Lab/Tutorial :
SEHH2238 : Computer Networking Session 1 : Basic (Solution)
For n devices in a network, what is the number of cable links required for:
1) Topology
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No. of devices
Total No. of Cables No. of Ports per device Total No. of Cables No. of Ports per device
Mesh Ring Bus Star
(9 for Hub)
N(N-1)/2 N N+1 N (backbone)
(N for hub)
Draw a hybrid topology with a star backbone connecting three bus backbones. Each bus backbone connects three ring networks.
SEHH2238 Computer Networking Tutorial 1 Page 1
2) Transmission Mode / Data Flow
1) Communication between a computer and a keyboard involves __simplex__ transmission.
2) A television broadcast is an example of __ simplex__ transmission.
3) The _______ is the physical path over which a message travels.
A) Protocol B) Medium C) Signal D) All the above
4) The information to be communicated in a data communications system is the _______. A) Medium B) Protocol C) Message D) Transmission
5) Network performance is good when throughput is ________ and delay is ________. A) high, high B) high, low C) low, high D) low, low
6) _______ is the protocol suite for the current Internet.
A) TCP/IP B) OSI C) UNIX D) LAN
7) In TCP/IP protocol suite, ________ layer provides reliable end-to-end connection. A) application B) transport C) network D) data link
Additional Questions
1) A color image uses 16 bits to represent a pixel. What is the maximum number of different colors that can be represented? What is the maximum number of characters that can be represented by Unicode?
Each pixel has 16 bits.
No. of possibilities = 216 = 65536 Max.no. of colors = 65536
As Unicode is also 16 bits, the max. no. of characters can be represented is also 65536.
2) A pixel can have 1000 colours. How many bits are required to represent this pixel?
No. of bits = “Smallest integer log2 1000” = log2 1000
= 9.97 =10
SEHH2238 Computer Networking Tutorial 1 Page 2
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