5.1 - Understanding Networks

5.1 - Understanding Networks

1. 5.1.1. Understand why computers are connected in a network

   • purpose is to allow computers to share resources - peripherals, data
   • Advantages
     • sharing peripherals & resources = saves money
     • security improved - users cannot see each others files
     • central storge = data easy to backup
     • updates are easier
   • Disadvantages
     • Communication media = expensive
     • Manamegment = complicated
     • hacking, viruses infiltrate more easily

2. 5.1.2. Understand the different types of networks (LAN, WAN) and usage models (client-server, peer-to-peer)

   • Local Area Network
     • A network which covers a small area
     • Found in
       • Businesses
       • schools
       • universities
     • Advantages
       • data transfer = faster than wireless
       • stable once configured, doesn't require much maintenance
       • Wire does not need to be replaced
     • Disadvantages
       • limited ability to relocate without setting up additional switches & cables
       • Network problems = specialist = expensive
   • Wide Area Network
     • A network which covers a wide geographical area
     • Internet is a WAN
     • Advantages
       • Installation is easy
       • Can be inexpensive
     • Disadvantages
       • Transfer speed is not as fast as a wired LAN
       • WAN connection is handled by your ISP
   • client-server
   • peer-to-peer

3. 5.1.3. Understand wired and wireless connectivity

4. 5.1.4. Understand that network data and speeds are measured in bits per second (Mbps, Gbps)

5. 5.1.5. Understand the role of and need for network protocols (Ethernet, Wi-Fi, TCP/IP, HTTP, HTTPS, FTP, email (POP3, SMTP, IMAP)

6. 5.1.6. Understand that data can be transmitted in packets using layered protocol stacks (TCP/IP)

7. 5.1.7. Understand characteristics of network topologies (bus, ring, star, mesh)