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Network+ Routing Protocols and Concepts Flashcards

7 cards from real COMPTIA 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. When a router has routes to the same destination from two different sources, which criterion is evaluated FIRST to select the best route?

    Answer: Administrative distance

    Administrative distance is evaluated first to determine the most trusted source; only routes from the same source type (same AD) then have their metrics compared.

  2. What is the default administrative distance of OSPF?

    Answer: 110

    OSPF has a default administrative distance of 110, placing it between EIGRP (90) and RIP (120) in terms of trustworthiness.

  3. What is a 'floating static route' used for in network design?

    Answer: A backup static route with a higher AD that activates when the primary route fails

    A floating static route is configured with a higher administrative distance than the primary route so it only enters the routing table if the primary route is removed.

  4. In a Cisco routing table, what does the 'C' code at the beginning of a route entry indicate?

    Answer: A directly connected network

    The 'C' code in a Cisco routing table identifies directly connected networks — networks on which the router has an active interface.

  5. What is the primary benefit of route summarization (also called supernetting or aggregation)?

    Answer: Reduces routing table size and decreases update traffic overhead

    Route summarization combines multiple contiguous routes into a single summary entry, reducing routing table size, memory usage, and the volume of routing update traffic.

  6. What is a routing loop and why is it problematic?

    Answer: A condition where packets circulate continuously between routers without reaching their destination

    A routing loop occurs when routers forward packets in a circular pattern due to inconsistent routing tables, consuming bandwidth and CPU while packets never reach their destination.

  7. Which loop-prevention mechanism stops a distance-vector router from advertising a route back out the interface on which it was learned?

    Answer: Split horizon

    Split horizon prevents routing loops by prohibiting a router from advertising a route back through the same interface from which the route was originally learned.