Network issues and communication Revision Notes

When data is transferred across a network, it is vulnerable to interception or unauthorized access. Privacy ensures that personal or sensitive information is not exposed to unintended parties, while confidentiality means that data is only accessible to authorised users.

Passwords act as the first line of defence by restricting access to systems and data. A strong password typically contains a mix of uppercase and lowercase letters, numbers, and symbols, making it difficult to guess or crack. For example, "T3ch#2024!" is stronger than "password123".

To prevent passwords from being intercepted by spyware or keyloggers, users should regularly update anti-spyware software and change passwords frequently. This reduces the risk of attackers capturing login credentials and gaining unauthorized access.

• Privacy and confidentiality protect data from unauthorized access during transfer.
• Passwords restrict access; strong passwords are complex and hard to guess.
• Regular anti-spyware updates and password changes prevent interception.

Authentication confirms that a user is who they claim to be before granting access. Various methods exist, each with different security levels and applications.

Zero login allows automatic access without entering credentials, often used in trusted environments but less secure.

Biometric systems use unique physical traits such as fingerprints or facial recognition, providing high security because these traits are difficult to replicate. For example, unlocking a smartphone with a fingerprint scanner is biometric authentication.

• Zero login: automatic access without password entry, convenient but less secure.
• Biometric systems: use fingerprints, facial recognition for strong identity verification.
• Magnetic stripes: cards with data strips read by devices, common in access cards.
• Smart cards: embedded chips store data securely, used in banking or secure entry.
• Physical tokens: hardware devices generating one-time codes for login.
• Electronic tokens: software apps generating codes, e.g., authenticator apps on phones.

Malware includes viruses, worms, and spyware that can damage systems or steal data. Anti-malware software detects, removes, or quarantines these threats to protect devices and networks.

It is essential to keep anti-malware software up to date because new malware variants appear frequently. Outdated software may fail to detect recent threats.

Before transferring data using storage media like USB drives, scanning the media helps prevent spreading malware. Similarly, scanning downloaded files or software before opening them reduces infection risks.

• Anti-malware software detects and removes malicious software.
• Regular updates ensure protection against new threats.
• Scan storage media before data transfer to avoid malware spread.
• Scan downloaded data/software before use to prevent infection.

Electronic conferencing enables communication between people in different locations using networks. The main types are video conferencing, audio conferencing, and web conferencing.

Video conferencing requires cameras, microphones, speakers, conferencing software, and a stable network connection with sufficient bandwidth to transmit video and audio smoothly. An example is a business meeting via Zoom.

Audio conferencing needs microphones, speakers or headsets, conferencing software, and a reliable network connection. It is useful for voice-only meetings or discussions, such as conference calls using Skype.

• Video conferencing: real-time video and audio communication; needs camera, mic, speakers, software, good bandwidth.
• Audio conferencing: voice communication only; requires mic, speakers/headset, software, network.
• Web conferencing: sharing presentations, documents, or screens; needs software supporting collaboration tools and network.
• Each type requires appropriate hardware, software, and network infrastructure to function effectively.

Electronic conferencing saves travel time and costs by allowing remote meetings, increasing flexibility and enabling collaboration across different locations.

It supports quick decision-making and can include features like screen sharing, recording, and chat.

However, technical problems such as poor internet connections, audio/video lag, or software glitches can disrupt meetings. Additionally, electronic conferencing may reduce personal interaction and non-verbal communication cues, which can affect relationship building and understanding.

• Benefits: saves travel time, enables remote collaboration, supports quick decisions.
• Drawbacks: technical issues can disrupt communication, less personal interaction than face-to-face.