00274nam a2200109Ia 4500008004100000041001200041082001100053100001600064245007200080260000600152650000600158221030s9999    xx            000 0 und d  aEnglish  a105.23  aB. Forouzan 0aIntroduction  to Data communications and Networkingcby B. Forouzan  c0  aB