The following three networks are directly connected to an OSPF router; 192.168.0.0/24, 192.168.1.0/24, and 192.168.2.0/24. Which OSPF network command would advertise only the 192.168.1.0 network to neighbors?
- router(config-router)# network 192.168.1.0 0.0.0.0 area 0
- router(config-router)# network 192.168.1.0 0.0.0.255 area 0
- router(config-router)# network 192.168.1.0 255.255.255.255 area 0
- router(config-router)# network 192.168.0.0 0.0.15.255 area 0
Explanation: To advertise only the 192.168.1.0/24 network the wildcard mask used in the network command must match the first 24-bits exactly. To match bits exactly, a wildcard mask uses a binary zero. This means that the first 24-bits of the wildcard mask must be zero. The low order 8-bits can all be set to 1.
Exam with this question: CCNA 3 Module 2 Quiz - Single-Area OSPFv2 Configuration
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