A lot of free packet sniffing utilities are available on the Internet. Consider evaluating Packetyzer for Windows or Ethereal for Linux. There are also many commercial sniffing tools, such as Sniffer by Network General. These tools can help you learn more about encapsulation and packet structure.
Let’s take a look at each of the four layers of TCP/IP and discuss some of the security concerns lassociated with each layer and specific protocols. The four layers of TCP/IP include
- The Application layer
- The Host-to-host layer
- The Internet layer
- The Network access layer