Question

what is different between dial up and ISDN
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Answer 1

Answer:

In a dial up connection, the connection is established when you dial a number and you require a modem for that whereas on an ISDN network, you can access the internet over normal telephone lines unlike that of a dial up. ISDN is faster and cost-effective than dial-up though the latter is cheaper.

Answer 2

In a dial up connection, the connection is established when you dial a number and you require a modem for that.
On an ISDN network, you can access the internet over normal telephone lines unlike that of a dial up.
ISDN is faster and cost-effective than dial-up though the latter is cheaper.

Hope it helps you.