The Ultimate Networking Quiz: VLAN

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The Ultimate Networking Quiz: VLAN - Quiz

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Questions and Answers
  • 1. 

    Which of the following is true regarding all layer 2 switches?

    • A.

      They provide inter-VLAN routing by default

    • B.

      An external route processor can be attached to the backplane of the switch to provide inter-VLAN routing.

    • C.

      They break up collision domains by default

    • D.

      They break up broadcast domains by default

    Correct Answer
    C. They break up collision domains by default
    Explanation
    Layer 2 switches break up collision domains by default. Collision domains are segments of a network where packets can collide with each other, causing data loss and network congestion. Layer 2 switches use MAC addresses to forward packets only to the intended recipient, effectively separating devices into different collision domains. This improves network performance and reduces the likelihood of collisions.

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  • 2. 

    How many subinterfaces may be created on a FastEthernet port?

    • A.

      2

    • B.

      1000

    • C.

      20000

    • D.

      4.2 billion

    Correct Answer
    D. 4.2 billion
    Explanation
    The answer "4.2 billion" suggests that a FastEthernet port can have a very large number of subinterfaces created on it. This indicates that there is no specific limit to the number of subinterfaces that can be created on a FastEthernet port.

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  • 3. 

    How many VLANs can you create with subinterfaces on a FastEthernet interface?

    • A.

      2

    • B.

      1000

    • C.

      20000

    • D.

      4.2 billion

    Correct Answer
    B. 1000
    Explanation
    With subinterfaces on a FastEthernet interface, you can create up to 1000 VLANs. Subinterfaces allow for the division of a physical interface into multiple logical interfaces, each capable of supporting a different VLAN. Therefore, by creating subinterfaces, you can effectively increase the number of VLANs that can be created on a FastEthernet interface to a maximum of 1000.

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  • 4. 

    To view the routing table on the multilayer switch, use the __________command.

    • A.

      Show ip route

    • B.

      Show routing protocol

    • C.

      Sho vlan

    • D.

      Show config

    Correct Answer
    A. Show ip route
    Explanation
    The correct answer is "show ip route" because this command is used to view the routing table on a multilayer switch. The routing table contains information about the network destinations and the routes to reach them. By using this command, network administrators can see the routes that the switch has learned and make necessary adjustments or troubleshoot any routing issues.

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  • 5. 

    Which of the following sets VLAN 3 to run ISL on an external router with one FastEthernet interface?

    • A.

      Switch(config)#encap vlan3 isl

    • B.

      Switch(config-subif)#encap isl 3

    • C.

      Switch(config-if)#encap 3 isl

    • D.

      Switch(config)#encap isl vlan3

    Correct Answer
    B. Switch(config-subif)#encap isl 3
    Explanation
    The correct answer is Switch(config-subif)#encap isl 3. This command configures the VLAN 3 interface on the switch to use the ISL encapsulation protocol when communicating with an external router.

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  • 6. 

    What command is used to set a virtual hardware address on a VLAN interface?

    • A.

      Set mac mac-address

    • B.

      Set vlan mac-address mac-address

    • C.

      Mac-address mac_address

    • D.

      Config mac slot/port mac-address

    Correct Answer
    C. Mac-address mac_address
    Explanation
    The command "mac-address mac_address" is used to set a virtual hardware address on a VLAN interface. This command allows the user to specify a specific MAC address to be assigned to the VLAN interface, which is important for network communication and identification purposes. By setting a virtual hardware address, the user can ensure that the VLAN interface is uniquely identified within the network.

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  • 7. 

    What is one distinction between Layer 2 and Layer 3 operations at the core?

    • A.

      The Layer 2 core offers more control through QoS, the Layer 3 is limited to the use of routing protocols. The Layer 2 core manages its redundant links using a switching protocol, the Layer 3 core The Layer 2 core offers more control through QoS, the Layer 3 is limited to the use of routing protocols.

    • B.

      The Layer 2 core manages its redundant links using STP, the Layer 3 core manages redundant The Layer 2 core manages its redundant links using a switching protocol, the Layer 3 core manages redundant links by using STP

    • C.

      The Layer 2 core manages its redundant links using STP, the Layer 3 core manages redundant links using a routing protocol.

    • D.

