CCNA – 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
Which of the following statements below best describe the process identifier that is used to run OSPF on a router? (Choose two)
A – It is an optional parameter required only if multiple OSPF processes are running on the router
B – It is locally significant
C – It is needed to identify a unique instance of an OSPF database
D – All routers in the same OSPF area must have the same process ID if they are to exchange routing information
Answer: B C
Question 2:
Why R1 can’t establish an OSPF neighbor relationship with R3 according to the following graphic? (Choose two)
A – Configure EIGRP on these routers with a lower administrative distance
B – All routers should be configured for backbone Area 1
C – R1 and R3 have been configured in different areas
D – The hello and dead interval timers are not configured the same values on R1 and R3
Answer: C D
Explanation:
A is not correct because configure EIGRP on these routers (with a lower administrative distance) will force these routers to run EIGRP, not OSPF.
B is not correct because the backbone area of OSPF is always Area 0.
C and D 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 3:
Which items are correct about the routing protocol OSPF? (Choose three)
A – Support VLSM
B – Increase routing overhead on the network
C – Confine network instability to one area of the network
D – Allow extensive control of routing updates
Answer: A C D
Explanation:
Routing overhead is the amount of information needed to describe the changes in a dynamic network topology. All routers in an OSPF area have identical copies of the topology database and the topology database of one area is hidden from the rest of the areas to reduce routing overhead because fewer routing updates are sent and smaller routing trees are computed and maintained (allow extensive control of routing updates and confine network instability to one area of the network).
Question 4:
Which three features are of OSPF routing protocol? (Choose three)
A – Converge quickly
B – OSPF is a classful routing protocol
C – Identify the best route by use of cost
D – Before exchanging routing information, OSPF routers find out neighbors
Answer: A C D
Question 5:
OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Chose three)
A – Each OSPF area requires a loopback interface to be configured
B – Areas may be assigned any number from 0 to 65535
C – Area 0 is called the backbone area
D – Hierarchical OSPF networks do not require multiple areas
E – Multiple OSPF areas must connect to area 0
F – Single area OSPF networks must be configured in area 1
Answer: B C E
Explanation:
I used to think the answers should be C D E and here is my explanation:
OSPF can use an active interface for its router ID, so a loopback interface is not a must -> A is incorrect.
OSPF Area is a 32-bit number so we can use up to 232 – 1 = 4294967296 – 1 (since Area 0 is the first area). Remember that only process ID is a 16-bit number and ranges from 1 to 65535 -> B is incorrect.
F is incorrect too because single area OSPF netwoks must be configured in Area 0, which is called the backbone area.
For answer D, it is a bit hard to guess what they want to say about “hierarchical” but we should understand “Hierarchical OSPF networks” as “OSPF networks”. D is correct bercause we can only have one area (area 0 – the backbone area) for our networks.
But TT commented on 01-11-2010:
Especially to note on choice B, D, and E:
Choice B: we all know that The areas can be any number from 0 to 4.2 billion and 1 to 65,535 for the Process ID. As choice B specifies ‘area’ (be aware, it’s not saying ‘process id), there is no reason to say that we cannot assign numbers from 0 to 65535 for area # (it is using ‘may be’, not ‘have to be’ or ‘ought to be’). Hence, we do not worry about assigning ’0′.
Choice E: as Area 0 is the backbone, we all understand that any areas in a OSPF network have to be connected to it. And actually this is implicitly saying that multiple areas form a hierarchical OSPF network, as Area 0 being a root and others being its leaves.
Choice D: when it specifies ‘Hierarchical’, at least 2 areas should be required to form such topology (of course that includes Area 0)
Although Choice B is not an absolutely accurate statement since it not only can be assigned up to 65535, it is still a correct answer. And again, it specifies ‘area’, not ‘process id’, so ’0′ can be included. Finally, it would be meaningless to call OSPF a hierarchical network if no more than one area is present.
—————————————————————————————————-
I reviewed the question and think it is a more suitable solution with choice B than choice D, surely it is a tricky question!
Question 6:
Part of the OSPF network is shown below:
Configuration exhibit:
R1 routing commands:
ip route 0.0.0.0 0.0.0.0 serial0/0
router ospf 1
network 172.16.100.0 0.0.0.3 area 0
network 172.16.100.64 0.0.0.63 area 0
network 172.16.100.128 0.0.0.31 area 0
default-information originate
You work as a network technician, study the exhibits carefully. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2?
A – Any packet destined for a network that is not directly connected to router R2 will be dropped immediately
B – Any packet destined for a network that is not directly connected to router R1 will be dropped
C – Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1
D – The network directly connected to a router R2 will not be able to communicate with the 172.16.100.0, 172.16.100.28 and 172.16.100.64 subnetworks.
E – Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur
Answer: E
Explanation:
First, notice that the more-specific routes will always be favored over less-specific routes regardless of the administrative distance set for a protocol. In this case, because we use OSPF for three networks (172.16.100.0 0.0.0.3, 172.16.100.64 0.0.0.63, 172.16.100.128 0.0.0.31) so the packets destined for these networks will not be affected by the default route.
The default route configured on R1 “ip route 0.0.0.0 0.0.0.0 serial0/0″ will send any packet whose destination network is not referenced in the routing table of router R1 to R2, it doesn’t drop anything so answers A, B and C are not correct. D is not correct too because these routes are declared in R1 and the question says that “OSPF has been correctly configured on router R2″, so network directly connected to router R2 can communicate with those three subnetworks.
As said above, the default route configured on R1 will send any packet destined for a network that is not referenced in its routing table to R2; R2 in turn sends it to R1 because it is the only way and a routing loop will occur.
OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Chose three)
A – Each OSPF area requires a loopback interface to be configured
B – Areas may be assigned any number from 0 to 65535
C – Area 0 is called the backbone area
D – Hierarchical OSPF networks do not require multiple areas
E – Multiple OSPF areas must connect to area 0
F – Single area OSPF networks must be configured in area 1
Answer: B C E, i think answer should be C,D,E
correct answer for Q.5 is B,C,E. variant B just confuse us..it is kind of tricky question..
if it was written like this ” Areas must be assigned any number from 0 to 65535″,it would be wrong answer..without hesitation we can say C,D,E is correct..but i think answer is B,C,E..
im confusing now,what should i do if this question pops up on exam?))
plz send me the latest Dumps
altango78@hotmail.com
where is the picture of qustion ???
The answer to question 5 is CDE because area’s are assigned number from 0 to something like 4.2 billion and the AS is assigned for 1 to 65535 so B is the wrong answer and D would be the right answer because its the one that makes the closest argument to the question and is actually in Lammle book 7th edition.
Can anyone tell me what a dump is and apparently provide me with such a item since everyone wants one?
michaelellis193@msn.com
area in ospf protocol is 16 bits length in OSPF packet thus the value we can obtain from 16bits ranges 0 to 65535. B is correct!
D is not correct because we cannot create hierachical networks with just one area. hierarchical networks in ospf means that in the same network there is an hierarchy ie the most to the less. the most in ospf is area 0. with one area on a network there is no hierarchy!
hi, latest dumps
hani_2012_rad@yahoo.com
Can anyone explain this one?
http://postimage.org/image/t13c1reyz/
Hi, latest dumps please.
Simplymerainer@gmail.com
Hi,
Much appreciate if any one could forward the latest dumps to mtaha11@hotmail.com
Thanks in advance. I am looking forward to take the exam after two weeks.
As for the guy who sent in the picture…it really is B. Look at the bandwidth and delay number. the bandwidths are very similar, and when dividing into 10^7 will give a very similar number. but, the delay differences are significant since the delay will be multiplied by 256. therefore, B.
@Anybody
@9tut
Whether can we use tab key to fill the full cmds??
Also can we use shortcut cmds in exam like we use in gns3 or packet tracer??
eg:sh run, sh ip int br, sh ip rout…
thanks.
I didn’t find a question a need the answer for it here
can you have look at the screenshot
http://i47.tinypic.com/2znzw5x.png
I think it should be B please can anyone explain that for me, I have exam on friday
thanks
Hi, guys.
Do any of u have the link to Prepking 640-802 680q brain dumps?
We need it for preparations for the exam.
Thanx.
Dear Nana
why you just don’t google it ;)
http://lmgtfy.com/?q=Prepking+640-802+680q
TY 9tut.
Today I have passed the CCNA. (860/825)
50 questions 3 labs (VTP, EIGRP, ACL). 35 from 9tut.
Also thanks a lot Brar and Sekhar (still valid from examcollection)
Ty again 9tut
from here Q 2
hi can some one explain if Q2′s answer c is correct???? i believe only d should be the answer. what say?
Please disregard
Q2
in the question they asked for 2 choice! So of that D is the first choice and now compare between remaining three option. From that you clearly understand that C is the winner, and the image is not appropriate.
Please Anyone Send Me latest CCNA Dumps My Id IS Shakernice@gmail.com
Latest dumps pls! bosunoke@gmail.com
Thanks to 9tut , CBTnuggets and the dumps . I have passed ccna with 960 today and acl2 , Eigrp with VTP were the labs . Thanks GOD for this relief !!!
I think the answer is CDE. Only one area required for a hierarchy…area 0 and then the hierarchy would go up to the AS. I don’t think it means area to area hierarchy. It’s area to AS hierarchy.
I am reading the CCNA fast pass book in conjunction with this site. According to the book, question 5 is wrong. It states on page 254 that there areas can be configured from 0-4.5billion and the process ID is from 1-65,535. So which is correct? Is there a possibility that the question on this site was mistyped and meant to say process id instead of area?
