OSPF Questions
Here you will find answers to OSPF Questions
Note: If you are not sure about OSPF, please read my OSPF tutorial
Question 1
After the network has converged, what type of messaging, if any, occurs between R3 and R4?
A. No messages are exchanged.
B. Hellos are sent every 10 seconds.
C. The full database from each router is sent every 30 seconds.
D. The routing table from each router is sent every 60 seconds.
Answer: B
Explanation
HELLO messages are used to maintain adjacent neighbors so even when the network is converged, hellos are still exchanged. On broadcast and point-to-point links, the default is 10 seconds, on NBMA the default is 30 seconds.
Although OSPF is a link-state protocol but the full database from each router is sent every 30 minutes (not seconds) -> C and D are not correct.
Question 2
R1 is configured with the default configuration of OSPF.
From the following list of IP addresses configured on R1, which address will the OSPF process select as the router ID?
A. 192.168.0.1
B. 172.16.1.1
C. 172.16.2.1
D. 172.16.2.225
Answer: A
Explanation
The Router ID (RID) is an IP address used to identify the router and is chosen using the following sequence:
+ The highest IP address assigned to a loopback (logical) interface.
+ If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.
+ The router ID can be manually assigned
In this case, because a loopback interface is not configured so the highest active IP address 192.168.0.1 is chosen as the router ID.
Question 3
What information does a router running a link-state protocol use to build and maintain its topological database? (Choose two)
A. hello packets
B. SAP messages sent by other routers
C. LSAs from other routers
D. beacons received on point-to-point links
E. routing tables received from other link-state routers
F. TTL packets from designated routers
Answer: A C
Question 4
R1 is unable to establish an OSPF neighbor relationship with R3. What are possible reasons for this problem? (Choose two)
A. All of the routers need to be configured for backbone Area 1.
B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3.
C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.
D. The hello and dead interval timers are not set to the same values on R1 and R3.
E. EIGRP is also configured on these routers with a lower administrative distance.
F. R1 and R3 are configured in different areas.
Answer: D F
Explanation
To become OSPF neighbors, routers must meet these requirements: Hello interval, Dead interval and AREA number -> D and F are correct.
Question 5
ROUTER# show ip route
192.168.12.0/24 is variably subnetted, 9 subnets, 3 masks
C 192.168.12.64 /28 is directly connected, Loopback1
C 192.168.12.32 /28 is directly connected, Ethernet0
C 192.168.12.48 /28 is directly connected, Loopback0
O 192.168.12.236 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0
C 192.168.12.232 /30 is directly connected, Serial0
O 192.168.12.245 /30 [110/782] via 192.168.12.233, 00:35:36, Serial0
O 192.168.12.240 /30 [110/128] via 192.168.12.233, 00:35:36, Serial0
O 192.168.12.253 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0
O 192.168.12.249 /30 [110/782] via 192.168.12.233, 00:35:37, Serial0
O 192.168.12.240/30 [110/128] via 192.168.12.233, 00:35:36, Serial 0
To what does the 128 refer to in the router output above?
A. OSPF cost
B. OSPF priority
C. OSPF hop count
D. OSPF ID number
E. OSPF administrative distance
Answer: A
Explanation
The first parameter is the Administrative Distance of OSPF (110) while the second parameter is the cost of OSPF.
Question 6
Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two)
A. It is locally significant.
B. It is globally significant.
C. It is needed to identify a unique instance of an OSPF database.
D. It is an optional parameter required only if multiple OSPF processes are running on the router.
E. All routers in the same OSPF area must have the same process ID if they are to exchange routing information.
Answer: A C
Question 7
Open Shortest Path First (OSPF) is a routing protocol developed for Internet Protocol (IP) networks by the Interior Gateway Protocol (IGP) working group of the Internet Engineering Task Force (IETF). What is the default administrative distance of the OSPF routing protocol?
A. 90
B. 100
C. 110
D. 20
E. 130
F. 170
Answer: C
Question 8
The internetwork infrastructure of company XYZ consists of a single OSPF area as shown in the graphic.
There is concern that a lack of router resources is impeding internetwork performance.
As part of examining the router resources the OSPF DRs need to be known.
