Day 3 - Trunking, DTP, and Inter-VLAN Routing

Question 1

What is DTP?

Answer 1

Dynamic Trunking Protocol

Question 2

Define a trunk

Answer 2

A trunk is a switch port that can carry multiple traffic types, each tagged with a unique VLAN ID.

Question 3

What is the first configuration task when implementing VLAN trunking?

Answer 3

To configure the desired interface as a Layer 2 switch port.

Question 4

What is the command to configure an interface as a Layer 2 switch port?

Answer 4

the switchport command

Question 5

When is the switchport command required?

Answer 5

on Layer 3 capable switches

Question 6

What is the second configuration task when implementing VLAN trunking?

Answer 6

Specify the encapsulation protocol.

Question 7

What is the command to specify the encapsulation protocol for a trunk link?

Answer 7

switchport trunk encapsulation [option]

Question 8

What are the three options for the switchport trunk encapsulation command?

Answer 8

dot1q
isl
negotiate

Question 9

What is dot1q encapsulation?

Answer 9

forces the switch to use IEEE 802.1Q encapsulation.

Question 10

What is isl encapsulation?

Answer 10

forces the switch to use ciscos ISL encapsulation

Question 11

What is negotiate encapsulation?

Answer 11

specifies that if Dynamic Inter-Switch LInk Protocol (DISL) and the Dynamic Trunking Protocol (DTP) negotiation fails to agree on the encapsulation, then ISL is the selected format.

Question 12

What is DISL?

Answer 12

Dynamic Inter-Switch Link protocol

Question 13

What is DTP?

Answer 13

Dynamic Trunking Protocol

Question 14

What command would you use to validate proper trunking configuration?

Answer 14

show interface [name]

Question 15

What is the third trunk port configuration step?

Answer 15

to implement configuration to ensure that the port is designated as a trunk port.

Question 16

What are the two ways to designate a port as a trunk port?

Answer 16

Manual (static) trunk configuration

Dynamic Trunking Protocol (DTP)

Question 17

What is the command for manual configuration of a port for trunking?

Answer 17

switchport mode trunk

Question 18

What command would you use to validate manual port trunking configuration?

Answer 18

show interfaces [name] switchport

Question 19

It is a good practice to disable the sending of DISL and DTP packets on a statically configured trunk port. What is the command to do this?

Answer 19

switchport nonegotiate

Question 20

What are the two DTP modes that a switch port can use?

Answer 20

Dynamic desirable

Dynamic auto

Question 21

If two switches are each set to dynamic auto will they establish a trunk between them or not?

Answer 21

they will not because dynamic auto mode is passive

Question 22

What is the command to see dynamic trunking protocol information both globally and for a specific interface?

Answer 22

show dtp

show dtp [interface ]

Question 23

What is the command to change the default native VLAN?

Answer 23

switchport trunk native vlan [number]

Question 24

Routing traffic between different VLANs is know as?

Answer 24

inter-VLAN routing

Question 25

What are the three methods of implementing inter-VLAN routing?

Answer 25

using physical router interfaces using router subinterfaces using switched virtual interfaces

Question 26

What are the pros and cons of using physical router interfaces to implement inter-VLAN routing?

Answer 26

simple and easy to implement not scalable

Question 27

What are the pros and cons of using router subinterfaces to implement inter-VLAN routing?

Answer 27

scalable, only one physical router interface is required physical interface bandwidth is shared and can become a bottleneck

Question 28

Do routers and switches support DTP?

Answer 28

Only switches support DTP.

Question 29

Inter-VLAN routing using a single router interface is also referred to as ?

Answer 29

router-on-a-stick

Question 30

What type of switch supports the configuration of IP addressing on physical interfaces?

Answer 30

Multilayer or Layer 3 switches

Question 31

SVIs are ?

Answer 31

Switched Virtual Interfaces

Question 32

What command is used to allow the configuration of IP addressing on physical switch interfaces?

Answer 32

no switchport

Question 33

What type of switch supports SVIs?

Answer 33

Multilayer or Layer 3 switches

Question 34

Define SVIs

Answer 34

logical interfaces that represent a VLAN

Question 35

SVIs are automatically created when a Layer 2 VLAN is created. True or False?

Answer 35

False

Question 36

What is the command to configure an SVI?

Answer 36

interface vlan [number]

Question 37

When using Multilayer switches what is the recommended method for configuring an inter-VLAN routing solution?

Answer 37

SVIs

Question 38

What are the two commands that can verify that SVI is properly configured?

Answer 38

show interface vlan [number] show interface [number]

Question 39

What is SDM?

Answer 39

Switch Database Management

Question 40

What are the SDM options on a 2960 switch?

Answer 40

Default Dual IPv4/IPv6 Lanbase-routing QoS

Question 41

What are the Switch Database Management commands?

Answer 41

(config) smd prefer [option] show sdm prefer

Question 42

What is VTP?

Answer 42

VLAN Trunking Protocol

Question 43

What does VTP manage?

Answer 43

the addition, deletion and renaming of VLANs on switches in the same VTP domain

Question 44

What are some of the benefits of using VTP?

Answer 44

Accurate monitoring and reporting of VLANS VLAN consistency across the network Ease of adding and removing VLANs

Question 45

What are the available VTP modes and which is the default?

Answer 45

Server (default) Client Transparent

Question 46

Describe VTP Server mode

Answer 46

the switch is authorized to create, modify and delete VLAN information for the entire VLAN domain

Question 47

Describe VTP Client mode

Answer 47

the switch will receive VTP information and apply any changes, but it does not allow adding, removing or changing VLNAN information on the switch

Question 48

Describe VTP Transparent mode

Answer 48

the switch will forward the VTP information received out of its trunk ports, but it will not apply the changes.

Question 49

What is the command to stop unnecessary VLAN information on switches in a VTP domain?

Answer 49

vtp pruning

Question 50

What is the command to check VTP configuration?

Answer 50

show vtp status

Question 51

How do you reset the VTP revision number on a switch?

Answer 51

change the VTP domain name and then change the name back to the original name

Question 52

What is the command to change or set the VTP domain?

Answer 52

(config) vtp domain [name]

Question 53

If inter-VLAN routing is not working how should you troubleshoot?

Answer 53

* check to see that the link between the switches and routers is setup correctly * check that the relevant VLANs are allowed * check that the router's subinterfaces are configured with the correct encapsulation and VLAN and that the subinterface's IP is the default gateway for the hosts

Question 54

If VLANs cannot be created how should you troubleshoot?

Answer 54

* check whether the VTP mode on the switch is set to client | * check to see if you have exceeded the number of VLANs allowed on the switch

Question 55

Host within the same VLAN cannot reach each other, how should you troubleshoot?

Answer 55

* check that the hosts in the VLAN have IPs belonging to the same subnet * if the hosts are not connected to the same switch, ensure that trunk links between the switches are working correctly

Question 56

If VTP information is not reaching the client what should you check and what are the commands?

Answer 56

that the correct VTP domain and password have been configured using show VTP status and show vtp password