CCNA Lan Chapter #3

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CCNA Lan Chapter #3 - Quiz

It’s time for yet another quiz on the topic of the local area network (LAN), where we’ll be looking at how this small computer network is able to link multiple devices within an enclosed range, such as a building or a kilometre-radius. Can you answer all the questions and advance in your CCNA studies?


Questions and Answers
  • 1. 

     Refer to the exhibit. Computer 1 sends a frame to computer 4. On which links along the path between computer 1 and computer 4 will a VLAN ID tag be included with the frame?

    • A.

      A

    • B.

      A,B

    • C.

      A,B,D,G

    • D.

      C,E

    • E.

      C,E,F

    Correct Answer
    D. C,E
    Explanation
    A VLAN ID tag will be included with the frame on the links between computer 1 and computer 4 that correspond to switches C and E.

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  • 2. 

    The network administrator wants to separate hosts in Building A into two VLANs numbered 20 and 30. Which two statements are true concerning VLAN configuration? (Choose two.)

    • A.

      The VLANs may be named.

    • B.

      VLAN information is saved in the startup configuration.

    • C.

      Non-default VLANs created manually must use the extended range VLAN numbers.

    • D.

      The network administrator may create the VLANs in either global configuration mode or VLAN database mode.

    • E.

      Both VLANs may be named BUILDING_A to distinguish them from other VLANs in different geographical locations.

    Correct Answer(s)
    A. The VLANs may be named.
    D. The network administrator may create the VLANs in either global configuration mode or VLAN database mode.
    Explanation
    The network administrator can choose to name the VLANs in Building A. This allows for easier identification and management of the VLANs. Additionally, the network administrator has the flexibility to create the VLANs in either global configuration mode or VLAN database mode. This gives them different options for configuring and managing the VLANs based on their preference and requirements.

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  • 3. 

    What switch port modes will allow a switch to successfully form a trunking link if the neighboring switch port is in "dynamic desirable" mode?

    • A.

      Dynamic desirable mode

    • B.

      On or dynamic desirable mode

    • C.

      On, auto, or dynamic desirable mode

    • D.

      On, auto, dynamic desirable, or nonegotiate mode

    Correct Answer
    C. On, auto, or dynamic desirable mode
    Explanation
    The switch port modes that will allow a switch to successfully form a trunking link if the neighboring switch port is in "dynamic desirable" mode are on, auto, or dynamic desirable mode. In "dynamic desirable" mode, the switch port actively tries to negotiate a trunking link with the neighboring switch. The "on" mode forces the switch port to be a trunk port, the "auto" mode allows the switch port to negotiate whether to be a trunk or access port, and the "dynamic desirable" mode actively negotiates a trunking link. Therefore, any of these three modes will be compatible with the "dynamic desirable" mode on the neighboring switch port.

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  • 4. 

    What is the effect of the switchport mode dynamic desirable command?

    • A.

      DTP cannot negotiate the trunk since the native VLAN is not the default VLAN.

    • B.

      The remote connected interface cannot negotiate a trunk unless it is also configured as dynamic desirable.

    • C.

      The connected devices dynamically determine when data for multiple VLANs must be transmitted across the link and bring the trunk up as needed.

    • D.

      A trunk link is formed if the remote connected device is configured with the switchport mode dynamic auto or switchport mode trunk commands.

    Correct Answer
    D. A trunk link is formed if the remote connected device is configured with the switchport mode dynamic auto or switchport mode trunk commands.
    Explanation
    The switchport mode dynamic desirable command allows the connected devices to dynamically determine when data for multiple VLANs needs to be transmitted across the link and brings the trunk up as needed. This means that if the remote connected device is configured with the switchport mode dynamic auto or switchport mode trunk commands, a trunk link will be formed.

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  • 5. 

    What is a valid consideration for planning VLAN traffic across multiple switches?

    • A.

      Configuring interswitch connections as trunks will cause all hosts on any VLAN to receive broadcasts from the other VLANs.

    • B.

      A trunk connection is affected by broadcast storms on any particular VLAN that is carried by that trunk.

    • C.

      Restricting trunk connections between switches to a single VLAN will improve efficiency of port usage.

    • D.

      Carrying all required VLANs on a single access port will ensure proper traffic separation.

    Correct Answer
    B. A trunk connection is affected by broadcast storms on any particular VLAN that is carried by that trunk.
    Explanation
    Configuring interswitch connections as trunks allows for the transmission of multiple VLANs over a single physical connection. However, if a broadcast storm occurs on any VLAN that is carried by that trunk, it will affect the entire trunk connection, potentially causing network performance issues.

