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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 3: IP Addressing

Exam Objectives

Describing the purpose of IP addressing

Identifying responsible IP address issuing authorities and their methods

Separating IP addresses using network and host ID bits

Understanding the differences between public and private addressing

Identifying reserved addresses

Describing the three major classes of network addressing

Interpreting subnet masking techniques

Explaining broadcasting

Describing Address Resolution Protocol and its purpose

This chapter explores the purpose and hierarchy of IP addressing in detail. I examine the process of logical network and host addressing, subnet masks, and the classes of logical IP addressing. Private and broadcast addresses are clarified, and real-world addressing examples are given so that you will have a clear understanding of how IP addressing works. This is essential information needed to pass the exam. But never fear! Understanding IP addressing is not as difficult as you may think!

The Purpose of IP Addresses — It’s All about the Delivery

The major purpose of IP addressing is to exchange data across the network between two hosts using datagrams, or packets. Packets are broken-up independent pieces of data that consist of header and trailer information, and they contain source and delivery addresses, along with various control information. These source and destination addresses allow packets to reach the proper destination; the packets can then be reassembled in the proper sequence by the receiving ...

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