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CCNA Exploration 4

By Melanie Thomas,2014-06-17 08:14
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CCNA Exploration 4 ...

CCNA Exploration 4.0: Routing Protocols and Concepts - Chapter 1 Exam Answers

    1. If a router cannot find a valid configuration file during the startup sequence, what will occur?

    The startup sequence will reset.

    *The router will prompt the user for a response to enter setup mode.

    The startup sequence will halt until a valid configuration file is acquired. The router will generate a default configuration file based on the last valid configuration. The router will monitor local traffic to determine routing protocol configuration requirements.

    2.

    Refer to the exhibit. The network administrator has configured the router with the interface IP addresses shown for the directly connected networks. Pings from the router to hosts on the connected networks or pings between router interfaces are not working. What is the most likely problem?

    The destination networks do not exist.

    The IP addresses on the router interfaces must be configured as network addresses and not host addresses.

    * The interfaces must be enabled with the no shutdown command.

    Each interface must be configured with the clock rate command.

    3.

    Refer to the exhibit. What can be concluded from the routing table output in the exhibit? (Choose two.)

    This router only has two interfaces.

    The router interfaces are not operational yet.

    This router is configured to forward packets to remote networks.

    * The FastEthernet0/0 and Serial0/0/0 interfaces of this router were configured with an IP address and the no shutdown command.

    * An IP packet received by this router with a destination address of 198.18.9.1 will be forwarded out of the Serial0/0/0 interface.

    4.

    Refer to the exhibit. The frame shown in the exhibit was received by the router. The router interfaces are operational. How will the router process this frame? (Choose two.)

    The router will change the source and destination IP address in the packet before forwarding the frame.

    * The router will change the frame type to one supported by the WAN link before forwarding the frame.

    The router will use the destination MAC address to determine which interface to forward the packet.

    The router will look up the MAC address of the S0/0/0 interface in the ARP table and add it to the frame before forwarding.

    * The frame was received on the Fa0/0 interface of the router and will be switched to the S0/0/0 interface.

    The frame was received on the S0/0/0 interface of the router and will be switched to the Fa0/0 interface.

    5. Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and interfaces that can be protected with passwords. (Choose three.) * VTY interface

    * console interface

    Ethernet interface

    secret EXEC mode

    * privileged EXEC mode

    router configuration mode

    6. Which two statements correctly describe the components of a router? (Choose two.)

    RAM permanently stores the configuration file used during the boot sequence. * ROM contains diagnostics executed on hardware modules.

    NVRAM stores a backup copy of the IOS used during the boot sequence. * Flash memory does not lose its contents during a reboot.

    ROM contains the most current and most complete version of the IOS. Flash contains boot system commands to identify the location of the IOS 7.

    Refer to the exhibit. After host 2 is connected to the switch on the LAN, host 2 is unable to communicate with host 1. What is the cause of this problem?

The subnet mask of host 2 is incorrect.

    * Host 1 and host 2 are on different networks.

    The switch needs an IP address that is not configured.

    The router LAN interface and host 1 are on different networks. The IP address of host 1 is on a different network than is the LAN interface of the router. 8. Which are functions of a router? (Choose three.)

    * packet switching

    extension of network segments

    * segmentation of broadcast domains

    * selection of best path based on logical addressing

    election of best path based on physical addressing

    9.

    Refer to the exhibit. All routers have a route in its routing table to each network that is shown in the exhibit. Default routes have not been issued on these routers. What can be concluded about how packets are forwarded in this network? (Choose two.)

    If RouterC receives a packet that is destined for 10.5.1.1, it will be forwarded out interface Fa0/0.

    * If RouterA receives a packet that is destined for 192.168.3.146, it will be forwarded out interface S0/0/1.

    * If RouterB receives a packet that is destined for 10.5.27.15, it will be forwarded out interface S0/0/1.

    If RouterB receives a packet that is destined for 172.20.255.1, it will be forwarded out interface S0/0/0.

    If RouterC receives a packet that is destined for 192.16.5.101, it will be forwarded out interface S0/0/1.

    10.

    The serial connection shown in the graphic needs to be configured. Which configuration commands must be made on the Sydney router to establish connectivity with the Melbourne site? (Choose three.)

