Chapter 5: VLAN Trunks and EtherChannel Bundles Flashcards by Ludwig van Beethoven

List the 4 VTP roles

Server
Client
Transparent
Off

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This switch is responsible for creating, modifying, and deleting VLANs within the VTP domain.

Server

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A switch in what VTP mode receives VTP advertisements and modifies the VLANs on the switch?

Client

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A switch in this VTP mode receives and forwards VTP advertisements but does not modify the local VLAN database.

Transparent

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Default VTP version on Cisco switches.

Version 1

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Which VTP version:

Supports VLANs 1-1005 and Token Ring.

Does not inspect VTP version and domain before forwarding VTP advertisements.

Version 2

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Which VTP version:

Supports extended range VLANs ( 1006-4094), PVLANs, and encrypted passwords.

Can disable VTP per interface

Version 3

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Default VTP domain

Null

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Types of VTP advertisements

Summary
Subset
Client request

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T/F:

VTP advertisements are unicast.

False

Multicast

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When is a summary advertisement sent?

Every 30 seconds by default.

Everytime VLAN database changes.

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What is included in a summary advertisement?

VTP version
VTP Domain
Revision number
Time stamp
MD5 Hash

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When is a subset advertisement sent?

After summary advertisement.

After VLAN configuration change occurs.

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T/F

VTP advertisements are sent non-secure by default.

True

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T/F

VTP advertisements are sent across trunk ports and access ports.

False

Trunk ports only

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Which VTP mode is a Cisco best practice?

Transparent

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What command is used to designate the primary VTP server if there are multiple VTP servers in VTP domain?

vtp primary

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VTP configuration steps

Define VTP version
Define VTP domain
Define VTP switch role
Secure VTP domain with password (optional)

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What command is used to verify VTP status?

show vtp status

What happens to an access port when the VLAN it is assigned to is removed from the switch?

The access port is moved to VLAN1.

What destination MAC are VTP packets sent to?

A. FF:FF:FF:FF:FF:FF
B. 00:00:0c:07:ac:XX
C. 00-00-5E-00-01-1E
D. 01-00-0C-CC-CC-CC

D. 01-00-0C-CC-CC-CC

What is the ‘followers’ field in a summary advertisement?

Indicates if packet is followed by a summary advertisement.

In what situations does a switch need a VTP advertisement request?

The switch has been reset.

The VTP domain name has changed.

The switch has received a VTP summary advertisement with a higher configuration revision than its own.

Used to determine whether the received information is more recent that the current version.

Configuration revision

How to reset configuration revision

Change VTP mode to transparent and change it back. Change domain name.

What type of advertisement occurs when a switch with a lower revision number joins the VTP domain and observes a summary advertisement with a higher revision than it has stored locally.

Client request

What protocol attempts to form a trunk with another interface?

DTP

How often are DTP packets sent?

Every 30 seconds by default

T/F: After you manually configure a port as an access port, the command [switchport nonegotiate] is necessary to disable DTP on access ports.

False. DTP is disabled on switchports manually configured as access ports.

Name the DTP modes

Trunk Dynamic desirable Dynamic auto

This mode statically places the switch port as a trunk and advertises DTP packets to the other end to establish a dynamic trunk.

Trunk

In this mode, the switch port acts as an access port, but it listens for and advertises DTP packets to the other end to establish a dynamic trunk.

Dynamic desirable

In this mode, the switch port acts as an access port, but it listens for and responds to DTP packets.

Dynamic auto

T/F Switches in transparent mode do not need a VTP domain name.

True

What command prevents a port from forming a trunk with a dynamic desirable or dynamic auto switch port?

switchport nonegotiate

Dynamic Link Aggregation protocols

PAgP | LACP

PAgP multicast MAC Address: A. 00-00-5E-00-01-1E B. 0100:0CCC:CCCC C. 0180:C200:0002 D. 01-00-OC-CC-CC-CC

B. 0100:0CCC:CCCC

PAgP protocol code

0x0104

PAgP modes

Auto Desirable [non-silent]

In this PAgP mode, the interface does not initiate an EtherChannel to be established and does not transmit PAgP packets out of it.

Auto

In this PAgP mode, an interface tries to establish an EtherChannel and transmit PAgP packets out of it.

Desirable Active PAgP interfaces can establish a PAgP adjacency only if the remote interface is configured to auto or desirable.

LACP multicast address A. 00-00-5E-00-01-1E B. FFFF:FFFF:FFFF C. 0180:C200:0002 D. 01-00-0C-CC-CC-CC

C. 0180:C200:0002

In this LACP mode, an interface does not initiate an EtherChannel to be established and does not transmit LACP packets out of it.

Passive

In this LACP mode, an interface tries to establish an EtherChannel and transmit LACP packets out of it.

Active

T/F Ports with different native VLANs can form an etherchannel.

False

What is PAgP silent mode?

Default PAgP mode. Allows a port to establish an EtherChannel with a device that is not PAgP capable and rarely sends packets.