Networking Network SecurityNetworking - Network Security
Network Security
Firewalls
Packet-filtering Firewalls
Circuit-level Firewalls
Application Gateway Firewalls
Proxy Servers
Caching Proxy Servers
Using a Proxy Server
When Two Become One
Understanding How Security Affects a Network
Blocking Port Numbers
Port Blocking and Network Users
Authentication
Passwords and Password Policies
Password Policies
Password Strength
PasswordsThe Last Word
Encryption
Implementing Encryption
Extranets and Intranet
Intranets
Extranets
Two important elements of a network security strategy are the use of proxy servers and firewall systems. A firewall system acts as a protective layer to network access by controlling the traffic that passes between the interfaces on a system.