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Home > Archive > alt.certification.cisco > July 2003 > Sliding Windows question....
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Sliding Windows question....
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| My question at end of study question......
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Which three are examples of the functions of connection oriented
services? (Choose three)
A. Connection parameters are synchronized.
B. Any loss or duplication of packets can be corrected.
C. The data packet is independently routed and the service does not
guarantee the packet will be
processed in order.
D. A data communication path is established between the requesting
entity and the peer device on the
remote end system.
Answer: A, B, D.
Explanation:
In order to establish a connection-orientated service, the connection
must first be established. An example of
this would the TCP/IP suites use of the three-way handshake. The
sending and receiving of synchronization
and acknowledgment packets between the sending system and the
receiving system accomplish a three-way
handshake. Errors can be corrected when the sender does not receive an
acknowledgment, within a specified
amount of time, from the receiving system the packet will be resent.
Incorrect Answers:
C: Due to the acknowledgement of packets, the order that packets are
received is ensured.
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I understand the answer. But I am getting confused as too what was
said about answer C.
If a windows size of 5 is established, then couldnt packets come say
11, 12, 14, 13, 15. I thought it was the host recieving the packets
responsibility to put them back in order if they are out of order.
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| John Agosta 2003-07-26, 8:24 pm |
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"Me" <justanaddress30@hotmail.com> wrote in message
news:f198932f.0307261520.5b143e3d@posting.google.com...
> My question at end of study question......
> ----------------------------------------------------------------
> Which three are examples of the functions of connection oriented
> services? (Choose three)
> A. Connection parameters are synchronized.
> B. Any loss or duplication of packets can be corrected.
> C. The data packet is independently routed and the service does not
> guarantee the packet will be
> processed in order.
> D. A data communication path is established between the requesting
> entity and the peer device on the
> remote end system.
> Answer: A, B, D.
> Explanation:
> In order to establish a connection-orientated service, the connection
> must first be established. An example of
> this would the TCP/IP suites use of the three-way handshake. The
> sending and receiving of synchronization
> and acknowledgment packets between the sending system and the
> receiving system accomplish a three-way
> handshake. Errors can be corrected when the sender does not receive an
> acknowledgment, within a specified
> amount of time, from the receiving system the packet will be resent.
> Incorrect Answers:
> C: Due to the acknowledgement of packets, the order that packets are
> received is ensured.
> ------------------------------------------------------------
> I understand the answer. But I am getting confused as too what was
> said about answer C.
>
> If a windows size of 5 is established, then couldnt packets come say
> 11, 12, 14, 13, 15. I thought it was the host recieving the packets
> responsibility to put them back in order if they are out of order.
You are correct in that the recieving host will put things back in order,
but the process that does this (assume TCP) is connection oriented.
Don't sweat the details. These questions can be picked appart if you wanted
to.
For example, Frame Relay and ATM are considered (by definition/spec)
to be connection oriented, but these protocols don't do any sequencing or
AKing at all.
You seem to have a handle on it. Trust in the force.
Don't worry about 'scores' on these tests.
If anyone tells me they got a perfect score on one of these tests,
I'll look at them straight in the face and tell him that he doesn't know
all of the subject matter. Why ? Because there are too many bogus questions,
and if someone really knows what's going on, they would score "less than"
perfect.
You're on track. Keep plugging away....
-ja
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