Computer Science Section 1 Mind Map

Computer Science Section 1 Mind Map

1. TCP/IP Stack

   • It is a complete set of networking protocols.
   • It is the most common protocol and consists of 4 layers
   • Examples are http, ftp, POP3, SMTP, telnet.
   • A TCP/IP stack is, roughly spoken, a piece of software for communicating with other network devices.

2. DNS

   • Domain name system
   • Helps computers exchange data through the internet.
   • Which manages a massive database that sources domain names to IP addresses.
   • Computers use DNS servers to look for domain names you are trying to access.

3. LANs & WANs

   • WAN - Wide are network
   • LAN - Local are network
   • LAN - is very quick however it is limited to a small area.
   • WAN - Larger shared area however it costs a lot and it is not very fast.
   • LAN - Advantages; Data can be shared easily, Central backup, Message, software can be shared, stored in a central place.
   • LAN - Disadvantages; Printing can be slow, Virus can be spread easily, Greater need for secutiry, If server fails all workstations will fail, Cost, Cable damage affects computers.
   • WAN - Advantages; There is a wider scale, Far greater, Can be world wide.
   • WAN - Disadvantages; Security is even more important, vulnerable to hackers, Easy to intercept data such as bank details and addresses.

4. Packet and Circuit switching

   • Packet switching moves data in separate small blocks
   • When packets are received they are reassembled in the proper sequence to make up the message

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