All the router OSPF priorities are at the default and the router IDs are shown with each router.
Which routers are likely to have been elected as DR? (Choose two)
A. Corp-1
B. Corp-2
C. Corp-3
D. Corp4
E. Branch-1
F. Branch-2
Answer: D F
Explanation
There are 2 segments on the topology above which are separated by Corp-3 router. Each segment will have a DR so we have 2 DRs.
To select which router will become DR they will compare their router-IDs. The router with highest (best) router-ID will become DR. The router-ID is chosen in the order below:
+ The highest IP address assigned to a loopback (logical) interface.
+ If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.
In this question, the IP addresses of loopback interfaces are not mentioned so we will consider IP addresses of all active router’s physical interfaces. Router Corp-4 (10.1.40.40) & Branch-2 (10.2.20.20) have highest “active” IP addresses so they will become DRs.
Question 9
Which address are OSPF hello packets addressed to on point-to-point networks?
A. 224.0.0.5
B. 172.16.0.1
C. 192.168.0.5
D. 223.0.0.1
E. 254.255.255.255
Answer: A
Question 10
Which statements describe the routing protocol OSPF? (Choose three)
A. It supports VLSM.
B. It is used to route between autonomous systems.
C. It confines network instability to one area of the network.
D. It increases routing overhead on the network.
E. It allows extensive control of routing updates.
F. It is simpler to configure than RIP v2.
Answer: A C E
Question 11
R1 is unable to establish an OSPF neighbor relationship with R3
What are possible reasons for this problem? (Choose two)
A. All of the routers need to be configured for backbone Area 1
B. R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3
C. A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established.
D. The hello and dead interval timers are not set to the same values on R1 and R3
E. EIGRP is also configured on these routers with a lower administrative distance
F. R1 and R3 are configured in different areas
Answer: D F
Question 12
RouterD# show ip interface brief
Given the output for this command, if the router ID has not been manually set, what router ID will OSPF use for this router?
A. 10.1.1.2
B. 10.154.154.1
C. 172.16.5.1
D. 192.168.5.3
Answer: C
Question 12 is Incorrect, correct answer should be D
Question 12 is correct, the answere is indeed C. OSPF uses the highest IP address of the loopback interfaces first. If ther are no loopback interfaces then OSPF will use the highest IP address of the active interfaces.
The answer is C loppback0
Could someone explain the answer given for the question 8. In my understanding the DR will be the router with the highest IP as the other settings are defaults( priority , no router id set and no loopback) . In the topology routers Branch 2(10.2.20.20) and Branch 1 (10.2.10.10)are the ones having higest IP .
Comments please !
There is a wan link dividing the network, so I think we are meant to assume they are different networks 10.1.0.0 and 10.2.0.0
Branch 2 (10.2.20.20) has the highest IP on its network, so it becomes a DR for the 10.2.0.0 network.
Corp4 (10.1.40.40) has the highest IP on its network, so it becomes the DR for the 10.1.0.0 network.
I could be wrong, but I believe that is how it works. Hope that helps.
Could anyone plz explain question 9?
as i know that the chosen address is for multicast to point to point so plzzz verify
http://en.wikipedia.org/wiki/Multicast_address
A is the right answer.
Thank you :))
On Q4 should it not be backbone area 0? I also thought I had seen that question elsewhere and it showed a topology diagram of r1-r2-r3
Thanks.
By the way in my comment above I was not implying that A should be th correct answer, and after thinking about it some more I guess it doesn’t really matter what it says on a wrong answer.
As mentioned above by Frerot about Q#8,
@tut or someone can plz explain the answer bcoz this Q was in the 640-816 exam.
thanks.
@sam: I added explanation to Q#8, kindly check.
@tut Thanks for that quick response.
but you know what, the Q says 2 DRs and same network cannot have 2 DRs at a time atleast that should have come to my mind in the test 😛
I would still appreciate if you can explain a little more about what you mean by segment and how it is defined in this scenario.
@sam: segment here means a “broadcast domain”. In this question there are 2 segments:
+ Segment 1: limited by Corp1,Corp2,Corp3,Corp4
+ Segment 2: limited by Corp3, Branch1, Branch2
Each segment requires a DR so we can have 2 DRs in this question.
