CCNA 4, Chapter 2 Exam

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Questions and Answers
  • 1. 

    Which command can be used to view the cable type that is attached to a serial interface?

    • A.

      Router(config)# show interfaces

    • B.

      Router(config)# show controllers

    • C.

      Router(config)# show ip interface

    • D.

      Router(config)# show ip interface brief

    Correct Answer
    B. Router(config)# show controllers
    Explanation
    The command "Router(config)# show controllers" can be used to view the cable type that is attached to a serial interface. This command provides detailed information about the hardware controllers on the router, including the type of cable connected to each interface.

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  • 2. 

    Which three are types of LCP frames used with PPP? (Choose three.)

    • A.

      link-negotiation frames

    • B.

      link-acknowledgment frames

    • C.

      link-maintenance frames

    • D.

      Link-termination frames

    • E.

      link-control frames

    • F.

      link-establishment frames

    Correct Answer(s)
    C. link-maintenance frames
    D. Link-termination frames
    F. link-establishment frames
    Explanation
    The three types of LCP frames used with PPP are link-maintenance frames, link-termination frames, and link-establishment frames. These frames are used to establish, maintain, and terminate the link between two PPP devices. Link-maintenance frames are used to keep the link active and ensure its proper functioning. Link-termination frames are used to gracefully terminate the link when it is no longer needed. Link-establishment frames are used to initiate the link and negotiate the parameters between the devices.

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  • 3. 

    How does PPP interface with different network layer protocols?

    • A.

      by using separate NCPs

    • B.

      by negotiating with the network layer handler

    • C.

      by encoding the information field in the PPP frame

    • D.

      by specifying the protocol during link establishment through LCP

    Correct Answer
    A. by using separate NCPs
    Explanation
    PPP interfaces with different network layer protocols by using separate NCPs. NCP stands for Network Control Protocol, which is responsible for establishing and configuring the network layer protocol over the PPP link. Each network layer protocol has its own NCP, which handles the negotiation and configuration of that specific protocol. This allows PPP to support multiple network layer protocols simultaneously, as each protocol can have its own NCP to handle its specific requirements.

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  • 4. 

    Which address is used in the Address field of a PPP frame?

    • A.

      A single byte of binary 00000000

    • B.

      a single byte of binary 10101010

    • C.

      a single byte of binary 11111111

    • D.

      the IP address of the serial interface

    Correct Answer
    C. a single byte of binary 11111111
    Explanation
    The address used in the Address field of a PPP frame is a single byte of binary 11111111. This address is known as the broadcast address, and it is used to send a frame to all devices on the network. Using this address ensures that the frame reaches every device connected to the PPP network.

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  • 5. 

    Which field marks the beginning and end of an HDLC frame?

    • A.

      Data

    • B.

      FCS

    • C.

      Control

    • D.

      Flag

    Correct Answer
    D. Flag
    Explanation
    The field that marks the beginning and end of an HDLC frame is the Flag. The Flag field is a unique bit pattern that is used to delimit the start and end of each frame in HDLC communication. It consists of six consecutive 1 bits followed by a 0 bit. The Flag field helps in synchronizing the sender and receiver, allowing them to identify the boundaries of each frame and ensuring reliable data transmission.

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  • 6. 

    In which situation would the use of PAP be preferable to the use of CHAP?

    • A.

      When router resources are limited

    • B.

      when multilink PPP is used

    • C.

      when plain text passwords are needed to simulate login at the remote host

    • D.

      When a network administrator prefers it because of ease of configuration

    Correct Answer
    C. when plain text passwords are needed to simulate login at the remote host
    Explanation
    PAP (Password Authentication Protocol) sends passwords in plain text, while CHAP (Challenge Handshake Authentication Protocol) uses a more secure method of authentication. However, in some situations where there is a need to simulate login at the remote host using plain text passwords, PAP would be preferable as it allows for this specific requirement.

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  • 7. 

    When configuring Multilink PPP, where is the IP address for the multilink bundle configured?

    • A.

      On a physical serial interface

    • B.

      on a subinterface

    • C.

      on a multilink interface

    • D.

