00000nam a2200000 a 4500 20251203112616.0 9788132231561 004.6 COW Cowley, John. _ Communications and networking 2nd ed. New Delhi Springer India [2015], c 2012 xix, 251 p. ill. 22 cm. PB 1st Indian reprint 2015. _ Computer networks Computer networks--Security measures Computer network architectures _ _ _ 206519 C 164943 164943 0 0 0 0 PU PU 2017-01-04 636.00 0 004.6 COW 206519 BK