Networking

Question 1

What is lan

Answer 1

Lan stands for local area network and is defined as a collection of computers and peripherals such as printers, all connected together in a single site, such as the computers and printers connected at school. Don’t have to be same building

Question 2

What is wan

Answer 2

Wan means wide area network. It is a type of infrastructure used to connect different lans together. E.g. If a school is separated in half by a motorway, the two lan sites will be connected by wan, using the network providers wires. Lan uses its own network cables, not someone else’s

Question 3

How do recourses benefit from networks

Answer 3

Files and folders can be shared between computers easily and can be accessed anywhere on the network
Printers and other peripheral devices can be shared and accessed anywhere on the network
Internet connection can be shared

Question 4

How does communication benefit from networking

Answer 4

Email can be used, without networks, email won’t work
Messaging systems can be set up
Quick to transfer files remotely

Question 5

How does management benefit from network

Answer 5

User profiles and security can be managed centrally
Software can be easily distributed and used over the network, rather than having to individually install it on each computer
Users can use any pc on the network while keeping there own files
Centralised backup of all files

Question 6

What are topologies

Answer 6

Different types of network layouts

Question 7

What is the bus network

Answer 7

This is a topology only used in lan. It connects all the computers to a single back bone network cable. This does mean only one computer can transmit at a time.

Question 8

Advantages and disadvantages of using bus network

Answer 8

It’s easy and inexpensive to install, not much expensive cable
Easy to add new computers
Quicker than ring as info doesn’t have to go through different computers

If main cable fails, whole network goes down
Cable failures hard to isolate as all computers are connected to it
All data is broadcast onto one cable so not very secure
Can become slow if network is busy, data collisions

Question 9

What is a ring network

Answer 9

A topology where each computer is attached to the two adjacent ones. They take turn transmitting by passing a token around the network, they can only transmit when they have the token. The network forms a ring

Question 10

Advantages and disadvantages of using ring network

Answer 10

Not dependant on a single computer like star network
Token passing protocol is simple therefore reliable
Consistant performance no matter how busy

A single node or link failure can disrupt the whole system
All connections shared so not secure
Data has to go round whole network though many computers so very slow

Question 11

What is a star network

Answer 11

Used in lans and wans, each computer has its own network cable connecting it to the main central switch/server. This is where all the recourses such as foldr files are stored. The central server controls the network

Question 12

Advantages and disadvantages of using the star network

Answer 12

If a cable fails, the system still works, only that computer is affected
Consistant performance even when very busy
Easy to add new computers
More secure as transfers aren’t accessible everywhere

Expensive to install as lots of cable needed
If central server or computer goes down, so does the rest of the system

Question 13

What is a client server network

Answer 13

A network managed by a main powerful server. The client computers communicate with other clients through the server
There may be different servers on the network such as for email, printers and the website

Question 14

What kind of network does server client network used

Answer 14

Uses a wan architecture which is why website and foldr can be accessed around the world

Question 15

What does a client server network work

Answer 15

Client requests something, the server retrieves it and sends it to the clien

Question 16

Summarise stand alone applications

Answer 16

All data is stored locally, on main disc
No network connection needed
Single user
Used when needed, can be closed
Modular structure, less important
Local access rights are sufficient security for stand alone

Question 17

Summer rise client server applications

Answer 17

Data must be passed between client and server
Network needed
Multiple clients using one server so must be a managed queue
Must be available all the time
Clients should be authenticated before data is sent to them for security

Question 18

What is the handshake process in networks

Answer 18

It’s where the client and server begin there talk before they start properly. Such as when you begin your talk with a friend, you say hi tom, and wait for there response before you carry on.

Question 19

What happens in the handshake proces

Answer 19

The computer insisting the conversation sends a synchronisation request, SYN, to the other computer, server.
The server responds to the clients request by sending its on SYN back, to tell the other computer it’s acknowledge it’s been received
The client acknowledges this response which completes the start up sequence