CCNA 4 Routing & Switching Essentials Ver 6.0 – ITN Chapter 3 Exam Answers

CCNA 4 Routing & Switching Essentials Ver 6.0 – ITN Chapter 3 Exam Answers
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  1. What is used by BGP to determine the best path to a destination?

    cost
    administrative distance
    hop count
    attributes*

    [alert-success]BGP uses attributes, such as AS-path, to determine the best path to a destination.[/alert-success]

  2. What command specifies a BGP neighbor that has an IP address of 5.5.5.5/24 and that is in AS 500?

    (config-router)# neighbor 5.5.5.5 remote-as 500*
    (config-router)# network 5.0.0.0 0.0.0.255
    (config-router)# router bgp 500
    (config-router)# neighbor 500 remote-as 5.5.5.5

    [alert-success]The neighbor command is used to specify an EBGP neighbor router and peer with it. The command requires that the AS number of the neighbor be included as part of the command.[/alert-success]

  3. True or False?
    Multiple BGP processes can run on a router.

    true
    false*

    [alert-success]Because a BGP router can only belong to a single autonomous system, it can only run a single BGP process.[/alert-success]

  4. When PPPoE is configured on a customer router, which two commands must have the same value for the configuration to work?

    (Choose two.)

    dialer pool 2*
    interface dialer 2
    ppp chap password 2
    interface gigabitethernet 0/2
    pppoe-client dial-pool-number 2*
    ppp chap hostname 2

  5. Why is the MTU for a PPPoE DSL configuration reduced from 1500 bytes to 1492?

    to establish a secure tunnel with less overhead
    to enable CHAP authentication
    to accommodate the PPPoE headers*
    to reduce congestion on the DSL link

  6. What are two characteristics of a PPPoE configuration on a Cisco customer router?

    (Choose two.)

    The customer router CHAP username and password are independent of what is configured on the ISP router.
    An MTU size of 1492 bytes is configured on the Ethernet interface.
    The Ethernet interface does not have an IP address.*
    The PPP configuration is on the dialer interface.*
    The dialer pool command is applied to the Ethernet interface to link it to the dialer interface.

  7. Where is PPPoE configured on a Cisco router?

    on any physical interface
    on the dialer interface*
    on an Ethernet interface
    on a serial interface

  8. How can the use of VPNs in the workplace contribute to lower operating costs?

    High-speed broadband technology can be replaced with leased lines.
    VPNs can be used across broadband connections rather than dedicated WAN links.*
    VPNs prevents connectivity to SOHO users.
    VPNs require a subscription from a specific Internet service provider that specializes in secure connections.

  9. How is “tunneling” accomplished in a VPN?

    All packets between two hosts are assigned to a single physical medium to ensure that the packets are kept private.
    A dedicated circuit is established between the source and destination devices for the duration of the connection.
    Packets are disguised to look like other types of traffic so that they will be ignored by potential attackers.
    New headers from one or more VPN protocols encapsulate the original packets.*

  10. Which broadband wireless technology is based on the 802.11 standard?

    WiMAX
    UMTS
    municipal Wi-Fi*
    CDMA

  11. What is the approximate distance limitation for providing a satisfactory ADSL service from the central office to a customer?

    3.39 miles or 5.46 kilometers*
    2.11 miles or 3.39 kilometers
    11.18 miles or 18 kilometers
    6.21 miles or 10 kilometers

  12. What is a component of an ADSL connection that is located at the customer site?

    CO
    DSLAM
    CPE*
    SOHO

  13. What is the function of the DSLAM in a broadband DSL network?

    separates POTS traffic from ADSL traffic
    separates voice from data signals
    multiplexes individual customer DSL connections into a single upstream link*
    communicates directly with customer cable modems to provide Internet services to customers

  14. Which broadband technology would be best for a small office that requires fast upstream connections?

    fiber-to-the-home*
    WiMax
    DSL
    cable

  15. What are two WAN connection enhancements that are achieved by implementing PPPoE?

    (Choose two.)

    An Ethernet link supports a number of data link protocols.
    DSL CHAP features are included in PPPoE.
    Encapsulating Ethernet frames within PPP frames is an efficient use of bandwidth.
    CHAP enables customer authentication and accounting.*
    PPP enables the ISP to assign an IP address to the customer WAN interface.*

  16. Which two statements describe a remote access VPN?

    (Choose two.)

    It may require VPN client software on hosts.*
    It requires hosts to send TCP/IP traffic through a VPN gateway.
    It connects entire networks to each other.
    It is used to connect individual hosts securely to a company network over the Internet.*
    It requires static configuration of the VPN tunnel.

