A Quiz On CCNA WAN Chapter 3

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A Quiz On CCNA WAN Chapter 3 - Quiz

Once again, we are back with another chapter of your studies on wide area networks, where today we’ll be looking at the third instalment of information regarding the topic. Think you know all there is to know about WANs already? Take the quiz and we’ll be the judges of that!


Questions and Answers
  • 1. 

    Refer to the exhibit. Router R1 has been configured for Frame Relay connectivity to routers R2 and R3. Which set of configuration options for routers R2 and R3 would provide each router connectivity to R1?

    • A.

      R2(config)# interface serial0/0/1 R2(config-if)# frame-relay map ip 10.1.1.1 102 R3(config)# interface serial0/0/1 R3(config-if)# frame-relay map ip 10.1.2.1 103

    • B.

      R2(config)# interface serial0/0/1 R2(config-if)# frame-relay map ip 10.1.1.1 102 R2(config-if)# frame-relay map ip 10.1.2.3 301 R3(config)# interface serial0/0/1 R3(config-if)# frame-relay map ip 10.1.2.1 103 R3(config-if)# frame-relay map ip 10.1.1.2 201

    • C.

      R2(config)# interface serial0/0/1 R2(config-if)# frame-relay map ip 10.1.1.1 102 R2(config-if)# frame-relay map ip 10.1.2.3 301 R3(config)# interface serial0/0/1 R3(config-if)# frame-relay map ip 10.1.2.1 103 R3(config-if)# frame-relay map ip 10.1.1.2 201

    • D.

      R2(config)# interface serial0/0/1.201 point-to-point R2(config-if)# frame-relay interface-dlci 201 R3(config)# interface serial0/0/1.301 point-to-point R3(config-if)# frame-relay interface-dlci 301

    Correct Answer
    D. R2(config)# interface serial0/0/1.201 point-to-point R2(config-if)# frame-relay interface-dlci 201 R3(config)# interface serial0/0/1.301 point-to-point R3(config-if)# frame-relay interface-dlci 301
    Explanation
    The correct answer is the fourth option. This is because it configures R2 and R3 with point-to-point frame relay connections using DLCIs 201 and 301 respectively. This configuration allows each router to have direct connectivity to R1 without any intermediate routers.

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  • 2. 

    Refer to the exhibit. Router R1 has been configured for Frame Relay connectivity to routers R2 and R3. What configuration option should be configured on the R2 and R3 serial interfaces in order for all routers to ping each other successfully?

    • A.

      R2(config-if)# frame-relay interface-dlci 201 broadcast R3(config-if)# frame-relay interface-dlci 301 broadcast

    • B.

      R2(config-if)# frame-relay map ip 10.1.1.1 201 broadcast R3(config-if)# frame-relay map ip 10.1.1.1 301 broadcast

    • C.

      R2(config-if)# frame-relay map ip 10.1.1.3 201 broadcast R3(config-if)# frame-relay map ip 10.1.1.2 301 broadcast

    • D.

      R2(config-if)# frame-relay map ip 10.1.1.1 201 broadcast R2(config-if)# frame-relay map ip 10.1.1.3 201 broadcast R3(config-if)# frame-relay map ip 10.1.1.1 301 broadcast R3(config-if)# frame-relay map ip 10.1.1.2 301 broadcast

    Correct Answer
    C. R2(config-if)# frame-relay map ip 10.1.1.3 201 broadcast R3(config-if)# frame-relay map ip 10.1.1.2 301 broadcast
    Explanation
    The correct answer is R2(config-if)# frame-relay map ip 10.1.1.3 201 broadcast and R3(config-if)# frame-relay map ip 10.1.1.2 301 broadcast. This is because the frame-relay map command is used to map an IP address to a specific DLCI on a Frame Relay interface. In order for all routers to ping each other successfully, R2 needs to map the IP address 10.1.1.3 to DLCI 201, and R3 needs to map the IP address 10.1.1.2 to DLCI 301. By using the broadcast keyword, the routers will be able to send broadcast traffic across the Frame Relay network.

