VLAN & Configuration Quiz
45 Questions
2 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition

Podcast

Play an AI-generated podcast conversation about this lesson

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

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    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.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser