Advantages and Disadvantages of Computer Networks for Primary 6

Computer Studies Primary 6 Second Term Lesson Notes – Week 6

Subject: Computer Studies
Class: Primary 6
Term: Second Term
Week: 6
Age Group: 10-12 years

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Topic: Computer Networks

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Sub-Topics:

1. Sketching and Describing Network Topology
2. Advantages of Computer Networks
3. Disadvantages of Computer Networks

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Behavioral Objectives

By the end of the lesson, students should be able to:

1. Sketch and describe common types of network topology.
2. Outline the advantages of using computer networks.
3. List the disadvantages of computer networks.

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Keywords:

• Network
• Topology
• Bus
• Star
• Ring
• Advantages
• Disadvantages

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Set Induction

Show a chart or diagram of network topologies (Bus, Star, Ring). Ask the students if they can identify how computers are connected and discuss why these arrangements may be used.

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Entry Behavior

Students should already have knowledge of what computer networks are and the types of network topology from the previous lessons.

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Learning Resources and Materials

• Chart showing network topology diagrams (Bus, Star, Ring)
• Computers or tablets with pre-installed diagrams (if available)
• Whiteboard for sketching

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Building Background/Connection to Prior Knowledge

Remind students of the definition of a computer network and the types of topology discussed in Week 4.

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Embedded Core Skills

• Critical Thinking: Identifying and analyzing advantages and disadvantages.
• Creativity: Sketching and labeling network diagrams.

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Content

1. Sketching and Describing Network Topology

a. Bus Topology:

• Sketch: (Teacher to draw a horizontal line with nodes connected to it.)
• Description: All devices are connected to a single central cable called a bus. Data is transmitted along this main cable.
• Example: Used in small networks in homes or offices.

b. Star Topology:

• Sketch: (Teacher to draw a central hub with multiple devices connected to it in a star shape.)
• Description: All devices are connected to a central hub or switch. Data passes through the hub to communicate with other devices.
• Example: Common in schools and small businesses.

c. Ring Topology:

• Sketch: (Teacher to draw a circle with devices connected to it.)
• Description: Devices are connected in a circular arrangement. Data travels in one direction, passing through each device in the ring.
• Example: Used in small offices.

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2. Advantages of Computer Networks

1. Resource Sharing: Networks allow sharing of files, printers, and other resources.
2. Cost Efficiency: Shared resources reduce the need for individual equipment.
3. Communication: Enables faster communication between users through emails or instant messaging.
4. Centralized Data Management: Data is stored and managed in a central location for easier access.
5. Scalability: Networks can grow by adding more devices without significant changes.
6. Backup and Recovery: Centralized systems make it easier to back up and recover data.

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3. Disadvantages of Computer Networks

1. Security Risks: Data is vulnerable to unauthorized access or hacking.
2. Cost of Setup: Initial setup, including buying hardware and cables, can be expensive.
3. Technical Issues: Networks can experience downtime or technical failures.
4. Spread of Viruses: A virus in one computer can quickly spread to others.
5. Overdependence: If the network fails, users cannot access resources.
6. Maintenance Costs: Regular updates, repairs, and maintenance require additional expenses.

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Evaluation (Fill-in-the-Blank Questions):

1. _______ topology connects devices to a central hub or switch.
   a) Ring
   b) Bus
   c) Star
   Answer: c) Star
2. In _______ topology, all devices are connected to a single central cable.
   a) Ring
   b) Bus
   c) Star
   Answer: b) Bus
3. Devices are connected in a circular arrangement in _______ topology.
   a) Star
   b) Ring
   c) Bus
   Answer: b) Ring
4. One advantage of a computer network is _______ sharing.
   a) Resource
   b) Time
   c) Cost
   Answer: a) Resource
5. A disadvantage of computer networks is the spread of _______.
   a) Data
   b) Viruses
   c) Information
   Answer: b) Viruses
6. _______ management is easier in computer networks.
   a) File
   b) Centralized Data
   c) Resource
   Answer: b) Centralized Data
7. Networks enable faster _______ between users.
   a) Communication
   b) Typing
   c) Processing
   Answer: a) Communication
8. _______ risks are a major concern in computer networks.
   a) Security
   b) File
   c) Data
   Answer: a) Security
9. _______ costs of setting up a network can be high.
   a) Maintenance
   b) Initial
   c) Backup
   Answer: b) Initial
10. A virus in one computer can _______ to other devices on the network.
    a) Repair
    b) Spread
    c) Transfer
    Answer: b) Spread

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Class Activity Discussion

FAQs:

1. What is network topology?
   • Answer: Network topology is the arrangement or layout of devices in a computer network.
2. Name three types of network topology.
   • Answer: Bus, Star, and Ring.
3. What is the main feature of bus topology?
   • Answer: All devices are connected to a single central cable.
4. What happens if the hub fails in a star topology?
   • Answer: The entire network stops working.
5. List two advantages of computer networks.
   • Answer: Resource sharing and faster communication.
6. List two disadvantages of computer networks.
   • Answer: Security risks and maintenance costs.
7. Why is scalability an advantage of networks?
   • Answer: More devices can be added to the network without major changes.
8. What is the disadvantage of overdependence on networks?
   • Answer: If the network fails, users cannot access resources.
9. What is one example of a virus spreading in a network?
   • Answer: A virus in one computer infecting others connected to the network.
10. What is centralized data management in networks?
    • Answer: Data is stored in a central location for easier access and management.

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Teacher’s Activity:

• Draw diagrams of Bus, Star, and Ring topologies on the board.
• Explain their features, advantages, and disadvantages.

Learner’s Activity:

• Draw and label the topologies in their notebooks.
• Discuss in groups the advantages and disadvantages of networks.

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Assessment (Short-Answer Questions):

1. Sketch and describe a star topology.
2. List three advantages of computer networks.
3. Explain the main disadvantage of a bus topology.
4. What is centralized data management?
5. State one disadvantage of network dependence.

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Conclusion

The teacher will summarize the key points discussed and provide feedback on students’ understanding of network topology, advantages, and disadvantages.

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