TCP/IP Basics
To fully understand the mechanisms of network security, and especially filtering employed by firewalls, you need a solid understanding of the Transmission Control Protocol/Internet Protocol (TCP/IP) protocol suite. Thorough knowledge of TCP/IP benefits a security administrator not just in the area of firewall management, but also in routing, switching, maintaining availability, improving network performance, managing network traffic, analyzing protocol, understanding vulnerabilities and exploits, and even performing penetration testing or ethical hacking.
Most networks, including the Internet, use the TCP/IP protocol. The most prevalent version in use is Internet Protocol version 4 (IPv4). However, Internet Protocol version 6 ...
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