Q9) if the question specifically says point to point which means there are only two host(sender and receiver)involved why should it use a muticast ip …?
Why not a unicast..?
Q2 and Q8 This question was there for my exam… on 28th July…
Questions 1,2, 6 and 10 were on test today (8/5/11). Passed with 920 🙂
could anyone explain Q6. for me. I dnt understand why E is not correct
@dferra
the name says it all: *process identifier*
the process is local, it doesn’t affect any other devices except the router it is running on.
i believe you mixed up the EIGRP A.S. number and the OSPF process ID…
EIGRP A.S. number – global importance, must be the same on all routers in the autonomous system
OSPF process ID – can be any number from 0 to 65535 (don’t quote me on the numbers). it has importance only on the router.
Test test today ICND 2… Q1 , Q2, Q4, Q8, Q11, Q12 were on the test
Re: Q1 on exam…they also ask how many routes are placed by OSPF on the R1 routing table. I believe the highest is 7 routes, but also offers 1 route,2 routes,5 routes.
Anyone know/remember the answer to that one?
Grr, also saw that on on the ICND2 testr a couple of weeks ago. I was not ready for that test.
How many routes are placed on the R1 routing table in
question 1. I also answered 7, but believe It is wrong, just cannot wrap my head around that one. And I know it is easy.
Grr, and anyone else. Question #1 was asked as this,
OSPF is configured using default classful addressing.
With all routers and interfaces operational, how many networks will be in the routing table of router 1, that are indicated to be learned by OSPF.
answers are
2,3, 4, 5, 6,7
Correct Answer is 4 (Thanks to VCE from Xallax)
Reason “Learned by OSPF” If you look at the router 1 how many routes does it need to learn? It already knows about its directly connected ones, only those not directly connected are “Learned by OSPF”
I’ve been trying to figure this out all week.
@CrazyDude, you gotta change your nick dude. You’re starting to make sense… 😀
Can I suggest SensibleDude? 😉
@crazydude
I got this question. I think I got this wrong though. I think I answered 4 because it is classful addressing (I think three class C addresses were used for OSPF and a public one for the ISP). Using it here, I would say router 1 knows about the 172.16.0.0 network and 192.168.0.0 network so I would chose 2. The question asks how many networks are in the routing table of router 1 so it should include those directly connected. Again, not sure with this one.
Just read that OSPF does not support auto-summarization so it should learn 4 (not including those directly connected). I just read my comment and it is wrong! I really hate this question.
took my icnd1 and 2 today.
questions 1, 2, 7 and 8 were there on todays exam.
passed both.
thank you all
The answer to Q1 is wrong. It should be: A…no messages are exchanged. I just labbed it up in GNS3 and ran a debug ip ospf hello…the only messages exchanged are between full neighbors.
Disregard my last post…Q1 is right as the two routers have their FastEthernet ports connected to a switch on the same network which allows them to become neighbors. Great site! Taking my ICND2 tomorrow morning.
Can some pliz convince me on Question 3.
@nkuba
“Hello protocol – The OSPF Hello protocol provides dynamic neighbor discovery and maintains neighbor relationships. Hello packets and Link State Advertisements(LSAs) build and maintain the topological database.
Link State advertisement – A Link State Advertisement(LSA) is an link-state protocol data packet containing link-state and routing information that’s shared among OSPF routers. There are different types of LSA packets, and I’ll go into these shortly. An link-state protocol router will exchange LSA packets only with routers to which it has established adjacencies.”
I got the question 2 today on the exam today. within the same diagram on question 2, there was questions as Crazydude mentioned.
OSPF is configured using default classful addressing.
With all routers and interfaces operational, how many networks will be in the routing table of router 1, that are indicated to be learned by OSPF.
answers are
2,3, 4, 5, 6,7
I picked 4 but not sure.
also the same diagram question which command will you use to load balance R3 and R4. I picked ip ospf priority but i am not positive. anybody have answers?
int fa0/0
ip ospf cost
the costs must be the same for load balancing to happen
I had diagram from 1,2 question. 4 questions.
