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HSRP Questions

May 4th, 2017 Go to comments

Note: If you are not sure about HSRP, please read our HSRP tutorial.

Question 1

Explanation

First Hop Redundancy Protocol (FHRP) is a protocol that enables two or more devices to work together in a group, sharing a single IP address, the virtual IP address. One router is elected to handle all requests sent to the virtual IP address. With HSRP, this is the active router. An HSRP group has one active router and at least one standby router.

Question 2

Question 3

Explanation

Virtual Router Redundancy Protocol (VRRP) is one of the First Hop Redundancy Protocols that is supported by Cisco. Unlike HSRP and GLBP (which are Cisco proprietary protocols), VRRP is an industry standard protocol.

Question 4

Question 5

Explanation

HSRP consists of 6 states:

State Description
Initial This is the beginning state. It indicates HSRP is not running. It happens when the configuration changes or the interface is first turned on
Learn The router has not determined the virtual IP address and has not yet seen an authenticated hello message from the active router. In this state, the router still waits to hear from the active router.
Listen The router knows both IP and MAC address of the virtual router but it is not the active or standby router. For example, if there are 3 routers in HSRP group, the router which is not in active or standby state will remain in listen state.
Speak The router sends periodic HSRP hellos and participates in the election of the active or standby router.
Standby In this state, the router monitors hellos from the active router and it will take the active state when the current active router fails (no packets heard from active router)
Active The router forwards packets that are sent to the HSRP group. The router also sends periodic hello messages

Please notice that not all routers in a HSRP group go through all states above. In a HSRP group, only one router reaches active state and one router reaches standby state. Other routers will stop at listen state.

Question 6

Explanation

There are three First Hop Redundancy Protocols which are HSRP, VRRP and GLBP. HSRP and GLBP are Cisco proprietary protocols while VRRP is a standards-based protocol.

Question 7

Explanation

HSRP election is based on a priority value (0 to 255) that is configured on each router in the group. By default, the priority is 100. The router with the highest priority value (255 is highest) becomes the active router for the group. If all router priorities are equal or set to the default value, the router with the highest IP address on the HSRP interface becomes the active router. Below is an example of assigning HSRP priority of 200 to R1:

R1(config-if)# standby 1 priority 200

Question 8

Explanation

The “preempt” command enables the HSRP router with the highest priority to immediately become the active router. For example if we have a new router joining an HSRP of 1 and we want this router becomes the active router immediately (provided it had the highest HSRP priority) then we will need this additional command:

New_Router(config-if)#standby 1 preempt

Question 9

Explanation

Both HSRP version 1 & version 2 support preempt command -> Answer D is not correct.

In HSRP version 1, group numbers are restricted to the range from 0 to 255. HSRP version 2 expands the group number range from 0 to 4095 -> A is correct.

Question 10

Explanation

When all other routers in the group fail, the local router will not receive any HSRP Hello messages so it will become “active”. Notice that in this case the “preempt” command is not necessary. The “preempt” command is only useful when the local router receives a HSRP Hello message from the active HSRP router with a lower priority (then the local router will decide to take over the active role).

Question 11

Explanation

The virtual MAC address of HSRP version 1 is 0000.0C07.ACxx, where xx is the HSRP group number in hexadecimal based on the respective interface. For example, HSRP group 10 uses the HSRP virtual MAC address of 0000.0C07.AC0A. HSRP version 2 uses a virtual MAC address of 0000.0C9F.FXXX (XXX: HSRP group in hexadecimal)

For more information about HSRP operation, please read our HSRP tutorial.

Question 12

Explanation

With HSRP, two or more devices support a virtual router with a fictitious MAC address and unique IP address. There are two version of HSRP.

+ With HSRP version 1, the virtual router’s MAC address is 0000.0c07.ACxx , in which xx is the HSRP group. Therefore C is correct.
+ With HSRP version 2, the virtual MAC address is 0000.0C9F.Fxxx, in which xxx is the HSRP group.

Note: Another case is HSRP for IPv6, in which the MAC address range from 0005.73A0.0000 through 0005.73A0.0FFF.

(Good resource for HSRP: http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/unicast/configuration/guide/l3_hsrp.html)

Comments (16) Comments
  1. V
    March 15th, 2017

    what are 2 requirements of HSRP group?
    exactly one active router
    one or more standby router
    OR
    exactly one standby active router

    which is correct can someone please help?

  2. SJK
    March 18th, 2017

    The Correct answer is A and B as the standby must be of the secondary router

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    March 22nd, 2017

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  4. Student
    March 28th, 2017

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  5. KACS
    April 27th, 2017

    What are 2 requirements of HSRP group?
    Answers: 1-Exactly one active router. 2-One or more standby router.

  6. Muhammad Mohyuddin
    May 16th, 2017

    what are 2 requirements of HSRP group?

    A exactly one active router
    B exactly one standby active router

  7. ider
    May 21st, 2017

    Which configuration command can you apply to a router so that its local interface becomes active if all other
    routers in the group fail?
    A. Router(config)#standby 1 preempt
    B. No additional configuration is required
    C. Router(config)#standby 1 Priority 250
    D. Router(config)#standby 1 track Ethernet

  8. anonymous
    June 11th, 2017

    @ider i thnk the answer should be B. as others have failed, the router will automatically take over without additional config

  9. anonymous
    June 11th, 2017

    @ider B. as others have failed, the router will automatically take over without additional config

  10. Floyd
    June 28th, 2017
  11. Ihsan
    August 10th, 2017

    where are the question whose answers are discussed above.

  12. nickaro
    August 15th, 2017

    In Q.2 we have two correct answers, A and C. Anyone can show me the differences between them?

    If this is a CCNA real question, only one answer can be checked…

    Thank you in advance.

  13. Pls… Stop it and start helping
    September 10th, 2017

    For everyone who wants a valid full CCNA 200-125 –>DONT CLICK<— this link because it is just a bait… Its not the full version.. they want you to buy it!

    Fake link ( just a damn demo ): https://drive.google.com/open?id=0B5mAFqgydmCzc3BmR214LWFuTDg

  14. anon
    September 10th, 2017

    question 8.
    Can someone please fix the grammer on the question. It makes no sense.

  15. ali
    October 22nd, 2017

    9tut please
    what is the correct answer pleaaaaaaaaaaaaaaaaaaase
    Which value is used to determine the active router in an HSRP default configuration?

    A.Router loopback address
    B.Router IP address
    C.Router priority
    D.Router tracking number

  16. Avi
    November 5th, 2017

    @ali ans is c

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