1. Unit 4: Data Communication

2. LESSON OBJECTIVES Identify the parts of a URL
Define the term ‘network’
Identify the type of network used in the computer labs at school
Identify prominent computer network threats after playing threat memory game
Describe each computer network threat
Justify an appropriate security measure for an identified computer network threat after analysing security threats
Use search operators to locate information

3. Parts of a url
Uniform Resource Locator is the address of an Internet file, and is usually in this format, made up of four parts

4. Protocol://Server/Path/Filename
Parts of a url
Protocol://Server/Path/Filename
Protocol – the name of the Internet Protocol. A protocol s the way of doing something. In this case, a set of instructions that allows your computer to access files

5. Protocol://Server/Path/Filename
Parts of a url
Protocol://Server/Path/Filename
Server – (host name): the computer on which the file is located.
Path (directory hierarchy) in which the file name can be found.

6. Protocol://Server/Path/Filename
Parts of a url
Protocol://Server/Path/Filename
Filename: the actual file name of the document

7. Protocol://Server/Path/Filename
Parts of a url
Protocol://Server/Path/Filename
Filename: the actual file name of the document

8. EXAMPLE OF A URL http www.freesitetools.com multimedia/music midi.html
http
Protocol
Server
multimedia/music
Path
midi.html
Filename

9. ACTIVITY 1
Find a webpage of your choice and use it to identify the four parts in the URL.

10. TOP LEVEL DOMAIN
Top level domain is the part of an Internet address that identifies an Internet domain, e.g. edu (education), .com (commercial), or a two-letter country code.

11. TOP LEVEL DOMAIN

12. State the purpose of each of the following domains.
QUESTION
Close
State the purpose of each of the following domains.

13. TYPES OF COMPUTER NETWORK

14. network
A network is defined as a group of two or more computer systems linked together.

15. WIDE AREA NETWORK (WAN)
TYPES OF network
LOCAL AREA NETWORK (LAN)
WIDE AREA NETWORK (WAN)
The computers in a LAN are geographically close together (that is, in the same building)
A WAN (wide area network) is a communications network that spans a large geographic area such as across cities, states, or countries

16. LOCAL AREA NETWORK (LAN)
TYPES OF network
LOCAL AREA NETWORK (LAN)

17. WIDE AREA NETWORK (WAN)
TYPES OF network
WIDE AREA NETWORK (WAN)

18. WIDE AREA NETWORK (WAN)
TYPES OF network
WIDE AREA NETWORK (WAN)
WANS can be private to connect parts of a business or they can be more public to connect smaller networks together.
PRIVATE NETWORKS
An intranet connects employees inside your company
An extranet connects your employees to vendors and/or customers.
INTRANET
EXTRANET

19. TYPES OF network
An Intranet is much like a micro-version of the Internet with a company or organization. Authorized users with a company can use the company’s Intranet to find information easily and quickly.
Intranets use the same browsers and software use the Internet.

20. TYPES OF network
An Intranet is much like a micro-version of the Internet with a company or organization. Authorized users with a company can use the company’s Intranet to find information easily and quickly.
Intranets use the same browsers and software use the Internet.