1. What physical topology change would occur if you upgraded a LAN from 10BASE2
ID: 3575761 • Letter: 1
Question
1. What physical topology change would occur if you upgraded a LAN from 10BASE2 to 10BASE-T?
a. Change from tree to star.
b. Change from star to bus.
c. Change from bus to star.
d. Change from star to tree.
2. The maximum window size in TCP's sliding window scheme is:
a. 2^8 - 1
b. 2^16 - 1
c. 2^24 - 1
d. 2^32 - 1
3. 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.
9. The address field of a frame relay frame will always end with a binary 1. True/False
10. The 7-bit ASCII value for a lower case u with an even parity bit added is 11001011. True/False
11. The data field of an Ethernet frame must be at least 64 octets long. True/False
12. Ethernet Frames should not exceed 1526 octets in length. True/False
Explanation / Answer
Please follow the data and description :
1)
For physical topology change that would occur if you upgraded a LAN from 10BASE2 to 10BASE-T is to Change from tree to star.
So the answer is OPTION A(Change from tree to star.).
2)
The maximum window size in TCP’s sliding window scheme is:
2^16 – 1
So the answer is OPTION B (2^16 – 1)
9) The address field of a frame relay frame will always end with a binary 1. Yes the last frmae of the data always end with a 1. So the answer is TRUE.
11) The total length of an Ethernet LLC frame must be at least 64 octets in length. So it is TRUE.
12) The total length of an Ethernet LLC frame must be at least 64 octets in length. Yes it is the maximum lengtht that could be obtained. So the answer is TRUE.
Hope this is helpful.
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