      On a physical Ethernet interface

    Correct Answer
    C. on a multilink interface
    Explanation
    The IP address for the multilink bundle is configured on a multilink interface. Multilink PPP allows multiple physical links to be combined into a single logical link, providing increased bandwidth and redundancy. The multilink interface acts as the endpoint for the combined links and is where the IP address is assigned. This allows the multilink bundle to function as a single interface with its own IP address, enabling routing and communication over the combined links. Configuring the IP address on the multilink interface ensures that the bundle is properly identified and can participate in network communication.

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  • 8. 

    Refer to the exhibit. Based on the debug command output that is shown, which statement is true of the operation of PPP.

    • A.

      CHAP authentication failed because of an unknown hostname.

    • B.

      A PPP session was successfully established.

    • C.

      Both PAP and CHAP authentication were attempted.

    • D.

      The debug output is from router R2.

    Correct Answer
    B. A PPP session was successfully established.
    Explanation
    The given debug command output shows that a PPP session was successfully established. There is no indication of any authentication failure or attempts for both PAP and CHAP authentication. The debug output is specifically from router R2, which suggests that the PPP session on this particular router was successfully established.

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  • 9. 

    Refer to the exhibit. A network administrator is configuring the PPP link between the two routers. However, the PPP link cannot be established. Based on the partial output of the show running-config command, what is the cause of the problem?​

    • A.

      The usernames do not match.

    • B.

      The passwords do not match.

    • C.

      The passwords should be longer than 8 characters.

    • D.

      The interface IP addresses are in different subnets.

    Correct Answer
    B. The passwords do not match.
    Explanation
    Based on the partial output of the show running-config command, it can be inferred that the passwords configured on the two routers do not match. This is indicated by the presence of the "ppp authentication password" command with different passwords on each router. Since the passwords must match for the PPP link to be established, this is likely the cause of the problem.

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  • 10. 

    Which is an advantage of using PPP on a serial link instead of HDLC?

    • A.

      Option for authentication

    • B.

      higher speed transmission

    • C.

      fixed-size frames

    • D.

      option for session establishment

    Correct Answer
    A. Option for authentication
    Explanation
    PPP (Point-to-Point Protocol) offers the advantage of providing an option for authentication on a serial link. This means that PPP allows the verification of the identity of the devices communicating over the link, ensuring secure and authorized access. HDLC (High-Level Data Link Control) does not have this feature, making it less secure in terms of verifying the authenticity of the devices. Therefore, the option for authentication is an advantage of using PPP over HDLC on a serial link.

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  • 11. 

    Which protocol will terminate the PPP link after the exchange of data is complete?

    • A.

      NCP

    • B.

      LCP

    • C.

      IPCP

    • D.

      IPXCP

    Correct Answer
    B. LCP
    Explanation
    LCP (Link Control Protocol) is responsible for establishing, configuring, and terminating the PPP (Point-to-Point Protocol) link between two devices. It manages the link and ensures that it is functioning properly. Once the exchange of data is complete, LCP will terminate the PPP link, closing the connection between the devices. NCP (Network Control Protocol) is responsible for establishing and configuring network-layer protocols, such as IP (Internet Protocol) or IPX (Internetwork Packet Exchange). IPCP (Internet Protocol Control Protocol) is a specific NCP used for IP, while IPXCP is used for IPX. However, neither NCP nor its specific implementations are responsible for terminating the PPP link.

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  • 12. 

    Which serial 0/0/0 interface state will be shown if no serial cable is attached to the router, but everything else has been correctly configured and turned on?

    • A.

      Serial 0/0/0 is up, line protocol is up

    • B.

      Serial 0/0/0 is up, line protocol is down

    • C.

      Serial 0/0/0 is down, line protocol is down

    • D.

      Serial 0/0/0 is up (looped)

    • E.

      Serial 0/0/0 is up (disabled)

    • F.