Question about load balansing from R2 to sw-a network + how match routes R1 will lern from R2 on OSPF.
Q1,Q2 on my exam today
Hi 9TUT,
I didnot understand the question 11?Can anybody explain to me??
Passed ICND2 today with 944!! I had questions #1 and #2 on my test today
Congratulations WKC. I sit Wednesday. Was the exam like these tests?
Where there areas not stated here. What labs did you get?
Cheers
Cryptkeeper, I’m currently writing up my whole experience with details, it will be kind of long so stay tuned, will have it up soon.
Took ICND2 today and passed with 944! Every single question I had came from either 9tuts CCNA pool of questions or their ICND2 pool of questions on their site, although the majority of my questions came from the CCNA portion so make sure you study both sites. Also, know your theory because if you just memorize dumps and can’t apply it on the job then you won’t keep a job very long. I only had one SIM to do which was the VTP sim. I had the Frame Relay Simlet and a couple of Drag and Drops. The rest were just questions from these sites. It was not near as hard as I was expecting after studying for the last 6 months. I think I over prepared but it paid off for me. I finished the test and still had about 25 minutes to spare. These are the questions I had and what sections they came from on 9tut.
CCNA-Cisco IOS Questions #1 #3 #5 — CCNA-Cisco IOS Questions 2 #2 #10
CCNA- Show Command Questions #7 –CCNA- WAN #1 –CCNA-IP Routing Questions 2 #10
CCNA-RIP Questions #13 –CCNA-OSPF Questions #4 #6 –CCNA-OSPF Questions 2 #2 #6
CCNA-EIGRP Questions #1 #2 –CCNA-Security Questions #2 #5 #10
CCNA-NAT and PAT Questions #4 –CCNA-Drag and Drop 1 #1 #4
CCNA-Drag and Drop 4 #2 –CCNA-Switch Questions #10 #12 #13
CCNA-Hotspot Frame Relay Simlet –CCNA-STP Questions #1 –CCNA-STP Questions 2 #5
CCNA-IPV6 Questions #7 –CCNA-Subnetting #3 –CCNA-Subnetting Questions 4 #1
CCNA-Operations 1 #5 #12 –CCNA-Troubleshooting 1 #6
ICND2 Labsim VTP Configuration –ICND2-VTP&VLAN Questions #5
ICND2-EIGRP Questions #6 –ICND2-EIGRP 2 #6 #7 –ICND2-OSPF #1 #2
INCD2-OSPF Questions 2 #2 #3 #5 #9 #12
Study Material:
8 Years of on the job experience
5 Week CCNA course at local Vocational School
Wendell Odem Books
Chris Bryant http://www.thebryantadvantage.com/ and also his Youtube channel
VCE’s
9tut
WKC. thats awsome, thanks fella (fellerette)
Are there any Route Summarization questions on the exam? I noticed this wasn’t touched upon on the site. Thanks
I had questions 1,2,7 and 8 today. Passed
could somone explain q 11? I get the timer mismatch, but the diagram is labled that all the routers are in the same area isn’t it?
I had a simlet based around around question 1 topology today but out of the 4 multi choice q’s within it 3 were different from above. Also had the frame relay sim and the vtp sim. A lot of q’s were based around ipv6 but the stuff here is still valid. Practice and practice and practice again the different sims. oh I passed 🙂
Hi guys. I desperately need your help. I have to do the following and I have absolutely no idea how to do it.. Please help me out. my e-mail is antonisbigman@yahoo.gr
Outline:
ABC is currently re-locating to a new office in the city centre of London. The IT Manager has convinced the management of the company for enough budget for a new state-of-the-art IT implementation/solution.
The new premises consist of a building with 4 floors that all 80 employees of the company will be based there. Each floor has its own ITF room and the main computer room is located in the first floor. All servers and core devices will be placed there.
Your first task is to propose the design of the network infrastructure, take into consideration that the company is willing advanced technologies to be implemented. Your proposal should cover all the necessary architectures that should be followed for a modern, expandable, easy to manage network infrastructure, including cutting-edge technologies, helpful for any organization in our days. Then your design should include the addressing scheme of the company, taking into consideration the different types of traffic that you have proposed. Finally all technologies and devices should be implemented on a virtual tool.
