Practice Test Geeks(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test
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OSPF Configuration Flashcards

7 cards from real ICND1 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 OSPF Configuration flashcards as text

  1. Which OSPF network type is assigned by default on a Cisco Ethernet interface?

    Answer: Broadcast

    Ethernet interfaces default to the OSPF broadcast network type, which elects a DR and BDR.

  2. What is the OSPF router ID selection order when no explicit router-id is configured?

    Answer: Highest loopback IP, then highest active interface IP

    OSPF prefers the highest loopback IP as the router ID; if none exists, it uses the highest active physical interface IP.

  3. Which command changes the OSPF hello interval on an interface to 5 seconds?

    Answer: ip ospf hello-interval 5

    The interface-level command 'ip ospf hello-interval 5' sets the OSPF hello interval to 5 seconds.

  4. What happens when OSPF hello and dead timers are mismatched between two routers?

    Answer: Routers cannot form an adjacency

    OSPF requires matching hello and dead timers on both sides; a mismatch prevents adjacency formation.

  5. Which OSPF packet type is used to acknowledge receipt of LSAs?

    Answer: Link-State Acknowledgment (LSAck)

    LSAck packets provide reliable delivery acknowledgment for LSUs containing LSAs.

  6. In OSPF, what is the function of the Database Description (DBD) packet?

    Answer: Summarizes the contents of the LSDB during adjacency formation

    DBD packets summarize the router's LSDB entries so neighbors can compare and identify missing LSAs.

  7. Which OSPF state comes immediately after the Two-Way state during adjacency formation on a broadcast network?

    Answer: ExStart

    After Two-Way, routers enter ExStart to negotiate the master/slave relationship before exchanging DBD packets.