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.
Hi
Does anyone know if the following brain dumps are still valid as I am writing on the 23 March 2011.
Cisco.GoAndPass.640-802.v2010-05-21.by.Mashti.354q.vce
Hi
Does anyone know if the following brain dumps are still valid as I am writing on the 23 March 2011.
Cisco.GoAndPass.640-802.v2010-05-21.by.Mashti.354q.vce
Irvin
I think question 5 answer B is correct !!!
You can assign the area number in the range of 1-4294967296.
So as long as the area number is within this range , in our case 0 to 65535, the answer is correct. Remember that the questions says : ” may be assigned”
Hope it helps :D
I think question 5 answer D is correct
i saw this question on Sybex book and i see he answer question 5 is D not B
i hope anyone tells the correct coz i’m going to write exam on sunday 27/3
Q5:
Don’t be confused on “what is the range of an Area?” since there is no one asking for the range of Area—> so if no one is asking for the range for The area(32-bit), then YES You can assign any number from these 0-65535 to an area( since 65535 in less than 4294967296).
EX. if we say you can give some one 0-600 things, but not more than 600 things. Then there is nothing stopping you from giving 0-400 things to some one or 0-34 and so on.
OSPF configuration
http://www.youtube.com/user/kingabena?feature=mhum#p/a/u/1/JxF_K9Tgfys
http://www.youtube.com/watch?v=JxF_K9Tgfys
@sergio
I’ve been researching this for the past hour and haven’t found a clear explenation nor errata.
I believe F is wrong because it concerns PVRST+ and the output for “show spanning-tree vlan 30″ concerns VLAN30 only. So no info available in that output concerning other vlans and their respective roots. And that would leave “A” as right answer as these are the only port states known to RSTP.
If anone can verify this, pls do.
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Q6.
The answer is quite simple. The default route 0.0.0.0 0.0.0.0 is set up on S0/0 which is connected to R2 and not the ISP which is on S0/1
Hence the loop. R2 sends to R1, R1 says if I don’t have a route for this send it out on S0/0. R2 has the packet again, he send it back to R1, the cycle begins.
HI
Is it true dat CCNA questions n SIMS get changed after June. n some new qusetions r goin to be asked. I read in one of the forums dat cisco is goin to do so.
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
Question 1
OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? (Choose 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. C D E
which is correct ?
hey guys I have been going over Actualtests Version 4.2 PDF I wonder if this is a good study material. I have a bachelors in networking and have been studying on the concepts behind eigrp ospf routing and switching but on the test I was hit with questions that got me thinking with little time. Im retesting in two weeks and I hope I do good
Hi can someone send me the lastes dump please. kbettsx@yahoo.com
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please anybody send me latest dumps for ccna 640-802 on my email id please.. pleas…
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regarding question 6 will R2 AND R1 make neighbour relationship or not and will default route be advertised through OSPF or not …
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hi 9tut,
Please confirm following question that asked so many times in this forum and i’m still confusing
http://i56.tinypic.com/4jqfev.jpg
A. Router R2 will not form a neighbor relationship with R1.
B. Router R2 will obtain a full routing table, including a default route, from R1.
C. R2 will obtain OSPF updates from R1, but will not obtain a default route from R1.
D. R2 will not have a route for the directly connected serial network, but all other directly connected networks will be present, as well as the two Ethernet networks connected to R1.
In acme , “A” is right. But TIS_640-802_v21.24_436Q , “B” is right. I tested this question in packet tracer , I found not only ospf but also default route in R2. So , “B” is right ? And I checked “sh ip protocols” in both routers , the default routing protocols is “OSPF”, so does mean the default route in R1 won’t work.? if yes, the routing loop won’t occur , it is my vision. Please choose correct answer for everyone !!
Hi 9tut,
Which answer is true ? acme said ” C” , TIS_640-802_v21.24_436Q said ” B”.
Refer to the exhibit. A router boots to the prompt shown in the exhibit. What does this signify, and how should the network administrator respond?
Exhibit: rommon 1>
A: This prompt signifies that the configuration file was not found in NVRAM. The network administrator should follow the prompts to enter a basic configuration.
B: The prompt signifies that the configuration file was not found in flash memory. The network administrator should use TFTP to transfer a configuration file to the router
C: The prompt signifes that the IOS image in flash memory is invalid or corrupted. The network administrator should use TFTP to transfer an IOS image to the router.
D: The prompt signifes that the router could not authenticate the user. The network administrator should modify the IOS image and reboot the router
please answer my above question ASAP, b’cause I’m planning to take CCNA exam next week.
@prettykid, C is the correct answer for rommon 1> question.
reference
http://www.cisco.com/en/US/products/hw/switches/ps663/products_configuration_example09186a0080094ecf.shtml
@newbie4
Thanks !! how about ospf question?
Passed my test with 907 today … feelin super good right now finally the few … the proud…. the geeks i mean CCNA grads lol
@Bigthar BCE is the correct ans.
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Thanks
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Hello Every Body
Q 5 answer B Is Absolutely right the key in this answer was
Areas “” may be”” assigned any number from 0 to 65535 and that is right i can use any number from 0 to 65535 or above this number also becouse it said ” May BE ” And it will be wrong if it said “MUST BE ” this is the key of the trick
1) What information does a router running a link-state protocol use to build and maintain its topological database?
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 desginated routers
Ans: A & C
My ques : why not E???
Someone plzzz. provide some light to my poor concept about Link-state routing protocol
@Mohamed..
This ques has been also given in CCNA book by Sybex publication….and i found that
Ans C D E are correct…
I hope author Todd lamale is not wrong…
So go for ans C D E
what does it mean ospf confines network instability to single areas of the network…
thanks
@Yanjan: To answer your question “Why not E?”, it’s because each link-state router builds it’s own personal routing table using information that it receives from other routers contained in Hello packets and LSA’s. It puts all this info into the SPF algorithm and out pops the only routing table it needs.
@ Floccinaucinihilipilification: You ask an important question. Because OSPF can be made up of many areas, Area 0, Area 1, Area 2 and so on depending on the size of the network, if somebody completely messes up the configuration on a router in, say Area 2, then the only part of the network that will go completely bonkers is Area 2. Area 1 and Area 0 will never know that there is a problem in Area 2. If they have packets to send to Area 2, they will happily keep sending these packets. The instability of the network is contained in Area 2.
@Yajan,
E.routing tables received from other link-state routers <– this not correct, i think routing tables only sent by DR/BDR, not any other routers
Can someone help me with this one?
http://i54.tinypic.com/2im2p0z.jpg
Refer to the exhibit. Why was RouterA not elected as the designated router?
A. The OSPF process ID of RouterA is lower than the process ID of the elected DR.
B. RouterA has a lower OSPF priority value than the router elected as DR.
C. The interface address of RouterA is a higher value than the interface address of the DR.
D. RouterA is not advertising the interface with address 221.130.149.10.
Every dump I have seen indicates that answer D is correct. However, I think the exhibit clearly indicates that 221.130.149.10 is advertised and the reason RouterA is not elected DR is answer B. RouterA has a lower OSPF priority… exhibit indicates priority is 1.
Any thoughts? It is driving me crazy.
Hi guys
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we do not know the routing table for R2. maybe it dowsnt have a default route to R1 configured on it so it might drop some packets forwared by R1 and hence no routing loop
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Taking the test soon, gracias!!
pass today 954
ACL2 and eigrp and vtp sim
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