TY  - GEN
AU  - Carr, Houston H.
AU  - Snyder,Charles A.
TI  - Data communications & network security
T2  - Schaum's outlines
SN  - 0070636559
U1  - 005.8 
PY  - 2007///
CY  - New Delhi
PB  - Tata Mc-Graw Hill Publishing
N1  - Includes index
ER  -