Discussion
Which of the following are not the features of ISDN ?
(i) Simultaneous Digital transmission
(ii) Set of communication standards
(iii) Creates and combines packets
(iv) Program to visit web pages
Answer: C
The two that are not features of ISDN are (iii) and (iv), so the answer is (iii) and (iv) are correct.
ISDN, the Integrated Services Digital Network, is a set of communication standards (ii) for simultaneous digital transmission (i) of voice, data and video over the ordinary telephone network, for example on two 64 kbps B channels at once.
Creating and combining packets (iii) describes a packet assembler/disassembler on a packet-switched network such as X.25, whereas ISDN is basically circuit-switched. A program to visit web pages (iv) is a web browser, software rather than a network standard. So codes including (i) or (ii) are wrong.
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