What is the magic number (give your answer as a number, no commas or decimal)? 4
ID: 3579538 • Letter: W
Question
What is the magic number (give your answer as a number, no commas or decimal)?
4. TCP uses ...
a. stop and wait flow control with stop and wait ARQ error control
b. stop and wait flow control with go back N ARQ error control
c. sliding window flow control with go back N ARQ error control
d. sliding window flow control with selective reject ARQ error control
5. An engineer has designed transmission equipment to transmit 7200 symbols per second while encoding 8 bits per symbol. If the signal to noise ratio is 400:1 and the channel bandwidth is 3625 Hz, has the engineer's design exceeded theoretical limits?
a. Yes, both the limit on symbol rate and the limit on bits per symbol have been exceeded.
b. Yes, but only the limit on symbol rate has been exceeded.
c. Yes, but only the limit on bits per symbol has been exceeded.
d. No, none of the theoretical limits have been exceeded.
6. What is the minimum back off time for an ethernet line card that has experienced 9 collisions in a row?
a. 0 micro seconds
b. 51.5 micro seconds
c. 26,316.5 micro seconds
d. 26,368 micro seconds
e. 52,684.5 micro seconds
f. 52,736 micro seconds
g. 55,684.5 micro seconds
7. Select the protocols below that do not offer error correction service ...
a. Frame-relay.
b. Internet Protocol.
c. Transmission Control Protocol.
d. Trivial File Transfer Protocol.
8. A frame relay frame arrives and the address field is 1101001001001011. Mark the statements below that are true regarding this frame.
a. This frame encountered congestion.
b. The frame tells the receiver it needs to slow its own transmission rate.
c. The sending station exceeded its CIR.
d. The receiver should set the BECN bit in its reply to notify the other end to slow down.
Explanation / Answer
4. TCP uses sliding window flow control with go back N ARQ error control (c).
sliding window protocol are required where reliable in order delivery of packet is required.
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