CCNA3 ScaN v6.0 Chapter 6 Exam Answers 2018 2019

Last Updated on March 15, 2019 by Admin

1. When an EIGRP-enabled router uses a password to accept routes from other EIGRP-enabled routers, which mechanism is used?

   •  bounded updates
   •  partial updates
   •  EIGRP authentication
   •  Diffusing Update Algorithm
   •  Reliable Transport Protocol

   Explanation: EIGRP authentication allows a router to accept routing information only from other routers that are configured with the same password.

2. What is the purpose of using protocol-dependent modules in EIGRP?

   •  to describe different routing processes
   •  to identify different application layer protocols
   •  to use different transport protocols for different packets
   •  to accommodate routing of different network layer protocols

   Explanation: EIGRP is designed to route several network layer protocols by using the PDMs. For example, EIGRP can be used to route both IPv4 and IPv6, as well as other network layer protocols. There is a separate instance of PDM for different network layer protocols.

3. If all router Ethernet interfaces in an EIGRP network are configured with the default EIGRP timers, how long will a router wait by default to receive an EIGRP packet from its neighbor before declaring the neighbor unreachable?
   •  10 seconds
   •  15 seconds
   •  20 seconds
   •  30 seconds

   Explanation: EIGRP uses the hold time as the maximum time it should wait for receiving a hello packet (or other EIGRP packets) from its neighbor before declaring that the neighbor is unreachable. By default the hold time is 3 times greater than the hello interval. On LAN interfaces, the default hello time is 5 seconds and the default hold time is 15 seconds.

4. Which statement describes a characteristic of the delivery of EIGRP update packets?
   •  EIGRP uses UDP to send all update packets.
   •  EIGRP sends all update packets via unicast.
   •  EIGRP sends all update packets via multicast.
   •  EIGRP uses a reliable delivery protocol to send all update packets.

   Explanation: EIGRP uses a reliable delivery protocol to send update packets. Depending on the need, EIGRP may send update packets with unicast or multicast. For example, update packets are sent as a multicast when required by multiple routers, or as a unicast when required by only a single router.

5. Which two EIGRP packet types are sent with unreliable delivery? (Choose two.)
   •  update
   •  query
   •  hello
   •  reply
   •  acknowledgment

   Explanation: The update, query, and reply EIGRP packet types require reliable delivery.

6. Which destination MAC address is used when a multicast EIGRP packet is encapsulated into an Ethernet frame?
   •  01-00-5E-00-00-09
   •  01-00-5E-00-00-10
   •  01-00-5E-00-00-0A
   •  01-00-5E-00-00-0B

   Explanation: When an EIGRP multicast packet is encapsulated into an Ethernet frame, the destination MAC address is 01-00-5E-00-00-0A.

7. What is identified within the opcode of an EIGRP packet header?
   •  the EIGRP message type that is being sent or received from a neighbor
   •  the EIGRP autonomous system metrics
   •  the EIGRP hold timer agreed upon with a neighbor
   •  the EIGRP sum of delays from source to destination

   Explanation: The EIGRP packet header opcode is used to identify the EIGRP packet type: update (1), query (3), reply (4), and hello (5)​.

8. An administrator issues the router eigrp 100 command on a router. What is the number 100 used for?
   •  as the autonomous system number
   •  as the number of neighbors supported by this router
   •  as the length of time this router will wait to hear hello packets from a neighbor
   •  as the maximum bandwidth of the fastest interface on the router

   Explanation: The router eigrp 100 command uses the number as a process-id to keep track of the running instance of the EIGRP process, as several EIGRP processes can be run at the same time. This number is called autonomous system number.

9. Why would a network administrator use a wildcard mask in the network command when configuring a router to use EIGRP?
   •  to lower the router overhead
   •  to send a manual summarization
   •  to exclude some interfaces from the EIGRP process
   •  to subnet at the time of the configuration

   Explanation: The wilcard mask in the EIGRP network command is used to define precisely which network or subnets participate in the EIGRP process. Only interfaces that have addresses in a subnet included in a network command will participate in EIGRP.

10. What information does EIGRP maintain within the routing table?
    •  both successors and feasible successors
    •  only feasible successors
    •  adjacent neighbors
    •  all routes known to the router
    •  only successors
11. Which table is used by EIGRP to store all routes that are learned from EIGRP neighbors?
    •  the routing table
    •  the neighbor table
    •  the topology table
    •  the adjacency table

    Explanation: EIGRP routers maintain a topology table that includes entries for every destination that the router learns from directly connected EIGRP neighbors.

12. Which command or commands must be entered on a serial interface of a Cisco router to restore the bandwidth to the default value of that specific router interface?
    •  bandwidth 1500
    • shutdown
      no shutdown
    • copy running-config startup-config
      reload
    • no bandwidth

    Explanation: The command used to restore the default bandwidth on a serial interface of a Cisco router is no bandwidth. The default bandwidth on most, but not all, Cisco router serial interfaces is 1544 kb/s.

13. Which three metric weights are set to zero by default when costs in EIGRP are being calculated? (Choose three.)
    •  k1
    •  k2
    •  k3
    •  k4
    •  k5
    •  k6

    Explanation: By default, k1 and k3 are set to one and k2, k4, and k5 are set to zero during cost calculation by the EIGRP process. There is no k6 value.

14. A new network administrator has been asked to verify the metrics that are used by EIGRP on a Cisco device. Which two EIGRP metrics are measured by using static values on a Cisco device? (Choose two.)
    •  bandwidth
    •  load
    •  reliability
    •  delay
    •  MTU

    Explanation: Bandwidth and delay are static values that are not actually tracked by a device. Load and reliability are tracked dynamically by a device over a default period of time. MTU is not used for EIGRP metrics.

