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EIGRP Questions

July 27th, 2019 in ROUTE 300-101 Go to comments
EIGRP Quick Summary:
+ EIGRP supports up to six unequal-cost paths.
+ EIGRP provides a mechanism to load balance over unequal cost paths (or called unequal cost load balancing) through the “variance” command.
+ The feasibility condition states that, the Advertised Distance (AD) of a route must be lower than the feasible distance of the current successor route.
+ The path that meets the feasibility condition requirement is called a feasible successor

Question 1


By default, EIGRP load-shares over four equal-cost paths. EIGRP also support unequal-cost load balancing via the “variance” command.

Question 2


The table below lists the default administrative distance values of popular routing protocols:

Routing Protocols Default Administrative Distance
OSPF 110
RIP 120
eBGP 20
iBGP 200
Connected interface 0
Static route 1

Question 3


+ The time must be properly configured on all routers.
+ A working EIGRP configuration is recommended.

Reference: https://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/82110-eigrp-authentication.html

Question 4


The following list of parameters must match between EIGRP neighbors in order to successfully establish neighbor relationships:

+ Autonomous System number.
+ K-Values.
+ If authentication is used both: the key number, the password, and the date/time the password is valid must match.
+ The neighbors must be on common subnet (all IGPs follow this rule).

Question 5


When EIGRP is configured in a point-to-multipoint Frame Relay network, although the Hub can receive routing updates sent from its Spoke routers but split horizon rule forbids the Hub from relaying advertisements back out the interface on which they were received. For example in the topology below, Hub can receive routing updated from two Spokes but it cannot relay them out of S0/0 interface again (as it is the interface where it received the updates). To solve this problem we need to disable split horizon on S0/0 interface of Hub.


The command should be (suppose EIGRP 1 is running):

Hub(config)#interface serial0/0
Hub(config-if)#no ip split-horizon eigrp 1

Therefore answer A is correct.

In Non-broadcast networks (such as Frame-Relay), multicast (and broadcast) are not allowed while EIGRP (and OSPF, RIPv2) uses multicast to send Hello and Update messages. Therefore these dynamic routing protocols would not work well under Frame-Relay. To overcome this issue we usually add the keyword “broadcast” at the end of the frame-relay map statement (for example, “frame-relay map ip 403 broadcast“). This makes EIGRP to send update via unicast instead of multicast.

Another way to resolve above issue is to use the “neighbor” command. This command also make EIGRP to communicate with its neighbors via unicast -> B is correct.

Note: Although we can use the “neighbor” command to set up EIGRP neighbor relationship but the routes cannot be advertised from the Hub to the Spoke because of split horizon rule.

Question 6


Although we can use the “neighbor” command to set up EIGRP neighbor relationship but the routes cannot be advertised from the Hub to the Spoke because of split horizon rule -> Answer D is not correct.

To overcome the split horizon rule we can use subinterface as each subinterface is treated like a separate physical interface so routing updates can be advertised back from Hub to Spokes.  -> Answer C is correct.

Note: The split horizon rule states that routes will not be advertised back out an interface in which they were received on

Question 7


The “ip summary-address eigrp” command is used to configure interface-level address summarization. EIGRP summary routes are given an administrative distance value of 5. The administrative distance metric is used to advertise a summary without installing it in the routing table.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1.html

Question 8

Question 9


An example of how to configure EIGRP authentication on two routers that are connected to each other is shown below:

R1,R2(config)#key chain MYKEYS
R1,R2(config-keychain)#key 1
R1,R2(config-keychain-key)#key-string SecRetThing!

R1,R2(config)#interface serial 0/0
R1,R2(config-subif)#ip authentication mode eigrp 10 md5
R1,R2(config-subif)#ip authentication key-chain eigrp 10 MYKEYS

Question 10


When redistributing into RIP, EIGRP (and IGRP) we need to specify the metrics or the redistributed routes would never be learned. In this case we need to configure like this:

router eigrp 1
redistribute ospf 100 metric 10000 100 255 1 1500

Question 11

Comment pages
1 2 1394
  1. Anonymous
    February 2nd, 2017

    Where is question please?

