BSCI Exam Cram™ 2 (Exam 642-801)

Review of TCP/IP Subnetting

Because the Cisco Certified Network Associate (CCNA) should already have in-depth knowledge of IP addressing, this section is merely a brief refresher course. An IP address is divided into three sections. The first part represents the network address, the second part represents the subnet address (if applicable), and the third part is the actual host address on the major network or subnetwork. Five IP address classes are defined by the IETF. You can determine which class any IP address is in by examining the first four bits of the IP address, or you can simply memorize the values in Table 3.1. Most of the public Class A, B, and C addresses have been assigned, although some ranges are still available for a price. Class ...