CCNA 3 v6.0 Chapter 7 Exam Answers 2018

CCNA 3 v6.0 Chapter 7 Exam Answers

  1. What is the purpose of a Null0 route in the routing table?to prevent routing loops*to redistribute external routes into EIGRPto act as a gateway of last resortto prevent the router from sending EIGRP packets
  2. Refer to the exhibit. Routers R1 and R2 are directly connected via their serial interfaces and are both running the EIGRP routing protocol. R1 and R2 can ping the directly connected serial interface of their neighbor, but they cannot form an EIGRP neighbor adjacency. What action should be taken to solve this problem?Configure EIGRP to send periodic updates.Enable the serial interfaces of both routers.Configure the same hello interval between the routers.Configure both routers with the same EIGRP autonomous system number.*

    In EIGRP configuration, the command that starts the EIGRP process is followed by a number that is the autonomous system (AS) number, router eigrp as-number. The as-number must be the same in all routers that are in the same EIGRP routing domain. In this case R2 is configured with AS 80 and R1 is configured with AS 50.

     

  3. In which scenario will the use of EIGRP automatic summarization cause inconsistent routing in a network?when the routers in an IPv4 network have mismatching EIGRP AS numberswhen the routers in an IPv4 network are connected to discontiguous networks with automatic summarization enabled*when there is no adjacency that is established between neighboring routerswhen there is no common subnet that exists between neighboring routers
  4. Fill in the blank. Do not use abbreviations.
    The _____________ command causes an EIGRP router to stop sending hello packets through an interface.
    Correct Answer: passive-interface*

    The passive-interface command prevents routing updates and hello packets from traveling through an interface.

  5. Refer to the exhibit. After the configuration shown is applied on router R1, the exhibited status message is displayed. Router R1 is unable to form a neighbor relationship with R2 on the serial 0/1/0 interface. What is the most likely cause of this problem?The network statement used for EIGRP 55 does not enable EIGRP on interface serial 0/1/0.The hello interval has been altered on serial 0/1/0 and is preventing a neighbor relationship from forming.The IPv4 address configured on the neighbor that is connected to R1 serial 0/1/0 is incorrect.*The networks that are configured on serial 0/0/0 and serial 0/1/0 of router R1 are overlapping.

    The passive-interface command should have been issued on serial 0/1/0.

  6. By default, how many equal-cost routes to the same destination network will EIGRP install in the routing table?24*68

    For load balancing, EIGRP will by default install up to four equal-cost paths to the same destination network in the routing table.

     

  7. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question. R1 and R2 could not establish an EIGRP adjacency. What is the problem?EIGRP is down on R2.R1 Fa0/0 link local address is wrong.EIGRP is down on R1.*R1 Fa0/0 is not configured to send hello packets.R1 Fa0/0 and R2 Fa0/0 are on different networks.

    The IPv6 EIGRP process is down on R1 as can be seen:

    R1# show ipv6 eigrp interfaces
    IPv6-EIGRP interfaces for process 1
    % EIGRP 1 is in SHUTDOWN
    R1#

    The administrator must issue the no shutdown command on the IPv6 router configuration mode.

  8. Refer to the exhibit. All networks are active in the same EIGRP routing domain. When the auto-summary command is issued on R3, which two summary networks will be calculated on R3? (Choose two.)172.16.0.0/16*172.16.3.0/24192.168.1.0/30192.168.10.0/30

    192.168.10.0/24*

    As a result of implementing EIGRP automatic summarization, router R3 uses a classful network addressing scheme to group networks together based on their classful network mask. 192.168.10.4/30 and 192.168.10.8/30 are shortened to 192.168.10.0/24 and 172.16.3.0/24 is summarized to 172.16.0.0/16. 192.168.1.0/24 is already using its classful mask and is not summarized.

     

  9. Which routing protocol supports unequal-cost load balancing on Cisco routers?OSPFIS-ISRIPv2EIGRP*

    EIGRP is unique because of its support of unequal-cost load balancing.

  10. Which three statements are advantages of using automatic summarization? (Choose three.)It maximizes the number of routes in the routing table.It decreases the number of entries in the routing table.*It reduces the frequency of routing updates.*It ensures that traffic for multiple subnets uses one path through the internetwork.*

    It improves reachability in discontiguous networks.

    It increases the size of routing updates.

    Automatic summarization minimizes the number of routes in the routing table.

    It reduces the frequency of routing updates.

    A disadvantage of automatic summarization is that it can create reachability problems in discontiguous networks.

  11. Refer to the exhibit. Which two conclusions can be drawn from the exhibited configuration? (Choose two.)The configuration supports unequal-cost load balancing.*The configuration supports equal-cost load balancing.Any EIGRP-learned route with a metric less than 3 times the successor metric will be installed in the local routing table.*Any EIGRP-learned route with a metric equal to 3 times the successor metric will be installed in the local routing table.

    The network statements require subnet masks to prevent autosummarization.

    The configuration supports unequal-cost load balancing as shown by the variance value of 3. The default variance for EIGRP is 1. The no auto-summary command is needed to prevent autosummarization.

  12. What is the administrative distance of externally learned EIGRP routes?170*12011090
  13. Refer to the exhibit. Which two routes will be advertised to the router ISP if autosummarization is disabled? (Choose two.)10.1.2.0/24*10.1.0.0/1610.1.4.0/2810.1.4.0/30*10.1.4.0/24

    If the no auto-summary command was issued disabling the autosummarization, all subnetworks will be advertised, without summarization.

