00397nam a22001337a 4500008004100000020001500041040005500056080001800111100001800129245004200147260003600189300001500225650002300240230329b        |||||||| |||| 00| 0 eng d  a007135185X  aNational Science LibrarycNational Science Library  aD 681.324bN9  aBrown, Steven  aImplementing virtual private networks  aNew York: bMcGraw-Hill, c1999  axxi, 594p.  aWide area networks