Multiple choice

What range of networks will be advertised in the OSPF updates by the command Router1(config-router)# network 192.168.0.0 0.0.15.255 area 100?

  1. 192.168.0.0/24 through 192.168.0.15/24

  2. 192.168.0.0/24 through 192.168.15.0/24

  3. 192.168.16.0/24 through 192.168.255.0/24

  4. 192.168.15.0/24 through 192.168.31.0/24

  5. 192.168.15.0/24 through 192.168.255.0/24
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The wildcard mask 0.0.15.255 matches networks where the third octet ranges from 0 to 15. This means 192.168.0.0/24 through 192.168.15.0/24 will be advertised. The wildcard mask works by having 0 bits that must match exactly and 1 bits that can vary. The binary of 15 is 00001111, allowing the first 4 bits to match (giving 0-15) while the first two octets and last octet are fixed.

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