Page 386 - StudyBook.pdf

370 Chapter 6 • Infrastructure Security: Devices and Media

Figure 6.3 Stateful Inspection Technology
Stateful Inspection

Client Server

Application
Presentation
Session
OSI Model OSI Model
Transport
Application Application
Presentation Presentation
State Inspected
Session Session
Authorized
Transport Packet Transport
Network Network Network
Data Link Data Link Data Link

Physical Physical Physical

TEST DAY TIP
Firewalls comprise one of the most important aspects of network secu-
rity as it relates to connections to the Internet. If you understand the
basic concepts of how the different firewalls work and know the proper
place to implement them, you will do fine on these Security+ exam
questions. You do not have to be a firewall specialist to pass the
Security+ exam; you just have to know what they are, how they work,
what to do with them, and how the different types of firewalls should
be configured.
Keep in mind that while a firewall is important to infrastructure
security relating to Internet connections, it is not the only aspect of net-
work security. All of the subjects discussed in this book should be taken
into consideration as part of your overall security plan. The Security+
exam expects you to have a general knowledge of all important security
concepts, not just specific devices such as firewalls.

www.syngress.com