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  • 3. 

    What best describes the use of a data-link connection identifier (DLCI)?

    • A.

      Local address identifying a destination router across a Frame Relay network

    • B.

      Locally significant address used to identify a virtual circuit

    • C.

      Logical address identifying the interface between a router and a Frame Relay switch

    • D.

      Logical address used to identify the DCE

    Correct Answer
    B. Locally significant address used to identify a virtual circuit
    Explanation
    A data-link connection identifier (DLCI) is a locally significant address used to identify a virtual circuit. In a Frame Relay network, virtual circuits are used to establish connections between devices. Each virtual circuit is assigned a unique DLCI which serves as an identifier for that specific circuit. The DLCI allows devices to differentiate between different virtual circuits and route data accordingly. Therefore, the DLCI is a locally significant address that is used to identify a virtual circuit within a Frame Relay network.

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  • 4. 

    What is created between two DTEs in a Frame Relay network?

    • A.

      ISDN circuit

    • B.

      Limited access circuit

    • C.

      Switched parallel circuit

    • D.

      Virtual circuit

    Correct Answer
    D. Virtual circuit
    Explanation
    In a Frame Relay network, a virtual circuit is created between two DTEs. A virtual circuit is a logical connection established over a physical network that allows data to be transmitted between the two devices. It provides a reliable and efficient means of communication, as it can dynamically allocate bandwidth based on the data traffic. This allows for optimal utilization of network resources and ensures that data is transmitted in a timely manner. Therefore, in a Frame Relay network, a virtual circuit is created between two DTEs to facilitate communication.

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  • 5. 

    Which two items allow the router to map data link layer addresses to network layer addresses in a Frame Relay network? (Choose Two)

    • A.

      ARP

    • B.

      RARP

    • C.

      Inverse ARP

    • D.

      LMI status messages

    • E.

      ICMP

    Correct Answer(s)
    C. Inverse ARP
    D. LMI status messages
    Explanation
    Inverse ARP and LMI status messages are the two items that allow the router to map data link layer addresses to network layer addresses in a Frame Relay network. Inverse ARP is used to dynamically map network layer addresses to data link layer addresses, allowing the router to determine the appropriate DLCI (Data Link Connection Identifier) for communication. LMI (Local Management Interface) status messages are used by the router to exchange information with the Frame Relay switch, including mapping tables that associate DLCIs with network layer addresses.

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  • 6. 

    Refer to the exhibit. A ping is sent to address 192.168.50.10 from the Peanut router. Which DLCI  will be used to send the ping?

    • A.

      110

    • B.

      115

    • C.

      220

    • D.

      225

    Correct Answer
    A. 110
  • 7. 

    Refer to the exhibit. What can be determined from the output?

    • A.

      Serial 0/0/0 has been configured with an DLCI of 201.

    • B.

      Serial 0/0/0 has the feature frame-relay inverse-arp enabled.

    • C.

      Serial 0/0/0 has been configured with an IP address of 172.16.4.3.

    • D.

      Serial 0/0/0 has been configured with the command frame-relay map ip 172.16.4.3 201 broadcast.

    Correct Answer
    A. Serial 0/0/0 has been configured with an DLCI of 201.
    Explanation
    The output shows that Serial 0/0/0 has been configured with an DLCI of 201.

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  • 8. 

    Refer to the exhibit. What effect does the point-to-point configuration on subinterface S0/0.110 have on the operation of the router?

    • A.

      It helps to conserve IP addresses.

    • B.

      It establishes multiple PVC connections to multiple physical interfaces.

    • C.

      It eliminates split horizon issues without increasing the likelihood of routing loops.

    • D.

      It requires the configuration of the encapsulation command on the subinterface.