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  • 6. 

    Refer to the exhibit. Which two conclusions can be drawn regarding the switch that produced the output shown? (Choose two.)

    • A.

      The network administrator configured VLANs 1002-1005.

    • B.

      The VLANs are in the active state and are in the process of negotiating configuration parameters.

    • C.

      A FDDI trunk has been configured on this switch.

    • D.

      The command switchport access vlan 20 was entered in interface configuration mode for Fast Ethernet interface 0/1.

    • E.

      Devices attached to ports fa0/5 through fa0/8 cannot communicate with devices attached to ports fa0/9 through fa0/12 without the use of a Layer 3 device.

    Correct Answer(s)
    D. The command switchport access vlan 20 was entered in interface configuration mode for Fast Ethernet interface 0/1.
    E. Devices attached to ports fa0/5 through fa0/8 cannot communicate with devices attached to ports fa0/9 through fa0/12 without the use of a Layer 3 device.
    Explanation
    Based on the given output, it can be concluded that the command "switchport access vlan 20" was entered in interface configuration mode for Fast Ethernet interface 0/1. This means that VLAN 20 is configured on this switch and any device connected to interface fa0/1 will be a member of VLAN 20. Additionally, it can be inferred that devices connected to ports fa0/5 through fa0/8 cannot communicate with devices connected to ports fa0/9 through fa0/12 without the use of a Layer 3 device. This suggests that these ports are in different VLANs and require a Layer 3 device, such as a router, to enable communication between them.

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  • 7. 

    What must the network administrator do to remove Fast Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3?

    • A.

      Enter the no vlan 2 and the vlan 3 commands in global configuration mode.

    • B.

      Enter the switchport access vlan 3 command in interface configuration mode.

    • C.

      Enter the switchport trunk native vlan 3 command in interface configuration mode.

    • D.

      Enter the no shutdown in interface configuration mode to return it to the default configuration and then configure the port for VLAN 3.

    Correct Answer
    B. Enter the switchport access vlan 3 command in interface configuration mode.
    Explanation
    To remove Fast Ethernet port fa0/1 from VLAN 2 and assign it to VLAN 3, the network administrator should enter the "switchport access vlan 3" command in interface configuration mode. This command configures the port to belong to VLAN 3, effectively removing it from VLAN 2 and assigning it to the new VLAN.

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  • 8. 

    What statements describe how hosts on VLANs communicate?

    • A.

      Hosts on different VLANs use VTP to negotiate a trunk.

    • B.

      Hosts on different VLANs communicate through routers.

    • C.

      Hosts on different VLANs should be in the same IP network.

    • D.

      Hosts on different VLANs examine VLAN ID in the frame tagging to determine if the frame for their network.

    Correct Answer
    B. Hosts on different VLANs communicate through routers.
    Explanation
    Hosts on different VLANs communicate through routers because VLANs are designed to separate broadcast domains. Each VLAN represents a separate broadcast domain, and by default, hosts within the same VLAN can communicate with each other using Layer 2 switching. However, in order to communicate with hosts in different VLANs, a router is required to route traffic between the VLANs. The router acts as a gateway, allowing communication between hosts on different VLANs by forwarding traffic between the VLANs based on their IP addresses.

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  • 9. 

    Refer to the exhibit. How far is a broadcast frame that is sent by computer A propagated in the LAN domain?

    • A.

      None of the computers will receive the broadcast frame

    • B.

      Computer A, computer B, computer C

    • C.

      Computer A, computer D, computer G

    • D.

      Computer D, computer G

    • E.

      Computer A, computer B, computer C, computer D, computer E, computer F, computer G, computer H, computer I

    Correct Answer
    D. Computer D, computer G
    Explanation
    The broadcast frame sent by computer A will only be propagated to computer D and computer G in the LAN domain. This means that only these two computers will receive the broadcast frame.

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  • 10. 

    A network administrator is removing several VLANs from a switch. When the administrator enters the no vlan 1 command, an error is received. Why did this command generate an error?

    • A.

      VLAN 1 can never be deleted.

    • B.

      VLAN 1 can only be deleted by deleting the vlan.dat file.

    • C.

      VLAN 1 can not be deleted until all ports have been removed from it.

    • D.

      VLAN 1 can not be deleted until another VLAN has been assigned its responsibilities.

    Correct Answer
    A. VLAN 1 can never be deleted.
    Explanation
    The command generated an error because VLAN 1 cannot be deleted. VLAN 1 is the default VLAN and is always present on a switch. It is used for management purposes and cannot be removed.

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  • 11. 

