1) Which of the following is NOT true?

A. Traditional packet switching is likely to involve more end-to-end retransmissions than fast packet switching.
B. Traditional packet switching is likely to have higher overhead due to node processing delays than fast packet switching.
C. On a reliable network with a low bit error rate, fast packet switching is likely to have higher throughput than traditional packet switching.

2.Which of the following is NOT true?
Student Response
A. The DS-0 transmission rate is 64 kbps.
B. A T1 circuit can carry 24 PCM or 48 PCM voice signals.
C. A DS-1 frame has 30 8-bit DS-0 channels.
D. A T1 circuit has a transmission rate of 1.544 Mbps

3. Which of the following is NOT true?

A. An OC-1 circuit can carry 28 DS-1s.
B. An STS-1 frame has 9 rows and 90 columns, and each column is 1 octet wide.
C. An STS-3 frame has 27 rows and 90 columns.
D. 8,000 frames are transmitted per second on an OC-3 circuit.

4.If each of 8 secondary stations on a multipoint link is polled once per cycle using roll-call polling, how many primary-secondary propagation delays will contribute to the polling cycle time?
Student Response
A. 2
B. 8
C. 9
D. 16

5. Which of the following is NOT true?

A. FDM allows a high capacity analog circuit to carry multiple signals.
B. A TDM channel contains one cycle of time slots.
C. If terminals A, B, and C are sharing a circuit using TDM and A's data rate is twice that of B and C, then A would be assigned 2 time slots per cycle, and B and C would be assigned 1 time slot each.
D. Inverse multiplexing allows 1 high speed signal to be transmitted over multiple lower speed circuits.