      Serial 0/0/0 is administratively down, line protocol is down

    Correct Answer
    C. Serial 0/0/0 is down, line protocol is down
    Explanation
    If no serial cable is attached to the router, the interface will be in the "down" state. The "line protocol" refers to the status of the data link layer protocol, which is responsible for establishing and maintaining a link between devices. Since no cable is connected, the line protocol will also be in the "down" state. Therefore, the correct answer is "Serial 0/0/0 is down, line protocol is down."

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  • 13. 

    How much total bandwidth is provided by a T1 line?

    • A.

      1.544 Mb/s

    • B.

      64 kb/s

    • C.

      128 b/s

    • D.

      43.736 Mb/s

    Correct Answer
    A. 1.544 Mb/s
    Explanation
    A T1 line provides a total bandwidth of 1.544 Mb/s.

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  • 14. 

    A network engineer is monitoring an essential, but poor quality, PPP WAN link that periodically shuts down. An examination of the interface configurations shows that the ppp quality 90 command has been issued. What action could the engineer take to reduce the frequency with which the link shuts down?

    • A.

      Issue the command ppp quality 70.

    • B.

      Issue the command ppp quality 100.

    • C.

      Set the DCE interface to a lower clock rate.

    • D.

      Use the bandwidth command to increase the bandwidth of the link.

    Correct Answer
    A. Issue the command ppp quality 70.
    Explanation
    The correct answer is to issue the command "ppp quality 70". This command will lower the acceptable quality threshold for the PPP link, allowing for a higher tolerance of poor quality. By setting the threshold to 70, the link will be less likely to shut down when experiencing occasional drops in quality.

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  • 15. 

    A network engineer is troubleshooting the loss of MPEG video viewing quality as MPEG video files cross a PPP WAN link. What could be causing this loss of quality?

    • A.

      PAP authentication was misconfigured on the link interfaces.

    • B.

      The clock rates configured on each serial interface do not match.

    • C.

      Link Quality Monitoring was not configured correctly on each interface.

    • D.

      The compress command was used when PPP was configured on the interfaces.

    Correct Answer
    D. The compress command was used when PPP was configured on the interfaces.
    Explanation
    The compress command was used when PPP was configured on the interfaces. This command enables data compression on the PPP link, which can cause loss of quality for MPEG video files. Data compression algorithms may remove or alter certain data in order to reduce the size of the file, resulting in a loss of video quality.

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  • 16. 

    Which PPP option can detect links that are in a looped-back condition?

    • A.

      Magic Number

    • B.

      MRU

    • C.

      Callback

    • D.

      ACCM

    Correct Answer
    A. Magic Number
    Explanation
    The Magic Number option in PPP can detect links that are in a looped-back condition. This option allows the sender to include a unique number in each PPP frame, and the receiver can check if the received number matches the expected number. If there is a looped-back condition, the received number will not match the expected number, indicating a problem in the link. This helps in detecting and resolving looped-back conditions in PPP connections.

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  • 17. 

    A network engineer has issued the show interfaces serial 0/0/0 command on a router to examine the open NCPs on a PPP link to another router. The command output displays that the encapsulation is PPP and that the LCP is open. However, the IPV6CP NCP is not shown as open. What does the engineer need to configure to open the IPV6CP NCP on the link?

    • A.

      Configure CHAP authentication on each router.

    • B.

      Configure PPP multilink interfaces on each router.

    • C.

      Configure an IPv6 address on each interface on the link.

    • D.

      Issue the compress predictor command on each interface on the link.

    Correct Answer
    C. Configure an IPv6 address on each interface on the link.
    Explanation
    To open the IPV6CP NCP on the link, the network engineer needs to configure an IPv6 address on each interface on the link. This is because the IPV6CP NCP is responsible for negotiating and establishing IPv6 addresses on the PPP link. By configuring an IPv6 address on each interface, the engineer enables the negotiation process for the IPV6CP NCP, allowing it to be shown as open in the command output of the show interfaces serial 0/0/0 command.

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  • 18. 

    ******** Which three physical layer interfaces support PPP? (Choose three.) ********

    • A.

      FastEthernet

    • B.

      GigabitEthernet

    • C.

      Ethernet

    • D.