    Correct Answer
    C. It eliminates split horizon issues without increasing the likelihood of routing loops.
    Explanation
    The point-to-point configuration on subinterface S0/0.110 eliminates split horizon issues without increasing the likelihood of routing loops. Split horizon is a technique used in distance-vector routing protocols to prevent routing loops by not advertising a route back out of the interface it was learned from. In a point-to-point configuration, there is only one other interface connected, so there is no need for split horizon. Additionally, the point-to-point configuration does not increase the likelihood of routing loops because there is only one possible path between the two interfaces.

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  • 9. 

    • A.

      Split horizon must be disabled.

    • B.

      The LMI type must be specified.

    • C.

      Logical subinterfaces must be used instead.

    • D.

      The frame-relay map commands are using incorrect DLCIs.

    Correct Answer
    D. The frame-relay map commands are using incorrect DLCIs.
  • 10. 

    • A.

      The IP address of the local Frame Relay interface is 172.16.1.4.

    • B.

      The local DLCI number is 401.

    • C.

      Inverse ARP is being used on this connection.

    • D.

      This interface is in the active state and in the process of negotiating configuration parameters.

    • E.

      Multicast is not enabled on this connection.

    Correct Answer(s)
    B. The local DLCI number is 401.
    C. Inverse ARP is being used on this connection.
  • 11. 

    Refer to the exhibit. What can be known about the configuration of router R1 from the output?

    • A.

      The Frame Relay LMI DLCI has been incorrectly configured as DLCI 1023.

    • B.

      The Frame Relay LMI type has been changed from its default.

    • C.

      The Serial 0/0/0 interface has been configured as a data Communications equipment device.

    • D.

      The command encapsulation frame-relay ietf has been used on the Serial 0/0/0 interface.

    Correct Answer
    D. The command encapsulation frame-relay ietf has been used on the Serial 0/0/0 interface.
    Explanation
    The output indicates that the command "encapsulation frame-relay ietf" has been used on the Serial 0/0/0 interface of router R1.

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  • 12. 

    Refer to the exhibit. What can be determined about the Frame Relay switch from the output shown?

    • A.

      It is currently not transmitting data.

    • B.

      It is in the process of establishing the PVC.

    • C.

      It has put a hold on processing frames in excess of the CIR.

    • D.

      It is experiencing congestion.

    Correct Answer
    D. It is experiencing congestion.
    Explanation
    Based on the given output, the Frame Relay switch is experiencing congestion. This can be determined because the output shows that the number of frames discarded due to congestion is increasing. This indicates that the switch is unable to handle the incoming traffic and is dropping frames to alleviate the congestion.

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  • 13. 

    What consideration must be taken into account if RIP is used on Frame Relay multiaccess networks?

    • A.

      To forward routing updates, address-to-DLCI mapping must be done via the use of the frame-relay map command coupled with the broadcast keyword.

    • B.

      Inverse ARP must be enabled to turn routing update broadcasts into unicast traffic that can be propagated to other Frame Relay nodes.

    • C.

      Because broadcast traffic is not supported, RIPv1 cannot be implemented on Frame Relay networks.

    • D.

      To forward broadcast routing updates, dynamic mapping must be enabled.

    Correct Answer
    A. To forward routing updates, address-to-DLCI mapping must be done via the use of the frame-relay map command coupled with the broadcast keyword.
    Explanation
    When using RIP on Frame Relay multiaccess networks, address-to-DLCI mapping must be done using the frame-relay map command with the broadcast keyword. This is necessary to forward routing updates. By using this command, the router will map IP addresses to specific DLCIs and send the updates as broadcast traffic. This ensures that the updates reach all the other routers on the Frame Relay network. Without this mapping, the updates would not be properly forwarded and the routing information would not be propagated correctly.

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  • 14. 

    Which statement about Frame Relay subinterfaces is correct?

    • A.

      Multipoint interfaces will automatically forward routing broadcasts but will consume more IP addresses than point-to-point subinterfaces will consume.

    • B.

      Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.

    • C.

      Interfaces with multiple PVCs require a separate subinterface for each PVC.

    • D.

      Multipoint configurations cannot use subinterfaces.

