Link Aggregation Protocols: LACP & PAgP
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Link Aggregation Protocols: LACP & PAgP

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Questions and Answers

What command is used to confirm that the EtherChannel has been successfully established?

  • show etherchannel summary (correct)
  • show link-status
  • show port-channel
  • show ethernet status

    • In a static VLAN configuration, what happens when a device is connected to a specific port?

  • It will only communicate with devices in VLAN 1.
  • It can dynamically change VLANs based on traffic.
  • It automatically assigns VLANs based on MAC addresses.
  • It requires manual reassignment if moved to another port. (correct)

    • Which mode in EtherChannel configuration is indicated to be active in the command?

  • active (correct)
  • passive
  • aggressive
  • standby

    • What is a primary disadvantage of using static VLANs?

    <p>They require frequent adjustments for device mobility.</p> Signup and view all the answers

    What is the primary role of the VLAN Management Policy Server (VMPS) in Dynamic VLAN Assignment?

    <p>To determine the appropriate VLAN based on the device’s MAC address.</p> Signup and view all the answers

    How is VLAN membership determined in dynamic VLANs?

    <p>Automatically based on the device’s MAC address.</p> Signup and view all the answers

    Which of the following is NOT an advantage of Dynamic VLAN Assignment?

    <p>Is simple to set up compared to static VLANs.</p> Signup and view all the answers

    What command would you use to set VLAN access on a switch port?

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

    Why is proper VLAN management important in a network?

    <p>It ensures effective segmentation and secure operation.</p> Signup and view all the answers

    What advantage does static VLAN membership offer for small networks?

    <p>Facilitates straightforward control over device assignments.</p> Signup and view all the answers

    Which of the following commands is used to configure the trunk mode for an EtherChannel?

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

    What is the function of trunk links in VLAN management?

    <p>To enable traffic from multiple VLANs to pass between switches.</p> Signup and view all the answers

    Which of the following documentation is critical for VLAN management?

    <p>VLAN IDs, names, and associated ports.</p> Signup and view all the answers

    Which protocol helps manage VLAN configuration across a network of multiple switches?

    <p>VTP (VLAN Trunking Protocol)</p> Signup and view all the answers

    What is one of the main disadvantages of using Dynamic VLAN Assignment?

    <p>It requires a VLAN Management Policy Server (VMPS).</p> Signup and view all the answers

    What is a key characteristic for naming VLANs effectively?

    <p>Names should clearly describe the VLAN's purpose.</p> Signup and view all the answers

    What is the primary function of LACP?

    <p>To aggregate multiple physical links into a single logical link.</p> Signup and view all the answers

    Which mode of LACP requires the switch to actively send LACP packets?

    <p>Active Mode</p> Signup and view all the answers

    What is the primary difference between PAgP and LACP?

    <p>PAgP is proprietary to Cisco, while LACP is an open standard.</p> Signup and view all the answers

    Which PAgP mode allows a port to form an EtherChannel only if it receives packets from another port in desirable mode?

    <p>Auto Mode</p> Signup and view all the answers

    What is the first step in configuring link aggregation on switches?

    <p>Choose the interfaces for aggregation.</p> Signup and view all the answers

    In the configuration example for LACP, which command assigns interfaces to the channel group?

    <p>Switch(config-if-range)# channel-group 1 mode desirable</p> Signup and view all the answers

    What happens when both ends of a link agree in PAgP?

    <p>An EtherChannel is formed automatically.</p> Signup and view all the answers

    Which feature ensures that both switches agree on the links being aggregated in LACP?

    <p>Exchange of LACP Data Units (LACPDUs).</p> Signup and view all the answers

    What is the command used to set the switch to VTP server mode?

    <p>vtp mode server</p> Signup and view all the answers

    Why is it important to set a VTP domain name?

    <p>To share VLAN information among switches</p> Signup and view all the answers

    Which command is used to create a VLAN on the VTP server?

    <p>vlan 10</p> Signup and view all the answers

    What must be true about the VTP password on client switches?

    <p>It must match the server's password</p> Signup and view all the answers

    How can you verify that VLANs created on Switch 1 have been propagated to Switch 2?

    <p>By using the command 'show vlan brief' on Switch 2</p> Signup and view all the answers

    What command do you use to set the VTP domain name for Switch 1?

    <p>vtp domain NetworkDomain</p> Signup and view all the answers

    Which of the following configuration steps is necessary to configure VTP on a switch?

    <p>Configuring a trunk link on the correct interface</p> Signup and view all the answers

    What does the command 'switchport trunk allowed vlan all' do?

    <p>Allows all VLANs to be transmitted over a trunk link</p> Signup and view all the answers

    What is the main function of routing?

    <p>To enable communication between different networks.</p> Signup and view all the answers

    Which of the following is a disadvantage of static routing?

    <p>Manual configuration can be time-consuming.</p> Signup and view all the answers

    Which command is typically used to configure static routing on a router?

    <p>Router(config)# ip route</p> Signup and view all the answers

    What is a primary feature of dynamic routing?

    <p>Routes are determined automatically based on network state.</p> Signup and view all the answers

    What is the maximum number of hops allowed in RIP?

    <p>15 hops</p> Signup and view all the answers

    Which of the following routing protocols is classified as a distance-vector protocol?

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

    Which routing protocol is considered efficient for larger networks?

