CCNA - 3 questions to comment on/think about

Author

3 questions to comment on/think about

andersson

2002-07-16, 4:32 pm

Hi there,

I am writing the exam next week and am feeling pretty solid with the amount of study I have put in so far.

There are a few questions that I am not 100% on though, so I am hoping to gather some feedback on whether I am off base with my thoughts.

I welcome any feedback/discussions & would be grateful for any advice along the way.

Many thanks.

1. What are four function/characteristics of the network layer of the OSI model?(Choose four)
A.It uses a two-part address.
B.It maintains routing tables.
C.It uses broadcast addresses.
D.It establishes network addresses.
E.It provides access to the LAN media.
F.It provides media independence for upper layers.
G.It provides path selection for Internet work communication.
Answer:A,B,C,G

I am a little confused as to D. I know that network addresses play a big part in this OSI layer, but I am not sure the wording of this question does it justice. Anyone?

2. What are the advantages of using the OSI layered network model? (Choose three.)
A. Allows multiple-vendor development through standardization of network components.
B. Creates a list of communication rules that all companies must implement to get onto the Internet.
C. Allows various types of network hardware and software to communicate.
D. Prevents changes in one layer from affecting other layers, so it does not hamper development.
E. Allows companies to develop proprietary interfaces.
Answer: A, C, D

I have seen a lot of people saying that E is an answer as opposed to C. I personally cannot see how that is the case. ‘Proprietary’ means particular to that company’s product, so to speak, eg HDLC is cisco proprietary. I would have though that an ISO standard would allow companies to develop interfaces that went beyond being proprietary?

3. Which of the following WAN services use two data link layer encapsulations, one for data and one for signaling?
A. ISDN
B. Frame Relay
C. ATM
D. FDDI

This one puzzles me! Both ISDN & Frame Relay employ signalling, so which is it??? I am sure it is to do with the Data Link encapsulation, but I have yet to work it out for sure.

Thanks in advance.

jeff_j_black

2002-07-16, 9:12 pm

Read a book?

andersson

2002-07-17, 12:59 am

I thought people were supposed to help each other out here?

It's not like I have posted 30 questions verbatim & am looking to be spoon feed the answers. I am just after a little constructive feedback.

Sorry if I am not as up to speed as you Jeff. We all have to start somewhere remember.

pomerol82

2002-07-17, 2:31 am

1) why C? Broadcast address?
2) I agree with you
3) Layer two for ISDN : D channel - LAPD(q.921); B channel : LAPB/PPP/HDLC/FR

100114

2002-07-17, 3:56 am

I Do Agree that the Forum is to help Each other with some Knowledge Sharing ..not that Make it a braindumps Site but ..if this Forum was only for knowing who passed and scored how much .. then i think we have better things to do...
From the Ocean of Knowledge lets share some ..

andersson

2002-07-18, 4:25 am

Thanks pomerol82.

The reason that I am a little sketchy about C or D is that the network layer does use broadcast addresses. For instance, if you were on the 192.168.1.0/24 network, a broadcast address would be 192.168.1.255 (all 1's in binary). That is a fact.

However, does the network layer actually establish network addresses? I am not so sure. It surely uses network addresses, but establish them? I would most likely agree with either C or D, except that one of these MUST be incorrect, as the other answers are spot on and there are only 4 possible answers.

See my dilema now?

Thanks in advance.

pomerol82

2002-07-18, 7:08 pm

Please be noted that it is a question concerning concept but not specific case. Generally, "broadcast" does not commonly refer to layer three as you know that layer three segments broadcast domain (vlan can do as well but need inter-vlan routing between vlans).

Routing & determining of "Network address" are functions of layer three.

It is a good studying attitude that does not satisfly merely the answer but also reasons behind.

Please be reminded that these kinds of questions may be in wrong for wording or even entirely. Just only take them as "dessert".

stautzenberger

2002-07-23, 10:10 am

2. What are the advantages of using the OSI layered network model? (Choose three.)

A. Allows multiple-vendor development through standardization of network components.
B. Creates a list of communication rules that all companies must implement to get onto the
Internet.
C. Allows various types of network hardware and software to communicate.
D. Prevents changes in one layer from affecting other layers, so it does not hamper
development.
E. Allows companies to develop proprietary interfaces.

This is a tough question, but "E" is not correct in this question, although the OSI layered network model does allow that. But is that really an advantage to why we use the OSI? Nope. Answers, A, C and D are better answers to the advantages of the OSI.

Hope this helps.
Cheers!
Todd Lammle

andersson

2002-07-23, 10:44 am

pomerol and stautzenberger... guys, thanks for your feedback and supportive attitude. I passed the exam the other day with a stonking 987. well pleased. as for others that have nothing better to do than hang out in these forums and make snide remarks - get a life. enough said - I am in celebration mode.

good luck to all.

Wiza

2002-07-23, 2:18 pm

Nice! Great work. Not that you care too much at this point, but the OSI provides the standard interface for plug n play multivender intergration not a means to come up with thier own interfaces.

And I agree, what a smug self-envolved jerk to take the time to reply with, "read a book"
And that's what HE said.

jeff_j_black

2002-07-23, 5:13 pm

Out of almost 600 posts that I have made on this board, you'll find a pretty good portion of them to contain information, another good portion of the to contain some decent questions, quite a few encouragements, many acknowledgements and yes a bunch of smart axx comments as well.

quote:
what a smug self-envolved jerk

quote:
as for others that have nothing better to do than hang out in these forums and make snide remarks - get a life.

You two are running at least 16% and 13% repectively, go through all of my posts and give me the percentage then we can get critical.

It just seems the whole cert circuit on the web has been flooded with pleadings for dumps, cracks, verbatim display of copyrighted material, especially the CCNA discussion. Hey, in hind sight I was harsh and I applogize. You certainly put in a great score. Congratulations.

andersson

2002-07-24, 8:05 am

nice one wiza!

thanks for coming back to me also.

andersson

2002-07-24, 8:08 am

alright jeff. appreciate the words. I guess I can't really comment on other feedback as much as that directed at me.

at any rate, I was only looking for feedback.

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