VLAN & Configuration Quiz
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Questions and Answers

What is a primary benefit of VLANs in network administration?

  • Simplified administration (correct)
  • Reduced network cost
  • Improved network security
  • Increased network bandwidth

    • Which of the following is NOT a common use case for VLANs?

  • Guest Internet access
  • Wireless network (correct)
  • Network management
  • Production

    • What is a potential security concern with VLANs?

  • They provide a high level of security
  • They can be easily implemented
  • They are only used for voice over IP
  • They can be defeated unless implemented carefully (correct)

    • What can quality of service schemes optimize on trunk links?

    <p>Traffic for real-time or low-latency requirements</p> Signup and view all the answers

    Which of the following network technologies has VLAN capabilities?

    <p>Fiber Distributed Data Interface (FDDI)</p> Signup and view all the answers

    Why was Ethernet limited in scaling up?

    <p>It was a broadcast network</p> Signup and view all the answers

    What was the speed of Ethernet in the early experiments?

    <p>10 Mbit/s</p> Signup and view all the answers

    What was the estimated total bandwidth of the telephone network?

    <p>1 Tbit/s</p> Signup and view all the answers

    Who addressed the problem of scaling up Ethernet networks?

    <p>Dr. W. David Sincoskie</p> Signup and view all the answers

    What is the primary purpose of VLANs?

    <p>To divide a single broadcast domain into multiple broadcast domains</p> Signup and view all the answers

    What does VLAN stand for?

    <p>Virtual Local Area Network</p> Signup and view all the answers

    At which OSI layer do VLANs operate?

    <p>Data link layer (OSI layer 2)</p> Signup and view all the answers

    What is the purpose of VLAN tagging?

    <p>To mark frames and handle them in networking systems</p> Signup and view all the answers

    What is the benefit of using VLAN trunks?

    <p>To transport data for multiple VLANs over a single interconnect</p> Signup and view all the answers

    What is the purpose of network architects setting up VLANs?

    <p>To provide network segmentation</p> Signup and view all the answers

    What is the function of routers between VLANs?

    <p>To filter broadcast traffic</p> Signup and view all the answers

    What is a benefit of VLANs in terms of network management?

    <p>Reduced network management</p> Signup and view all the answers

    What is the purpose of link aggregation in VLAN trunks?

    <p>To route data efficiently</p> Signup and view all the answers

    What was the main issue with using IP routing to connect multiple Ethernet networks together?

    <p>It was too expensive</p> Signup and view all the answers

    What did Sincoskie reinvent while looking for alternatives to IP routing?

    <p>Transparent bridging</p> Signup and view all the answers

    What is required to connect multiple Ethernet networks in a fault-tolerant fashion using switches?

    <p>Redundant paths through the network</p> Signup and view all the answers

    What is the purpose of the VLAN tag in an Ethernet frame?

    <p>To assign a switch to handle frames of a single color</p> Signup and view all the answers

    What is the result of sending a mix of different frame colors in a multitree bridge?

    <p>Improved aggregate bandwidth</p> Signup and view all the answers

    What is the IEEE standard that describes Ethernet VLANs?

    <p>IEEE 802.1Q-1998</p> Signup and view all the answers

    What is the purpose of the IEEE 802.1ad standard?

    <p>To allow nested VLAN tags</p> Signup and view all the answers

    Why did Sincoskie invent VLANs?

    <p>To alleviate the bottleneck problem</p> Signup and view all the answers

    What is the term used to describe the VLAN tag in an Ethernet frame?

    <p>IEEE 802.1Q header</p> Signup and view all the answers

    What is a trunk in the context of VLANs?

    <p>A network link carrying multiple VLANs</p> Signup and view all the answers

    What is the primary purpose of a router in a VLAN?

    <p>To serve as the backbone for network traffic</p> Signup and view all the answers

    Why is tagging necessary when extending a VLAN port group to another device?

    <p>To identify VLANs on the network link</p> Signup and view all the answers

    What is the most commonly used protocol to support VLANs today?

    <p>IEEE 802.1Q</p> Signup and view all the answers

    Why are VLAN port assignment charts or diagrams necessary in wiring closets?

    <p>To indicate VLAN to port associations to technicians</p> Signup and view all the answers

    What type of ports do trunks typically run between?

    <p>Tagged ports of VLAN-aware devices</p> Signup and view all the answers

    What is the purpose of the IEEE 802.1 working group's VLAN multiplexing method?

