>what is the exact working of CSU/DSU?
Modem on Steroids
>what is the purpose of serial interfaces?
to provide an interface for Serialised data transfer
>what is Bert?
Ernies Roommate (from Sesame Street)
>what is the difference b/w CRC4 & CRC16.
12
>what is the working principal of NET2Phone.
Don't you mean principle ? If so, VoIP with softphones.
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