      The Layer 2 core makes use of redundant links by load balanacing, the Layer 3 core does not allow load balancing across redundant links

    Correct Answer
    C. The Layer 2 core manages its redundant links using STP, the Layer 3 core manages redundant links using a routing protocol.
    Explanation
    The distinction between Layer 2 and Layer 3 operations at the core is that the Layer 2 core manages its redundant links using STP (Spanning Tree Protocol), while the Layer 3 core manages redundant links using a routing protocol. STP is a protocol that prevents loops in a network by blocking redundant links, ensuring a loop-free topology. On the other hand, a routing protocol is used in Layer 3 to determine the best path for data packets to reach their destination. Therefore, the Layer 2 core focuses on link redundancy management, while the Layer 3 core focuses on routing and path selection.

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  • 8. 

    In which situation could individual router physical interfaces (not subinterfaces) be used for InterVLAN routing, instead of a router-on-a-stick configuration?

    • A.

      Single VLAN networks

    • B.

      Networks with many VLANs

    • C.

      Networks with few VLANs

    • D.

      Large scalable networks

    Correct Answer
    C. Networks with few VLANs
    Explanation
    In networks with few VLANs, individual router physical interfaces can be used for InterVLAN routing instead of a router-on-a-stick configuration. This is because the number of VLANs is small, and each VLAN can be assigned to a separate physical interface on the router. This allows for direct routing between the VLANs without the need for a trunk link and subinterfaces.

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  • 9. 

    What is a correct configuration for a subinterface on a external router?

    • A.

      Int fa0/0.3980

    • B.

      Faste 0/0 subinterface 3

    • C.

      Int 10.f0/0

    • D.

      Set int f0/0.1

    Correct Answer
    A. Int fa0/0.3980
    Explanation
    A correct configuration for a subinterface on an external router would be "int fa0/0.3980". This means that the subinterface is on the FastEthernet 0/0 interface and has a VLAN ID of 3980.

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  • 10. 

      If you assigned a virtual hardware address (SVI) to VLAN2 on a multilayer switch, how do you view this configuration?

    • A.

      show interface vlan 2

    • B.

      Show virtual address

    • C.

      Show ip vlan 2

    • D.

      Set show MAC

    Correct Answer
    A. show interface vlan 2
    Explanation
    To view the configuration of the virtual hardware address (SVI) assigned to VLAN2 on a multilayer switch, you can use the command "show interface vlan 2". This command will display the interface details and configuration settings specifically for VLAN2.

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  • 11. 

    What routing protocols must be configured on a multilayer switch to route between directly connected VLANs?

    • A.

      RIP, as long as the same subnet is used throughout.

    • B.

      Routing protocols are enabled by default.

    • C.

      EIGRP or IGRP with ISL, RIP or OSPF with 802.1Q

    • D.

      None- directly connected subnets automatically appear in the routing table

    Correct Answer
    D. None- directly connected subnets automatically appear in the routing table
    Explanation
    Directly connected subnets automatically appear in the routing table on a multilayer switch when routing between directly connected VLANs. Therefore, no routing protocols need to be configured in this scenario.

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  • 12. 

    What is the most scalable inter-VLAN routing option?

    • A.

      Router

    • B.

      Router-on-a-stick

    • C.

      Layer 3 switch

    • D.

      Layer 2 switch

    Correct Answer
    C. Layer 3 switch
    Explanation
    A Layer 3 switch is the most scalable inter-VLAN routing option because it combines the functionality of a router and a switch. It can route traffic between VLANs at wire speed, making it faster and more efficient than a router. Additionally, a Layer 3 switch can handle a larger number of VLANs and has more advanced routing capabilities, such as support for dynamic routing protocols. This makes it the ideal choice for large networks that require high-performance inter-VLAN routing.

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  • 13. 

    What is an advantage of using multilayer switches?

    • A.

      The route switch processor is faster since all switching is performed in software

    • B.

      The route processor also performs the switching of Layer 2 packets between switch ports.

    • C.

      It is not as efficient as router-on-a-stick

    • D.

      The router is highly integrated within the switch and allows high speed routing.

    Correct Answer
    D. The router is highly integrated within the switch and allows high speed routing.
    Explanation
    Multilayer switches have the advantage of high-speed routing because the router is integrated within the switch. This integration allows for faster processing of routing tasks compared to a separate router. As a result, multilayer switches can efficiently handle the switching of Layer 2 packets between switch ports while also performing routing functions. This integration eliminates the need for a separate router-on-a-stick configuration, making multilayer switches a more efficient solution for routing tasks.

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  • 14. 

    The FastEthernet port on a router is connected to a switch port. The router is performing InterVLAN routing over this single trunk link for five VLANs. How is this configuration described?

