CCNA Chapter #4

21 Questions | Total Attempts: 479

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CCNA Chapter #4

Ccna exploration 4. 0 routing protocols and concepts Chapter 4


Questions and Answers
  • 1. 
    What is a routing loop?
    • A. 

      A packet bouncing back and forth between two loopback interfaces on a router.

    • B. 

      A condition where a return path from a destination is different from the outbound path forming a "loop".

    • C. 

      A condition where a packet is constantly transmitted within a series of routers without ever reaching it intended destination.

    • D. 

      The distribution of routes from one routing protocol to another.

  • 2. 
    Which of the following methods does split horizon use to reduce incorrect routing information?
    • A. 

      Routing updates are split in half to reduce the update time.

    • B. 

      Information learned from one source is not distributed back to the source.

    • C. 

      New route information must be learned from multiple sources to be accepted.

    • D. 

      The time between updates is split in half to speed convergence.

    • E. 

      New route information is suppressed until the system has converged.

  • 3. 
    A network administrator is evaluating RIP versus EIGRP for a new network.  The network will be sensitive to congestion and must respond quickly to topology changes.  What are two good reasons to choose EIGRP instead of RIP in this case?
    • A. 

      EIGRP uses periodic updates.

    • B. 

      EIGRP only updates affected neighbors.

    • C. 

      EIGRP uses broadcast updates.

    • D. 

      EIGRP updates are partial.

    • E. 

      EIGRP uses the efficient Bellman-Ford algorithm.

  • 4. 
    What actions will occur after router A loses connectivity to network 114.125.16.0? (Choose Two)
    • A. 

      Router B will include network 123.92.76.0 and 136.125.85.0 in its update to Router A.

    • B. 

      During the next update interval, Router B will send a RIP update out both ports that includes the inaccessible network.

    • C. 

      During the next update interval, Router C will send an update to Router B stating that network 114.125.16.0 is accessible in 2 hops.

    • D. 

      Router C will learn of the loss of connectivity to network 114.125.16.0 from Router B.

    • E. 

      Router B will include network 123.92.76.0 and 136.125.85.0 in its update to Router C.

  • 5. 
    Which of the following statements are correct about RIP?
    • A. 

      Uses broadcast to update all other routers in the network every 60 seconds.

    • B. 

      Uses a Multicast address to update other routers every 90 seconds.

    • C. 

      Will send out an update if there is a failure of a link.

    • D. 

      Updates only contain information about routes that have changed since last updates.

    • E. 

      RIP stands for Rest IN Pieces.

  • 6. 
    Which two conditions are most likely to cause a routing loop? (Choose two.)
    • A. 

      Random Jitter

    • B. 

      Implementation of classfull addressing

    • C. 

      Inconsistent routing tables

    • D. 

      Incorrectly configured static routes

    • E. 

      A network converging too quickly

  • 7. 
    Refer to the Exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?
    • A. 

      The path will be Router A >> Router B >> Router C >> Router E.

    • B. 

      The path will be Router A >> Router D >> Router E.

    • C. 

      Router A will load balance between Router A >> Router D >> Router E and Router A >> Router B >> Router C >> Router E paths.

    • D. 

      Packets will alternate paths depending on the order they arrive at router A.

  • 8. 
    What is the purpose of the TTL field in the IP Header?
    • A. 

      Used to mark routes as unreachable in updates sent to other routers.

    • B. 

      Prevents regular update messages from reinstating a route that may have gone bad.

    • C. 

      Prevents a router from advertising a network through the interface from which the update came.

    • D. 

      Limits the time or hops that a packet can traverse through the network before it should be discarded.

    • E. 

      Defines a maximum metric value for each distance vector routing protocol by setting a maximum hop count.

  • 9. 
    Which of the following can exist in a distance vector network that has not converged? (Choose Three)
    • A. 

      Routing Loops

    • B. 

      Inconsistent traffic forwarding

    • C. 

      No traffic forwarding until system converges

    • D. 

      Inconsistent routing table entries

    • E. 

      Routing table updates sent to wrong destinations

  • 10. 
    What does the RIP hold down timer do?
    • A. 

      Ensures an invalid route has a metric of 15

    • B. 

