Unit 3 - Chapter 7 Flashcards
Computer Networks
a set of independent computer systems connected by telecommunication links for the purpose of sharing information and resources.
Nodes ( or hosts)
Individual computers on a network
Modem
Modifies the physical characteristics of the carrier wave, such as amplitude or frequency, so that it is in one of two distinct states, one state representing 0 and the other state representing 1.
Bandwidth
The maximum rate of data transfer across a given path.
Broadband
any communication link with a transmission rate of +256kbps
Digital subscriber line ( DSL)
uses same wires as telephones but transmits digital data
Wi-Fi ( Wireless fidelity)
Standard for wireless local access i.e IEEE802.11 wireless network standards
Wireless wide area network ( WWAN)
Communication from device to antenna on top of a tower ( Remote base station from telecom company). I.e. 5G, LTE
Repeater
a device that simply amplifies and forwards a signal
Bridge
a “ smarter” device that has knowledge about the nodes located on each separate network. It examines every message to see if it should be forwarded from one network to another.
Wide area network ( WAN)
Connects devices that are not in close proximity but rather across town, across country, or across the ocean.
Packet
An information block with a fixed maximum size that is transmitted through the network through a single unit.
ISP
Internet service provider. A business whose purpose is to provide access from a private network ( such as a corporate or university network) to the internet or from an individual’s computer to the internet.
Protocol
is a mutually agreed upon set of rules, conventions, and agreements for the efficient and orderly exchange of information.
Protocol hierarchy
also called protocol stack, has five layers this hierarchy is also referred to as TCP/IP, after the names of two of its most important protocols.
