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OSPF Routing Configuration Flashcards

7 cards from real ACSP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In an Aruba switch running OSPF, what is the effect of configuring a router-id manually before any OSPF adjacencies form?

    Answer: The router uses the configured ID permanently even if loopback IPs change

    A manually configured router-id takes precedence over loopback or physical interface IPs and persists unless changed and OSPF is reset.

  2. Which OSPF network type is automatically assigned to an Aruba switch interface configured as a point-to-point VLAN link?

    Answer: Broadcast

    Ethernet/VLAN interfaces default to broadcast network type in OSPF unless explicitly changed with the ip ospf network command.

  3. An Aruba switch is configured with 'ip ospf passive-interface vlan 10'. What behavior change occurs on VLAN 10?

    Answer: OSPF hellos are suppressed, preventing neighbor formation but still advertising the network

    A passive interface suppresses OSPF hello packets, preventing adjacencies while still advertising the subnet as an OSPF route.

  4. What happens to OSPF routes when the OSPF process is restarted on an Aruba switch without graceful restart configured?

    Answer: All OSPF routes are immediately removed from the routing table during convergence

    Without graceful restart, restarting the OSPF process drops all OSPF-learned routes from the RIB until adjacencies re-form and SPF recalculates.

  5. In OSPF area design on Aruba switches, what is the primary purpose of a stub area?

    Answer: To reduce LSA flooding by blocking Type 5 external LSAs from entering the area

    Stub areas block Type 5 AS-external LSAs, reducing the LSDB size by replacing external routes with a default route from the ABR.

  6. When configuring OSPF on an Aruba switch, which command correctly places VLAN 20 (10.1.20.0/24) into OSPF area 0?

    Answer: Both 'network' command under router ospf and interface-level 'ip ospf area' are valid

    Aruba AOS-CX supports both the traditional 'network' statement under router ospf and the per-interface 'ip ospf area' command for placing interfaces into OSPF areas.

  7. What is the OSPF cost assigned to a 10 Gbps interface on an Aruba switch using the default reference bandwidth of 100 Mbps?

    Answer: 1

    OSPF cost = reference bandwidth / interface bandwidth; 100 Mbps / 10,000 Mbps = 0.01, which rounds up to the minimum cost of 1.