Module 4

Question 1

What is the main objective of the module on Inter-VLAN Routing?

Answer 1

Troubleshoot inter-VLAN routing on Layer 3 devices.

Question 2

What are the three options for inter-VLAN routing?

Answer 2

• Legacy Inter-VLAN routing
• Router-on-a-Stick
• Layer 3 switch using switched virtual interfaces (SVIs)

Question 3

What is required for Router-on-a-Stick inter-VLAN routing?

Answer 3

Create a subinterface for each VLAN to be routed.

Question 4

What command is used to create a subinterface in Router-on-a-Stick configuration?

Answer 4

interface interface_id.subinterface_id

Question 5

What does the command ‘encapsulation dot1q vlan_id’ do?

Answer 5

Configures the subinterface to respond to 802.1Q encapsulated traffic from the specified VLAN.

Question 6

What command assigns an IP address to a subinterface in Router-on-a-Stick?

Answer 6

ip address ip-address subnet-mask

Question 7

What must be done after creating all subinterfaces in Router-on-a-Stick?

Answer 7

Enable the physical interface using the ‘no shutdown’ command.

Question 8

How do you verify connectivity between two hosts in different VLANs?

Answer 8

Use the ‘ping’ command.

Question 9

List the commands used to verify and troubleshoot Router-on-a-Stick configuration.

Answer 9

• show ip route
• show ip interface brief
• show interfaces
• show interfaces trunk

Question 10

What are the advantages of using Layer 3 switches for inter-VLAN routing?

Answer 10

• Faster processing rates
• No need for external links to a router
• Not limited to one link due to EtherChannels
• Lower latency
• Commonly deployed in campus LANs

Question 11

What is an SVI?

Answer 11

A switched virtual interface configured on a Layer 3 switch.

Question 12

What command is used to enable IP routing on a Layer 3 switch?

Answer 12

ip routing

Question 13

What is the limitation of the legacy inter-VLAN routing method?

Answer 13

Not reasonably scalable due to the limited number of physical interfaces on routers.

Question 14

Is the router-on-a-stick method scalable beyond 50 VLANs?

Answer 14

False.

Question 15

What is the first step in configuring a Layer 3 switch for inter-VLAN routing?

Answer 15

Create the VLANs.

Question 16

Fill in the blank: The router-on-a-stick method requires a ______ for each VLAN to be routed.

Answer 16

subinterface

Question 17

True or False: Layer 3 switches operate only at Layer 2.

Answer 17

False.

Question 18

What is the primary function of an SVI?

Answer 18

Provides Layer 3 processing for packets sent to or from switch ports associated with that VLAN.

Question 19

What command is used to create an SVI for a VLAN?

Answer 19

interface vlan vlan-id

Question 20

What is required to configure trunking ports on a switch?

Answer 20

Configure trunking ports after creating VLANs and access ports.

Question 21

What is the primary function of Layer 3 switches in enterprise campus LANs?

Answer 21

To provide inter-VLAN routing

Question 22

How do Layer 3 switches achieve higher packet processing rates than routers?

Answer 22

By using hardware-based switching

Question 23

What command is used to create a switched virtual interface (SVI) on a Layer 3 switch?

Answer 23

interface vlan vlan-id

Question 24

What must be configured on a Layer 3 switch to enable routing?

Answer 24

A routed port must be configured

Question 25

What command disables the switchport feature on a Layer 2 port?

Answer 25

no switchport

Question 26

What are the steps to configure a Layer 3 switch to route with a router?

Answer 26

* Configure the routed port * Enable routing * Configure routing * Verify routing * Verify connectivity

Question 27

What are common reasons for inter-VLAN configuration failures?

Answer 27

* Missing VLANs * Switch trunk port issues * Switch access port issues * Router configuration issues

Question 28

What is a common cause of issues in a router-on-a-stick configuration?

Answer 28

Misconfigured trunk port

Question 29

Which command can be used to verify the subinterface status in a router-on-a-stick configuration?

Answer 29

show ip interface brief

Question 30

When troubleshooting switch access port issues, which command can help verify interface VLAN assignment?

Answer 30

show vlan brief

Question 31

What command is used to enable routing on a Layer 3 switch?

Answer 31

ip routing

Question 32

What is the command to verify the routing table on a Layer 3 switch?

Answer 32

show ip route

Question 33

What is the purpose of the command 'encapsulation dot1q X [native]'?

Answer 33

To configure subinterfaces for VLANs on a router

Question 34

Fill in the blank: A _______ is created on a Layer 3 switch by disabling the switchport feature on a Layer 2 port.

Answer 34

routed port

Question 35

True or False: In a legacy inter-VLAN solution, a misconfigured switch port could be caused when the connecting router port is not assigned to the correct VLAN.

Answer 35

True

Question 36

What command can be used to verify VLAN membership of a port?

Answer 36

show interfaces switchport

Question 37

What is the first step to troubleshoot inter-VLAN routing issues?

Answer 37

Check the physical layer for cable connections

Question 38

What happens to ports assigned to a VLAN when that VLAN is deleted?

Answer 38

They become inactive until reassigned to a new VLAN

Question 39

What should be checked if the port connecting to the router is missing from the trunk output?

Answer 39

Examine the configuration of the port using show running-config interface X

Question 40

What is required for VLANs to be reachable by other Layer 3 devices?

Answer 40

They must be advertised using static or dynamic routing