350-401 Question #698: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. Which configuration must be added to enable GigabitEthemet 0/1 to participate in OSPF?

Options

• ASF_router(config-router)# network 10.10.1.0 0.0.0.255 area 0
• BSF_rouier(config)# network 10.10.1.0 0.0.0.255 area 1
• CSF_router(config-router)# network 10.10.1.0 0.0.0.255 area 1
• DSF_rouler(config-router)# network 10.10.1.0 255.255.255.0 area 0

Explanation

To enable an interface for OSPF participation, the network command with the correct network address, wildcard mask, and area ID must be applied within the OSPF router configuration mode.

Common mistakes.

• A. While syntactically correct, this option assigns the network to Area 0, which may not be the intended area given the prompt or common OSPF design principles.
• B. The network command for OSPF configuration must be entered under router ospf <process-id> configuration mode (indicated by config-router), not global configuration mode (config).
• D. The wildcard mask for a /24 subnet (255.255.255.0) is 0.0.0.255, not 255.255.255.0, which would match only the host address 10.10.1.0.

Concept tested. OSPF network command configuration

Reference. https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-s/iro-15-s-book/iro-cfg.html#GUID-ED91C78D-B91F-433A-9F40-C272C8360D49

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