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

    What is a key difference between static and dynamic routing?

    <p>Dynamic routing is scalable and adjusts to network changes.</p> Signup and view all the answers

    Study Notes

    Link Aggregation - LACP and PAgP

    • Link Aggregation Control Protocol (LACP) is an open standard defined by IEEE 802.3ad. It combines multiple physical Ethernet links into a single logical link.
    • LACP uses LACP Data Units (LACPDUs) to negotiate which links will be active.
    • PAgP (Port Aggregation Protocol) is a Cisco proprietary protocol that automatically negotiates EtherChannel formation between Cisco devices.
    • PAgP uses PAgP packets to manage EtherChannel, similar to LACP.
    • LACP Modes:
      • Active Mode: Port actively sends LACP packets to form an EtherChannel.
      • Passive Mode: Port forms an EtherChannel only upon receiving LACP packets from a device in active mode.
    • PAgP Modes:
      • Desirable Mode: Port actively sends PAgP packets to negotiate an EtherChannel.
      • Auto Mode: Port forms an EtherChannel only when receiving PAgP packets from a port in desirable mode.
    • Step 1: Choose interfaces for aggregation: Select physical interfaces (e.g., FastEthernet or GigabitEthernet ports).
    • Step 2: Create EtherChannel group: Assign selected interfaces to a channel group using LACP or PAgP protocols.
    • Step 3: Set port-channel interface: Configure the logical port-channel interface as either trunk or access, depending on network requirements.
    • Step 4: Verify configuration: Use commands like show etherchannel summary or show port-channel to confirm the EtherChannel's functionality.

    VLAN Membership

    • VLAN Membership: Defines how devices are assigned to VLANs.
    • Static VLAN Membership:
      • Devices are manually assigned to a VLAN by configuring their connected switch port.
      • Also known as port-based VLAN configuration.
    • Static VLAN Advantages:
      • Simple configuration for small networks.
      • High control over VLAN assignments.
    • Static VLAN Disadvantages:
      • Not scalable for large networks.
      • Requires manual configuration if devices change locations.
    • Dynamic VLAN Membership:
      • VLAN assignments are determined automatically based on device's MAC address.
      • Requires a VLAN Management Policy Server (VMPS).
    • Dynamic VLAN Advantages:
      • Ideal for environments with frequent device movement.
      • Reduces manual configuration.
    • Dynamic VLAN Disadvantages:
      • More complex setup than static VLANs.
      • Requires a VMPS server, adding cost and complexity.

    VLAN Management

    • VLAN Management: Configuring, monitoring, and maintaining VLANs.
    • VLAN Naming and Documentation:
      • Each VLAN should have a clear, descriptive name.
      • Document VLAN configuration, including VLAN IDs, names, associated ports, dynamic policies.
    • VLAN Trunking and Management Across Switches:
      • Trunk Links: Allow traffic from multiple VLANs to pass between switches using 802.1Q VLAN tagging.
      • VLAN configurations must be consistent across switches using protocols like VTP (VLAN Trunking Protocol) for management across the entire network.

    VTP Configuration

    • Configure Switch 1 as VTP Server:

      • Set switch to VTP Server mode (default, but set explicitly).
      • Set VTP domain name.
      • Set optional VTP password.
      • Create VLANs on the server.
      • Configure the trunk link on the interface connecting to the client switch.

    • Configure Switch 2 as VTP Client:

      • Set switch to VTP Client mode.
      • Set the same VTP domain name as the Server.
      • Set the same VTP password as the Server.
      • Configure the trunk link on the interface connecting to the Server switch.

    • Verify VTP Configuration:

      • On the client switch, check if the VLANs created on the server have been propagated.
      • Use commands like show vlan brief, show vtp status to verify VTP status on both switches.

    Dynamic Routing

    • Routing: Enables communication between networks, ensuring data reaches the correct destination.
    • Router: Forwards data packets between networks.
    • Routing Table: Stores routes to network destinations.
    • Static Routing:
      • Routes are manually configured by the network administrator.
      • The router follows a predefined path for forwarding packets.
    • Static Routing Advantages:
      • Simple for small networks.
      • Full control over data paths.
    • Static Routing Disadvantages:
      • Time-consuming for large networks.
      • Lack of adaptability to network changes.
    • Dynamic Routing:
      • Routers automatically learn and adjust to network changes using routing protocols.
    • Dynamic Routing Advantages:
      • Adapts to network changes (e.g., link failures).
      • Scalable for large networks.
    • Dynamic Routing Disadvantages:
      • More complex than static routing.
      • Requires processing and network resources.

    Overview of Routing Protocols

    • RIP (Routing Information Protocol):
      • Distance-vector protocol.
      • Metric: Hop count (maximum of 15 hops).
      • Features: Simple configuration, less efficient for large networks due to hop count limitation.
      • Versions: RIP v1 (classful), RIP v2 (classless, supports subnet masks).
    • OSPF (Open Shortest Path First):
      • Link-state protocol.
      • Metric: Cost, based on bandwidth.
      • Features: Efficient for larger networks, provides fast convergence.

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    Description

    This quiz covers the fundamentals of Link Aggregation Control Protocol (LACP) and Port Aggregation Protocol (PAgP), including their definitions, modes of operation, and configuration. Test your knowledge on how these protocols combine multiple Ethernet links into a single logical connection and their specific functionalities related to Cisco devices.

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