Day 16 - InterVLAN Routing

Question 1

Three options are available when implementing interVLAN routing. What are they?

Answer 1

Traditional or legacy
Router on a stick
Multilayer / Layer 3 switching

Question 2

__________ __________ routing requires multiple physical interfaces on both the router and the switch.

Answer 2

Legacy interVLAN

Question 3

This type of interVLAN routing makes it possible to configure one router interface as multiple trunks by using subinterfaces. The single physical interface is logically subdivided into multiple logical interfaces

Answer 3

Router on a stick

Question 4

What is the most scalable solution when it comes to interVLAN routing? It makes use of a multilayer switch to replace both the router and the switch as was used in Router on a Stick

Answer 4

Multilayer switching

Question 5

As far as interVLAN routing is concerned, multilayer switches perform two functions; what are they?

Answer 5

Switching traffic within the same VLAN
Routing traffic between VLANs

Question 6

Why is multilayer switching more scalable than any other interVLAN routing implementation? Give two examples

Answer 6

Routers have a limited number of available interfaces
One single link can limit bandwidth and amounts of traffic

Question 7

When configuring interVLAN routing using the router on a stick model, the __________ __________ on the router must be connected to a __________ __________ on the adjacent switch

Answer 7

Physical interface
Trunk link

Question 8

For router on a stick, these types of interfaces are created for each unique VLAN on the network

Answer 8

Subinterfaces

Question 9

For router on a stick, each subinterface is assigned a unique what?

Answer 9

IP address

Question 10

For router on a stick, each subinterface is configured to tag __________ for that VLAN

Answer 10

Frames

Question 11

Based on the topology below and assuming the switch is already configured with VLANs and trunking

Configure both VLANs (10 and 30) to use subinterfaces on Gi0/0 on the router

Use the IP addresses in the topology

Answer 11

int gi0/0
no shutdown

int gi0/0.10
encap dot1q 10
ip address 172.17.10.1 255.255.255.0

int gi0/0.30
encap dot1q 30
ip address 172.17.30.1 255.255.255.0

Question 12

What verification commands would you use to verify the configuration for interVLAN (router on a stick) to make sure new networks are in the routing table and the subinterfaces are up and up?

Answer 12

show vlans
show ip route
show ip int brief

Question 13

All Catalyst multilayer switches support what two types of Layer 3 interfaces?

Answer 13

SVIs
Routed ports

Question 14

Solve for definition:

Virtual VLAN interface used for interVLAN routing

Answer 14

SVI (Switched virtual interface)

Question 15

Solve for definition:

Similar to a physical interface on a Cisco IOS router

Answer 15

Routed port

Question 16

How would you create an SVI for VLAN 20 with an IP address of 10.10.20.1 on a multilayer switch?

Answer 16

int vlan 20
no shut
ip address 10.10.20.1 255.255.255.0

Question 17

Based on the topology:

• Enable Layer 3 routing
• Create SVIs for VLANs 10 and 30
• Correctly IP those SVIs
• Put fa0/11 and fa0/6 into the correct VLANs
• Configure the egress port going to the internet to be a routed port based on the IP address
• Configure a default static route that goes out to the internet

Answer 17

ip routing

vlan 10
vlan 30

int vlan 10
ip address 172.17.10.1 255.255.255.0
no shut

int vlan 30
ip address 172.17.30.1 255.255.255.0
no shut

int fa0/11
sw mode acc
sw acc vlan 10

int fa0/6
sw mode acc
sw acc vlan 30

int gi0/1
no switchport
ip address 192.0.2.2 255.255.255.0

ip route 0.0.0.0 0.0.0.0 gi0/1

copy run start

Question 18

Assuming the default switch configuration, which VLAN range can be added, modified, and removed on a Cisco switch?

Answer 18

2 through 1001