    Refer to the exhibit. SW1 and SW2 are new switches being installed in the topology shown in the exhibit. Interface Fa0/1 on switch SW1 has been configured with trunk mode “on”. Which statement is true about forming a trunk link between the switches SW1 and SW2?

    • A.

      Interface Fa0/2 on switch SW2 will negotiate to become a trunk link if it supports DTP.

    • B.

      Interface Fa0/2 on switch SW2 can only become a trunk link if statically configured as a trunk.

    • C.

      Interface Fa0/1 converts the neighboring link on the adjacent switch into a trunk link if the neighboring interface is configured in nonegotiate mode.

    • D.

      Interface Fa0/1 converts the neighboring link on the adjacent switch into a trunk link automatically with no consideration of the configuration on the neighboring interface.

    Correct Answer
    A. Interface Fa0/2 on switch SW2 will negotiate to become a trunk link if it supports DTP.
    Explanation
    DTP (Dynamic Trunking Protocol) is a Cisco proprietary protocol used to negotiate and establish trunk links between switches. If both switches support DTP, they will automatically negotiate and form a trunk link. Therefore, Interface Fa0/2 on switch SW2 will negotiate to become a trunk link if it supports DTP.

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  • 12. 

    Refer to the exhibit. Computer B is unable to communicate with computer D. What is the most likely cause of this problem?

    • A.

      The link between the switches is up but not trunked.

    • B.

      VLAN 3 is not an allowed VLAN to enter the trunk between the switches.

    • C.

      The router is not properly configured to route traffic between the VLANs.

    • D.

      Computer D does not have a proper address for the VLAN 3 address space.

    Correct Answer
    D. Computer D does not have a proper address for the VLAN 3 address space.
    Explanation
    Computer D does not have a proper address for the VLAN 3 address space. This means that computer D is not configured with the correct IP address or subnet mask for the VLAN 3 network. As a result, it is unable to communicate with other devices on that VLAN.

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  • 13. 

    What statement about the 802.1q trunking protocol is true?

    • A.

      802.1q is Cisco proprietary.

    • B.

      802.1q frames are mapped to VLANs by MAC address.

    • C.

      802.1q does NOT require the FCS of the original frame to be recalculated.

    • D.

      802.1q will not perform operations on frames that are forwarded out access ports.

    Correct Answer
    D. 802.1q will not perform operations on frames that are forwarded out access ports.
  • 14. 

    What happens to the member ports of a VLAN when the VLAN is deleted?

    • A.

      The ports cannot communicate with other ports.

    • B.

      The ports default back to the management VLAN.

    • C.

      The ports automatically become a part of VLAN1.

    • D.

      The ports remain a part of that VLAN until the switch is rebooted. They then become members of the management VLAN.

    Correct Answer
    A. The ports cannot communicate with other ports.
    Explanation
    When a VLAN is deleted, the member ports of that VLAN lose their ability to communicate with other ports. Deleting a VLAN removes the virtual network configuration, causing the member ports to lose their association with the VLAN. As a result, communication between the member ports is no longer possible.

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  • 15. 

    Switch port fa0/1 was manually configured as a trunk, but now it will be used to connect a host to the network. How should the network administrator reconfigure switch port Fa0/1?

    • A.

      Disable DTP.

    • B.

      Delete any VLANs currently being trunked through port Fa0/1.

    • C.

      Administratively shut down and re-enable the interface to return it to default.

    • D.

      Enter the switchport mode access command in interface configuration mode.

    Correct Answer
    D. Enter the switchport mode access command in interface configuration mode.
    Explanation
    The network administrator should reconfigure switch port Fa0/1 by entering the switchport mode access command in interface configuration mode. This command will configure the port as an access port, allowing it to connect a host to the network. By doing so, the port will no longer function as a trunk port, which is necessary in this scenario.

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  • 16. 

    Refer to the exhibit. Company HR is adding PC4, a specialized application workstation, to a new company office. The company will add a switch, S3, connected via a trunk link to S2, another switch. For security reasons the new PC will reside in the HR VLAN, VLAN 10. The new office will use the 172.17.11.0/24 subnet. After installation, the existing PCs are unable to access shares on PC4. What is the likely cause?

    • A.

      The switch to switch connection must be configured as an access port to permit access to VLAN 10 on S3.

    • B.

      The new PC is on a different subnet so Fa0/2 on S3 must be configured as a trunk port.

    • C.

      PC4 must use the same subnet as the other HR VLAN PCs.

    • D.

      A single VLAN cannot span multiple switches.

