CCNA question about ISO model

Unanswered Question
Nov 25th, 2010
7.
Hi,
I never really could figure out the two following questions:
The process of HTTP asking TCP to send some data and make sure that it is received correctly is an example of what
1.a) Same-layer interaction
2.b) Adjacent Layer interaction
3.c) The OSI model
4.d) All of the above
5.
Doest adjacent layer interaction means that that HTTP application layer 7 would be right under the TCP transport layer 4 which does not seems to be case since application 6 & 5 are those who are directly below application 4.  Why OSI model can't be the answer?
The process of TCP on one computer marking a segment as segment 1, and the receiving computer then acknowledging the receipt of segment 1, is an example of what?
a) Data encapsulation
b) Same layer interaction
c) Adjacent Layer encapsulation
d) The OSI model
e) None of the above
Does this question refers to the definition of TCP (transport layer 4) to provide reliable communication using acknowledgement.
Thanks
Stephane
e) None of the above
I have this problem too.
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Jon Marshall Fri, 11/26/2010 - 02:01

Steph1963 wrote:

7.
Hi,
I never really could figure out the two following questions:
The process of HTTP asking TCP to send some data and make sure that it is received correctly is an example of what
1.a) Same-layer interaction
2.b) Adjacent Layer interaction
3.c) The OSI model
4.d) All of the above
5.
Doest adjacent layer interaction means that that HTTP application layer 7 would be right under the TCP transport layer 4 which does not seems to be case since application 6 & 5 are those who are directly below application 4.  Why OSI model can't be the answer?
The process of TCP on one computer marking a segment as segment 1, and the receiving computer then acknowledging the receipt of segment 1, is an example of what?
a) Data encapsulation
b) Same layer interaction
c) Adjacent Layer encapsulation
d) The OSI model
e) None of the above
Does this question refers to the definition of TCP (transport layer 4) to provide reliable communication using acknowledgement.
Thanks
Stephane
e) None of the above

Stephane

Question 1 - the confusion comes because the TCP/IP model does not map onto the OSI model. T

The OSI model as you say has 7 layers so HTTP is at the application layer which then goes to the presentation layer then to the transport layer.

The TCP/IP layer only really has 4 layers - physical/network/transport/application. So with the TCP/IP model b) could ideed be the right answer whereas with OSI strictly speaking it wouldn't.

Question 2 - i would say same layer interaction myself.

Trouble with these sort of questions is different people read things differently and even when the right answer is known there is still scope for disagreement

Jon

Steph1963 Mon, 11/29/2010 - 06:58

Hi Jon,

Thanks, never thought about the TCP/IP mode.  Make sense now...

Thanks again

Stephane

Brian Schoonover Wed, 12/15/2010 - 09:54

These question were referring to "same-layer" interaction and "adjacent-layer" interaction.

Taking the first question, the process of HTTP asking TCP to send some data, is an example of "adjacent-layer" interaction.  Adjacent-layer interaction takes place between layers on a single host.  Therefore, the answer to the first question is "b".

Taking the second question, the process of TCP on one computer making a segment as segment 1 and the receiving computer acknowledging the receipt of segment 1, is an example of "same-layer" interaction.  Same-layer interaction takes place between like layers on two hosts.  Therefore, the answer to the second question is "b".

HTH

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