Your work will be presented to the senior management of the company.
Tasks:
A. Design the logical diagram of the company’s network infrastructure (visio).
B. Propose all necessary Subnets and Protocols to use (table)
C. Implement the configuration of all the protocols and the technologies that you have identified (VLANs, Interfaces, etc) on a simulator (packet tracer).
D. Analyze the network infrastructure and the benefits of your proposal.
With the help of this website and http://www.freeccnaworkbook.com i passed with a 931/1000
questions 1, 2, 12 were on my exam today…i also passed the exam. Many thanks, guys/gals.
I have passes the exam with 944 marks questions #1 and 2 came into my exam.
Q# 1, 2, 8 and 12 on my exam.
Passed with 944 mark. Q8 and Q12 were on my exam, exactly as here.
Also I want to personally thank WKC for his post from January 29th. I’ve used your list of questions for my studies and they had helped me tremendously. Because of your list, I’ve nailed down many of the questions on the exam. Thank you!!!
Passed ICND2 today with 986/1000 🙂
Q8 was there
AND
Q1 + Q2 where included in one sim Question that include 4 Qs about same topology
Q1, Q2 & Q3 cam out
Ignored previous, look alike Q1, Q2 & Q8 came out
@ST when you say Q1,Q2 & Q8 came out do you mean they were dropped from the test?
or you saw them on the test?
Thx!
Passed ICND2 with 832/1000. passing marks was 825.
It had 1 sim and lots of choose 2 choose 3 choose 4 questions.
question 1 topology but different question was in the test
anyone can help me for my icnd 2 i’am prepare my exam which dump is valid
@Joe Sorry I answer late as I’m new to the site and am going to take ICND2 this Friday. To answer your question about Q11, yes if R1 and R3 config OSPF to have different area than 0. But you’re right that the diagram is downright misleading. Just always trust show running-config command 🙂
Q1,2 and 12 today
Does anyone have any information on the new OSPF sim that some test takers have been getting recently?
nailed icnd2 today. Q1 (plus addtl question about balancing and how many networks will be in the routing table of router 1), Q2, Q7, Q8.
got Q1-4 from this doc today http://dc386.4shared.com/doc/yPoKQf8r/preview.html
@almost heart attack Thank you for posting the link.
2nd try today and passed with 972. Same Q 1,2 and 12
Just like Usian Bolt warms up his pistons before his 100m drag… ;-D I am revising it for ICND2, appearing on 27th of August
CCNA Certified today!
944/1000 in ICND2.
Dumps valid. Study your concepts.
Got VTP lab, frame-relay sim, and OSPF Hotspot.
Drag and Drop: Holddown timer, Poison reverse, Split-horizon.
Majority of multiple choice questions on STP, RSTP (Port roles), VPN, Switchport security and couple of IP addressing.
Total 43 Questions, 825 passing, 125mins to solve.
Study well, understand concepts, don’t learn dump questions. Know your stuff,
All the best!
and yeah, Q1 was the OSPF hotspot (4 questions on that scenario)
TG, can you plase paste the link of the OSPF hotspot that you got today? Tx.
Passed ICND2 today with score of 930!! Q1, Q2 (which now I know I got wrong), Q7, Q8 were there.
Passed ICND2 today, Q1,Q2,Q12
Got question 1 but got different questions….
How many Routes are advertised to R1
A. 2
B. 3 (Technically both R3 and R4 will advertise the same subnet Load Balancing possible R2 has one)
C. 4
D. 5
E. 6
How can you prevent or implement Load balancing between R3 and R4
bandwidth (eigrp)
Delay (eigrp)
Cost (ospf)
Priority (ospf)
Passes ICND2 this week, score 944. Really happy about that because it was more difficult than ICND1 as I was a bit nervous. My last question on exam I answered couple minutes before time out! Got many questions which I never seen before anywhere. Thats the reason of time consuming.
Also got question with topology mentioned here in question 1 but I had a version like a Test-let, 4 sub questions. I only remember question for router ID on R1 (the same like q 2 here) and also worse one, something like GL mentioned above:
How many OSPF routes will be shown in R1 routing table if the routing protocol is in default classfull setting? Options were 2, 3, 4, 5, and i think 6 routes.
