Networks

Question 1

Define a LAN

Answer 1

Local Area Networks: It covers a small area consisting of computers and peripheral devices connected together, often on a single site. Example School Buildings

Question 2

Define a WAN

Answer 2

Wide Area Network: The internet is the largest Wide Area Network in the world. A WAN is a collection of computers and networks connected together using resources supplied by a “third party carrier” such as British Telecom.

Question 3

What information does a packet contain?

Answer 3

A packet contains:
The IP address it is going to
The IP address it came from
The sequence number of the packet
The number of packets in the whole communicaton
Error checking data

Question 4

What happens to lost packets?

Answer 4

The last router with the packet will discard it,

Question 5

What does DNS stand for and what does it do?

Answer 5

Domain Name System: When you type a domain name into a browser the web page request is to Domain Name System server on the internet. The DNS server has a database of domain names and IP addresses and translate the domain name into an IP address.

Question 6

A Network Interface Card has a unique MAC address True/False

Answer 6

True

Question 7

What is the point of MAC address?

Answer 7

The purpose of the MAC address is to provide a unique hardware address or physical address for local area networks.

Question 8

An advantage and disadvantage of networking your computer.

Answer 8

Advantage:
File Sharing
Sharing software between users

Disadvantages:
Network cabling and file servers can be expensive
Viruses can be spread to other computers
Risk of hackers stealing information

Question 9

Define Router

Answer 9

A device that forwards packets through networks