Network Basics: VLANs and Routers Quiz
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Questions and Answers

What is the primary role of a router in a network?

  • To provide network access to end devices
  • To create virtual local area networks (VLANs)
  • To move information between networks (correct)
  • To segment broadcast domains

    • How do VLANs affect broadcast domains?

  • They merge multiple broadcast domains into one
  • They have no impact on broadcast domains
  • They increase the size of broadcast domains
  • They separate large broadcast domains into smaller ones (correct)

    • Which device typically provides access to a LAN?

  • A router
  • An access layer switch (correct)
  • A Layer 3 switch
  • A modem

    • What is required to allow traffic to move between different VLANs?

    <p>A Layer 3 routing process</p> Signup and view all the answers

    What is a key advantage of using VLANs in network design?

    <p>They allow segmentation based on various organizational factors</p> Signup and view all the answers

    What might be a limitation of using a traditional router for inter-VLAN routing?

    <p>It can have a limited number of LAN interfaces</p> Signup and view all the answers

    In what scenario are VLANs primarily used?

    <p>Within switched local area networks</p> Signup and view all the answers

    What is the function of a Layer 3 device in relation to VLANs?

    <p>To route traffic between VLAN segments</p> Signup and view all the answers

    What is a key characteristic of VLANs in a Layer 2 network?

    <p>VLANs enable specific access and security policies based on user groupings.</p> Signup and view all the answers

    Which type of VLAN is used primarily for untagged traffic?

    <p>Native VLAN</p> Signup and view all the answers

    What happens when a broadcast frame is sent in a VLAN?

    <p>It is limited to the specific VLAN only.</p> Signup and view all the answers

    Which statement about VLAN trunks is accurate?

    <p>A VLAN trunk supports communication for devices in the same VLAN across different switches.</p> Signup and view all the answers

    In a default configuration, which VLAN do all switch ports belong to?

    <p>VLAN 1</p> Signup and view all the answers

    What is the function of the Management VLAN?

    <p>To access the management capabilities of network devices.</p> Signup and view all the answers

    Which command can be used to view VLAN configurations on a switch?

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

    What role do switches play in the partitioning of VLANs?

    <p>Switches act to isolate the hosts within a VLAN from VLAN awareness.</p> Signup and view all the answers

    Why is it critical for each VLAN to correspond to a unique IP subnet?

    <p>To ensure devices can communicate within the same VLAN</p> Signup and view all the answers

    What is the most common result of a native VLAN mismatch?

    <p>Unintended security risks</p> Signup and view all the answers

    What is the effect of trunk mode mismatches?

    <p>Loss of network connectivity</p> Signup and view all the answers

    What does inter-VLAN routing enable?

    <p>Direct communication between devices on separate VLANs</p> Signup and view all the answers

    Which Layer 2 switch feature is primarily insufficient for handling large VLANs?

    <p>Dynamic routing capability</p> Signup and view all the answers

    What causes unexpected or no traffic to be sent over a trunk?

    <p>Allowed VLANs on Trunks configuration issues</p> Signup and view all the answers

    Which component can be used to perform inter-VLAN routing?

    <p>A router or multilayer switch</p> Signup and view all the answers

    What is the key role of VLANs in a network?

    <p>To segment a switched network into separate broadcast domains</p> Signup and view all the answers

    What command is used to assign a port to a specific VLAN?

    <p>switchport access vlan vlan_id</p> Signup and view all the answers

    What must be done before deleting a VLAN to ensure network stability?

    <p>Reassign all member ports to a different VLAN</p> Signup and view all the answers

    Which command would display a summary of all VLANs on the switch?

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

    What is the effect of using the command 'delete flash:vlan.dat' on the switch?

    <p>It resets the switch to factory settings</p> Signup and view all the answers

    What command would you use to verify if VLAN 20 has been deleted?

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

    What range of VLAN IDs is allowed when using VLAN commands?