Nevermind. I read the answer wrong. It says, “may be assigned” so it is valid.. Nice!
question no 6 is wrong choice can anybody suggest
For question 5, the option D.
D – Hierarchical OSPF networks do not require multiple areas
Network summarization in OSPF can only be done in ABRs (Area Border Router), so when using multiple areas is when is actually helpful to use Hierarchical networks.
Hi there. Taking CCNA in a weeks. Can anyone send me latest dumps? gugunwasp@gmail.com? thank you!
plz send me the latest Dumps
mariovalidzic1@gmail.com
I have an issue with question 6. “Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1″
Why would R2 send the packet back to R1 if there is no entry for the destination network in the routing table. You are assuming R2 has a default route to R1 and that cannot be determined by the information supplied.
q 1 and 5 from here
With this page I’m sure to pass my CCNA!!!
Hi There
Taking CCNA nexts month. Can someone please send me the latest dumps rivers20032001@yahoo.com
@bob smith.
when you use the ‘default-information originate’, R2 learns there’s a default route in R1, so it adds an entry to the routing table with a default route via R1
@Question 5
I had a similar question in Todd Lammle study guide, however it was area ranges from 1 – 65535. and has D as the correct answer. Just depends if it starts with 0 or 1
can anyone tell me the best method to learn cuz there’re alot of question
I’m very pleasure to make friend with you, i’m going to take an exam next month, so if you want to learn with me pls contact to me
Websites we think you should visit we like to honor many other inenetrt sites on the web, even if they aren’t linked to us, by linking to them. Under are some webpages worth checking out
that, a subsidiary role is polsibse for the book. If you already run a network, which might have Cisco hardware, and you need a solid reference on routing protocols, try using this. It explains the common protocols at a level deep enough and suitable for a network administrator. And of course, while the protocols are meant to be implemented the same way, regardless of vendor, when it comes to the diagnostic output from Cisco hardware, the book is relevant to what you should see.Help other customers find the most helpful reviewsa0Was this review helpful to you?a0 | a0 Q.D. “Q.D.” says: 1 of 1 people found the following review helpful very good, February 28, 2008Bya0 (Milwaukee, WI) Amazon Verified Purchase() This review is from: Love the text, with the answers to questions in back you can check yourself easily.Help other customers find the most helpful reviewsa0Was this review helpful to you?a0 | a0
That is simply maloulrves, and the resulting output is truly stunning. Well done!I notice that you have added fans to the motors. They sure do get hot after a while. I managed to melt a plastic hose on one of mine, so I will be adding fans too.Great work on your machine.
This doesn’t work for me if I copy and past a url into the browser. It uepatds the browser url fine if I start from the root and navigate around the site. However, if I try to deeplink to sub section e.g. mysite/subsection I get the following error:Uncaught SyntaxError: Unexpected token < vendor.js:1Uncaught SyntaxError: Unexpected token < app.js:1Uncaught ReferenceError: require is not defined Do you have this issue at all?
could u please send me the lastest dumps for CCNA exam ( mwasimirshad@yahoo.com )
thanx in advance…..
I am going to take ccna exam on 12th of april.and i heard that cisco redesigned the exam. So i just want to know that is there any changes in the ccna syllabus or exam pattern.? Please reply thanx in adv.
I saw on another page: ” exams will have an end-of-life date of September 30, 2013 “.
I´m going to take exam on April 4th, so we are ok dude. Regards from Mexico.
Hello. I have a few questions:
1- priority is related to the interface. If one router has two interfaces with different priorities in one OSPF area, how are the DR/BDR elected ?
Let’s say we have R1 with 2 interface (prio 10& 20), R2 with 1 interface (prio 15) and R3 with 1 interface (16). We suppose that all 3 get rebooted at the same time. The DR will become R1 because he has an interface with OSPF priority 20 ?
What happens if we have the above case but only interface 1 from R1 is in OSPF and has priority of 10 ? Who is elected DR ?
More: let’s assume that all R1,R2 and R3 have equal priorities and no loopback interfaces defined. The RID is the highest IP address of any interface (active) from the router participating in the OSPF or just any interface at all ?
thank you in advance for your answers.
Hey, Anybody who has latest CCNA Dumps kindly mail at andkro87@hotmail.com
Thank You :)
Please send lastest dumps for cnna at cooltech1990@gmail.com.. Thanks in advance
Please send lastest dumps for ccna at cooltech1990@gmail.com.. Thanks in advance
please send the latest dumps for ccna to jasonle2k@yahoo.com
thanks a lot
Q1
should be Aand D correct not C as we can see all three router are in the same are 0 , A is correct because routers with a lower administrative distance will force these routers to run EIGRP, not OSPF so that way the administrator can not a establish OSPF .