-area OSPF on a router. One of the networks that must be advertised is 172.20.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement?
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 172.20.0.0 255.255.252.0. 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 172.20.0.0 255.255.252.0. What wildcard mask would the administrator use in the OSPF network statement?
- 0.0.15.255
- 0.0.3.255
- 0.0.7.255
- 0.0.1.255
Explanation: The easiest method to calculate an OSPF wildcard mask is to subtract the network's subnet mask from 255.255.255.255. For the network 172.20.0.0 with a subnet mask of 255.255.252.0, the calculation is:
255.255.255.255
- 255.255.252. 0
-----------------
0. 0. 3.255.
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