Lesson Notes By Weeks and Term - Senior Secondary 3

Term: 1^st Term

Week: 1

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 2 periods each

Date:

Subject:      Computer Studies and ICT

Topic:-       Network

SPECIFIC OBJECTIVES: At the end of the lesson, pupils should be able to

1. Define networks and computer networking
2. Discuss the types of networks according to scale

INSTRUCTIONAL TECHNIQUES: Identification, explanation, questions and answers, demonstration, videos from source

INSTRUCTIONAL MATERIALS: Videos, loud speaker, pictures, Data Processing for senior Secondary Education by Hiit Plc, WAPB Computer Studies for Senior Secondary III by Adekunle et al, On-line Materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

NOTE

NETWORKING AND NETWORK TOPOLOGY

A computer network consists of a collection of computers, printers and other equipment that are connected together so that they can communicate with each other. It is also defined as a group of two or more computer systems linked together.

Computer Networking is the scientific and engineering discipline concerned with communication between computer systems.

Types of Network

Network can be grouped into three categories, namely;

1. By Scale
2. Topology
3. Functional Relationship

Types of Network According to Scale

Depending upon the geographical area covered by a network, it is classified as:

1. Personal Area Network (PAN):PAN is a computer network organized around an individual person (typically within 10 meters). PAN may be wired with computer such as USB and Fire wire. A wireless Personal Area Network (WPAN) can be made possible with network technology such as infrared Data Association (irDA) and Bluetooth.

2. Local Area Network (LAN):A local area network is a computer network covering a small local area, like a home, office, or school. LAN has the following elements:

1. Server: It is the main computer that acts as a host and provides data, software, etc. to the other terminal linked with it.
2. Work station: These are the computers attached to the server on the LAN
3. Network Interface Unit: is a device that serves as a common interface for various other devices within a local area network (LAN)
4. Communication Channel: It is the medium through which the packets travel. The packets generally travel through cables which are of three types: Twisted pair cables, Co-axial cables and Fiber optic cables
5. LAN Software:

The software components of a LAN can be grouped into two categories:

• Inside PCs/workstations and servers
• NIC Drivers
• Network Operating System for servers, for example, Novell® Netware 4.1 or Microsoft Windows® NT
• Network Operating System for clients (PCs/workstations), for example, Novell® Netware 4.1 client or Microsoft Windows® 95
• Networking protocol software, for example, TCP/IP, Novell® IPX
• Application software, for example, emails, Internet Web Browser

3. Metropolitan Area Network (MAN):MANs are large computer network usually spanning a large campus.

4. Wide Area Network (WAN):WAN is a computer network covering a broad geographical area.

5. Internet. The internet is a worldwide network of computers that share information.

EVALUATION:    1. Define “Networks” and “Computer networking”

2. Discuss the types of networks according to scale

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively