Chap1

Question 1

What is MIS

Answer 1

1Storing and retrieveing data
2 Analysing and visualtization of data
3automating data operations 
4 protecing data
5 Data communcaication and networking

Question 2

what is data communication

Answer 2

movement of computer information from one point to another by means of electrical or optical transmission systems.

Server
Client
circuit

Network without server is called peer to peer network

Question 3

components of LAN

Answer 3

Wireless access point 
switch 
router
client computers
file server

Question 4

What is router

Answer 4

it is a special deivce that connects two or more networks

It enables one computer to connect to other computers on the same network or on the internet.

Question 5

server types

Answer 5

file server = stores data and software
web server = stores documents and graphics
mail server = handles and delivers email over the network

Question 6

Types of network

Answer 6

LAN = commonly operates at 100 million bits per second (100 mbps )
Backbone network = connecting serveral LANs and other networks
(100-1000 mbps)
Wide area networks = connect BNs and MaNs

Question 7

Network Model (OSI model)

Answer 7

1 Physical layer
2 data link layer
3 network layer
4 Transport layer
5 Session layer
6 Presentation layer
7 Application Layer

Question 8

Seven Layers of OSI Model

Answer 8

1 Physical Layer =transmitting data bits (zeros and ones) over a communication circuit
2 Data link layer= it manages the physical transmission circuit in layer 1. tranforms it into a circuit that is free of transmission errors.
3 Network Layer = it performs routing.
4 Transport layer = deals with end to end issues, such as procedures for entering and departing from the network. Maintain logical connections. makes sure that packets are received.
5 session layer = It for managing and structuring all sessions
6 Presentation layer = formast the data for presentation to the user
7 Application layer = it is the end user’s access to the network.

Question 9

Internet Model 
(Layers)

Answer 9

1 Physical layer = physical connection between the sender and receiver
2 data link layer = moving message from one computer to the next computer in the network path from the sender to receiver.
3 Network layer = the network layer performs routing
4 The transport layer = responsible for linking the application layer software to the network and estabilishing end to end connections.
5 Application = application layer is the application software used by the network user.

Question 10

what is hardware layer

Answer 10

Some people group data link layer and physical layer together in the internet model and call them hardware layer.

Question 11

Message transmission using layers

Answer 11

1 each computer in the network has software that operates at each of the layers and performs the functions required by those layers
2 each layer i the network uses a formal language or protocol, that simply a set of rules that define what the layer will do
3 message sent in the network pass through all the layers
4 All layers except physical layer create a new protocol data unit as the messages passes through them.