21 Jun 2026
20 Jun 2026
Restore, maintain face and 8K
Restore this old photo while keeping it realistic and true to the original. Reduce noise and film grain, fix blur, improve sharpness and micro-detail (eyes, hair, fabric), correct faded colors, balance exposure and contrast, remove minor scratches/dust/stains, and recover detail in shadows and highlights. Keep the same composition, faces, identity, and natural skin texture—do not change facial features or add/remove objects. Output 8K
Key Terms
| Term | Meaning |
|---|---|
| Cash audit | Audit procedures performed to verify cash balance |
| Bank reconciliation | Comparison between bank statement and cash book |
| Deposits in transit | Cash received and recorded but not yet shown in bank statement |
| Outstanding cheque | Cheque issued but not yet cleared by the bank |
| Skimming | Stealing cash before recording it |
| Lapping | Hiding stolen cash by delaying customer payment records |
| Kiting | Overstating cash by manipulating transfers between bank accounts |
| Proof of cash | Audit schedule used to check cash receipts and payments |
| Cutoff | Ensuring transactions are recorded in the correct accounting period |
| Petty cash | Small cash fund for minor expenses |
Audit of Imprest Petty Cash
Petty cash is usually small, but auditors may still check it because it can be misused.
Important controls over petty cash include:
- One person should be responsible for the petty cash fund.
- Petty cash should be kept separately from other cash.
- There should be a maximum limit for each petty cash payment.
- The total petty cash fund should be fixed.
- Only approved types of expenses can be paid using petty cash.
- Every petty cash payment should have a pre-numbered petty cash voucher.
- The voucher should be approved by a responsible officer.
- Actual cash plus unreimbursed petty cash vouchers should equal the petty cash fund amount in the general ledger.
Example:
Petty cash fund = RM500
Actual cash in box = RM120
Petty cash vouchers = RM380
Total = RM500
This means the petty cash fund balances correctly.
Test of Interbank Transfers
This test is used to detect kiting.
The auditor checks whether the recording dates for cash disbursement and cash receipt are in the same financial year.
Important rule:
The disbursement and receipt of the same transfer must be recorded in the same fiscal year.
If the receipt is recorded before year-end but the disbursement is recorded after year-end, it may indicate kiting.
Example of Kiting
Assume the company transfers RM10,000 from Account A to Account B.
Before year-end:
- Account B records RM10,000 as received.
- Account A has not yet recorded the deduction.
At 31 December, the accounts show:
| Account | Balance Effect |
|---|---|
| Account A | RM10,000 still shown |
| Account B | RM10,000 added |
| Total shown | RM20,000 |
| Actual cash | RM10,000 |
This means the company appears to have more cash than it actually has.
Proof of Cash
Proof of cash is used when there are material internal control weaknesses in cash.
It helps the auditor determine whether:
- All recorded cash receipts were deposited.
- All bank deposits were recorded.
- All recorded cash payments were paid by the bank.
- All payments made by the bank were recorded.
Extended Test of Bank Reconciliation
This is performed when the auditor believes the year-end bank reconciliation may be intentionally misstated.
The auditor checks whether transactions before and after year-end are correctly included or excluded.
Test of Bank Reconciliation
The auditor checks whether the bank reconciliation is properly prepared.
The auditor examines:
- Bank balance
- Cash book balance
- Deposits in transit
- Outstanding cheques
- Bank charges
- Errors
- Other reconciling items
Cutoff Bank Statement
A cutoff bank statement is a short-period bank statement after year-end, usually covering 7 to 10 days after the reporting date.
The auditor uses it to check whether year-end reconciling items are genuine.
Example:
If the year-end date is 31 December 2023, the auditor may request a bank statement from 1 January to 10 January 2024.
Bank Confirmation
The auditor sends a confirmation request directly to the bank. The bank confirms the client’s cash balance, loan balance, or other financial information.
If the bank does not reply, the auditor should send a second request or ask the client to contact the bank.
Audit of the General Cash Account
The general cash account has high audit risk because cash is easy to steal or manipulate.