I was unsure and I guess I chose 2, most probably wrongly.
Studied The Cisco Academy long time ago + CBT + some exam dumps but definitely 9TUT with powerful discussions and explanations helped me the most. Thank you very much 9TUT!
Q 1 and 2 above on ICND2 today. 4 Q’s on the graphic, 1 and 2 above, another asking how many networks would be in R1 routing table.
OSPF is configured using default classful addressing.
With all routers and interfaces operational, how many networks will be in the routing table of router 1, that are indicated to be learned by OSPF.
answers are
2,3, 4, 5, 6,7
Correct Answer is 4
Reason “Learned by OSPF” If you look at the router 1 how many routes does it need to learn? It already knows about its directly connected ones, only those not directly connected are “Learned by OSPF”
Got this a part of my OSPF simlet too… I went with four.
Q1: OSPF sending the full database every 30 minutes? I don’t think this is correct.
Per Odom 640-816, 3rd Ed., p391: “The router that creates each LSA also has the responsibility to reflood the LSA every 30 minutes (the default)….OSPF does not send all routes every 30 minutes. Instead, each LSA has a separate timer, based on when the LSA was created.”
Passed ICND 2 today – 944/1000. Question 1 was on my exam.
Q.1 ,4, 7,8 on the test.
Q1 and Q2 were on ICND2 exam Friday 1 Feb 2012
Q1, 2 and 8 were on my exam today!!
This is a new question added to Q1:
With all routers and interfaces operational, how many networks will be in the routing table of router 1, that are indicated to be learned by OSPF.
answers are
2,3, 4, 5, 6,7
Correct Answer is 4
Can someone please explain why ? or if its the correct answer
@zdemi:
the correct answer is indeed 4. The reason for this is the part of the statement that says:
“that are indicated to be learned by OSPF”
There are 4 networks directly connected to R1, therefore they do not show up as learned by OSPF. Only the networks NOT directly connected would be learned by OSPF, so the OSPF learned networks would be the ones “behind R2”:
172.16.2.64 /30
172.16.2.228 /30
172.16.2.232 /30
172.16.3.0 /24
thanks xedia i took the exam today and passed but i chose 3 probably it wasnt the correct answer
strangely enough, I took the test today, and got the question I helped you on, along with #s 1 , 2 and 6
see there is always a benefits in helping others :)))
Passwed ICND2! 🙂
There was new question, which I didn’t see before:How can you influence OSPF costs? I have chosen: bandwith and “ip ospf cost”. Not sure if that is correct.
Good luck everyone!
Anyone has an answer for the above ????
Taking the INCD2 on March 4th…
Thanks for all the great input and this informative site… this site is well worth my donation.
If anyone has the latest/newest dumps please email them to me @ ( unvmm@yahoo.com).
Thanks in advance!
@qwert
There are three ways that I know to influence the cost in OSPF
1. by changing the bandwidth at the interface mode
2. by using the “ip ospf cost” command at the interface mode
3, by using the “network 10.1.1.0 cost 6000” while in the router ospf (__) global mode
Hi,i just want to ask you one question about ospf.
Q)How many minimum & Maximum Interfaces can be supported by ospf for load balancing?
@Maxwell
4 is the default up to 16 equal cost path.
Passed ICND2 today and had a testlet based on the topology of Q2. OSPF came up quite a bit in my test as did port-security. Know them both inside out. The frame-relay hotspot from 9tut.com CCNA was there too.
@Hazza, do you have a link for the frame-relay hotspot ?
Question 1 was on today’s exam. April 15.
Where can i find latest dumps,pliz email me on gchalwe@yahoo.com writting my CCNA exam on friday,pliz help me
going for exam in 2 week, please send me the latest dump to hussn@yahoo.com
will greatly appreciate. Thanks
There is a new question on this topology asking for configurable values on a router bandwidth cost etc choose 2
sorry Q 1
2, 4, 6,10 and 11 where on the exam today
I had questions 1, 2, AND 7 today!!!! Fair warning 😉
please send link where i am check more qus. about ospf