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38 Cards in this Set
- Front
- Back
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Bandwidth |
Amount of data that can be transferred in a given time |
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NIC |
Allows a device to connect to a network |
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Switch |
Connects devices on a LAN. Transmits data to the device with the MAC address |
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Routers |
Responsible for transmitting data between networks, connected to 2+ networks |
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Ethernet |
Copper wired cable |
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Fibre optic |
Transmits data as light |
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WAP |
Wireless access point. A switch that allows devices to connect WIRELESSLY. |
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Client Server Newtorks |
Managed by a server which connects the clients. HAS A SWITCH Files and software stored centrally on server. Client requests server responds Pros: Back ups/installing/updating software easier Easier Network security management Reliable Cons: Expensive and needs maintenance Dependent on server Overload on server |
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Peer - peer network |
Connects directly WITHOUT server Store files individually Pros: Easy to maintain No server dependance Cons: No management, updates and security all installed individually Less reliable, data may be lost Machines prone to slow down |
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URL |
UNIFORM RESOURCE LOCATOR Addresses used to access web servers and the resources on them. HTTPS ^^^PROTOCOL WWW.CGPBOOKS.CO.UK ^^^DOMAIN NAME LINKED TO AN IP ADDRESS STUDENT/BOOKS_GCSE_CS ^^^PATH TO SPECIFIC FILE/PAGE |
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DNS |
Domain Name server, translates a website's domain name into an IP address |
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Hosting |
When a business uses it's servers to store files of another organisation |
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Cloud (pros/cons) |
Hosting where users store files online. Pros: Access files from any connected device Easy to increase storage capacity No expensive hardware needed No IT staff needed Security and backup provided Updated automatically Cons: Internet connection required Dependent on host Vulnerability to hackers Ownership issues Subscriptions expensive |
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Virtual network |
A network entirely software based. Partions off some of the physical networks bandwidth Shares same hardware Benefits: More efficient Has it's own security |
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VPN |
Virtual private network. Sends data securely over a WAN. Prevents hackers accessing data Sends through a VPN server to change location |
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VLAN |
Virtual LAN splits a LAN into several separate networks with the same hardware |
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Secondary storage (features) |
Non volatile Stores all programs including OS and all data MEASURED AS CAPACITY |
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Read speed |
How long it takes to load |
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Write speed |
How long it takes to save something |
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Portability |
Ability to be easily carried or moved |
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Durability |
Ability to withstand damage |
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Lifespan |
Electronic memory read/write cycles limited. Lifetime shortens considerably. |
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Reliability |
How consistently a component performs according to its specifications |
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Network |
Two or more NODES that are joined with transmission media so they can share data and/or resources. |
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LAN |
local area network Covers small geographical area All hardware owned by organisation using it Wired or wireless LAN=NODES+TRANSMISSION MEDIA+SWITCH/WAP |
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WAN |
wide area network WAN connects LAN'S that are in different geographical locations Companies usually hire the infrastructure Often uses telephone lines Wired or wireless WAN=NODES+TRANSMISSION MEDIA+ROUTER |
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switch vs router |
SWITCH -Connects devices in a LAN -Uses MAC addresses -Sends data in frames ROUTER -Connects 2 or more networks -Uses IP addresses -Sends data in packets |
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LAN vs. WAN |
LAN: -small area -building/campus use -company owns their equipment -private infrastructure -wired or wireless WAN: -large area -city/country -company hires equipment -public infrastructure -wired or wireless |
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LAN (HARDWARE) |
NIC, SWITCH/ROUTER/WAP, TRANSMISSION MEDIA |
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WiFi |
Wireless networks use radio waves of different frequencies Uses 2.4GHz and 5GHz frequencies |
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Client |
A computer that recieves services from a server |
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Peer |
Requests services AND provides services to other peers in a network |
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Impacting performance (network) |
Bandwidth, user/use drain, type of transmission media, wired or wireless network, hardware and topology |
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User/use drain |
The more users connected, more bandwidth shared and performance decreases |
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Types of transmission media |
-Fibre optic -Copper/Ethernet cables -Frequency of radio waves also affects performance due to interference etc. |
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The INTERNET |
A network of networks WAN which connects devices and networks across the world using TCP/IP |
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IP address |
Every device has a unique internet protocol address so it can be found by other devices |
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SaaS |
SOFTWARE AS A SERVICE software stored in the cloud, usually paid for by subscription |
