00555 a2200217 4500 9788178080987 004.6 HAL 30607 53812 Halsall, Fred Data commiunication computer networks and open systems 4th. New Delhi Pearson Education 1996 1996 xvi, 907p. 24cm LAN Computer Science Computer Communication Data Transmission Internetworking WAN WAN SR 57116 57116 0 0 0 0 SRC MAIN MAIN REF 2014-11-11 0 004.6HAL 35985 2017-08-24 00:00:00 0.00 2016-10-31 SR