15. Refer to the exhibit. Which two networks contain feasible successors? (Choose two.)

    

    CCNA3 v6.0 Chapter 6 Exam 003

    •  192.168.71.0
    •  192.168.51.0
    •  10.44.100.252
    •  10.44.104.253
    •  10.44.101.252

    Explanation: Feasible successors are installed in the EIGRP routing table when the successor becomes unavailable. Feasible successors are backup routes that are have a metric higher than that of successors.

16. A network administrator wants to verify the default delay values for the interfaces on an EIGRP-enabled router. Which command will display these values?
    •  show ip protocols
    •  show running-config
    •  show interfaces
    •  show ip route

    Explanation: The show interfaces command is used to show the delay, in microseconds, of a specified interface. This command will also provide the default delay value or an administratively configured value. The show running-config command will only display an administratively configured value. The commands show ip route and show ip protocols will not provide the delay value of each interface.

17. Refer to the exhibit. R3 has two possible paths to the 172.16.99.0 network. What is the reported distance of the feasible successor route?

    

    CCNA3 v6.0 Chapter 6 Exam 002

    •  2340608
    •  2169856
    •  10512128
    •  2816

    Explanation: A feasible successor route is a backup route to the primary successor route, displayed as the second subentry in the command output. The reported distance of the feasible successor route for the 172.16.99.0 network is 2816.​

18. Refer to the exhibit. R2 has two possible paths to the 192.168.10.4 network. What would make the alternate route meet the feasibility condition?

    

    CCNA3 v6.0 Chapter 6 Exam 001

    •  a reported distance less than 3523840
    •  a reported distance greater than 41024000
    •  a feasible distance greater than 41024000
    •  an administrative distance less than 170

    Explanation: To meet the feasibility condition, the reported distance (RD) to a network must be less than the current feasible distance to the same destination network. In this example the current feasible distance is 3523840. This means that to be a feasible successor, a route would need a reported distance less than 3523840.

19. Which two factors does an EIGRP router use to determine that a route to a remote network meets the feasible condition and is therefore loop-free? (Choose two.)
    •  the successor route on a neighbor router
    •  the feasible successor route on the remote router
    •  the reported distance on a neighbor router
    •  the administrative distance on the remote router
    •  the feasible distance on the local router

    Explanation: The EIGRP feasible condition (FC) is met when the reported distance (RD) on a neighbor router to a network is less than the local router feasible distance (FD) to the same destination network.

20. Which configuration is necessary to ensure successful operation of EIGRP for IPv6?
    •  The eigrp router-id command requires an IPv6 address within the router configuration mode.​
    •  The network command is required within the router configuration mode.​
    •  The no shutdown command is required within the router configuration mode.​
    •  The router eigrp autonomous-system command is required within the router configuration mode.

    Explanation: By default, the EIGRP for IPv6 process is in a shutdown state. The EIGRP for IPv6 process must be activated by using the no shutdown command within router configuration mode.

21. Fill in the Blank. Use the abbreviation.
    EIGRP uses the protocol   RTP       to deliver EIGRP packets to neighbors.​

22. Fill in the blank.
    In an EIGRP topology table, a route that is in a/an     active                state will cause the Diffusing Update Algorithm to send EIGRP queries that ask other routers for a path to this network.

23. Order the precedence in which an EIGRP router would choose the router ID. (Not all options are used.)

    Explanation: EIGRP needs a router ID to uniquely identify routers in an EIGRP domain. A router will use any manually configured router ID first. If a router ID is not manually configured, the router will choose an ID based on the interface with the highest IPv4 address. Because loopback interfaces are more stable than physical interfaces, the highest IPv4 address on a loopback will be used as the router ID. If there is no loopback interface configured, then the highest IPv4 address on any physical interface will be used.

24. Match the correct version of EIGRP with the EIGRP features. (Not all options are used.)

    

    CCNA3 v6.0 Chapter 6 Exam 02

    Explanation: Most of the features for EIGRP are the same for both IPv4 and IPv6. The exceptions are source and destination addresses for protocol messages. EIGRP for IPv4 uses the routable address of the exit interface as the source and the all-EIGRP-routers IPv4 multicast address as the destination. EIGRP for IPv6 uses the link-local address of the exit interface as the source and the all-EIGRP-routers multicast address for the destination. Dijkstra’s algorithm is used for OSPF and DUAL is used for EIGRP.

25. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.

    Which code is displayed on the web server?

    •  Done
    •  EIGRP
    •  Complete
    •  IPv6EIGRP

    Explanation: To complete the activity: 1. Enable IPv6 routing globally on R2 using the ipv6 unicast-routing command 2. Configure IPv6 EIGRP on the router, assign the router IP, and enable it, using the following commands: ipv6 router eigrp 100 eigrp router-id 10.0.0.2 no shutdown 3. Configure the Gi0/0 and S0/0/0 interfaces with the ipv6 eigrp 100 command To test your configuration: On PC0, click on the Desktop tab, open the web browser, and type www.netacad.net

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2 New Questions Updated May 2018

1. What protocol is use by EIGRP to deliver EIGRP packets to neighbors?
   • DTP
   • UDP
   • TCP
   • RTP
     

     Explanation: Because EIGRP can route non-IP protocols it cannot use, TCP or UDP for reliable EIGRP packet delivery. Instead it uses Reliable Transport Protocol (RTP).

2. Which condition will cause DUAL to put an EIGRP route into the active state?
   • The successor is no longer available and there is no feasible successor.
   • The successor and feasible successor are both available.
   • The successor is no longer available but there is a feasible successor.
   • The successor is available but there is no feasible successor.
     

     Explanation: DUAL will put an EIGRP route into the active state if the successor becomes unavailable and there is no feasible successor in the topology table. When a network enters the active state, DUAL must query neighbors for a new successor.