VRF

Question 1

VRF stands for:

Answer 1

Virtual Routing and Forwarding

Question 2

What is VRF used for

Answer 2

Dividing a single router into multiple virtual routers, similar to VLANs divide a switch into multiple virtual switches

Question 3

By default, all router interfaces are in the same _____

Answer 3

Routing domain

Question 4

VRF works by allowing the router to build:

Answer 4

Multiple seperate routing tables

Question 5

T/F: Only router interfaces, SVIs, and routed ports on multilayer switches can be configured in a VRF

Answer 5

T

Question 6

T/F: Traffic in one VRF can’t be forwarded out of an interface in another VRF

Answer 6

T

With one exception, VRF leaking can be configured to allow traffic to pass between VRFs. Beyond CCNA scope

Question 7

What is a primary use of VRF?

Answer 7

Used by service providers to allow one device to carry traffic from multiple customers, and keeping each customer’s traffic isolated from the others

Question 8

T/F: VRF allows for overlapping IP subnets/IP addresses to all use the same routing appliance

Answer 8

T

Question 9

T/F: VRF doesn’t allow for overlapping IP subnets/IP addresses to use the same routing appliance

Answer 9

F

This is a primary benefit of VRF

Question 10

T/F: Without the use of VRF, two interfaces on the same router cannot be in the same subnet

Answer 10

T

Question 11

What is the command to create a VRF

Answer 11

ip vrf vrf-name

Question 12

What is the command to show all VRFs on a router

Answer 12

sh ip vrf

Question 13

What is the command to assign a router interface to a VRF

Answer 13

ip vrf forwarding vrf-name

Question 14

T/F: If an interface has an IP address configured, the IP address will be removed when the interface is assigned to a VRF

Answer 14

T

Question 15

T/F: sh ip route displays the global routing table, so if all interfaces are in VRFs, the table will be empty

Answer 15

T

Question 16

What is the command to view the routing table for a particular VRF

Answer 16

sh ip route vrf vrf-name

Question 17

You issue the following commands on R1’s g0/0 interface:
~~~
R1(config)# int g0/0
R1(config-if)# ip addr 192.168.1.1 255.255.255.252
R1(config-if)# ip vrf forwarding VRF1
~~~
However, after issuing sh ip int brief you notice g0/0 doesn’t have an IP address. Why?

a) You must use the command ip address 192.168.1.1 255.255.255.252 vrf VRF1
b) The IP address was removed by the ip vrf forwarding VRF1 command
c) You must use sh ip route vrf VRF1 to view the IP address
d) VRF1 doesn’t exist yet

Answer 17

b) The IP address was removed by the ip vrf forwarding VRF1 command

Question 18

Which of the following statements about VLANs and VRFs are true? (pick 3)

a) VRFs divide routers up by creating separate broadcast domains
b) VLANs divide switches up by creating separate MAC address tables
c) VRFs divide routers up by creating separate routing tables
d) VLANs divide switches up by creating separate broadcast domains
e) VRFs can only be configured on routers
f) Router interfaces in different VRF can have the same IP address

Answer 18

C, D, F