The Internet

Question 1

What does an ISP do?

Answer 1

Organises access to the internet for small organisations and individuals

Question 2

What is the function of an IP address?

Answer 2

A unique address for each computer so that computers can communicate with each other over the internet

Question 3

What are the three steps to packet switching?

Answer 3

1. Sender’s file is broken into packets.
2. Packets are directed to destination by routers which inspect the packet’s headers.
3. Receiving computer reassembles them in the correct order using information in the headers.

Question 4

Name the components in this URL:

http://example.com/index.html

Answer 4

http: = protocol identifier
example. com = domain name
index. html = file name

Question 5

Why are domain names used?

Answer 5

They are easier to remember and enter than binary numbers

Question 6

What are the 6 steps to accessing the IP of a server using a URL?

Answer 6

1. User enters domain name into browser on client computer
2. Client contacts a DNS server to resolve the domain name
3. If the domain name is not here, it contacts another server
4. Second server resolves domain name, and returns it to the first
5. Server returns the IP address to the client
6. Client contacts the host using the IP address

Question 7

What is virtualisation?

Answer 7

A process that hides the true physical nature of a computing resource