TY  - BOOK
AU  - Northcutt, Stephen.
AU  - Zeltser, Lenny
AU  - Winters, Scott
TI  - Inside network perimeter security: the definitive guide to  firewalls, VPNs, routers, and intrusion detection systems 
SN  - 8178087618
PY  - 2002///
CY  - Delhi.
PB  - Pearson Education
KW  - Computer networks
KW  - Security measures
N1  - Includes bibliographical references and index
ER  -