Course 2 Module 5 Flashcards

Ad-Hoc network: A network configuration without supporting network infrastructure. Every device involved with the ad-hoc network communicates with every other device within range, and all nodes help pass along messages

Asymmetric Digital Subscriber Line (ADSL): A device that establishes data connections across phone lines and different speeds for uploading and downloading data

Baud rate: A measurement of how many bits could be passed across a phone line in a second

Bluetooth: The most common short range wireless network

Broadband: Any connectivity technology that isn't dial-up Internet

Cable modem: A device that sits at the edge of a consumer's network and

connects it to the cable modem termination system

Cable modem termination system: Connects lots of different cable connections

to an ISP's core network

Channels: Individual, smaller sections of the overall frequency band used by a wireless network

Collision domain: A network segment where only one device can communicate at a time

Data payload section: Has all of the data of the protocols further up the stack of a frame

Dial-up: Uses POTS for data transfer, and gets its name because the connection is established by actually dialing a phone number

DSL: Digital subscriber line was able to send much more data across the wire than traditional dial-up technologies by operating at a frequency range that didn't interfere with normal phone calls

DSLAM: Digital Subscriber Line Access Multiplexers are devices that connect multiple DSL connections to a high-speed digital communications channel

Duration field: Specifies how long the total frame is

Frame check sequence: It is a 4-byte or 32-bit number that represents a checksum value for the entire frame

Frame control field: 16 bits long, it contains a number of sub-fields that are used to

describe how the frame itself should be processed

Frequency band: A certain section of the radio spectrum that's been agreed upon to be used for certain communications

FTTB: Fiber to the building, fiber to the business or even fiber to the basement, since this is generally where cables to buildings physically enter. FTTB is a setup where fiber technologies are used for data delivery to an individual building

FTTH: Fiber to the home. This is used in instances where fiber is actually run to each individual residents in a neighborhood or apartment building

FTTN: Fiber to the neighborhood. This means that fiber technologies are used to deliver data to a single physical cabinet that serves a certain amount of the population

FTTP: Fiber to the premises. FTTH and FTTB may both also be referred to as FTTP

FTTX: Stands for fiber to the X, where the X can be one of many things

HDSL: High Bit-rate Digital Subscriber Lines. These are DSL technologies that provision speeds above 1.544 megabits per second

MAC filtering: Access points are configured to only allow for connections from a specific set of MAC addresses belonging to devices you trust

Mesh networks: Like ad-hoc networks, lots of devices communicate with each other device, forming a mesh if you were to draw lines for all the links between all the nodes

Metered connection: An internet connection where all data transfer usage is tracked. Cell phone plans that have a limit on data usage per month or that charge based on usage are examples of metered connections

Non-metered connection: A connection where your data usage is not tracked or limited, instead you are charged a flat fee for unlimited and unrestricted usage. A Wi-Fi connection is an example of a non-metered connection 

Optical Network Terminator: Converts data from protocols the fiber network can

understand to those that are more traditional twisted pair copper networks can understand

Pairing: When a wireless peripheral connects to a mobile device, and the two devices exchange information, sometimes including a PIN or password, so that they can remember each other

Point-To-Point VPN: Establishes a VPN tunnel between two sites but VPN tunneling logic is handled by network devices at either side, so that users don't all have to establish their own connections

Receiving address: The MAC address of the access point that should receive the frame

Symmetric Digital Subscriber Line (SDSL): A device that establishes data connections across phone lines and has upload and download speeds that are the same

Sequence control field: A field that is 16 bits long and mainly contains a sequence number used to keep track of ordering the frames

Short-range wireless network: It is what mobile devices uses to connect to their peripherals

T-Carrier technologies: Technologies Invented to transmit multiple phone calls over a single link. Eventually, they also became common transmission systems to transfer data much faster than any dial-up connection could handle

Transmitter address: The MAC address of whatever has just transmitted the frame

Wi-Fi Protected Access (WPA): A security program that uses a 128-bit key to protect wireless computer networks, which makes it more difficult to crack than WEP

Wide area network: Acts like a single network but spans across multiple physical locations. WAN technologies usually require that you contract a link across the Internet with your ISP

Wired Equivalence Privacy (WEP): An encryption technology that provides a very low level of privacy. WEP should really only be seen as being as safe as sending unencrypted data over a wired connection

Wireless access point: A device that bridges the wireless and wired portions of a network

Wireless LANS (WLANS): One or more access points act as a bridge between a wireless and a wired network

Wireless networking: Networks you connect to through radios and antennas