    * Sydney(config-if)# ip address 201.100.53.2 255.255.255.0

    * Sydney(config-if)# no shutdown

    Sydney(config-if)# ip address 201.100.53.1 255.255.255.224

    * Sydney(config-if)# clock rate 56000

    Sydney(config-if)# ip host Melbourne 201.100.53.2

    11.

    Refer to the exhibit. What can be concluded from the output of the running-configuration of a router?

    The passwords are encrypted.

    The current configuration was saved to NVRAM.

    The configuration that is shown will be the one used on the next reboot. * The commands that are displayed determine the current operation of the router.

12.

    Refer to the exhibit. Host A pings host B. When R4 accepts the ping into the Ethernet interface, what two pieces of header information are included? (Choose two.) source IP address: 192.168.10.129

    source IP address: BBBB.3333.5677

    destination IP address: 192.168.10.33

    * destination IP address: 192.168.10.134

    * destination MAC address: 9999.DADC.1234

    13. What is the outcome of entering these commands?

    R1(config)# line vty 0 4

    R1(config-line)# password check123

    R1(config-line)# login

    ensures that a password is entered before entering user EXEC mode * sets the password to be used for connecting to this router via Telnet requires check123 to be entered before the configuration can be saved creates a local user account for logging in to a router or switch 14. Which of the following is the correct flow of routines for a router startup? * load bootstrap, load IOS, apply configuration

    load bootstrap, apply configuration, load IOS

    load IOS, load bootstrap, apply configuration, check hardware

    check hardware, apply configuration, load bootstrap, load IOS

    15. What three processes does a router execute when it receives a packet from one network that is destined for another network? (Choose three.)

    * decapsulates the Layer 3 packet by stripping off the Layer 2 frame header uses the destination MAC Address in the IP Header to look up the next-hop address in the routing table

    leaves the Layer 2 frame header intact when decapsulating the Layer 3 packet * uses the destination IP Address in the IP header to look up the next-hop address in the routing table

    * encapsulates the Layer 3 packet into the new Layer 2 frame and forwards it out the exit interface

    encapsulates the Layer 3 packet into a special Layer 1 frame and forwards it to the exit interface

    16. The network administrator needs to connect two routers directly via their FastEthernet ports. What cable should the network administrator use? straight-through

    rollover

    * cross-over

    serial

    17. Which two statements describe characteristics of load balancing? (Choose two.) Load balancing occurs when a router sends the same packet to different destination networks. Load balancing occurs when a router sends the same packet to different destination networks.

    * Load balancing allows a router to forward packets over multiple paths to the same destination network.

    * Unequal cost load balancing is supported by EIGRP.

    If multiple paths with different metrics to a destinations exist, the router cannot support load balancing.

    18. What information about the router and its startup process can be gathered from the output of the show version command? (Choose three.)

* the last restart method

    the command buffer contents

    the amount of NVRAM and FLASH used

    * the configuration register settings

    * the location from where the IOS loaded

19.

Which interfaces in the exhibit could be used for a leased line WAN connection? (Choose

    two.)

* 1

    2

    3

    * 4

    5

    6

    20. From what location can a router load the Cisco IOS during the boot process? (Choose

    two.)

    RAM

    * TFTP server

    NVRAM

    setup routine

    * Flash memory

    terminal

    21. A network administrator has just entered new configurations into Router1. Which

    command should be executed to save configuration changes to NVRAM?

Router1# copy running-config flash

    Router1(config)# copy running-config flash

    Router1# copy running-config startup-config

    * Router1(config)# copy running-config startup-config

    Router1# copy startup-config running-config

    Router1(config)# copy startup-config running-config

    22. What is the default sequence for loading the configuration file?

NVRAM, FLASH, ROM

    FLASH, TFTP,CONSOLE

    * NVRAM, TFTP, CONSOLE

    FLASH, TFTP, ROM

    23. What header address information does a router change in the information it receives

    from an attached Ethernet interface before information is transmitted out another

    interface?

