communications

Question 1

define network

Answer 1

is the exchange of information and ideas among people with a common profession or special interest.

Question 2

define internet

Answer 2

a global network providing communication facilities.

Question 3

network more

Answer 3

when two or systems are connected through wire or wireless

Question 4

name and describe the advantages of using network

Answer 4

file sharing :users can share files with other users
hardware sharing: users can shore hardwares such as printers.
software sharing: users can shore software applications.
communication: users can send mail or chat,

Question 5

disadvantages of using network:

Answer 5

cost:additional equipment would be required
management:ntechnetwork requires management from technical stuff.
malware: virus can easily spread through improperty
secured network.
hacking:once a divice is connected to another device,itis easier tack.

Question 6

two types of network

Answer 6

LAN ,WAN

Question 7

define network

Answer 7

when two or more systems are connected through wire or wireless

Question 8

define local area network

Answer 8

a network connecting computers in a single room, in a single building

Question 9

define WAN

Answer 9

a network connecting computer on different sites, possibly thousands of kilometers apart.

Question 10

draw (1)client server (2)peer to peer

Answer 10

search google

Question 11

define server

Answer 11

a server is a computer or system that provides resources, data to other computer known as clients
eg:
file server
print server
proxy server
web server
application server

Question 12

what is meant by a client-server model of networked computers?

Answer 12

– at least one computer used to “serve”
–other computer are referred to as ‘client’
–other computer are referred to as “client”.
–server provides services/application

Question 13

*downloading a file from a website is an example of a client-server application .

what is meant by the term client-server?

Answer 13

–the file is made available from web server
–the users browser is the client software
–the client (software browser) requests the file from the server
–the desired file is returned to the client computer

Question 14

*bank has a client-server model of networked computers

describe using the bank as an example the key features of a client -server model?

Answer 14

–the bank’s server holds the customer account data
–and performs the requested task
–the computer used by the customers are the clients
– that send requests to the server
–which returns the results of the request
–e.g a customer asks for a list of recent transactions on their account.

Question 15

how client server model enables the employees to access same files from different computers?

Answer 15

– the employees computers are the client
– the server hosts the shared file
– an employee can request a file (from the server) from any of the client computers
–several employees can access the same file (on the server)at the same time

Question 16

benefit of client server

Answer 16

– files and resources are centralized (controlled by organization)
–creation of security/manage of security
– centralized back up (process that involves replicating data to server)
–internet monitoring
–clients can less powerful machines, therefore less expensive to buy
–saving resources on server reduces the burden on the client

Question 17

describe the key features of peer to peer network?

Answer 17

–all computers are of equal status
–each computer provides access to resources and data
–computers can communicate and share resources
– each computer is responsible for its own security

Question 18

benefits of peer to peer

Answer 18

–it avoids possibility of congestion when more clients are simultaneously requesting to download a file
–it allows user to download different parts of files separately.
– the parts are available from more than one host

Question 19

describe drawbacks of peer to peer

Answer 19

–reduced security,each computer is at risk from viruses from other computer
–co central management of backup, if the data from one computer is not backed up it is lost to all of them.
–no central management of file, consistency may be difficult to maintain
–individual computers may respond slower because they are being accessed by other computers