    <p>1 to 4094</p> Signup and view all the answers

    What condition must be met before using the command 'erase startup-config'?

    <p>The 'delete flash:vlan.dat' command must be issued first</p> Signup and view all the answers

    Which command provides operational status for a specific switch port?

    <p>show interfaces switchport</p> Signup and view all the answers

    What is the primary purpose of frame tagging in VLANs?

    <p>To identify which VLAN the frame belongs to</p> Signup and view all the answers

    What happens to control traffic sent on the native VLAN?

    <p>It remains untagged and is placed in the native VLAN</p> Signup and view all the answers

    Which VLAN range is supported by Cisco Catalyst 2960 and 3560 Series switches?

    <p>1 to 4,096</p> Signup and view all the answers

    What must be done to properly configure a switch port to be assigned to a VLAN?

    <p>Set the port to access mode</p> Signup and view all the answers

    What is the default native VLAN on Cisco switches?

    <p>VLAN 1</p> Signup and view all the answers

    Which of the following is true about Extended Range VLANs?

    <p>They range from 1,006 to 4,096</p> Signup and view all the answers

    Which command is used to create a VLAN in Cisco IOS?

    <p>vlan vlan-id</p> Signup and view all the answers

    What is the role of trunk links in VLAN configurations?

    <p>To allow multiple VLAN frames to travel between switches</p> Signup and view all the answers

    What command would you use on S1 to display all configured VLANs?

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

    Why are PC1 and PC4 unable to ping each other despite being on the same VLAN?

    <p>Both ports are assigned to VLAN 1 by default.</p> Signup and view all the answers

    Which VLAN has been configured as the native VLAN on S1 for trunking?

    <p>VLAN 99</p> Signup and view all the answers

    What command should you issue on S2 and S3 to confirm trunking is enabled?

    <p>show interface trunk</p> Signup and view all the answers

    To correct a native VLAN mismatch on S2 and S3, which VLAN should be configured?

    <p>VLAN 99</p> Signup and view all the answers

    What is the subnet mask for VLAN 10 devices?

    <p>255.255.255.0</p> Signup and view all the answers

    What must be configured on the interfaces G0/1 and G0/2 on S1 for proper trunking?

    <p>Enable trunk mode</p> Signup and view all the answers

    Which command will you use to verify the native VLAN configuration on S2 and S3 after making changes?

    <p>show interface switchport</p> Signup and view all the answers

    Study Notes

    Networking Protocols Lab - Course Plan

    • College: Faculty of Engineering Technology
    • Department: Computer and Networks Engineering
    • Course Title: Networks Protocols lab
    • Course Code: 30106432
    • Credit Hours: 1
    • Prerequisite: 30106431
    • Instructor: Dr. Belal Ayyoub
    • Office No.: B17 F4
    • Email: [email protected]
    • Class Times: Tuesdays - Wednesdays: 16:00-18:00 ; Sundays - Tuesdays: 10:00-11:00

    Lab 7: VLANs and Inter-VLAN Routing

    • Network Performance: Important factor in organization productivity
    • VLANs (Virtual Local Area Networks): Technologies used to separate large broadcast domains into smaller ones, reducing broadcast traffic. VLANs segment the network
    • Access Layer Switch: Role of providing access to a LAN
    • Layer 2 Switch: VLANs are commonly incorporated into network design for easier network support.
    • Layer 3 Device (e.g. Router): Needed to allow traffic to move between network segments
    • VLAN Definitions: Networks divided by function, project team, or application. Enable implementation of customized access and security policies according to user groups
    • VLAN Example: Third floor IT (10.0.2.0/24), Second floor HR (10.0.3.0/24), First floor Sales (10.0.4.0/24)
    • Types of VLANs:
      • Data VLAN: User-generated traffic
      • Default VLAN: All switch ports until configured
      • Native VLAN: Untagged traffic
      • Management VLAN: Access management capabilities
    • Multi-VLAN coexistence: Multiple VLANs can exist on one switch.
    • VLAN separation: VLANs are mutually isolated, and packets can't travel between them without a router.
    • VLAN implementation: VLANs are implemented using Layer 2 devices, usually switches, to partition broadcast domains.
    • VLANs and Broadcast Domains: VLANs provide smaller broadcast domains, controlling the impact of broadcasts.