    Correct Answer
    B. Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues.
    Explanation
    Point-to-point subinterfaces act like leased lines and eliminate split-horizon routing issues. This means that with point-to-point subinterfaces, there is a direct connection between two devices, allowing for efficient and direct communication without the need for split-horizon routing, which can cause routing loops. This makes point-to-point subinterfaces a reliable and effective choice for connecting devices in a network.

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  • 15. 

    Refer to the exhibit. You are a network administrator who has been tasked with completing theFrame Relay topology that interconnects two remote sites. Router HQ belongs to both the172.16.1.0/24 and 172.16.2.0/24 subnets with IP addresses of 172.16.1.3 and 172.16.2.3 respectively.Traffic between R1 and R2 must travel through HQ first. How should the serial interface on HQ beconfigured to complete the topology?

    • A.

      One multipoint subinterface

    • B.

      Two point-to-point subinterfaces

    • C.

      With the physical interface configured with two ip addresses

    • D.

      One IP address on a point-to-point subinterface and one IP address on the physical interface

    Correct Answer
    B. Two point-to-point subinterfaces
    Explanation
    The correct answer is two point-to-point subinterfaces. This is because the traffic between R1 and R2 needs to travel through HQ first, which means that there needs to be a direct connection between each router and HQ. Using two point-to-point subinterfaces allows for a dedicated connection between each router and HQ, ensuring that the traffic flows properly.

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  • 16. 

    Refer to the exhibit. Router R2 is part of a Frame Relay network that uses OSPF for IP routing.After the commands that are shown are entered, R2 will not exchange OSPF information correctly.What is the likely cause?

    • A.

      The frame-relay map command requires the broadcast keyword.

    • B.

      The DLCIs on each end of the PVCs are not identical.

    • C.

      The R2 S0/0/0 interface has not been brought online.

    • D.

      The LMI or Inverse ARP or both are not working.

    Correct Answer
    A. The frame-relay map command requires the broadcast keyword.
    Explanation
    The likely cause for R2 not exchanging OSPF information correctly is that the frame-relay map command is missing the broadcast keyword. This keyword is necessary in order for OSPF updates to be sent as broadcast frames over the Frame Relay network. Without the broadcast keyword, OSPF updates will be sent as unicast frames, which will not be properly propagated to all routers in the network.

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  • 17. 

    Which three actions does a Frame Relay switch perform when it detects an excessive build-up of frames in its queue? (Choose three.)

    • A.

      Puts a hold on accepting frames in excess of the CIR

    • B.

      Drops frames from the queue that have the DE bit set

    • C.

      Re-negotiates flow control with the connected device

    • D.

      Sets the FECN bit on all frames it receives on the congested link

    • E.

      Sets the BECN bit on all frames it places on the congested link

    Correct Answer(s)
    B. Drops frames from the queue that have the DE bit set
    D. Sets the FECN bit on all frames it receives on the congested link
    E. Sets the BECN bit on all frames it places on the congested link
    Explanation
    When a Frame Relay switch detects an excessive build-up of frames in its queue, it performs three actions. Firstly, it drops frames from the queue that have the DE (Discard Eligible) bit set. This helps to free up space in the queue for incoming frames. Secondly, it sets the FECN (Forward Explicit Congestion Notification) bit on all frames it receives on the congested link. This notifies the connected devices that the link is congested and they should slow down transmission. Lastly, it sets the BECN (Backward Explicit Congestion Notification) bit on all frames it places on the congested link. This informs the connected devices that the switch itself is congested and they should slow down transmission.

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  • 18. 

    Which best describes the benefit of using Frame Relay as opposed to a leased line or ISDN service?

    • A.

      Customers can define their virtual circuit needs in far greater combinations, with increments as small as 64 kbps.

    • B.

      Customers pay for an end-to-end connection that includes the local loop and the network link.

    • C.

      Customers only pay for the local loop and the bandwidth they purchase from the network provider.

    • D.

      Connecting new sites requires new lower cost circuit installations when compared to ISDN dialup costs or adding additional hardware for leased service.

