networking

NIC stands for

• networking interface card

• network interface communication

• network interface card

• networking interfacing card

List the two types of network topologies

(a)  

Name the parts marked A and D as shown on the picture

(a)  

Which of the following is not an advantage of fibre optics

• o   It is immune to electromagnetic interference, and eavesdropping.

• o   It is fast and supports high bandwidth

• It is small & light

• It has high attenuation

Answer explanation

o   It has low attenuation; hence, a long distance can be covered

state the three modes of communication

(a)  

Answer explanation

Simplex transmission – refers to communication

in only one direction e.g. radio transmission.

 Half duplex – refers to communication in both

directions but one direction at a time e.g. police

walkie talkie.

 Full duplex – in this transmission communication

occurs in both directions simultaneously e.g.

computers connected in network.

which of the following is not a part of a fibre optics cable

• The core

• Cladding

• Jacket

• dielectric insulator

list three computer networks

(a)  

In ring topology flow of packets/ data is said to be unidirectional..

• true

• false

which of the following is not a purpose of networking

• different computers

  are connected to

  each other hence a

  user at one site may

  be able to use the

  resource available at

  another site e.g.

  printers, programs etc.

• data and information held on a network is prone to

  more illegal access, danger of data theft and also tapping by

  unauthorised people during transmission.

• if a particular process can be

  sub-divided into several sub-process then each sub-

  process can be processed at different sites co-currently

  hence speeding up the entire process.

• if one site fails in a computer network, the

  remaining site can potentially continue operating.

how many layers are there in the OSI model

(a)  

Answer explanation

Network protocols

are designed after the open system

interconnection (OSI) model. The

open systems interconnection model

is not a protocol as such but is

meant to help designers to come up

with high quality layered protocol it

has seven layers, each performing

distinct functions