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2010 Spring, Computer Networks, 00, Midterm Exam
2010/04/00, Wed, 9 problems
1. Please write your student number, class number and name (10).
2. Explain the following words briefly. (30)
(다음의 단어들을 간략하게 설명하라.)
(a-2) protocol
A pre-defined response on a given action between entities
(b-2) peer-to-peer model
Each peer may be server or client, not having a fixed role
(c-2) TDM
Time Division Multiplexing: only the slot owner has a permit to send a packet. Thus all nodes in the network should share the scheduling information among them.
(d-2) packet-switching network
Statistical multiplexing, each host transmits its data in the unit of packet (data junk).
(e-2) propagation delay
The time for the first bit to arrive at the destination from the source
(f-2) network congestion
In the packet switching network, the router cannot store all incoming packets due to the limit of queue(memory). Thus, late-incoming packets will be lost.
(g-2) best-effort
Packet switching network does not guarantee any services such as rate and delay.

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