About This Flashcard Deck
This flashcard deck contains 10 cards covering key OSPF concepts for the CCNA exam. Test your OSPF knowledge for the CCNA 200-301 exam. Use active recall by attempting to answer each question before revealing the answer.
Question
What is the OSPF administrative distance?
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Answer
110
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All OSPF Flashcards
Q: What is the OSPF administrative distance?
A: 110
Q: What multicast address does OSPF use for all OSPF routers?
A: 224.0.0.5
Q: What is the default OSPF hello timer on a broadcast network?
A: 10 seconds. Dead timer = 40 seconds (4× hello).
Q: How is the OSPF router ID selected?
A: 1. Manually configured router-id. 2. Highest loopback IP. 3. Highest active interface IP.
Q: What must match for OSPF neighbors to form adjacency?
A: Area ID, hello/dead timers, authentication, subnet mask (on broadcast), stub area flag.
Q: What is the OSPF cost formula?
A: Cost = reference bandwidth / interface bandwidth. Default reference = 100 Mbps.
Q: When is DR/BDR elected in OSPF?
A: On broadcast and NBMA network types. NOT on point-to-point links.
Q: What OSPF state indicates a stable neighbor on a point-to-point link?
A: FULL state.
Q: What command advertises a default route in OSPF?
A: default-information originate (optionally with "always" keyword).
Q: What is a passive interface in OSPF?
A: An interface that participates in OSPF (advertised) but does not send/receive hello packets.
Cisco Flashcard Study Strategy
Cisco exams heavily test protocol operations and configuration details. Use these flashcards to drill port numbers, protocol behaviours, and administrative distances. Pair flashcard sessions with Packet Tracer labs — when you encounter a card about OSPF neighbour states, open a lab and verify each state transition on a live topology. This combination of memorisation and practice builds the deep understanding Cisco exams demand.