Unit 7 Assignment 1
Multiple Choice
1.) A 11.) C
2.) A, B 12.) A
3.) B, D 13.) A, D
4.) A 14.) C
5.) A 15.) B, C
6.) B, D 16.) B, D
7.) A 17.) C
8.) C 18.) B, D
9.) C 19.) A, C
10.) D 20.) B, C
Key Terms
Switched circuit - A circuit established through one or more intermediate switching devices, such as circuit switches or packet switches.
Dedicated circuit - it is used in reference to a phone or data line, or to an electrical circuit.
Circuit switching - a methodology of implementing a telecommunications link in which two network nodes establish a dedicated communications channel (circuit) through the network before the nodes may communicate.
Packet switching - a digital networking communications method that groups all transmitted data into suitably sized blocks that are transmitted through a medium that may be shared by multiple simultaneous communication sessions.
Leased line - connects two locations for private voice and/or data telecommunication service.
Time-division multiplexing -a method of transmitting and receiving independent signals over a common signal path by means of synchronized switches at each end of the transmission line so that each signal appears on the line only a fraction of time in an alternating pattern.
T-carrier system – one of several digital transmission systems developed by Bell Labs, sometimes called T-CXR.
DS0 – a standard digital transmission rate for digital telecommunications, stands for Digital Signal Zero.
DS1 – a T-carrier signaling scheme, devised by Bell Labs, that is widely used standard in telecommunications, stands for Digital Signal 1.
Frame relay - Telecommunications technology that breaks data stream into small data packets called frames, to provide transmission speeds of 64Kbps to 2.4Gbps at relatively lower costs.
Acronyms
ATM - Asynchronous Transfer Mode
DTE - Data Terminal Equipment
PTT - Postal, Telephone, and Telegraph
CO - Central Office
ESS - Extended Service Set
PVC - Permanent Virtual Circuits DCE - Data Communication Equipment
FRF - Frame Relay Forum
SONET - Synchronous Optical Network Technology
Demarc - Demarcation
HDLC - High Data Link Control