J277 OCR Computer Science Unit 1.3 Revision Sheets / Practice Questions

NEW J277 SPECIFICATION

Here you will find easy to follow revision sheets which will help your students to recap the topic:
1.3 Computer Networks, Connections and Protocols

1.3.1 Networks and topologies ¨ Types of network:
o LAN (Local Area Network)
o 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:
o Wireless access points
o Routers
o Switches
o NIC (Network Interface Controller/Card)
o Transmission media
¨ The Internet as a worldwide collection of computer networks:
o DNS (Domain Name Server)
o Hosting
o The Cloud
o Web servers and clients
¨ Star and Mesh network topologies

1.3.2 Wired and wireless networks, protocols and layers ¨ Modes of connection:
o Wired
• Ethernet
o Wireless
• Wi-Fi
• Bluetooth
¨ Encryption
¨ IP addressing and MAC addressing
¨ Standards
¨ Common protocols including:
o TCP/IP (Transmission Control Protocol/Internet Protocol)
o HTTP (Hyper Text Transfer Protocol)
o HTTPS (Hyper Text Transfer Protocol Secure)
o FTP (File Transfer Protocol)
o POP (Post Office Protocol)
o IMAP (Internet Message Access Protocol)
o SMTP (Simple Mail Transfer Protocol)
¨ The concept of layers