31266 Lecture Notes - Lecture 7: Wireless Lan, Local Area Network, Wide Area Network
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Telecommunications and Networking
• In this lecture we explained that: A computer network is a collection of computing devices
that are connected in various ways in order to communicate and share resources.
Connections between computing devices can be physical using wires-cables or wireless
using radio waves or infrared signals.
We compared two types of Networks: Local Area Network (LAN) and Wide Area
LAN refers to connected computers (between two and several hundred computers)
that reside in a single geographic location/limited geographic area.Organisation
controls the installation of the transmission media.Connected computers in an office
building or school. Such as computers in a school.
WAN refers to connected computers that are at different geographic locations. Uses
transmission media from vendors that are licensed by government. Connected
computers across state, regional, national areas
You learn about some Network Components
o Network interface card(NIC)- a card inside the computer that lets it send and
receive messages from other computers.
o Switch: network device that cross-connects network devices.
o Router: routes messages from a LAN to the Internet or across a wide area
o access point: a station that transmits and receives data in a wireless local area
o Transmission media: provides the means for data to be streamed from one
device; wired (Twisted pair, Coaxial cable, Fiber-Optic Cable)wireless(radio
waves, infra-red light waves, ultra –sonic waves)
We discussed and compared the wireline communication channels:
o Twisted-Pair Wire: Consists of strands of copper wire twisted in pairs within
a plastic sheath. It is relatively inexpensive to purchase, widely available, and
easy to work with.
o Coaxial Cable: a single strand of insulated copper wire. It is much less
susceptible to electrical interference, and it can carry much more data than
twisted-pair. It is commonly used to carry high-speed data traffic as well as
o Fiber-Optic Cable: consists of thousands of very thin filaments of glass fibers
that transmit information via light pulses generated by lasers. The fiber-optic
cable is surrounded by cladding, a coating that prevents the light from leaking
out of the fiber.
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