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CCIE Security Exam Certification Guide by Henry Benjamin

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Internet Protocol

Internet Protocol (IP) is a widely used networking term that describes a network layer protocol that logically defines a distinct host or end system, such as a PC or router, with an IP address.

An IP address is configured on end systems to allow communication between hosts over wide geographic locations. An IP address is 32 bits in length, with the network mask or subnet mask (also 32 bits in length) defining the host and subnet portion.

Figure 2-6 displays the IP packet header frame format in detail.

Figure 2-6. IP Frame Format

The following describes the IP packet fields illustrated in Figure 2-6:

  • Version— Indicates the version ...

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