      Synchronous serial

    • E.

      HSSI

    • F.

      Asynchronous serial

    Correct Answer(s)
    D. Synchronous serial
    E. HSSI
    F. Asynchronous serial
    Explanation
    The three physical layer interfaces that support PPP are synchronous serial, HSSI, and asynchronous serial. PPP (Point-to-Point Protocol) is a data link protocol commonly used for establishing a direct connection between two nodes. Synchronous serial, HSSI (High-Speed Serial Interface), and asynchronous serial are all types of physical interfaces that can be used to establish this connection and support PPP. FastEthernet, GigabitEthernet, and Ethernet are not physical layer interfaces that support PPP.

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  • 19. 

    What are three components of PPP? (Choose three.)

    • A.

      Authorization

    • B.

      LCP

    • C.

      Parallel communications

    • D.

      NCP

    • E.

      Support for LAN and WAN

    • F.

      HDLC-like framing

    Correct Answer(s)
    B. LCP
    D. NCP
    F. HDLC-like framing
    Explanation
    PPP (Point-to-Point Protocol) is a data link protocol commonly used in establishing internet connections. The three components of PPP mentioned in the answer are LCP (Link Control Protocol), NCP (Network Control Protocol), and HDLC-like framing. LCP is responsible for establishing, configuring, and terminating the link between two devices. NCP is used for establishing and configuring different network layer protocols, such as IP or IPX. HDLC-like framing refers to the encapsulation of data in a frame format similar to HDLC (High-Level Data Link Control) protocol. These components collectively enable PPP to provide authentication, encryption, error detection, and other functionalities in point-to-point communication.

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  • 20. 

    Refer to the exhibit. What type of Layer 2 encapsulation will be used for connection D on the basis of this configuration on a newly installed router:RtrA(config)# interface serial0/0/0 RtrA(config-if)# ip address 128.107.0.2 255.255.255.252 RtrA(config-if)# no shutdown

    • A.

      Ethernet

    • B.

      Frame Relay

    • C.

      HDLC

    • D.

      PPP

    Correct Answer
    C. HDLC
    Explanation
    Based on the given configuration, the Layer 2 encapsulation used for connection D would be HDLC. This is because HDLC (High-Level Data Link Control) is a synchronous data link layer protocol that is commonly used for point-to-point serial connections. The configuration provided does not mention any specific Layer 2 encapsulation protocol, so the default protocol used by Cisco routers is HDLC. Therefore, HDLC would be the correct answer in this case.

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  • 21. 

    Which two statements describe a PPP connection between two Cisco routers? (Choose two.)

    • A.

      LCP tests the quality of the link.

    • B.

      LCP manages compression on the link.

    • C.

      Only a single NCP is allowed between the two routers.

    • D.

      NCP terminates the link when data exchange is complete.

    • E.

      With CHAP authentication, the routers exchange plain text passwords.

    Correct Answer(s)
    A. LCP tests the quality of the link.
    B. LCP manages compression on the link.
    Explanation
    LCP (Link Control Protocol) is responsible for establishing, configuring, and testing the link between two Cisco routers in a PPP connection. It performs quality testing to ensure the link is stable and reliable. Additionally, LCP manages compression on the link, allowing for efficient data transmission by compressing the data before sending it over the link. Therefore, the two statements that accurately describe a PPP connection between two Cisco routers are that LCP tests the quality of the link and LCP manages compression on the link.

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  • 22. 

    Open the PT Activity. Perform the tasks in the activity instructions and then answer the question.Why is the serial link between router R1 and router R2 not operational?

    • A.

      In each case the expected username is not the same as the remote router hostname.

    • B.

      The passwords are different in both routers.

    • C.

      The encapsulation in both routers does not match.

    • D.

      The authentication type is not the same in both routers.

    Correct Answer
    A. In each case the expected username is not the same as the remote router hostname.
    Explanation
    The serial link between router R1 and router R2 is not operational because in each case the expected username is not the same as the remote router hostname. This means that the authentication process is failing, as the routers are expecting a different username than what is being provided. Therefore, the connection cannot be established.

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