VLANs

Question 1

what is a lan

Answer 1

broadcast domain

Question 2

vlans allow you to

Answer 2

split a a switch into multiple broadcast domains

Question 3

why have vlans

Answer 3

performance
security
less hosts receive broadcast frames
flexible designs

Question 4

this is needed to use vlans over multiple switches

Answer 4

trunking

Question 5

trunking adds this to the frame

Answer 5

header with vlan id

Question 6

how to configure int with vlan

Answer 6

switchport access vlan 3

Question 7

set interface to only access

Answer 7

switchport mode access

Question 8

show vlans, ports status

Answer 8

show vlan brief

Question 9

configure a range of ints with vlans

Answer 9

int range fa 0/13-14

switchport access vlan 3

Question 10

enable trunk mode on a port

Answer 10

switchport mode trunk

Question 11

interface mode table

Answer 11

A Da T Dd
A A   X  A
A A   T   T
X T   T   T
A T   T   T

Question 12

IP phones have these embedded

Answer 12

mini switch with 2 vlans

Question 13

2 vlans in an ip phone

Answer 13

data vlan for end device

voice vlan for phone traffic

Question 14

once in conf t - int gig 0/2, commands to config data and voice vlans

Answer 14

switchport mode access
switchport access vlan 10
switchport voice vlan 11

Question 15

command to verify interface configs

Answer 15

show interfaces Fa 0/4 switchport

Question 16

show trunk interfaces

Answer 16

show interfaces trunk

Question 17

does voice vlan appear as a trunk interface

Answer 17

no

Question 18

show all vlan and status

Answer 18

show vlan

Question 19

steps to troubleshoot vlan

Answer 19

check they are allowed, defined,active
check both ends vlan lists
check trunk admin modes
check both ends native vlan settings

Question 20

what happens when one int is trunk but destination interface isnt

Answer 20

destination drops all non native frames, accepting native because it is untagged

Question 21

view allowed vlan list

Answer 21

switchport trunk allowed vlan