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Networks
systems formed by links
What are examples of networks?
Mail delivery system, telephone system, social networking, and the internet
Computer data network
collection of hosts connected by networking devices such as computers, printers, and small devices
Local Area Network (LAN)
Group of interconnected computers under one administrative control group that governs the security and access control policies in force on the network
Wireless Local Area Network (WLAN)
Wireless form of a LAN
Wide Area Network (WAN)
Connections of multiple smaller networks such as LANs that are in geographically separated locations.
How are WANs usually connected?
Routers
What is an example of a Wide Area Network?
The internet, or the World Wide Web
Ethernet
Standard for wired computer network communications defined by the IEEE
IEE 802.11
WiFi
IEE 802.3
Ethernet
Maximum distance to run an ethernet cable?
100 meters
Ethernet connector types
RJ 11 and RJ 45
What is RJ-11 used for?
Phones, dial-up, fax machines
What is RJ-45 used for?
Desktops, laptops, servers, gaming consoles, routers
What are Unshielded Twisted Pair (UTP) Ethernet cables?
8 pairs of twisted wires, Typically cheaper but lack protection from electromagnetic interference
What are Shield Twisted Pair (STP) ethernet cables?
8 pairs of wires covered with a layer of aluminum to greatly reduce interference. Can be run outside
Coaxial Cables
Copper-cored and surrounded by heavy shielding used for cable television, connecting modems and surveillance cameras
RJ-59
Coaxial cables that are older and lower quality
RJ-6
expensive but improved on the RJ-59
Fiber-optic cables
uses a glass or plastic strand that transmits information using light
Benefits of Fiber-Optic Cables
not affected by electromagnetic interference, improved speed and performance, carries data extremely far
Drawbacks to fiber-optic cables
Expensive, not available everywhere, and most devices lack fiber parts
Multi-Mode Fiber
transmits light (LED)
Single-Mode Fiber
transmits via laser, resulting in further data transmission distance