    • A.

      Layer 4 switching

    • B.

      Layer 3 switching

    • C.

      Router-on-a-stick

    • D.

      Route switch processing

    Correct Answer
    C. Router-on-a-stick
    Explanation
    This configuration is described as "router-on-a-stick". In this setup, a single trunk link between the router's FastEthernet port and the switch port is used for interVLAN routing. The router acts as a gateway for the VLANs, allowing them to communicate with each other. By using a single trunk link, it simplifies the network design and reduces the number of physical connections required.

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  • 15. 

    What type of link must be used on a switch port if you are running ISL on an external router interface?

    • A.

      Trunk

    • B.

      Ethernet

    • C.

      Virtual

    • D.

      Access

    Correct Answer
    A. Trunk
    Explanation
    If you are running ISL (Inter-Switch Link) on an external router interface, you would need to use a Trunk link on the switch port. A Trunk link allows for the transmission of multiple VLANs (Virtual Local Area Networks) over a single link, which is necessary when using ISL. This allows the switch and the router to communicate and exchange VLAN information effectively.

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  • 16. 

      Which protocol is used to carry multiple VLANs over a single trunk?

    • A.

      802.2

    • B.

      802.11B

    • C.

      802.3

    • D.

      802.1Q

    Correct Answer
    D. 802.1Q
    Explanation
    The correct answer is 802.1Q. This protocol is used to carry multiple VLANs (Virtual Local Area Networks) over a single trunk. It adds a VLAN tag to the Ethernet frame, allowing the network devices to identify and separate the VLAN traffic. This helps in improving network efficiency and scalability by allowing multiple VLANs to coexist on the same physical network infrastructure.

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  • 17. 

    Which command enables routing on a physical port of a Catalyst switch?

    • A.

      Switchport mode routing

    • B.

      Switchport mode route

    • C.

      No switchport

    • D.

      No switchport mode access no switchport mode access

    Correct Answer
    C. No switchport
    Explanation
    The correct answer is "no switchport". This command is used to remove the switchport configuration from a physical port on a Catalyst switch and enable routing on that port. By removing the switchport configuration, the port is no longer treated as a Layer 2 switchport and can be configured with Layer 3 IP addressing and routing protocols.

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  • 18. 

      If you assigned a virtual hardware address (SVI) to VLAN2 on a multilayer switch, how do you view this configuration?

    • A.

      Show hardware address

    • B.

      Show vlan 2

    • C.

      Show run

    • D.

      Show virtual address

    Correct Answer
    C. Show run
    Explanation
    To view the configuration of the virtual hardware address (SVI) assigned to VLAN2 on a multilayer switch, you would use the "show run" command. This command displays the running configuration of the switch, including any SVI configurations.

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  • 19. 

    What is the primary advantage of using a trunk link?

    • A.

      Provides more bandwidth for each trunked VLAN

    • B.

      Allows for a single VLAN on each physical port

    • C.

      Creates less overhead on the router

    • D.

      Reduction of router and switch ports

    Correct Answer
    D. Reduction of router and switch ports
    Explanation
    The primary advantage of using a trunk link is the reduction of router and switch ports. Trunking allows multiple VLANs to be carried over a single physical link, reducing the number of ports required on both the router and the switch. This helps to optimize the use of available ports and simplifies network management.

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  • 20. 

    Which of the following is used to configure VLAN 1 on an switch with an IP address of 208.211.78.200/28?

    • A.

      Switch(config)#int vlan 1 Switch(config-if)#ip address 208.211.78.200 255.255.255.240

    • B.

      Switch#conf t Switch(config)#vlan1 ip address 208.21.78.200 255.255.255.240

    • C.

      Switch(config)#set vlan1 ip address 208.21.78.200 255.255.255.240

    • D.

      Switch(config)#set int vlan1 Switch(config)#ip address 208.211.78.200 255.255.255.240

    Correct Answer
    A. Switch(config)#int vlan 1 Switch(config-if)#ip address 208.211.78.200 255.255.255.240
    Explanation
    The correct answer is "Switch(config)#int vlan 1 Switch(config-if)#ip address 208.211.78.200 255.255.255.240". This is the correct command sequence to configure VLAN 1 on a switch with the given IP address and subnet mask. The "int vlan 1" command is used to enter the interface configuration mode for VLAN 1, and the "ip address" command is used to assign the IP address and subnet mask to the interface.

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