TY  - BOOK
AU  - "Northcutt, Stephen"
TI  - Inside network perimeter security: "the definitive guide to firewalls, Vpns, routers, and intrusion detection systems"
SN  - 81-7808-761-8
U1  - 004.6 
PY  - 2002///
CY  - India
PB  - Pearson Education
ER  -