00489nam a22001457a 4500008004100000020001800041040005500059080001800114100001900132245006800151260006900219300001600288650001400304653002500318230329b        |||||||| |||| 00| 0 eng d  a0-07-041267-7  aNational Science LibrarycNational Science Library  aD 681.324bP8  aZacker, Craig   aUpgrading & troubleshooting networks: bThe complete reference   aNew Delhi: bTata Mcgraw-Hill Publishing Company Limited, c2008  axxv, 918p.   aNetworks   aOSI reference model