CS 202 MODULE 2 NOTES
CS 202 MODULE 2 NOTES CS 202
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This 3 page Study Guide was uploaded by Kayla Peel on Wednesday March 30, 2016. The Study Guide belongs to CS 202 at University of Alabama - Tuscaloosa taught by Ralph E. Hooper in Winter 2016. Since its upload, it has received 32 views. For similar materials see Intro to the Internet in ComputerScienence at University of Alabama - Tuscaloosa.
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Date Created: 03/30/16
MODULE 2 NOTES As with all forms of communication, telecommunication requires a sender, a receiver, a signal that contains information, and a medium over which the signal travels. The data transmission rate is referred to a s the bandwidth and is measured in bits per second (bps): 1 Gbps= 1,000,000,000 (Giga) 100 times faster than National Average 1 Gbps= 100xNational Average= 10 Mbps WiFi (wireless fidelity): wireless networking technology that uses access points to wireless connection. o Max range: about 1000ft (300 meters) in open areas; 250400ft otherwise Long Term Evolution (LTE): a 4 generation wireless broad band technology that was developed to allow GSM cellular technology to evolve to provide very highspeed internet access. Bluetooth enables a wide assortment of digital devices to communicate directly with each other wirelessly over short distances. o Piconet (very small connection) o Communication speeds up to 1 Mbps o Range up to 33 feet (10 meters) Network Control Devices o Hub: A small electric box used as a central point for connecting a series of computers; sends the signal from each computer to all the other computers on the network. Have, today, been replaced by switches o Switch: A fundamental part of most networks; makes it possible for several users to send information over a network at the same time. Switches direct signals to the intended recipient only. o Repeater: Connects multiple network segments; listens to each segment and repeats the signal heard on one segment onto every other segment connected to the repeater. Helpful with weak signal that requires a boost to continue on the medium. o Bridge: Connects two or more network segments, as a repeater does; also helps to regulate network traffic. o Gateway: A network point that acts as an entrance to another network. o Router: Determines the best for passing a data packet between networks to its destination. o Wireless Access Point: Typically, a WiFi device, connected to a wired or cellular network to send and receive data to wireless adapters installed in computers and other devices; it allows devices to connect to a network wirelessly o Firewall: Device or software that filters the information coming into a network; it protects the network computers from hackers, viruses, and other unwanted network traffic. Types of Cable o Twisted Pair: Pairs of twisted wires covered with an insulating layer, used for telephone and computer networks. Available in varying categories (“cat”) to support a wide range of bandwidths. o Coaxial: An inner conductor wire surrounded by insulation, a conductive shield, and a cover used for cable TV and other applications. Supports faster data speeds but is more expensive than twisted pair. o Fiberoptic: Consists of thousands of extremely thin strands of glass or plastic bound together in a sheathing (a jacket); transmits signals with light beams. Much faster than the other two, but more expensive. Used for backbones of telecom networks and in some wide area and local area networks Network Connective Devices o Dialup Modem: Provides narrowband internet connections over phone lines o Cable Modem: Provides internet access to PCs and computer networks over a cable TV o DSL Modem: Similar to a cable modem but provides highspeed internet service over telephone lines. o Network Interface Card (NIC): A circuit board or PC card that, when installed, provides a port for the device to connect to a wired network with traditional network cables. o Wireless Adapter: A circuit board, PC card, or an external device that connects through an antennaequipped USB port that is able to send and receive network radio signals. Cell Phone Generations: 1. The original analog cell phone network 2. Digital cell phone service 3. Internet services over cellular networks 4. Highspeed internet service over cellular networks WiMAX (World Wide Interoperability for Microwave Access) (IEEE 802.16): A fourth generation wireless broadband tech that evolved from WiFi to provide faster internet access at a longer range o Built on WiFi standards and can interoperate with WiFi networks. o Access point has a 31 mile (50 kilometer) range Local Area Network (LAN): a privately owned computer network that connects computers and devices with in the same building or local area (geographic) o Designed to serve an entire city are called Metropolitan Area Networks (MANs) Wide Area Network (WAN) connects LANs and MANs between cities, across countries, and around the world, using microwave and satellite transmission or telephone lines.
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