Important controls over the general cash account include:
- Proper segregation of duties between cheque signing and accounts payable.
- Cheques should be signed only by authorised persons.
- Use of pre-numbered cheques.
- Supporting documents must be reviewed before cheques are signed.
- Bank reconciliation should be prepared monthly by an independent person.
The purpose of bank reconciliation is to ensure that the accounting records agree with the actual cash balance in the bank after considering reconciling items.
Common Substantive Tests for Cash
| Substantive Test | Main Audit Objective |
|---|---|
| Obtain analysis of cash balances and reconcile to general ledger | Accuracy |
| Send bank confirmation to banks | Existence and rights |
| Obtain bank reconciliation | Existence and accuracy |
| Obtain bank cutoff statement | Cut-off and completeness |
| Count cash on hand | Existence |
| Verify cash transaction cut-off | Existence, rights, and completeness |
| Analyse bank transfers around year-end | Detect kiting |
| Investigate payments to related parties | Fraud risk and disclosure |
| Evaluate presentation and disclosure | Proper reporting |
Designing Substantive Tests of Cash
Substantive tests are audit procedures used to obtain evidence about the correctness of cash balances.
Management has two main concerns about cash:
- To protect cash from unauthorised use.
- To maintain enough cash, but not excessive cash.
Although bank reconciliation can detect many errors, cash is still risky because of its liquid nature.
Internal Controls Over Cash - Physical Controls
Cash and cheques should be kept securely.
Examples of physical controls:
- Keep cash in a locked safe.
- Limit access to authorised staff only.
- Use passwords for accounting systems.
- Use two-factor authentication for online banking.
- Keep cheque books in a secure place.
Internal Controls Over Cash - Bank Reconciliation
The company should compare the bank statement with the cash book regularly.
Bank reconciliation helps detect:
- Unrecorded bank charges
- Outstanding cheques
- Deposits in transit
- Errors by the bank
- Errors by the company
Internal Controls Over Cash - Segregation of Duties
Different people should handle different cash-related tasks.
For example:
| Duty | Person Responsible |
|---|---|
| Receiving cash | Cashier |
| Recording cash | Accounts clerk |
| Bank reconciliation | Independent staff |
| Approving payment | Manager |
This reduces the chance of fraud because one person does not control the whole process.
Internal Controls Over Cash - Authorization of Transactions
All cash payments and receipts should be approved by authorised personnel.
Example:
Only the finance manager can approve cheque payments above RM5,000.
Fraud Risks in Cash - Kiting
Kiting happens when money is transferred between bank accounts to overstate the cash balance.
Simple explanation:
The same cash appears to exist in two bank accounts at the same time.
Example:
Before year-end, RM10,000 is recorded as received in Bank B, but it has not yet been deducted from Bank A. The company appears to have RM20,000, but the real cash is only RM10,000.
Fraud Risks in Cash - Fictitious Disbursement
This happens when fake expenses are recorded to hide cash theft.
Example:
An employee creates a fake supplier invoice and issues payment to their own bank account.
Fraud Risks in Cash - Lapping
Lapping is hiding cash theft by delaying the recording of customer payments.
Example:
Cash received from Customer A is stolen. Later, cash received from Customer B is used to cover Customer A’s account.
Fraud Risks in Cash - Skimming
Skimming is stealing cash before it is recorded in the accounting records.
Example:
A cashier receives RM500 from a customer but does not issue a receipt and keeps the money.
Risk of Material Misstatement - Window Dressing
A material misstatement means an error or fraud that is serious enough to affect the financial statements.
Possible misstatements in cash include:
2. Window Dressing
Window dressing happens when management tries to make the company look financially stronger than it actually is.
Example:
A director repays a loan to the company just before year-end, so the cash balance looks higher. Then, after year-end, the director borrows the money again.
Risk of Material Misstatement - Timing Error
A material misstatement means an error or fraud that is serious enough to affect the financial statements.
Possible misstatements in cash include:
1. Timing Error
A cash receipt or payment is recorded in the wrong accounting period.
Example:
Cash received on 2 January 2024 is wrongly recorded as received on 31 December 2023.