    Correct Answer
    C. PC4 must use the same subnet as the other HR VLAN PCs.
    Explanation
    PC4 must use the same subnet as the other HR VLAN PCs because in order for devices to communicate with each other, they must be on the same subnet. Since the existing PCs are unable to access shares on PC4, it suggests that they are not on the same subnet. Therefore, PC4 needs to be configured with the appropriate IP address in the 172.17.11.0/24 subnet to ensure proper communication within the HR VLAN.

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  • 17. 

    Refer to the exhibit. The network administrator has just added VLAN 50 to Switch1 and Switch2 and assigned hosts on the IP addresses of the VLAN in the 10.1.50.0/24 subnet range. Computer A can communicate with computer B, but not with computer C or computer D. What is the most likely cause of this problem?

    • A.

      There is a native VLAN mismatch.

    • B.

      The link between Switch1 and Switch2 is up but not trunked.

    • C.

      The router is not properly configured for inter-VLAN routing.

    • D.

      VLAN 50 is not allowed to entering the trunk between Switch1 and Switch2.

    Correct Answer
    D. VLAN 50 is not allowed to entering the trunk between Switch1 and Switch2.
    Explanation
    The most likely cause of the problem is that VLAN 50 is not allowed to enter the trunk between Switch1 and Switch2. This means that the VLAN is not being properly propagated across the switches, causing computer C and computer D to be unable to communicate with computer A.

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  • 18. 

    What are two characteristics of VLAN1 in a default switch configuration? (Choose two.)

    • A.

      VLAN1 should renamed.

    • B.

      VLAN 1 is the management VLAN.

    • C.

      All switch ports are members of VLAN1.

    • D.

      Only switch port 0/1 is assigned to VLAN1.

    • E.

      Links between switches must be members of VLAN1.

    Correct Answer(s)
    B. VLAN 1 is the management VLAN.
    C. All switch ports are members of VLAN1.
    Explanation
    In a default switch configuration, VLAN 1 is the management VLAN, which means it is used for managing the switch. This VLAN is typically used for remote access to the switch, such as through Telnet or SSH. Additionally, all switch ports are members of VLAN 1 by default, meaning that any device connected to the switch will be part of VLAN 1 unless specifically configured otherwise.

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  • 19. 

    Which two statements describe the benefits of VLANs? (Choose two.)

    • A.

      VLANs improve network performance by regulating flow control and window size.

    • B.

      VLANs enable switches to route packets to remote networks via VLAN ID filtering.

    • C.

      VLANs reduce network cost by reducing the number of physical ports required on switches.

    • D.

      VLANs improve network security by isolating users that have access to sensitive data and applications.

    • E.

      VLANs divide a network into smaller logical networks, resulting in lower susceptibility to broadcast storms.

    Correct Answer(s)
    D. VLANs improve network security by isolating users that have access to sensitive data and applications.
    E. VLANs divide a network into smaller logical networks, resulting in lower susceptibility to broadcast storms.
    Explanation
    VLANs improve network security by isolating users that have access to sensitive data and applications. By separating the network into smaller logical networks, VLANs restrict the access of unauthorized users to sensitive information, enhancing security.

    VLANs divide a network into smaller logical networks, resulting in lower susceptibility to broadcast storms. By segmenting the network, VLANs limit the scope of broadcast storms, preventing them from affecting the entire network and improving overall network performance and stability.

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  • 20. 

    Refer to the exhibit. The exhibited configurations do not allow the switches to form a trunk. What is the most likely cause of this problem?

    • A.

      Cisco switches only support the ISL trunking protocol.

    • B.

      The trunk cannot be negotiated with both ends set to auto.

    • C.

      By default, Switch1 will only allow VLAN 5 across the link.

    • D.

      A common native VLAN should have been configured on the switches.

    Correct Answer
    B. The trunk cannot be negotiated with both ends set to auto.
    Explanation
    The most likely cause of the problem is that the trunk cannot be negotiated with both ends set to auto. This means that the switches are not able to automatically establish a trunk connection between them.

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  • 21. 

    Refer to the exhibit. Which statement is true concerning interface Fa0/5?

    • A.

      The default native VLAN is being used.

    • B.

      The trunking mode is set to auto.

    • C.

      Trunking can occur with non-Cisco switches.

    • D.

      VLAN information about the interface encapsulates the Ethernet frames.

    Correct Answer
    C. Trunking can occur with non-Cisco switches.
    Explanation
    The statement "Trunking can occur with non-Cisco switches" is true concerning interface Fa0/5. This means that the interface is capable of carrying traffic for multiple VLANs using trunking, regardless of whether the connected switch is a Cisco switch or not.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jan 24, 2010
    Quiz Created by
    Rodney.butler
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