# Lesson Notes By Weeks and Term - Senior Secondary 3

Networking III

Term: 2nd Term

Week: 8

Class: Senior Secondary School 3

Age: 17 years

Duration: 40 minutes of 2 periods each

Date:

Subject:      Data Processing

Topic:-       Networking III

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

1. List and explain each type of network topology

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 I by Adekunle et al, On-line Materials.

INSTRUCTIONAL PROCEDURES

PERIOD 1-2

 PRESENTATION TEACHER’S ACTIVITY STUDENT’S ACTIVITY STEP 1 INTRODUCTION The teacher reviews the previous lesson on the types of networks Students pay attention STEP 2 EXPLANATION He lists the various types of network topology Students pay attention and participates STEP 3 DEMONSTRATION He then explains each type of network topology Students pay attention and participate STEP 4 NOTE TAKING The teacher writes a summarized note on the board The students copy the note in their books

NOTE

TYPES OF NETWORK TOPOLOGY

Network Topology

A network topology is the pattern in which nodes(i.e., computers, printers, routers or other devices) are connected to a local area network(LAN) or other network via links (e.g., twisted pair copper wire cable or optical fiber cable).

There are four principal topologies used in LANs: bus, ring, star and mesh.

1. Bus: The most widely used of these is bus, because it is employed by Ethernet, which is the dominant LAN architecture. In a bus topology all devices are connected to a central cable, called the  bus or backbone. This topology is relatively inexpensive and easy to install for small networks.
2. Ring: In a ring topology each device is connected directly to two other devices, one on either side of it, to form a closed loop. This topology is relatively expensive and difficult to install, but it offers high bandwidth and can span large distances. A variation is the token ring, in which signals travel in only one direction around the loop, carried by a so-called token from node to node.
3. Star: In a star topology all devices are connected directly to a central computer or server. Such networks are relatively easy to install and manage, but bottlenecks can occur because all data must pass through the central device.

1. Mesh: The mesh topology can be either a full mesh or a partial mesh. In the former, each computer is connected directly to each of the others. In the latter, some computers are connected to most of the others, and some are connected only to those other nodes with which they exchange the most data.

The several basic network topologies can be combined in various ways to form hybrid topologies, such as a ring-star network or a tree network. The latter consists of two or more star networks connected to a linear bus.

EVALUATION:    1. List and explain all the types of network topology

CLASSWORK: As in evaluation

CONCLUSION: The teacher commends the students positively