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IP Addressing

The Transmission Control Protocol/Internet Protocol (TCP/IP) is a standard that includes many protocols. It defines how machines on an internetwork can communicate with each other. It was initially funded by and developed for DARPA (Defense Advanced Research Protects Agency), which is a conglomeration of U.S. military and government organizations. Developed initially for the government, it was later made available to the public, mainly seen on Unix systems. First specified in RFC 791, it has become the defacto standard for networking protocols. The Internet uses TCP/IP to carry data between networks, and most corporations today use TCP/IP for their networks. This chapter will provide an overview of TCP/IP, including. | 3 CCNA CISCO CERTIFIED NETWORK ASSOCIATE IP Addressing Figuring Out IP Address Components Two-Minute Drill Self Test 2 Chapter 3 IP Addressing rr T . . he Transmission Control Protocol Internet Protocol TCP IP is a standard that includes many protocols. It defines how machines on an internetwork can communicate with each other. It was initially funded by and developed for DARPA Defense Advanced Research Protects Agency which is a conglomeration of U.S. military and government organizations. Developed initially for the government it was later made available to the public mainly seen on Unix systems. First specified in RFC 791 it has become the defacto standard for networking protocols. The Internet uses TCP IP to carry data between networks and most corporations today use TCP IP for their networks. This chapter will provide an overview of TCP IP including some of its more important protocols as well as IP addressing. e a m It is VERY important that you understand ALL aspects of IP addressing. Therefore spend a lot of time on this chapter. If you don t understand IP addressing when taking the exam you will have a difficult time in passing it. This Exam Watch goes for all three exams INTRO ICND and CCNA. CERTIFICATION OBJECTIVE 3.01 TCP IP Protocol Stack To help articulate how data is moved between devices running TCP IP a model was developed that resembles the OSI Reference Model discussed in Chapter 2. Table 3-1 compares the two models. The following sections will cover the layers of the TCP IP Protocol stack. Application Layer One main difference between the OSI Reference Model and TCP IP s model is that TCP IP lumps together the application presentation and session layers into one layer called the application layer. Here are some common TCP IP applications Cisco devices support DNS HTTP SNMP telnet and TFTP. TCP IP Protocol Stack 3 TABLE 3-1 Comparison of the OSI Reference Model and the TCP IP Protocol Stack Layer OSI Reference Model TCP IP Protocol Stack Layer 7