    <p>To provide multivendor VLAN support</p> Signup and view all the answers

    What is a potential issue with switches in wiring closets?

    <p>They have no built-in method to indicate VLAN to port associations</p> Signup and view all the answers

    What is a common scenario where tagging is used in VLANs?

    <p>When communication occurs between ports on different switches</p> Signup and view all the answers

    What is used as a label in VLAN cross connect (CC or VLAN-XC)?

    <p>S Tag</p> Signup and view all the answers

    What is the command to create a VLAN?

    <p>Switch(config)#vlan 2</p> Signup and view all the answers

    What is the command to name a VLAN?

    <p>Switch(config-vlan)#name CSC</p> Signup and view all the answers

    What is the command to configure an interface as an access port?

    <p>Switch(config-if)#switchport mode access</p> Signup and view all the answers

    What is the command to assign a VLAN to a port?

    <p>Switch(config-if)#switchport access vlan 2</p> Signup and view all the answers

    What is the command to configure multiple ports for a VLAN?

    <p>Switch(config-if-range)#switchport access vlan 2</p> Signup and view all the answers

    What is the command to verify the VLAN configuration?

    <p>Switch#show vlan brief</p> Signup and view all the answers

    What happens when you try to assign a VLAN that does not exist?

    <p>The command is rejected with an error message</p> Signup and view all the answers

    What is the default VLAN name for VLAN 1?

    <p>default</p> Signup and view all the answers

    Study Notes

    VLAN Concept and Introduction

    • A Virtual Local Area Network (VLAN) is a broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2)
    • VLANs work by applying tags to network frames and handling these tags in networking systems, creating the appearance and functionality of network traffic that is physically on a single network but acts as if it is split between separate networks
    • VLANs can keep network applications separate despite being connected to the same physical network, without requiring multiple sets of cabling and networking devices to be deployed

    VLAN Implementation

    • To subdivide a network into VLANs, one configures network equipment
    • Simpler equipment might partition only each physical port, while more sophisticated devices can mark frames through VLAN tagging, allowing a single interconnect (trunk) to transport data for multiple VLANs
    • VLANs can be used to partition a local network into several distinctive segments, such as production, voice over IP, network management, storage area network (SAN), guest internet access, and demilitarized zone (DMZ)
    • A common infrastructure shared across VLAN trunks can provide a measure of security with great flexibility for a comparatively low cost

    VLANs Benefits

    • VLANs address issues such as scalability, security, and network management
    • VLANs provide the flexibility to adapt to changes in network requirements and allow for simplified administration
    • VLANs can keep network applications separate despite being connected to the same physical network
    • VLANs can optimize traffic on trunk links for real-time or low-latency requirements

    VLAN History

    • Dr. W. David Sincoskie invented VLANs by adding a tag to each Ethernet frame, allowing for improved scalability and bandwidth
    • Sincoskie referred to this as a multitree bridge
    • The concept of VLANs was first introduced in the 1980s, and the IEEE 802.1Q standard was published in 1998

    VLAN Trunks

    • A trunk denotes a network link carrying multiple VLANs, which are identified by labels (or tags) inserted into their packets
    • Such trunks must run between tagged ports of VLAN-aware devices, often switch-to-switch or switch-to-router links rather than links to hosts
    • VLAN port assignment charts or diagrams are necessary to indicate VLAN to port associations

    VLAN Protocols and Design

    • The protocol most commonly used today to support VLANs is IEEE 802.1Q
    • Prior to the introduction of the 802.1Q standard, several proprietary protocols existed, such as Cisco Inter-Switch Link (ISL) and 3Com's Virtual LAN Trunk (VLT)
    • VLAN cross connect (CC or VLAN-XC) is a mechanism used to create Switched VLANs, using IEEE 802.1ad frames where the S Tag is used as a Label as in MPLS

    VLAN Configuration

    • To configure a VLAN, one must login to the switch with console and type the commands to create a VLAN, name it, and assign it to ports
    • The commands include switch#configure terminal, switch(config)#vlan 2, switch(config-vlan)#name CSC, switch(config-vlan)#exit, and switch(config)#interface fastEthernet 0/14 for a single port, or switch(config)#int range fastEthernet 0/15-16 for multiple ports
    • The show vlan brief command is used to verify VLANs and their associated ports

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    Related Documents

    ch8.pdf

    Description

    This quiz covers the concepts of VLAN, Virtual Local Area Network, and its configuration. Understand how VLAN divides a single broadcast domain into multiple broadcast domains.

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