  14. Which two steps must be taken in order to send a default route to other EIGRP routers? (Choose two.)Configure a loopback address.Configure a default route.*Configure a router ID.Ensure automatic summarization is disabled.

    Redistribute the default route.*

  15. Refer to the exhibit. Remote users are experiencing connectivity problems when attempting to reach hosts in the 172.21.100.0 /24 network. Using the output in the exhibit, what is the most likely cause of the connectivity problem?The hello timer has been modified on interface GigabitEthernet 0/1 of R3 and not on the neighbor, causing a neighbor
    adjacency not to form.
    The GigabitEthernet interfaces are not limiting the flow of EIGRP message information and are being flooded with EIGRP traffic.The passive-interface command is preventing neighbor relationships on interface GigabitEthernet 0/0.The GigabitEthernet 0/1 interface is not participating in the EIGRP process.*

    When enabling EIGRP, the network command must be applied to the classful network address of the interface or to a subnet with the appropriate wildcard mask.

    The network 172.20.0.0 will only activate interfaces in that network.

    The wildcard mask 0.1.255.255 must be issued to support both 172.20.0.0 and 172.21.0.0 in a single network statement.

  16. Refer to the exhibit. An administrator wants EIGRP on Router1 to load balance traffic to network 2001:db8:11:10::/64 across two interfaces. Currently traffic is using only interface GigabitEthernet0/1. A second route, not in the routing table, is available with a metric of 264000. What value is needed in the variance command to make EIGRP put the second route into the routing table?410111*

    A variance of 11 is needed to load balance across the second route.

    The metric of the existing successor route is 25000.

    The metric of the second route is 264000.

    The first metric needs to be multiplied by 11, which is 275000, in order for the route to be put into the routing table.

     

  17. Which command can be issued on a router to verify that automatic summarization is enabled?show ip protocols*show ip eigrp neighborsshow ip eigrp interfacesshow ip interface brief
  18. Refer to the exhibit. Considering that R2, R3, and R4 are correctly configured, why did R1 not establish an adjacency with R2, R3, and R4?because the Fa0/0 interface of R1 is declared as passive for EIGRP*because there is no network command for the network 192.168.1.0/24 on R1because the IPv4 address on Fa0/0 interface of R1 is incorrectbecause the automatic summarization is enabled on R1
  19. When a Cisco router is configured with fast-switching, how are packets distributed over equal-cost paths?on a per-packet basison a per-interface basison a per-path-load basison a per-destination basis*

    In Cisco IOS, when packets are fast-switched, load balancing over equal-cost paths occurs on a per-destination basis.

  20. What is the default maximum amount of bandwidth that can be used for exchanging EIGRP messages on an EIGRP-configured interface?50%*10%100%75%
  21. Fill in the blank. Do not use abbreviations.The command to propagate the default route from the router Border to the rest of the EIGRP domain is Border(config-router)# _________
    Correct Answer: redistribute static*

    One way to propagate the default route to the rest of the EIGRP domain is to use the command redistribute static in the router eigrp (config-router)# mode.

  22. Refer to the exhibit. Which statement is supported by the output?A default route is being learned through an external process.*The route to 192.168.1.1 represents the configuration of a loopback interface.A static default route has been manually configured on this router.Summarization of routes has been manually configured.
  23. Refer to the exhibit. Router R3 is receiving multiple routes through the EIGRP routing protocol. Which statement is true about the implementation of summarization in this network?
    Automatic summarization has been enabled only for the 172.21.100.0/24 network.Automatic summarization is disabled on R3.*Automatic summarization is enabled on neighboring routers.Automatic summarization is disabled on a per-interface basis.

    Automatic summarization is disabled on R3, so no routes to the null0 interface have been created for networks 172.21.0.0/16 and 192168.254.0/24.

    If automatic summarization had been enabled on R3 neighbors, the networks that were received by R3 would have been summarized classful statements.

  24. Assuming that EIGRP is enabled on both routers and automatic summarization is enabled, what must be configured to ensure that R1 will be able to reach the 2.2.2.0/24 network?Use the command ip address-summary to ensure that R1 recognizes the 2.2.2.0 network.Use the command no auto-summary to disable automatic summarization.*EIGRP does not support VLSM and therefore cannot be used with discontiguous networks.EIGRP supports VLSM and will automatically recognize the 2.2.2.0 network.

    The networks 2.1.1.0/24 and 2.2.2.0/24 are two subnets of the Class A network 2.0.0.0/8. When automatic summarization is enabled, EIGRP will summarize and advertise networks at the major network boundary. In this case, both routers will advertise the network 2.0.0.0/8, which will cause failure of connectivity.

  25. Two routers, R1 and R2, share a 64 kb/s link. An administrator wants to limit the bandwidth used by EIGRP between these two routers to 48 kb/s. Which command is used on both routers to configure the new bandwidth setting?ip bandwidth-percent eigrp 64 48ip bandwidth-percent eigrp 75 100ip bandwidth-percent eigrp 100 75*ip bandwidth-percent eigrp 100 48ip bandwidth-percent eigrp 100 64

    If two routers share a link of 64 kb/s and the administrator wants to limit the bandwidth used by EIGRP between these two routers to 48 kb/s, then this value corresponds to 75% of the link bandwidth. So, the command to be issued on both routers is ip bandwidth-percent eigrp 100 75.

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