CCNP Virtualization Practice Question

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

• ✓

  Enter global configuration mode, then configure 'router ospf <process-id>', then configure 'network <network-ip> <wildcard-mask> area <area-id>'

  Why this is correct

  The correct sequence begins in global configuration mode, then starts the OSPF routing process with 'router ospf <process-id>', and then enters the network statement as a subcommand of the OSPF router context. This order is mandatory because the 'network' command cannot be interpreted in global config mode; it only exists inside the OSPF process. Additionally, the 'area' keyword must accompany the wildcard mask to bind the matched interface to a specific OSPF area, which is fundamental to OSPF's area-based design. Therefore, enabling OSPF first, then defining networks with their area, is the only valid configuration path.

• ✗

  Enter global configuration mode, then configure 'network <network-ip> <wildcard-mask> area <area-id>', then configure 'router ospf <process-id>'

  Why it's wrong here

  Placing the 'network' command before starting the OSPF process is invalid because 'network' is not a global configuration command; it is a subcommand of the OSPF router mode. When entered in global config, the router either rejects it or treats it as an attempted global command, so the statement is never applied to any OSPF instance. Even if you later start an OSPF process, that earlier statement will not be retroactively associated with it, meaning you would have to reissue all network commands. Thus, this order fails to create any OSPF configuration and leaves adjacencies unformed.

• ✗

  Configure 'router ospf <process-id>', then enter global configuration mode, then configure 'network <network-ip> <wildcard-mask> area <area-id>'

  Why it's wrong here

  This order is impossible because 'router ospf <process-id>' is exclusively a global configuration command and cannot be executed from privileged EXEC mode before entering global configuration. If typed at the EXEC prompt, the router will return an '% Unknown command' error because the command is not available in that mode. Therefore, you must always enter global configuration mode first, then issue 'router ospf', and only then configure network statements within the resulting OSPF submode. Attempting to flip this sequence violates the IOS command-line hierarchy and cannot succeed.

• ✗

  Enter global configuration mode, then configure 'router ospf <process-id>', then configure 'network <network-ip> <wildcard-mask> <area-id>' without the 'area' keyword

  Why it's wrong here

  Omitting the 'area' keyword in the network command causes a syntax error because OSPF requires every network statement to include an area identifier to assign the matched interface to a specific OSPF area. The command 'network <network-ip> <wildcard-mask> <area-id>' is malformed; the correct syntax is 'network <network-ip> <wildcard-mask> area <area-id>'. Without the explicit 'area' keyword, the parser cannot distinguish the area-ID from a wildcard mask, so the command is rejected. Moreover, even if syntactically accepted, OSPF would have no way to determine area membership, which is essential for building the link-state database and SPF tree.