Risks Related to Cash - Inherent Risk
Inherent risk means the risk that an error or fraud may happen because of the nature of the business or transaction.
Cash has high inherent risk because it is easy to steal and easy to manipulate.
Inherent risk is higher when there is:
| Situation | Explanation |
|---|---|
| High judgment | Staff may make wrong decisions when recording transactions |
| Estimates | Some cash-related amounts may require estimates |
| Complexity | Large businesses with many branches or subsidiaries may record cash incorrectly |
Auditor’s Objectives When Auditing Cash - Presentation and Disclosure
The auditor checks whether cash is properly presented in the financial statements.
Example:
Restricted cash, compensating balances, or sinking funds should be properly disclosed.
Auditor’s Objectives When Auditing Cash - Accuracy
The auditor checks whether the cash balance is recorded at the correct amount.
Example:
The bank statement shows RM50,000, but the general ledger shows RM55,000. The auditor must investigate the difference.
Auditor’s Objectives When Auditing Cash - Rights
The auditor checks whether the company has legal rights to the cash.
Example:
Cash in the company’s bank account belongs to the company, but restricted cash may not be freely used.
Auditor’s Objectives When Auditing Cash - Completeness
The auditor checks whether all cash transactions have been recorded.
Example:
If the company received RM8,000 from a customer, the auditor checks whether it was recorded in the cash book and general ledger.
Auditor’s Objectives When Auditing Cash - Existence
The auditor checks whether the recorded cash actually exists.
Example:
If the company records RM100,000 cash in bank, the auditor checks whether the bank confirms that the money exists.
Why Cash Is Important in Audit
Cash is important because:
- It is involved in almost all business cycles.
- It is highly liquid and easy to misuse.
- It is more exposed to theft than many other assets.
- A wrong cash balance can affect users’ understanding of the company’s financial position.
- Management may manipulate cash balances to make the business look stronger.
Cash Equivalents
Cash equivalents are short-term, highly liquid investments that can be easily converted into cash.
Examples:
- Time deposits
- Certificates of deposit
- Money market funds
They usually have low risk and short maturity periods.
Imprest Petty Cash Fund
Petty cash is not a bank account. It is a small amount of cash kept for minor expenses.
Examples of petty cash payments:
- Parking fees
- Photocopy charges
- Small stationery purchases
- Courier fees
The petty cash fund should have a fixed amount, and all spending must be supported by receipts or petty cash vouchers.
Branch Bank Account
A branch bank account is used by branch offices. It helps the branch manage local cash transactions while still allowing the company to centralise control.
Example:
A company with branches in Kuantan, Temerloh, and Shah Alam may allow each branch to maintain its own bank account.
Imprest Account
An imprest account is a fixed-balance cash account. The company maintains a certain amount of money in the account and replenishes it when needed.
One example is an imprest payroll account, which is used to control salary payments.
General Cash Account
The general cash account is the main cash account of the business. Most cash receipts and cash payments pass through this account. It is the focal point of cash transactions.
Example:
Customer pays RM5,000 into the company bank account. The payment is recorded in the general cash account.
Introduction to Cash Audit
Cash is one of the most important accounts in an audit because almost every business transaction affects cash. Money comes into the business through sales, loans, disposal of assets, or capital introduced by owners. Money goes out through purchases, payroll, payment of liabilities, and buying assets.
Cash is considered high risk because it is easy to steal, misuse, or manipulate. Unlike inventory or equipment, cash does not need to be converted into another form before it can be used. Therefore, auditors must pay close attention to cash balances and cash transactions.
In auditing cash, the auditor must check two important things:
- Whether the bank reconciliation is correct.
- Whether the cash recorded in the general ledger reflects all actual cash transactions during the year.
