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OSPF Questions

May 9th, 2017 Go to comments

Note: If you are not sure about OSPF, please read our OSPF Tutorial.

Question 1

Question 2

Question 3

Question 4

Explanation

In order to become OSPF neighbor following values must be match on both routers:

+ Area ID
+ Authentication
+ Hello and Dead Intervals
+ Stub Flag
+ MTU Size

Therefore we need to adjust the MTU size on one of the router so that they are the same. Or we can tell OSPF to ignore the MTU size check with the command “ip ospf mtu-ignore”.

Question 5

Explanation

D is correct because these entries must match on neighboring routers:

Hello and dead intervals
Area ID (Area 0 in this case)
– Authentication password
– Stub area flag

In this case Ethernet0 of R1 has Hello and Dead Intervals of 5 and 20 while R2 has Hello and Dead Intervals of 10 and 40 -> R1 and R2 cannot form OSPF neighbor relationship.

Question 6

Explanation

The information available to a distance vector router has been compared to the information available from a road sign. Link state routing protocols are like a road map. A link state router cannot be fooled as easily into making bad routing decisions, because it has a complete picture of the network. The reason is that unlike the routing-by-rumor approach of distance vector, link state routers have firsthand information from all their peer routers. Each router originates information about itself, its directly connected links, and the state of those links (hence the name). This information is passed around from router to router, each router making a copy of it, but never changing it. The ultimate objective is that every router has identical information about the internetwork, and each router will independently calculate its own best paths.

Reference: http://www.ciscopress.com/articles/article.asp?p=24090&seqNum=4

Question 7

Explanation

192.168.101.45 belongs to 192.168.0.0/16 network so the router will use FastEthernet1/1 as the exit interface.

Question 8

Explanation

A is not correct because the backbone area of OSPF is always Area 0.
B is not correct because R1 or R3 must be the DR or BDR -> it has to establish neighbor adjacency with the other.
C is not correct because OSPF neighbor relationship is not established based on static routing. It uses multicast address 224.0.0.5 to establish OSPF neighbor relationship.
E is not correct because configure EIGRP on these routers (with a lower administrative distance) will force these routers to run EIGRP, not OSPF.

D and F are correct because these entries must match on neighboring routers:

Hello and dead intervals
Area ID (Area 0 in this case)
– Authentication password
– Stub area flag

Question 9

Explanation

The most obvious thing in this configuration is R1 forgot to run OSPF on interface Fa0/0 (with the “network 192.168.12.0 0.0.0.255 area …”) command so the computers behind 192.168.10.0/24 network does not know how to reach resources on a remote network.

Question 10

Explanation

The well-known formula to calculate OSPF cost is

Cost = 108 / Bandwidth

so B is the correct answer.

Question 11

Explanation

In IPv6, you can configure many address prefixes on an interface. In OSPFv3, all address prefixes on an interface are included by default. You cannot select some address prefixes to be imported into OSPFv3; either all address prefixes on an interface are imported, or no address prefixes on an interface are imported.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/ip6-route-ospfv3.html

Question 13

Question 14

Explanation

Because the destination of 172.16.1.1 is not present in the routing table so this router would use the default route (O*E2) to forward this packet. Usually the O*E2 is the result of the “default-information originate” command on the upstream router.

Comments (18) Comments
  1. supunit21
    February 6th, 2017

    where are questions?

  2. Lucky
    February 8th, 2017

    Questions are Missing, Admin ?

  3. kk
    February 26th, 2017

    where are the questions ??

  4. Mr. Fisher
    March 10th, 2017

    There is no questions, where is it?!

  5. skyflakes
    March 12th, 2017

    find in other links, there is a pdf file in this 1. maybe in the share your ccna experience page.

  6. banay
    March 14th, 2017

    @supunit21 @Lucky @kk
    here you the link for the Questions

    http://www.9tut.com/ccna-questions-and-answers

  7. Anonymous
    March 16th, 2017

    Passed CCNA 200-125
    Studied Latest dumps 171+182+191 Questions files + Labs from below link
    https://docs.google.com/uc?export=download&id=0BwepsouMuqCjUnBBcFpWaVFFcEU

  8. waqas
    April 18th, 2017

    Plz some1 forward me 171 & 191 qs dums at waqas.uetpeshawar at gmail dot com. thanks in advance

  9. waqas
    May 5th, 2017

    passed ccna exam today (886/1000), nothing was really difficult.
    two labs there
    1). ACL
    2). EIGRP (little changes in topo)
    i read a lot of dump’s (545/719/182/266/473) but i would suggest prepare 719 and just go through 266, most of the questions there.
    GOOD LUCK!!!!

  10. Whoa!!!
    May 6th, 2017

    Q4 why answer is E and not D since as the explanation said, MTU and cost must match to established adjacencies. And AFAIK the default MTU is 1500. Need comment please

  11. Whoa!!!
    May 6th, 2017

    I mean why E instead of C?

  12. Anonymous
    May 29th, 2017

    Does anyone have the dump or questions for 266 and 719

  13. froggen
    June 8th, 2017

    @ woah. OSPF doesn’t need matching costed links to establish a neighbor relationship.

  14. duck
    June 8th, 2017

    Isnt the answer to question 13 supposed to be enable IPv4 to the F0/0 interface? I have seen that answer as being correct on other dumps. In the output it states ‘Ipv6 enable’. Any thoughts, @9tut ?

  15. Richard
    June 28th, 2017

    Passed today, can confirm this dumps as valid till now http://www.9tut.com/basic-questions/comment-page-2#comment-3442171

  16. SsS
    July 12th, 2017

    what is the correct answer of Q3 please

  17. Anonymous
    July 16th, 2017

    @9tut – Could you please conmfirm the Question 13? Someone mentioned that the answer should be the –
    A. Configure a loopback interface on R1..

  18. Anonymous
    July 16th, 2017

    Sorry the Q-13 should be the – C. Configure an IPv4 address on interface Fa0/0. Is it correct?