computer science 1.3.2

computer science 1.3.2

1. types of networks

   • WAN
     • multiple LANs for a large geographical area
   • LAN
     • devices connected to a local network used for small businesses and schools

2. factors that affect the performance of a network

   • number of users connected
   • types of connection to the network
     • wired
     • wireless
   • amount of bandwith availiable internet speed

3. client server model

   • client
     • the client, makes a service request from another, the server.
     • the client is dependent on the server to provide and manage the information.
   • server
     • Popular websites need powerful servers to serve thousands or millions of clients, all making requests at the same time.

4. network hardware

   • wireless access point
   • routers
   • switches
   • Network interface controller
   • transmision media

5. the internet as a collection of worldwide connected computers

   • DNS
   • hosting
   • the cloud
   • web servers and clients

6. star and mesh topologys

   • star topology
   • mesh topology

7. modes of connection

   • wired
     • ethernet
   • wireless
     • wifi
     • bluetooth

8. encryption

   • end to end encription uses 3 keys 2 private one public

9. ip addressing and MAC addressin

   • When connected to a network each device is given a unique IP address. This address consists of four sets of up to three digits, each with a maximum value of 255, which are separated by dots. An example is: 192.168.0.254
   • A MAC address is a unique serial number assigned to each network interface controller (NIC). This allows a network to uniquely identify any device, even when a dynamic IP address is assigned using DHCP, each time the device connects to a network. The device’s IP address changes depending on the network and the MAC address is unique to the device. A MAC address consists of a string of hexadecimal numbers. An example is: 1A:5B:6H:98:78:35

10. standards

11. common protocols

    • TCP
    • HTTP
    • HTTPS
    • FTP
    • POP
    • IMAP
    • SMTP

12. the concept of layers

    • In networking, layering means to break up the sending of messages into separate components and activities. Each component handles a different part of the communication. This can be referred to as the Transmission Control Protocol/Internet Protocol (TCP/IP) model.