19 Jun 2026
Audit of Cash Balances
- Introduction to Cash Audit
- Types of Cash Accounts
- Why Cash Is Important in Audit
- Auditor’s Objectives When Auditing Cash
- Risks Related to Cash
- Inherent Risk
- Risk of Material Misstatement
- Fraud Risks in Cash
- Internal Controls (IC) Over Cash
- Designing Substantive Tests of Cash
- Common Substantive Tests for Cash
- Audit of the General Cash Account
- Important Audit Procedures for General Cash Account
- Fraud-Oriented Procedures - when the auditor suspects fraud/weak IC
- Audit of Imprest Petty Cash
- Key Terms
18 Jun 2026
17 Jun 2026
15 Jun 2026
Summary
Keywords
- Cybercrime
- Malware
- Social Engineering
- Firewall
- VPN
- Backup
- Authentication
- Biometrics
- 2FA
- Encryption
- Privacy
- Green Computing
- Disaster Recovery
- Digital Inclusion
Digital Inclusion
Digital inclusion ensures everyone has access to digital technologies regardless of background.
Goals
- Access to education
- Employment opportunities
- Government services
- Healthcare information
Barriers
| Barrier | Example |
|---|---|
| Geographic limitations | Rural areas without Internet |
| Cost | Expensive devices |
| Government restrictions | Limited access |
| Lack of education | Low digital literacy |
Disaster Recovery Planning
A disaster recovery plan helps organisations restore operations after disruptions.
Components
Emergency Plan
Immediate response procedures.
Backup Plan
Protects important data.
Recovery Plan
Restores systems.
Test Plan
Ensures plans work effectively.
Organisational Policies for Safety
Organisations implement policies to ensure safe technology use.
Code of Conduct
Guidelines on acceptable technology behaviour.
Examples:
- No cyberbullying.
- No illegal downloads.
- Respect intellectual property.
Content Filtering
Restricts access to inappropriate websites.
Examples:
- Gambling sites
- Adult content
- Harmful websites
Employee Monitoring
Employers may monitor:
- Email usage
- Internet browsing
- Productivity
Protecting Personal Information
Students should:
✓ Think before posting online.
✓ Review privacy settings.
✓ Avoid sharing sensitive details.
✓ Use strong passwords.
✓ Monitor financial transactions.
✓ Report suspicious activities.
Information Privacy
Information privacy refers to controlling how personal information is collected and used.
Authentication
Verifying that users are genuine.
Methods
a) Password
Secret characters known only to users.
b) Biometrics
Uses unique body characteristics.
Examples:
- Fingerprint
- Face recognition
- Iris scan
- Voice recognition
c) Two-Factor Authentication (2FA)
Combines two methods.
Example:
Password + SMS code.
Benefit
Provides stronger security.
d) CAPTCHA
Distinguishes humans from automated programs.
Example:
Typing distorted letters shown on screen.
e) Encryption
Converts readable information into coded information.
Only authorized users can decrypt it.
Wireless Security
Risks of Public Wi-Fi
Public Wi-Fi may expose users to:
- Data theft
- Malware attacks
- Unauthorized monitoring
Safety Tips
✓ Use trusted networks
✓ Avoid online banking on public Wi-Fi
✓ Use strong Wi-Fi passwords
✓ Enable encryption
✓ Update router settings
✓ Secure router location
Access Controls and Backup
Access Control
Limits who can access information.
Examples:
- User accounts
- Passwords
- Permissions
Audit Trail
Records activities performed in a system.
Examples:
- Login attempts
- Data modifications
Purpose:
- Monitoring
- Investigation
Backup
Copies of important data.
Types of Backup
| Backup Type | Meaning |
|---|---|
| Full Backup | Copies everything |
| Differential Backup | Copies changes since full backup |
| Incremental Backup | Copies changes since last backup |
| Selective Backup | User chooses files |
| Continuous Backup | Real-time backup |
Secure IT: Protect Yourself and Your Data
Digital Footprint
A record of everything you do online.
Examples:
- Social media posts
- Comments
- Online purchases
- Search history
Important
Digital footprints are difficult to erase permanently.
Virtual Private Network (VPN)
A VPN creates a secure connection over public networks.
Benefits
- Protects transmitted data
- Enhances privacy
- Allows secure remote access
Firewall
A security system that filters incoming and outgoing network traffic.
