Day 24 - HSRP

Question 1

What does FHRP stand for?

Answer 1

First Hop Redundancy Protocol

Question 2

What is FHRP?

Answer 2

A first hop redundancy protocol which is designed to protect the default gateway used on a network by allowing two or more routers to provide backup for it

Question 3

What is the most popular FHRP?

Answer 3

HSRP (Hot Standby/Swap Router Protocol)

Question 4

With HSRP, do the routers being used with the protocol have actual IP addresses on their physical links?

Answer 4

Yes

Question 5

How are HSRP routers elected under a normal configuration?

Answer 5

The highest IP Address of the physical interfaces being used will be elected as Active. The lowest will be the standby.

Question 6

How do both routers make sure that the other one is still up?

Answer 6

They send Keep Alive Hellos

Question 7

How does a Standby Router become an Active Router

Answer 7

A keep alive hello wasn’t responded to so the Standby router will assume the role of Active

Question 8

What is a virtual IP address on a HSRP router?

Answer 8

It is the Virtual IP Address configured on both routers to act as a default gateway that never goes down

Question 9

Where does all traffic bound for the Virtual IP go?

Answer 9

Through the Active Router

Question 10

What is a genericconfiguration for an HSRP Router?

Answer 10

R1(config)#int {int}
R1(config-if)#ip address {ip-address} {subnet-mask}
R1(config-if)#no shut
R1(config-if)#standby 1 ip {ip-address}

Question 11

What is the default priority on routers for HSRP?

Answer 11

100

Question 12

When a higher priority router comes back online after a failure it will transition back to Active when what is enabled?

Answer 12

Pre-emption

Question 13

Is Pre-Emption enabled by default?

Answer 13

No

Question 14

The lower priority router will remain the active router when the failed router comes back online when this is not enabled on the router

Answer 14

Pre-emption

Question 15

How do you configure a priority and pre-emption on a router?

Answer 15

int {int}
R1(config-if)#standby 1 priority {priority}
R1(config-if)#standby 1 preempt

Question 16

How many versions of HSRP are there?

Answer 16

2

Question 17

How do you enable HSRP Version 2?

Answer 17

int {int}
R1(config-if)#standby version 2

Question 18

How do you verify HSRP?

Answer 18

show standby

Question 19

__________ enables you to install multiple routers in a subnet to collectively act as a single default router

Answer 19

FHRP (First-Hop Redundancy Protocol)

Question 20

FHRP routers share a virtual what?

Answer 20

IP address

Question 21

The capability of a network to dynamically recover from the failure of a device acting as a default gateway is known as what?

Answer 21

First-hop redundancy

Question 22

What 3 options are available for FHRPs?

Answer 22

HSRP (Hot Standby Router Protocol)
VRRP (Virtual Router Redundancy Protocol)
GLBP (Gateway Load Balancing Protocol)

Question 23

HSRP active router implements what two virtual items?

Answer 23

IP address
MAC address

Question 24

What must an HSRP virtual IP address be apart of to be a sound configuration?

Answer 24

The same subnet as the physical interface IP address

Question 25

If a router goes down and another takes over, what must the new active router do to get the switches on the subnet to change their MAC address tables to reflect the correct port to reach the virtual MAC?

Answer 25

Send a gratuitous ARP

Question 26

If you configured the priority of an HSRP router to have a priority of 90 over the default priority, would it be the active router?

Answer 26

No, because the priority would need to be higher than 100 to take on the preferred active role

Question 27

What would you command be to change the priority of an HSRP router considering the priority is in it’s default state of 100

Answer 27

standby 1 priority 110