GCSE
Computer Science
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Introduction to GCSE Computer Science -
1.1 Systems Architecture -
1.2 Memory and Storage -
1.3 Computer Networks, Connections and Protocols -
1.4 Network Security -
1.5 Systems Software -
1.6 Ethical, Legal, Cultural and Environmental Impacts of Digital Technology -
2.1 Algorithms -
2.2 Programming Fundamentals -
2.3 Producing Robust Programs -
2.4 Boolean Logic -
2.5 Programming Languages and Integrated Development Environments
1. Computer Systems
1.3.6 Wired and Wireless Networks, Protocols and Layers
In this lesson on computer networks, we will cover modes of connection (wired and wireless), encryption for securing data, IP addressing, MAC addressing, networking standards, and common protocols used for data transfer. Then, we shall learn about layers and how they are used in networking protocols, focusing on the 4-layer TCP/IP model.
Latency
Latency refers to the time delay between a user's action (such as clicking a link) and the response from the network or system. It is measured in milliseconds (ms).
- High latency can result in slow loading times and lag, affecting the overall performance and user experience.
- Lower latency is crucial for applications requiring real-time interaction, such as online gaming, video conferencing, and live streaming.
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Create a free accountLatency
- Latency is the time delay between a user’s action and the network’s response, measured in milliseconds.
- High latency causes lag; low latency is important for real-time applications.
Wired Connections
- Wired connections, such as Ethernet, provide stable, high-speed data transmission with low latency.
- They are suitable for fixed installations but limit mobility and may be complex to install.
Wireless Connections
- Wireless connections like Wi-Fi and Bluetooth provide mobility and ease of setup.
- They may suffer from interference, lower speeds, and security vulnerabilities.
Encryption
- Encryption secures data by converting it into unreadable code using keys, protecting it during transmission.
- Only the intended recipient with the correct decryption key can access the original data.
IP Addressing
- IPv4 uses 32-bit addresses (e.g., 192.168.1.1) and supports about 4.3 billion devices.
- IPv6 uses 128-bit addresses (e.g., 2001:0db8::) and supports a much larger address space.
MAC Addressing
- A MAC address is a 48-bit unique identifier hardcoded into a device’s NIC.
- It helps with local communication, switch-based data delivery, and security filtering.
Standards
- Standards ensure compatibility and allow devices and software from different manufacturers to work together.
Common Protocols
- TCP/IP: Fundamental suite for reliable internet communication.
- HTTP/HTTPS: Used for accessing web pages; HTTPS adds encryption.
- FTP: For uploading and downloading files over a network.
- POP: Downloads and removes emails from the server.
- IMAP: Accesses and stores emails on the server for use on multiple devices.
- SMTP: Sends emails between clients and servers.
The Concept of Layers
- Networking is divided into layers to simplify communication and troubleshooting.
- The 4 TCP/IP layers are:
- Application Layer: Provides services like HTTP and SMTP.
- Transport Layer: Manages reliable delivery (TCP, UDP).
- Internet Layer: Handles IP addressing and routing.
- Link Layer: Manages physical connection and device addressing.