Purpose
- Blocks unauthorized access
- Protects sensitive information
Protecting Against Malware
Good security practices include:
✓ Install antivirus software
✓ Use firewalls
✓ Avoid suspicious emails
✓ Download software carefully
✓ Scan USB drives
✓ Backup data regularly
✓ Keep software updated
Internet and Network Attacks
Malware
Malware means malicious software designed to harm computers.
Types of Malware
| Malware | Description |
|---|---|
| Adware | Displays advertisements |
| Ransomware | Locks files and demands payment |
| Rootkit | Hides malicious activities |
| Spyware | Secretly collects information |
| Trojan Horse | Disguised as legitimate software |
| Virus | Replicates and damages systems |
Botnet
A group of infected computers controlled remotely.
These computers are called:
Zombie computers
Used to attack other systems.
Denial-of-Service (DoS)
Overloads a server so legitimate users cannot access services.
Distributed DoS (DDoS)
Many infected devices attack simultaneously.
Spoofing
Pretending to be someone else.
Examples
- Fake email addresses
- Fake IP addresses
Ethics and Society
Ethics
Ethics are standards that determine whether actions are right or wrong.
Technology ethics guide responsible use of:
- Computers
- Smartphones
- Information systems
Information Accuracy
Information should be:
- Correct
- Reliable
- Complete
- Up-to-date
Example
Editing photos to spread false information is unethical.
Intellectual Property Rights
Rights protecting creators' work.
Examples:
- Books
- Music
- Movies
- Software
Copyright Infringement
Using others' work without permission.
Example:
Downloading pirated movies.
Green Computing
Using technology in environmentally friendly ways.
Practices
✓ Turn off unused devices
✓ Use energy-saving equipment
✓ Reduce printing
✓ Recycle electronic waste
✓ Use online meetings
Social Engineering
Social engineering tricks people into revealing confidential information.
Common Techniques
| Technique | Meaning |
|---|---|
| Authority | Pretending to be a boss |
| Threat | Using fear |
| Scarcity | Limited-time offers |
| Urgency | Immediate action needed |
| Familiarity | Acting as someone you know |
| Trust | Building confidence |
Example
"Your bank account will be blocked unless you click this link immediately."
Cybercrime and Cybercriminals
Cybercrime
Cybercrime refers to illegal activities carried out using computers or the Internet.
Examples
- Identity theft
- Online scams
- Credit card fraud
- Hacking
- Phishing
Types of Cybercriminals
a) Hacker
Someone who gains unauthorized access to a computer system.
b) Cracker
A hacker with malicious intentions such as:
- Stealing information
- Destroying data
c) Script Kiddie
An inexperienced person using ready-made hacking tools.
d) Hacktivist
An attacker motivated by political or social beliefs.
e) Cyberterrorist
Uses technology to create fear and disrupt society.
Risks Associated with Technology Use
What is Risk?
A risk is the possibility that something harmful may happen, causing injury, loss, or damage.
Digital Security Risk
A digital security risk is any event that may cause damage to:
- Computer hardware
- Software
- Data
- Information
- Processing capability
Examples
| Situation | Risk |
|---|---|
| Clicking suspicious links | Malware infection |
| Sharing passwords | Account hacking |
| Using weak passwords | Unauthorized access |
| Downloading unknown software | Virus attack |
Learning Outcomes
At the end of this topic, students should be able to:
- Explain risks associated with technology use.
- Identify cybercrimes and cybercriminals.
- Discuss ethics and privacy issues.
- Describe Internet and network attacks.
- Explain methods to protect digital information.
- Identify wireless security practices.
- Understand authentication methods.
- Explain organisational policies for digital safety.
