00277nam a2200109Ia 4500008004100000041001200041082001100053100001700064245007400081260000600155650000600161221030s9999    xx            000 0 und d  aEnglish  a105.23  aUyless Black 0aComputer Networks Protocols, Strandards & Interfacescby Uyless Black  c0  aB