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    February 28th, 2017

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  3. aboodnet
    March 16th, 2017

    why i cannot see any questions? only answers?

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    March 19th, 2017

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  5. Anonymous
    June 7th, 2017

    What is the correct answer for –
    Which two reasons fir IP SLA tracking failure are likely true?

    in some dumps I found A,C and others BE

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    July 12th, 2017


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  7. Anonymous
    July 12th, 2017

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  8. AnyMaster
    July 12th, 2017

    Which two options are requirements for EIGRP authentication? (Choose two)
    A. A crypto map must be configured.
    B. The Authentication key must be configured under the interface running EIGRP.
    C. The authentication key must be configured within the EIGRP routing configuration.
    D. The authentication key IDs must match between two neighbors.
    E. A separate key chain must be configured.
    F. AN IPsec profile must be configured.

    Ans: B,D.
    ‘B’ is not quite precise because de Auth Key is configured under the key chain.
    ‘D’ is tottaly true, the key ID is sent with the EIGRP packet and is used by the other side to identifies the key-string to use.
    ‘E’ is wrong because is not mandatory to configure an exclusive key chain for EIGRP, the same key-chain can be shared with RIPv2.

  9. CCNP Wanna Be
    July 26th, 2017

    Which command prevents routers from sending routing updates through a router interface?
    A. default-metric 0
    B. distribute-list in
    C. passive-interface
    D. distribute-list out

    Answer is suppose to be C passive-interface, but distribute-list in could also used? Thoughts?

  10. wint3r
    July 28th, 2017

    distribute-list out command is configured inside ospf configuration and it prevents routes from going out of OSPF routing protocol and is not specific to an interface.

    but a nice question though

  11. Ian
    August 21st, 2017

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    August 28th, 2017

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    August 30th, 2017

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  14. Anonymous
    September 1st, 2017

    Question 3 must be: Time instead of password I think:

    The time must be properly configured on all routers. Refer to Configuring NTP for more information. For the authentication keychains with keys are used. The term password is not mentioned in the cisco documentation.

  15. Akreman21
    September 12th, 2017

    Question 3 must be: Time instead of password

    I think the same….In other documents the answer is TIME.

  16. Anonymous
    September 17th, 2017

    thanks Cool guy

  17. rafibd71
    September 26th, 2017

    why I cant see any questions…

  18. learner
    October 13th, 2017

    Q3: D. Time


    The time must be properly configured on all routers. Refer to Configuring NTP for more information.

    A working EIGRP configuration is recommended


  19. H-tech
    October 14th, 2017

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  20. 1Way
    October 22nd, 2017

    Q5. Asks about adjacencies, not routing updates. Split-Horizon has nothing to do with forming a adjacencies.

  21. 1Way
    October 22nd, 2017

    Q6. I be interested to hear others opinion in this. As far as I can see ‘A’ is correct but ‘C’ is only correct if you concede that you are your are changing a multi-point topology into a partial mesh point to point topology.

  22. Paco
    October 31st, 2017

    Q4. Answer is “time” instead of “password”

  23. Night King
    November 8th, 2017

    “Q5. Asks about adjacencies, not routing updates. Split-Horizon has nothing to do with forming a adjacencies.” – 1Way

    Agreed. Something is wrong with this question or answer choices. ‘A’ is not a valid answer for bringing up the adjacency. In addition to neighbor command, couldn’t you have a frame-relay map with the “broadcast” keyword to facilitate the hello packets?

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    November 9th, 2017

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    November 9th, 2017

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    November 11th, 2017

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  27. Leland
    November 14th, 2017

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    November 21st, 2017

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    December 13th, 2017

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  30. buttmunch
    December 19th, 2017

    Agree, Q3 is “time”

    They’re talking about rollover and besides, passwords don’t have to be the same on all routers.

  31. Tutter
    December 24th, 2017

    can you please delete all the idiots that are posting their email addresses??
    They are scammers trying to sell other people’s info and collecting email addresses
    for spamming.

    Just put filters in the posting field that prevents gmail, yahoo and .com

  32. Anonymous
    January 12th, 2018


    what’s the correct answer in Q3, time or password?