    only the Layer 2 source address

    only the Layer 2 destination address

    only the Layer 3 source address

only the Layer 3 destination address

    * the Layer 2 source and destination address

    the Layer 3 source and destination address

Chapter 2

    1 A static route that points to the next hop IP will have what administrative distance and metric in the routing table?

administrative distance of 0 and metric of 0

    administrative distance of 0 and metric of 1

    * administrative distance of 1 and metric of 0

    administrative distance of 1 and metric of 1

    2 What address can be used to summarize networks 172.16.1.0/24, 172.16.2.0/24, 172.16.3.0/24, and 172.16.4.0/24?

* 172.16.0.0/21

    172.16.1.0/22

    172.16.0.0 255.255.255.248

    172.16.0.0 255.255.252.0

3

    The routers in the diagram use the subnet assignments shown. What is the most efficient route summary that can be configured on Router3 to advertise the internal networks to the cloud?

192.1.1.0/26 and 192.1.1.64/27

    192.1.1.128/25

    192.1.1.0/23 and 192.1.1.64/23

    192.1.1.0/24

    * 192.1.1.0/25

    192.1.1.0/24 and 192.1.1.64/24

4

    Refer to the exhibit. What is the significance of the /8 in the route to the 10.0.0.0 network?

    It indicates that there are 8 hops between this router and the 10.0.0.0 network. It represents the time, in milliseconds, it takes for a ping to reply when sent to the 10.0.0.0 network.

    It indicates that there are 8 subnets in the destination network to which the router can forward packets.

    * It indicates the number of consecutive bits, from the left, in the destination IP address

of a packet that must match 10.0.0.0 to use that route.

5

    Refer to the exhibit. How will packets destined to the 172.16.0.0 network be forwarded?

* Router1 will perform recursive lookup and packet will exit S0/0.

    Router1 will perform recursive lookup and packet will exit S0/1.

    There is no matching interface associated with network 172.16.0.0 so packets will be dropped.

    There is no matching interface associated with network 172.16.0.0 so packets will take gateway of last resort and exit out S0/2.

    6 A network administrator enters the following command into Router1: ip route 192.168.0.0 255.255.255.0 S0/1/0. Router1 then receives a packet that is destined for 192.168.0.22/24. After finding the recently configured static route in the routing table, what does Router1 do next to process the packet?

    drops the packet because the destination host is not listed in the routing table looks up the MAC address of the S0/1/0 interface to determine the destination MAC address of the new frame

    performs a recursive lookup for the IP address of the S0/1/0 interface before forwarding the packet

    * encapsulates the packet into a frame for the WAN link and forwards the packet out the S0/1/0 interface

7

    Refer to the exhibit. Given the output in the exhibit, how would a clock rate be determined for this link?

The rate would be negotiated by both routers.

    A rate would not be selected due to the DCE/DTE connection mismatch. The rate configured on the DTE determines the clock rate.

    * The rate configured on the DCE determines the clock rate.

8

    Refer to the exhibit. Which set of commands will configure static routes that will allow the WinterPark and the Altamonte routers to deliver packets from each LAN and direct all other traffic to the Internet?

* WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1

    Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2

    Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/1

    WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1

    Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2

    Altamonte(config)# ip route 198.18.222.0 255.255.255.255 s0/1

    WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1 WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1

    Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2 WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1 Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2 Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/0

    9 Hosts on two separate subnets cannot communicate. The network administrator suspects a missing route in one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity issues? (Choose three.)

* ping

    show arp

    * traceroute

    * show ip route

    show interface

    show cdp neighbor detail

10

    Refer to the exhibit. A company network engineer is assigned to establish connectivity between the two Ethernet networks so that hosts on the 10.1.1.0/24 subnet can contact hosts on the 10.1.2.0/24 subnet. The engineer has been told to use only static routing for these company routers. Which set of commands will establish connectivity between the two Ethernet networks?

R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1

    R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2

    R1(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2

    R2(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1

    * R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2

    R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1

    R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.1

    R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.2

    R1(config)# ip route 0.0.0.0 0.0.0.0 10.1.2.1

    R2(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1

    11 Which of the following are displayed by the Router# show cdp neighbors command? (Choose three.)

load

    * platform

    reliability

    * holdtime

    * local interface

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