Which WAN switching technology is used with ISDN?
A.
packet switching
B.
virtual switching
C.
circuit switching
D.
cell switching
Explanation:
Circuit switching dynamically establishes a connection between a source and a destination. The connection
cannot be used by other callers until the circuit is released. Circuit switching is the most common technique
used with the public switched telephone network (PSTN) to make phone calls. During a call, a dedicated virtual
circuit is temporarily established between the caller and receiver for the duration of the call. Once the caller or
receiver hangs up the phone, the circuit is released and is made available for other users.
Packet switching is a technique popularly used for transfer of data that is not delay sensitive and does not
require real-time transfer rates from a sender to a receiver. Also unlike circuit switching which makes a fixed
amount of bandwidth available for the connection (which may not be fully utilized) packet switching uses
bandwidth more efficiently. With packet switching, the data is broken into labeled packets and is transmitted
using packet-switching networks.
Cell switching is used by Asynchronous Transfer Mode (ATM). ATM is an International Telecommunication
Union-Telecommunications (ITU-T) standard for transmission of data, voice, or video traffic using a fixed size
frame of 53 bytes, known as cells. Of these 53 bytes, the initial five bytes are header information and the
remaining 48 bytes are the payload. These cells are transmitted over a path that may vary with each cell. It
does not maintain a dedicated virtual circuit.The term “virtual switching” is incorrect because it is not a valid WAN switching technology.
Objective:
WAN Technologies
Sub-Objective:
Describe WAN access connectivity optionsCisco Documentation > Internetworking Technology Handbook > Introduction to WAN Technologies > Circuit
Switching