LAN: A local area network is specific to a single site. A school network would be a LAN. Even though it has more than one building it is still the same site. The hardware needed for a LAN network would be owned by the business using it, the school.
1 of 16
What is a WAN?
A Wide area network is over a large geographical area it is the connection of LAN's. The internet would be a a WAN as it is allot of networks connected together. The hardware would eb owned by a tellecomunicatiosn sevice. E.g. Virgin Boradband.
2 of 16
Factors Effecting Performance ?
#1: Bandwidth. The more bandwidth then the more data than can be passed at once. Therefore the more bandwidth the faster the network.
3 of 16
Factors Effecting Performance ?
#2: The more users on the network the more data geting transmitted and therefore slowing down the network with more traffic.
4 of 16
Factors Effecting Performance ?
#3: Wired connections are much faster than wireless are the connection is direct and theirs no interference. Causing packets to be lossed making the data corrupt and requiring certain aspects to be sent more than once.
5 of 16
Factors Effecting Performance ?
#4: If the network is wireless and there are phsical barriers stoping the tansmition then the network will not work correctly so more hardware has to be used to make sure that all of the codes are in range of a assess point.
6 of 16
Network Hardware
#1: Wirless acesspoints are needeed to broadcast the signals and to ensure that the computers are in range and stay connected to the network.
7 of 16
Network Hardware
#2: Network interface card (NCI) allows the devicve to connect the device to a network. Needed for both wired and wirless. Used to be a sepperate card but now built on motherboard.
8 of 16
Network Hardware
#3: Switches connect devices on a LAN by passing units called frames from one mac adress to another.
9 of 16
Network Hardware
#4: Routers are responible for transmitting data between networks so are alwasy connected to atleat two LAN's. The do this by directing packets to to their destination.
10 of 16
Cables - Ethernet
Most common for connection and cables CAT5e and CAT 6 are the most poluar. They are twisted pair cabels. Four pairs of twisted copper wire to reduce internal interferance.
11 of 16
Cables - Coaxial
Made of a single copper wire surrounded by a plastic layer of insulation and a metallic mesh which provides shielding from external interference.
12 of 16
Cables - Fiber Optic
Fiber optic cables transmit data as light. Very high performance and therefore expensive cables. They don't suffer interference and can transmit over very large distances without loss of signal strength.
13 of 16
Wireless
Uses radio waves to transmit data. You need a Wirless Acess point to get onto the network.
14 of 16
Wi-Fi is the Standard for Wireless
Wi-Fi uses two frequency bands - 2.4GHz and 5GHz. 2.4GHz has greater range and penetration through walls. However 5GHz can is faster but only over they shorter distances.
15 of 16
Wireless Frequency Bands
The Channels are split in to numbered bands. The Channels in 2.4GHz overlap and ocasionally experiance interferance. so to avoid this channels that don't overlap are used. 5GHz has less overlapping channels.
16 of 16
Other cards in this set
Card 2
Front
What is a WAN?
Back
A Wide area network is over a large geographical area it is the connection of LAN's. The internet would be a a WAN as it is allot of networks connected together. The hardware would eb owned by a tellecomunicatiosn sevice. E.g. Virgin Boradband.
Comments
No comments have yet been made