Key Terms
| Term | Simple Meaning |
|---|---|
| Network | A group of connected devices |
| Node | A device connected to a network |
| LAN | A network within a limited area |
| WAN | A network covering a large geographic area |
| PAN | A network around an individual |
| Topology | The arrangement of devices in a network |
| Server | A computer that provides resources |
| Client | A device that requests resources |
| Router | A device that connects networks |
| Switch | A device that sends data to the intended recipient |
| Modem | A device that connects a network to an ISP |
| Protocol | Rules for communication |
| TCP/IP | Protocol family used for Internet communication |
| Wi-Fi | Wireless network technology |
| Bluetooth | Short-distance wireless communication technology |
| RFID | Technology used for identification and tracking |
| NFC | Very short-range communication technology |
| VPN | A secure connection to a private network |
| Firewall | A security barrier that controls network traffic |
| Encryption | Converting readable data into coded form |
| Authentication | Verifying a user’s identity |
Ethical Responsibilities of a Network Professional
A network administrator may have access to confidential information. Therefore, the administrator must behave professionally and ethically.
Important Ethical Principles
| Principle | Explanation |
|---|---|
| Professionalism | Perform duties carefully and responsibly |
| Personal integrity | Act honestly and avoid misuse of access privileges |
| Compliance with laws and policies | Follow organisational rules and legal requirements |
| Communication | Explain issues clearly to users and management |
| System integrity | Protect systems from damage or unauthorised changes |
| Social responsibility | Consider the impact of technical decisions on others |
| Privacy | Protect users’ personal and confidential information |
Role of a Network Administrator
A network administrator is responsible for ensuring that a network functions effectively and securely.
Main Responsibilities
| Responsibility | Example |
|---|---|
| Planning | Identifying the network requirements of an organisation |
| Designing | Selecting an appropriate network structure |
| Purchasing | Obtaining routers, switches, servers and cables |
| Installing | Setting up devices and software |
| Securing | Applying passwords, firewalls and encryption |
| Maintaining | Updating equipment and solving technical problems |
| Monitoring | Checking network performance and unusual activity |
| Supporting users | Assisting employees who experience connection problems |
Detecting Unauthorised Wi-Fi Users
To determine whether an unknown person is using a wireless network:
- Sign in to the router’s administrative interface.
- View the list of connected devices.
- Compare the list with known devices.
- Remove unfamiliar devices.
- Change the Wi-Fi password.
- Ensure that encryption and firewall settings are activated.
- Update the router software.
Network Security Tools
29.1 Encryption
Encryption changes readable data into coded data.
Only authorised users with the correct key can read the information.
Example
When a student uses a secure website to submit an assignment, encryption helps protect the data during transmission.
29.2 Authentication
Authentication verifies the identity of a user.
Examples:
- Username and password
- One-time password
- Fingerprint scan
- Facial recognition
- Security token
29.3 Firewall
A firewall monitors and controls network traffic.
It acts like a security checkpoint between a private network and the Internet.
29.4 Biometric Devices
Biometric devices identify users based on physical characteristics.
Examples:
- Fingerprint scanner
- Facial recognition system
- Iris scanner
29.5 Network-Attached Storage
Network-Attached Storage (NAS) is a storage device connected to a network.
It allows authorised users to store and retrieve files centrally.
Benefits
- Centralised storage
- Easier file sharing
- Easier backup management
- Controlled access
29.6 Network Monitoring Software
Network monitoring software observes the status and performance of a network.
It may help administrators:
- Monitor traffic volume
- Identify unusual activity
- Detect network failures
- Measure bandwidth usage
- Identify overloaded devices
29.7 Packet Sniffer
A packet sniffer monitors and records network traffic for analysis.
It may be used ethically by authorised administrators for troubleshooting and security monitoring.
Common Network Risks
| Risk | Explanation |
|---|---|
| Adware | Displays unwanted advertisements |
| Spyware | Collects and transmits information without the user’s knowledge |
| Virus | Damages files or changes system settings |
| Worm | Spreads through computers or networks without requiring much user interaction |
| Trojan | Appears legitimate but contains harmful code |
| Ransomware | Locks files or systems and demands payment |
| Rootkit | Allows hidden administrator-level access to a device |
Key Difference: Virus Versus Worm
| Virus | Worm |
|---|---|
| Usually attaches itself to a file or program | Can spread automatically through a network |
| Often requires user action | May spread without direct user action |
Basic Security Measures
| Security Measure | Purpose |
|---|---|
| Change the default router password | Prevents unauthorised access to router settings |
| Use a strong Wi-Fi password | Reduces the risk of unauthorised users joining the network |
| Enable encryption | Protects data transmitted over the network |
| Update router software | Fixes known security weaknesses |
| Activate the firewall | Blocks suspicious access attempts |
| Check connected devices | Helps detect unknown users |
| Use authentication controls | Ensures that only authorised users gain access |
| Back up important data | Reduces the impact of data loss |
Why Is Network Security Important?