  33. Rizwan
    February 12th, 2018

    can anyone explain q2?

  34. Rizwan
    March 9th, 2018

    HEY DIGITALTUT. please tell us what answer we have to select in exam TIME or PASSWORDS

    Question 3

    Other than a working EIGRP configuration, which option must be the same on all routers for EIGRP authentication key rollover to work correctly?
    A. SMTP
    B. SNMP
    C. Passwords
    D. Time

    Answer: D

  35. Pgun
    March 9th, 2018

    Here the questions: http://www.mediafire.com/file/sha2qvcgaicsc2r/ROUTE_Jan_2018.pdf
    Plead read ROUTE FAQs & Tips, or any others FAQs.

  36. iec1201929
    March 9th, 2018

    Hey DIGITALTUT, i have the same Question that Rizwan, Could you please help us?


  37. BoseL0rd
    March 10th, 2018

    It is TIME. Option D.

    The time must be properly configured on all routers. Refer to Configuring NTP for more information.
    A working EIGRP configuration is recommended.


  38. Marcus
    March 16th, 2018

    What about Q9, why D (The authentication key IDs must match between two neighbors.) is correct?

    The Official Cert Guide says:
    “A key string specifies a preshared key to be used between routers. Therefore, the
    key string must match on two routers for them to mutually authenticate. The key
    chain name and key number values are locally significant and do not have to match
    on a neighboring router.”

    Can anyone clear this up?

  39. Anonymous
    March 24th, 2018

    Please i need questions
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  40. Marcus
    April 8th, 2018

    In addition to Q9. There is an errata in OFG, see the discussion https://learningnetwork.cisco.com/thread/61271
    So, key number MUST match and D is correct answer.

  41. Anon
    April 23rd, 2018

    Can someone please explain Q4?

  42. IQ
    April 23rd, 2018

    Hello Pgun,

    Thanks for sharing your PDF with everyone. I appreciate your assistance. Most people come on here and provide a link to purchase. This is a community for sharing not to try to sell. Thanks again and God Bless.

  43. Question 8
    August 18th, 2018

    sha+md5 (a and b)

  44. Dmitry
    September 25th, 2018

    About Q6: why variants A and C are correct, I think correct are A and D. Q6 is the similar as Q5, and in Q5 we use variant with statically neighbor command, but in Q6 we don’t use it, why?

  45. Q4 answer C
    October 4th, 2018

    “The router needs to know the time to be able to rotate through keys in synchronization with the other participating routers, so that all routers are using the same key at the same moment. Refer to the Network Time Protocol (NTP) and calendar commands in the “Performing Basic System Management” chapter of the Cisco IOS Configuration Fundamentals Configuration Guide for information about configuring time on your router.”


  46. manhattan
    October 24th, 2018

    @Dmitri, yes the same think i’ve immediately thought after read them, very strange, someone can clarify about question 5-6?
    Q6 is AC or AD?

  47. Dany1
    November 16th, 2018

    Question 6
    In a point-to-multipoint Frame Relay topology, which two methods ensure that all routing updates are received by all EIGRP routers within the Frame Relay network? (Choose two)
    So, in that question adjacency is already establish and the issue is to exchange the EIGRP routers:
    1. for point-to-multipoint ( int serial5/0; ip address the only way is to run or and affect both RIP and EIGRP (if RIP is also running there)
    2. for point-to-multipoint interface with sub-interface (Router(config)#int s5/1.1 point-to-point; ip address; int s5/1.2 point-to-point …) multipoint link became several point-to-point links, so is no need for command.
    Summary: Answers A & C
    Point D is reffering only to how can create relationship with EIGRP neighbors

  48. Dany1
    November 16th, 2018

    point 1 was not saved correctly:
    for affect only EIGRP
    command affect both RIP & EIGRP
    in Frame Relay point-to-multipoint network is not possible to encountered “root loops”, because of the topology, so this command(no ip split-horizon) is safe to run.

  49. Dany1
    November 16th, 2018

    Point 1
    no ip split-horizon eigrp AS Num
    no ip split-horizon
    Probably because i use

  50. Anonymous
    November 27th, 2018

    Please give me the question. Thank you.

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