OCR J277/01 – 1.3 Computer networks

1.1 System Architecture - Overview / Checklist
1.3.1 Networks and topologies
Types of network:

    LAN (Local Area Network)
    WAN (Wide Area Network)

Factors that affect the performance of networks
The different roles of computers in a client-server and a peer-topeer network
The hardware needed to connect stand-alone computers into a Local Area Network:

    Wireless access points
    Routers
    Switches
    NIC (Network Interface Controller/Card)
    Transmission media

The Internet as a worldwide collection of computer networks:

    DNS (Domain Name Server)
    Hosting
    The Cloud
    Web servers and clients

Star and Mesh network topologies

1.3.2 Wired and wireless networks, protocols and layers
Modes of connection:

    Wired

      Ethernet

    Wireless

      Wi-Fi
      Bluetooth

Encryption
IP addressing and MAC addressing
Standards
Common protocols including:

    TCP/IP (Transmission Control Protocol/Internet Protocol)
    HTTP (Hyper Text Transfer Protocol)
    HTTPS (Hyper Text Transfer Protocol Secure)
    FTP (File Transfer Protocol)
    POP (Post Office Protocol)
    IMAP (Internet Message Access Protocol)
    SMTP (Simple Mail Transfer Protocol)

The concept of layers

Recommended Resources

Further Reading…

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