Please enable JavaScript.
Coggle requires JavaScript to display documents.
1.3 Computer networks, connections and protocols - Coggle Diagram
1.3 Computer networks, connections and protocols
Types of networks
advantages of networking
-
-
-
servers can control security, software updatees and backup data
-
Local Area Network (LAN)
-
-
LANs are wired with UTP cable, fibre optic or wireless using Wi-Fi
Wide Area Network (WAN)
covers a large geographical area, connecting LANs together
-
WANs are connected with telephone lines, fibre optic cables or satellite links
-
Performances of networks
Bandwidth
-
Measured in bits per second, often called bit rate
number of users
too many users or devices on the same network can cause the network to slow down if there is insufficient bandwidth
-
error rate
-
-
signal quality
signal quality of wireless connections is dependant on the range of devices from the wireless access point and other environmental factors
-
-
-
Network models
-
peer-to-peer model
a peer is a computer on a network, and is equal to all other peers
-
-
-
-
-
-
The Internet
-
-
web servers and clients
-
hosted solutions provide 24/7 access, multiple users and greater security
-
-
Modes of Connection
Ethernet
-
-
-
provides reliable, error free, fast communication
-
-
-
-
-
Encryption
Wireless Networks
Wireless networks broadcast data, so it must be decrypted to be secure
- this is done by scrambling the data into cipher text using a "master key" created from the SSID of the network and the password
- data is decrypted by the receiver using the same master key, so this key is not transmitted
- protocols used for wireless encryption include WEP, WPA, WPA2
- a handshake protocol is used to ensure that the receiver has a valid master key before transmission to the device begins
-
Addressing
-
IP addressing
there are two version of IP addresses, IPv4 and IPv6
-
-
-
-
-
-
Layers
used to divide the complex task of networking into smaller, simpler tasks that work with each other
-
-
-