Whether you use DHCP or static IP addressing, understanding addressing is a very important skill. As a CCNP Support candidate, assumed skills include basic things such as addressing, subnetting, summarizing, and routing. In this section I take the time to review because too many problems occur because of lack of planning with IP addressing. Proper planning prevents poor performance in all circumstances. Besides, you will need these skills in the Trouble Tickets, but more importantly in the real world.

Chapter 1 covered the basics of IP addressing, discussing the 4.2 billion (232), 32-bit, dotted-decimal format. Table 3-9 reviews classes and masks.

Table 3-9. IP Address Classes and Masks
 Class and RangeDecimal MaskBitwise Mask
0A 1–127 ...

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