00345nam a22001097a 450000500170000000800410001702000170005810000210007524500720009625000120016826000550018020241007113517.0241007b        |||||||| |||| 00| 0 eng d  a0-471-5087-2  aJerry Fitzgerald  aBusiness Data Communications b:Basic Concepts, Security and Design  b3rd ed.  bJohn Wiley & Sonsc1990eEnglishhUSAlTK 5105 FIT