CCENT/CCNA Icnd2 Chapt. 8
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Which of the following is true about how a router using a link-state routing protocol chooses the best route to reach a subnet?
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The router finds the best route in the link-state database.
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The router calculates the best route by running the SPF algorithm against the information in the link-state database.
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The router compares the metrics listed for that subnet in the updates received from each neighbor and picks the best (lowest) metric route.
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The CCENT exam is the first step towards obtaining certification. It covers some of the things we will discuss in depth once you start the CCNA exam. Have you just finished covering chapter 8 in class? Take this CCENT/CCNA icnd2 chapter 8 quiz and get to refresh your memory on the topics covered.
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- 2.
Which of the following situations would cause a router using RIP-2 to remove all the routes learned from a particular neighboring router?
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RIP keepalive failure
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No longer receiving updates from that neighbor
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Updates received 5 or more seconds after the last update was sent to that neighbor
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Updates from that neighbor have the global “route bad” flag
Correct Answer
A. No longer receiving updates from that neighborExplanation
Distance vector protocols rely on periodic full routing updates from their neighbors to confirm that the neighbor is still working.Rate this question:
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- 3.
Which of the following distance vector features prevents routing loops by advertising an infinite metric route when a route fails?
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Holddown
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Full updates
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Split horizon
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Route poisoning
Correct Answer
A. Route poisoningExplanation
Route poisoning means advertising the failed route with an “infinite” metric, as opposed to simply ceasing to advertise the route. Poison reverse is route poisoning by advertising a route that previously was not advertised because of split horizon.Rate this question:
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- 4.
Which of the following distance vector features prevents routing loops by causing the routing protocol to advertise only a subset of known routes, as opposed to the full routing table, under normal stable conditions?
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Counting to infinity
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Poison reverse
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Holddown
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Split horizon
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Route poisoning
Correct Answer
A. Split horizonExplanation
Split horizon causes a router to not advertise routes out an interface if the route would cause packets to be sent out that same interface.Rate this question:
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- 5.
Which of the following routing protocols are considered to use link-state logic?
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RIP-1
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RIP-2
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EIGRP
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OSPF
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Integrated IS-IS
Correct Answer(s)
A. OSPF
A. Integrated IS-ISExplanation
OSPF (Open Shortest Path First) and Integrated IS-IS (Intermediate System to Intermediate System) are the routing protocols that are considered to use link-state logic. Link-state routing protocols build a complete topology map of the network by exchanging information about the state of their links with neighboring routers. This information is then used to calculate the shortest path to a destination. RIP-1, RIP-2, and EIGRP are distance-vector routing protocols, which do not use link-state logic.Rate this question:
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- 6.
An internetwork is using a link-state routing protocol. The routers have flooded all LSAs, and the network is stable. Which of the following describes what the routers will do to reflood the LSAs?
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Each router refloods each LSA using a periodic timer that has a time similar to distance vector update timers.
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Each router refloods each LSA using a periodic timer that is much longer than distance vector update timers
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The routers never reflood the LSAs as long as the LSAs do not change.
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The routers reflood all LSAs whenever one LSA changes.
Correct Answer
A. Each router refloods each LSA using a periodic timer that is much longer than distance vector update timersExplanation
Link-state protocols reflood each LSA on a periodic but longer timer. With RIP, the update timer is 30 seconds, and with OSPF, the timer is 30 minutes.Rate this question:
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- 7.
Which of the following routing protocols are considered to use distance vector logic?
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RIP-1
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RIP-2
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EIGRP
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OSPF
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Integrated IS-IS
Correct Answer(s)
A. RIP-1
A. RIP-2Explanation
RIP-1 and RIP-2 are considered to use distance vector logic. Distance vector routing protocols determine the best path to a destination by considering the distance or metric to that destination. RIP-1 and RIP-2 use the hop count as the metric to determine the best path. They exchange routing information with neighboring routers and update their routing tables accordingly. EIGRP, OSPF, and Integrated IS-IS, on the other hand, use link-state logic where routers exchange information about the state of their links to determine the best path.Rate this question:
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- 8.
Which of the following interior routing protocols support VLSM?
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RIP-1
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RIP-2
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EIGRP
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OSPF
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Integrated IS-IS
Correct Answer(s)
A. RIP-2
A. EIGRP
A. OSPF
A. Integrated IS-ISExplanation
RIP-2, EIGRP, OSPF, and Integrated IS-IS support VLSM. VLSM (Variable Length Subnet Mask) allows for the creation of subnets with different subnet mask lengths within a network. RIP-1 does not support VLSM as it only uses classful routing, which means all subnets within a network must have the same subnet mask. However, RIP-2, EIGRP, OSPF, and Integrated IS-IS are classless routing protocols that can accommodate VLSM by allowing for the use of different subnet mask lengths for different subnets within a network.Rate this question:
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- 9.
Which of the following routing protocols use a metric that is, by default, at least partially affected by link bandwidth?
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RIP-1
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RIP-2
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EIGRP
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OSPF
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BGP
Correct Answer(s)
A. EIGRP
A. OSPFExplanation
EIGRP and OSPF are the routing protocols that use a metric that is, by default, at least partially affected by link bandwidth. EIGRP uses the bandwidth, delay, reliability, load, and MTU to calculate its metric, with bandwidth being one of the factors. OSPF uses the cost metric, which is inversely proportional to the bandwidth of the link. Both protocols take into consideration the link bandwidth in their metric calculations, making them suitable for determining the best path for routing traffic.Rate this question:
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- 10.
A router that is using a distance vector protocol just received a routing update that lists a route as having an infinite metric. The previous routing update from that neighbor listed a valid metric. Which of the following is not a normal reaction to this scenario?
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Immediately send a partial update that includes a poison route for the failed route
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Put the route into holddown state
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Suspend split horizon for that route and send a poison reverse route
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Send a full update listing a poison route for the failed route
Correct Answer
A. Send a full update listing a poison route for the failed routeExplanation
The router should not immediately send a full update. Instead, distance vector protocols immediately send a partial routing update, listing just the poisoned route.Rate this question:
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Mar 20, 2023Quiz Edited by
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Sep 30, 2009Quiz Created by
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