      Prevents a router from sending any updates after it has introduced a routing loop into the network

    • C. 

      Ensures every new route is valid before sending an update

    • D. 

      Instructs routers to ignore updates, for a specified time or event, about possible inaccessible routes.

  • 11. 
    Refer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

    • E. 

      6

  • 12. 
    Three routers running a distance-vector routing protocol lost all power, including the battery backups.  When the routers reload, what will happen?
    • A. 

      They will share all routes saved in NVRAM prior to the power loss with their directly connected neighbors.

    • B. 

      They will multicast hello packets to all other routers in the network to establish neighbor adjacencies.

    • C. 

      They will send updates that include only directly connected routes to their directly connected neighbors.

    • D. 

      They will broadcast their full routing table to all routers in the network.

  • 13. 
    Which two statements describe EIGRP?  (Choose Two)
    • A. 

      EIGRP can be used with Cisco and Non-Cisco routers.

    • B. 

      EIGRP sends triggered updates whenever there is change in topology that influences the routing information.

    • C. 

      EIGRP has an infinite metric of 16.

    • D. 

      EIGRP sends a partial routing table update, which includes just routes that have been changed

    • E. 

      EIGRP broadcasts its updates to all routers in the network.

  • 14. 
    The graffic shows a network that is configured to use RIP routing protocol.  Router2 detects that the link to Router1 has gone down.  It then advertises the network for this link with a hop count metric of 16.  Which routing loop prevention mechanism is in effect?
    • A. 

      Split Horizon

    • B. 

      Error Condition

    • C. 

      Hold-down Timer

    • D. 

      Route Poisoning

    • E. 

      Count to Infinity

  • 15. 
    What metric does the RIP routing protocol consider to be infinity?
    • A. 

      0

    • B. 

      15

    • C. 

      16

    • D. 

      224

    • E. 

      255

  • 16. 
    Which two statements are true regarding the function of the RIPv1 routing updates? (Choose Two)
    • A. 

      Updates are broadcast only when there are changes to the topology

    • B. 

      Updates are broadcast at regular intervals

    • C. 

      Broadcasts are sent to 0.0.0.0

    • D. 

      Broadcasts are send to 255.255.255.255

    • E. 

      Only changes are included in the updates

  • 17. 
    Which three routing protocols are distance vector routing protocols? (Choose Three)
    • A. 

      RIPv1

    • B. 

      EIGRP

    • C. 

      OSPF

    • D. 

      IS-IS

    • E. 

      RIPv2

  • 18. 
    Refer to the exhibit.  The routers in this network are running RIP.  Router A has not received an update from Router B in over three minutes.  How will Router A respond?
    • A. 

      The hold-down timer will wait to remove the route from the table for 60 seconds.

    • B. 

      The invalid timer will mark the route as unusable if an update has not been received in 180 seconds.

    • C. 

      The update timer will request an update for routes that were learned from Router B.

    • D. 

      The hello timer will expire after 10 seconds and the route will be flushed out the routing table.

    • E. 

      The gatekeeper will send out a network down message.

  • 19. 
    What does a Router running RIP do first with a new route that is received from an advertisement?
    • A. 

      Places it immediately in the routing table.

    • B. 

      Adjusts the metric for the new route to show the added distance for the route.

    • C. 

      Advertises this route out all other interfaces except the one that it came in on.

    • D. 

      Sends a ping packet to verify that the path is a feasible path.

    • E. 

      Strips off the encapsulation and adds it to the routing table.

  • 20. 
    Which event will cause a triggered update?
    • A. 

      An update routing timer expires.

    • B. 

      A corrupt update message is received.

    • C. 

      A route is installed in the routing table.

    • D. 

      The network is converged.

  • 21. 
    Which statement is true regarding Cisco's RIP_Jitter variable?
    • A. 

      It prevents the synchronization of routing updates by buffering the updates as they leave the router interfaces.

    • B. 

      It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.

    • C. 

      It prevents the synchronization of routing updates by causing the router to skip every other scheduled update time.

    • D. 

      It prevents the synchronization of routing updates by forcing the router to listen when its time for other updates on the lines before sending its update.