A network may contain valuable and sensitive information, such as:
- Personal details
- Passwords
- Financial records
- Customer information
- Academic documents
- Business plans
Wireless networks are particularly vulnerable because signals may be accessible from outside the building.
Improving a Weak Wi-Fi Signal
If the signal is weak:
- Place the router in a central location.
- Avoid placing the router behind large furniture or thick walls.
- Extend the router antenna fully, when applicable.
- Use a Wi-Fi booster, repeater or mesh system.
- Replace outdated network hardware when necessary.
- Reduce unnecessary interference from nearby devices.
Adding a Wireless Printer
A wireless printer can be shared by several computers and mobile devices.
Steps
- Place the printer within range of the Wi-Fi network.
- Switch on the printer.
- Open the printer’s network settings.
- Select the correct Wi-Fi network.
- Enter the network password.
- Install the required printer application or driver.
- Send a test document.
Basic Steps to Set Up a Wireless Network
Step 1: Connect the Hardware
- Connect the modem to the Internet service.
- Connect the router to the modem.
- Switch on the devices.
Step 2: Configure the Wireless Network
- Enable the wireless function.
- Create a network name, also known as the SSID.
- Create a strong Wi-Fi password.
- Activate encryption.
Step 3: Connect the Devices
- Enable Wi-Fi on the laptop or smartphone.
- Search for the network name.
- Select the correct SSID.
- Enter the Wi-Fi password.
- Test the connection.
Basic Equipment Required
A wireless home network normally requires:
- A modem
- A router or wireless router
- A wireless access point, when needed
- Devices to be connected
- An Internet service subscription
The home-network setup diagram in the uploaded module illustrates how a modem, router, wireless access point and end-user devices work together.
Common Hardware Devices
21.1 Node
A node is any device connected to a network.
Examples:
- Laptop
- Smartphone
- Printer
- Server
- Tablet
21.2 Hub
A hub is a central connection point for devices in a network.
When a hub receives data, it transfers the data to all connected devices.
Key Limitation
A hub is less efficient because every device receives the transmitted data, even when the data is intended for only one device.
21.3 Switch
A switch connects devices within a network and sends data only to the intended recipient.
| Hub | Switch |
|---|---|
| Sends data to all connected devices | Sends data to the intended device |
| Less efficient | More efficient |
| Older and less secure approach | More commonly used in modern networks |
21.4 Router
A router connects two or more networks and directs data to the correct destination.
For example, a home router connects a local home network to the Internet.
Analogy
A router works like a traffic controller. It determines the correct route for each data packet.
21.5 Modem
A modem connects a computer or network to a communications channel, such as an Internet service.
A modem may connect a home or business network to an Internet Service Provider (ISP).
Common Types of Modems
| Type | Description |
|---|---|
| Cable modem | Uses a cable television connection |
| DSL modem | Uses existing telephone wiring |
| Fibre modem or optical network terminal | Uses fibre-optic technology |
| Mobile broadband modem | Uses a cellular network |
Some technologies discussed in the original module, such as ISDN, ATM and T-carrier lines, are useful for understanding the development of networking but are less common in ordinary home networks today.
21.6 Wireless Access Point
A wireless access point allows wireless devices to connect to a network.
It is commonly used in:
- Offices
- Universities
- Hotels
- Shopping centres
- Large homes
Hardware Comparison Table
| Device | Main Purpose |
|---|---|
| Node | Participates in the network |
| Hub | Connects devices and broadcasts data |
| Switch | Connects devices and sends data to the correct device |
| Router | Connects different networks |
| Modem | Connects a network to an ISP |
| Wireless access point | Provides wireless network access |
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