00423nam a2200157Ia 4500 2552 20261006003630.0 120911s9999 xx 000 0 und d 020142293X 004.6 HAL Halsall, Fred 3690 Data communications,computer networks and open systems / Fred, Halsall. 4th ed. Addison-Wesley Computer network 3057 2552 2552 0 0 0 0 NU NU 2012-09-11 0 004.6 HAL 3361 2012-09-11 00:00:00 2012-09-11 OS