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administrator Dynamic VLAN membership is determined by information from the user device, such as its MAC address or 8021x authentication credentials
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VLAN Connections
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An access-link is a connection to another device that supports standard
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Ethernet frames and supports only a single VLAN A trunk is a connection that tags frames and allows multiple VLANs Trunking is supported only on ports that are trunk-capable: not all Ethernet ports support trunking
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IEEE 8021Q is a standardized trunking method The 2960 supports only this
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method The 8021Q method inserts a VLAN tag in the middle of the frame and recomputes the frame s checksum It supports a native VLAN this is a VLAN that is not tagged on the trunk link On Cisco switches, this defaults to VLAN 1
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VTP is used to share VLAN information to ensure that switches have a
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VTP has three modes: server (allowed to make and accept changes, and
propagates changes), transparent (allowed to make changes, ignores VTP messages), and client (accepts changes from servers and doesn t store this in NVRAM) The default mode is server
VTP messages are propagated only across trunks For a switch to accept a
VTP message, the domain name and optional password must match There are three VTP messages: advertisement request (client or server request), subset advertisement (server response to an advertisement), and summary
Two-Minute Drill
advertisement (server sends out every 5 minutes) The configuration revision number is used in the VTP message to determine whether it should be processed or not
VTP pruning allows for the dynamic addition and removal of VLANs on
a trunk based on whether or not there are any active VLANs on a switch Requires switches to be in server and/or client mode
VLAN Configuration
To configure VTP, use the vtp domain command to assign the domain,
the vtp mode command to assign the mode, and vtp password to authenticate VTP messages Use the show vtp status command to verify your VTP configuration
DTP is a Cisco-proprietary protocol that determines whether two interfaces
on connected devices can become a trunk There are five modes: on, desirable, auto-negotiate, off, and no-negotiate If one side s mode is on, desirable, or auto, and the other is on or desirable, a trunk will form Nonegotiate mode enables trunking but disables DTP
To enable trunking on a 2960 s interface, use switchport mode trunk
To verify trunking, use the show interfaces switchport|trunk command
All ports on a switch are automatically placed in VLAN 1 To add a VLAN
on a 2960, use the vlan command To assign an interface to a VLAN, use switchport mode access and switchport access vlan To view your VLANs and the ports assigned to them, use show vlan
13: VLANs and Trunks
SELF TEST
The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question
VLAN Overview
1 Which of the following is false concerning VLANs A B C D A VLAN is a broadcast domain A VLAN is a logical group of users A VLAN is location-dependent A VLAN is a subnet
2 Two groups of users are connected to a switch: sales and marketing You are concerned about marketing and sales people seeing each others traffic What solutions would you use to prevent this (choose two) A B C D VLANs Hubs MAC address filtering Router with ACLs
VLAN Connections
3 A connection that supports multiple VLANs is called a __________ 4 Which of the following is true concerning 8021Q A B C D It supports hub connections It is not supported on the 2960 switches The native VLAN is tagged The original Ethernet frame is not modified
VLAN Trunk Protocol
5 The __________ is a proprietary Cisco protocol used to share VLAN configuration information between Cisco switches on trunk connections
Self Test
6 Which VTP mode(s) will propagate VTP messages A B C D Client and server Server Client, server, and transparent Transparent
7 You have a server switch with VLANs accounting, HR, and executives on one switch with a configuration revision value of 55 and another server switch with VLANs engineering, sales, and marketing with a configuration revision value of 57 Currently the two switches are not connected together You connect them together What can happen (choose two) A If the domain names don t match, nothing occurs B If the domain names don t match, the VLANs on the higher revision switch are used and the other ones are deleted C If the domain names match, the engineering, sales, and marketing VLANs are deleted D If the domain names match, the accounting, HR, and executives VLANs are deleted
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