  17. Which is a requirement of a site-to-site VPN?

    It requires hosts to use VPN client software to encapsulate traffic.
    It requires the placement of a VPN server at the edge of the company network.
    It requires a client/server architecture.
    It requires a VPN gateway at each end of the tunnel to encrypt and decrypt traffic.*

  18. What functionality does mGRE provide to the DMVPN technology?

    It allows the creation of dynamically allocated tunnels through a permanent tunnel source at the hub and dynamically allocated tunnel destinations at the spokes.*
    It provides secure transport of private information over public networks, such as the Internet.
    It is a Cisco software solution for building multiple VPNs in an easy, dynamic, and scalable manner.
    It creates a distributed mapping database of public IP addresses for all VPN tunnel spokes.

  19. Which two scenarios are examples of remote access VPNs?

    (Choose two.)

    A toy manufacturer has a permanent VPN connection to one of its parts suppliers.
    All users at a large branch office can access company resources through a single VPN connection.
    A small branch office with three employees has a Cisco ASA that is used to create a VPN connection to the HQ.
    An employee who is working from home uses VPN client software on a laptop in order to connect to the company network.*
    A mobile sales agent is connecting to the company network via the Internet connection at a hotel.*

  20. The graphic shows two routers, R1 and R2, that connect to the Internet. There is a site attached to each router. Site A is attached to router R1 and site B is attached to router R2. A tunnel is shown spanning the Internet between the two routers.
    Refer to the exhibit. What solution can provide a VPN between site A and site B to support encapsulation of any Layer 3 protocol between the internal networks at each site?

    a remote access tunnel
    a GRE tunnel*
    an IPsec tunnel
    Cisco SSL VPN

  21. Which three statements are characteristics of generic routing encapsulation (GRE)?

    (Choose three.)

    GRE does not have strong security mechanisms.*
    The GRE header alone adds at least 24 bytes of overhead.
    GRE is stateless.*
    GRE encapsulation supports any OSI Layer 3 protocol.*
    GRE is the most secure tunneling protocol.
    GRE provides flow control by default.

  22. Refer to the exhibit. Which IP address is configured on the physical interface of the CORP router?


    10.1.1.1
    209.165.202.133*
    209.165.202.134
    10.1.1.2

  23. Refer to the exhibit. Which IP address would be configured on the tunnel interface of the destination router?

    209.165.200.226
    209.165.200.225
    172.16.1.1
    172.16.1.2*

  24. Refer to the exhibit. A tunnel was implemented between routers R1 and R2. Which two conclusions can be drawn from the R1 command output?

    (Choose two.)

    The data that is sent across this tunnel is not secure.*
    This tunnel mode is not the default tunnel interface mode for Cisco IOS software.
    This tunnel mode provides encryption.
    A GRE tunnel is being used.*
    This tunnel mode does not support IP multicast tunneling.

  25. On the left is a cloud with the following words: ISP 1 AS 64001 Company A 192.168.10.0/24. A router labeled R1 at the edge of this cloud connects through a serial interface labeled 209.165.200.225 to another router labeled R2. The serial interface on R2 is labeled 209.165.200.226. R2 is inside a second cloud labeled ISP 2 AS 650002 Company B 192.168.20.0/24. Refer to the exhibit. Which two configurations will allow router R1 to establish a neighbor relationship with router R2?

    (Choose two.)

    R1(config)# router bgp 65001
    R1(config-router)# network 192.168.20.0

    R2(config)# router bgp 65002
    R2(config-router)# network 192.168.10.0
    R2(config-router)# neighbor 209.165.200.226 remote-as 65002

    R2(config)# router bgp 65002
    R2(config-router)# network 192.168.20.0
    R2(config-router)# neighbor 209.165.200.225 remote-as 65001*

    R1(config)# router bgp 65002
    R1(config-router)# network 192.168.20.0
    R1(config-router)# neighbor 209.165.200.225 remote-as 65001

    R1(config)# router bgp 65001
    R1(config-router)# network 192.168.10.0
    R1(config-router)# neighbor 209.165.200.226 remote-as 65002*

    R2(config)# router bgp 65002
    R2(config-router)# network 192.168.10.0

    [alert-success]To configure EBGP, the router bgp command is followed by the AS number in which the router resides. Conversely, the neighbor command contains the AS number to which the remote router belongs.[/alert-success]

  26. Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.
    What is the code displayed on the web page?

    Welldone!
    BGP is configured!
    BGP is running!*
    Configuration is correct!

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