UNIT 4 DATA COMMUNICATION LESSON OBJECTIVES 1 Identify

UNIT 4: DATA COMMUNICATION

LESSON OBJECTIVES 1. Identify the parts of a URL 2. Define the term ‘network’ 3. Identify the type of network used in the computer labs at school 4. Identify prominent computer network threats after playing threat memory game 5. Describe each computer network threat 6. Justify an appropriate security measure for an identified computer network threat after analysing security threats 7. Use search operators to locate information

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

PARTS OF A URL Protocol: //Server/Path/Filen ame 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

PARTS OF A URL Protocol: //Server/Path/Filen ame Server – (host name): the computer on which the file is located. Path (directory hierarchy) in which the file name can be found.

PARTS OF A URL Protocol: //Server/Path/Filen ame Filename: the actual file name of the document

EXAMPLE OF A URL http: //www. freesitetools. com/multimedia/music/ midi. html Protoc ol Server Path Filenam e http www. freesitetools. com multimedia/music midi. html

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

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 twoletter country code.

TOP LEVEL DOMAIN

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

TYPES OF COMPUTER NETWORK

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

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

TYPES OF NETWORK LOCAL AREA NETWORK (LAN)

TYPES OF NETWORK 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. An intranet connects employees inside your company PRIVATE NETWORKS INTRANET An extranet connects your employees to vendors and/or customers. EXTRANET

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.