350-401 Question #675: Real Exam Question with Answer & Explanation

Question

Refer to the exhibit. An engineer must allow R1 to advertise the 192.168.1.0/24 network to R2. R1 must perform this action without sending OSPF packets to SW1. Which command set should be applied?

Options

• AR1(confg)# router ospf 1
• BR1(config)# router ospf 1
• CR1(config)# interface gig0/0
• DR1(config)# interface gig0/0

Explanation

To advertise a network via OSPF while preventing OSPF packets from being sent on a specific interface, configure the network under the OSPF process and make that specific interface passive.

Common mistakes.

• A. While using passive-interface default and then selectively activating an interface can work, this approach is less direct than specifically making the desired interface passive when only one particular interface needs this configuration.
• C. The ip ospf passive-interface command on the interface configuration makes the interface passive, but this option lacks the necessary network command under the OSPF router configuration to include the 192.168.1.0/24 network into the OSPF process for advertisement to R2.
• D. These commands configure OSPF authentication and hello intervals, which are unrelated to the requirements of advertising a specific network and preventing OSPF packets on a particular interface.

Concept tested. OSPF network advertisement and passive interface

Reference. https://www.cisco.com/c/en/us/td/docs/ios/iproute_ospf/command/reference/ior_book.html#wp1026402

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