    Correct Answer
    C. Customers only pay for the local loop and the bandwidth they purchase from the network provider.
    Explanation
    Using Frame Relay allows customers to only pay for the local loop and the bandwidth they need to purchase from the network provider. This is a benefit compared to using a leased line or ISDN service, where customers would have to pay for an end-to-end connection that includes the local loop and the network link. With Frame Relay, customers have more flexibility in defining their virtual circuit needs and can choose smaller increments of bandwidth as low as 64 kbps. It also allows for lower cost circuit installations when connecting new sites, compared to the costs of ISDN dialup or adding additional hardware for leased service.

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  • 19. 

    • A.

      The broadcasts will be forwarded to 10.1.1.1.

    • B.

      The router will use DLCI 22 to forward data to 10.1.1.1.

    • C.

      DLCI 22 will replace the MAC address in the ARP table for entry 10.1.1.1

    • D.

      Frames arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22.

    • E.

      Inverse-ARP will now add an entry for 10.1.1.1 into the Frame Relay map table using DLCI 22.

    Correct Answer(s)
    B. The router will use DLCI 22 to forward data to 10.1.1.1.
    D. Frames arriving on interface serial 0/0/0 of RT_1 will have a data link layer address of 22.
  • 20. 

    • A.

      LMI updates are not being received properly.

    • B.

      The LMI type for the Serial 0/0/0 interface has been left to its default configuration.

    • C.

      Cisco HDLC is used as a Layer 2 encapsulation protocol on the Serial 0/0/0 interface.

    • D.

      The Serial 0/0/0 interface has been configured as a data communications equipment device.

    Correct Answer
    B. The LMI type for the Serial 0/0/0 interface has been left to its default configuration.
  • 21. 

    Refer to the exhibit. When troubleshooting a Frame Relay connection, an administrator entered the show interfaces s0/0 command and received the output shown in the exhibit. What are two probable reasons for this problem? (Choose two.)

    • A.

      The cable between the CSU/DSU and the router is disconnected.

    • B.

      The serial 0/0 interface is shutdown.

    • C.

      The router is not configured for the same Frame Relay PVC as the switch.

    • D.

      The LMI type on the Frame Relay switch is NOT ANSI.

    • E.

      The address of the Frame Relay switch is not in the routing table.

    Correct Answer(s)
    C. The router is not configured for the same Frame Relay PVC as the switch.
    D. The LMI type on the Frame Relay switch is NOT ANSI.
    Explanation
    The first probable reason for the problem is that the router is not configured for the same Frame Relay PVC as the switch. This means that the router and the switch are not using the same virtual circuit for communication, causing a mismatch.

    The second probable reason is that the LMI type on the Frame Relay switch is not ANSI. LMI (Local Management Interface) is used for communication between the router and the Frame Relay switch. If the LMI type is not set to ANSI, it can cause compatibility issues and prevent proper communication between the devices.

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  • 22. 

    What two methods does Frame Relay technology use to process frames that contain errors? (Choose two.)

    • A.

      Frame Relay services depend on the upper layer protocols to handle error recovery.

    • B.

      It requires the receiving device to request that the sender retransmit erroneous frames.

    • C.

      FECN, BECN, and DE bits are set in the frames to minimize errors.

    • D.

      The receiving device drops any frames that contain errors without notifying the sender.

    • E.

      The frame relay switch notifies the sender that errors were detected.

    Correct Answer(s)
    A. Frame Relay services depend on the upper layer protocols to handle error recovery.
    D. The receiving device drops any frames that contain errors without notifying the sender.
    Explanation
    Frame Relay technology does not have its own error recovery mechanism. Instead, it relies on upper layer protocols to handle error recovery. This means that Frame Relay services depend on protocols like TCP or UDP to detect and recover from errors in the transmitted frames. Additionally, when a receiving device detects an error in a frame, it simply drops the frame without notifying the sender. This means that the sender is not aware that errors occurred and does not need to retransmit the frame.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Apr 14, 2010
    Quiz Created by
    Rodney.butler
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