    Controlling Broadcast Domains with VLANs

    • Broadcast Frame Control: VLANs confine broadcast frames within a specific VLAN, limiting their impact
    • Unicast and Multicast traffic: These types of network traffic are kept within their originating VLAN
    • VLAN segmentation benefits: Controlling network traffic, increasing efficiency

    VLANs in a Multi-Switched Environment

    • Native VLAN: Default VLAN for untagged traffic. It is important to configure VLAN on those devices so that it works correctly.
    • VLAN Tagging Process of adding a VLAN identification header to a frame
    • VLAN tagging uses: Properly transmits multiple VLAN frames through a trunk link. Enables consistent tagging of frames

    Voice VLAN Tagging

    • Voice VLAN use case: Switch port configured to support voice traffic
    • Voice VLAN prioritisation: Prioritizes voice traffic

    Packet Tracer - Investigating a VLAN Implementation

    • Topology: Diagram or configuration of network devices and their connections (includes addresses)
    • Addressing Table Table that identifies devices, their interfaces, IP addresses, subnet masks and default gateways (e.g. S1, VLAN 99, 172.17.99.31, 255.255.255.0, N/A).

    Objectives

    • Observe Broadcast Traffic in a VLAN implementation, observe broadcast traffic without VLANs
    • Reflection Questions: Detailed questions addressing the implications and configurations of VLANs.

    VLAN Ranges

    • Cisco Catalyst: Supports over 4000 VLANs
    • VLAN Numbers:
      • Normal Range: 1-1005 (including FDDI, and Token Ring)
      • Extended Range: 1006-4094

    VLAN Configuration Commands

    • Global configuration mode: enter global configuration mode e.g. configure terminal
    • Interface configuration mode: enter interface configuration mode interface interface_id
    • Switchport mode access: Sets a port to access mode switchport mode access
    • Switchport access vlan: Assigns the port to a VLAN switchport access vlan vlan_id
    • No vlan vlan-id: Removes VLAN from that network no vlan vlan_id
    • Show vlan brief: Displays VLAN name, status, and associated ports.
    • Show interfaces interface-id: Displays interface information (including VLAN configuration in that interface).
    • Other Commands: Other commands for controlling interfaces depending on required configurations.

    Deleting VLANs

    • Caution: Before deleting a VLAN, ports should be reassigned to a different VLAN first.
    • Deleting stored file: delete flash:vlan.dat
    • Restarting Required after deleting configurations

    VLAN Trunks

    • Trunk Ports: Connect to other switches. Enable communications across different VLANs.
    • IEEE 802.1Q: A popular trunk protocol
    • VLAN Trunk: A point-to-point link that carries more than one VLAN

    Inter-VLAN Routing

    • Routing Device (e.g. Router): Needed to allow traffic from one VLAN to another
    • Legacy Inter-VLAN routing: VLANs are connected to separate physical interfaces on a router; forwarding traffic
    • Router-on-a-Stick: One interface connected to a router acts as a 'trunk', multiple logical interfaces to multiple VLANs
    • Advantages of different types of inter-VLAN Different routing configurations have varying routing performances, use cases and support multiple VLANs

    Addressing Issues

    • IP Subnets: Each VLAN needs its own IP subnet

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    Networking Protocols Lab - Week 8 - Faculty of Engineering Technology

    Description

    Test your knowledge on the roles of routers and VLANs in a network environment. This quiz explores key concepts such as broadcast domains, inter-VLAN routing, and the function of Layer 3 devices. Perfect for students and professionals looking to benchmark their networking skills.

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