1. For HDLC:
(a) Please draw and describe the frame format. (5%)
(b) Please detail explain the contril field. (5%)
(c) Other than I-frame, what are the other types of frames? What are the
function of each type of frame? (5%)
2. For OSI 7-layer architecture:
(a) Please describe the major functions of Layers 2, 3, and 4. (10%)
(b) Explain the difference between the flow control of Layer 2 and the
flow control of Layer 4.
(c) Explain the difference between congestion control of Layer 3 and the
flow control of Layer 4.
3. Please explain what is "Manchester Encoding". How can this encoding
mechanism help Layer 2 framing? (10%)
4. Please explain the following:
(a) The difference between "circuit switching" and "virtual circuit
switching"? (5%)
(b) What is "frequency reuse" in wireless cellular communucation? (5%)
(c) What is the difference between ARQ and FEC (Forward Error Control)?
(5%)
5. Given the sequence number has 7 bits, what is the maximum sliding window
size for selective repeat? Why? Give examples to explain. (5%)
6. For IEEE 802.3 and Ethernet:
(a) Why IEEE 802.3 needs a "Frame Length" field? (5%)
(b) Why Ethernet uses the "Frame Length" as "Packet type"? (What is the
purpose?) (5%)
(c) What is the purpose of "Preamble"? (5%)
(d) Please explain "Binary Exponential Backoff". (5%)
(e) What is the difference between 1-persistent CSMA and p-persistent
CSMA? (5%)
7. Please explain how token ring implement "Priority transmission". (Please
explain gow can higher priority packets transmit earlier than lower
priority packets.) (10%)
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