CCNA Portable Command Guide by Scott Empson

By Scott Empson

Getting ready for the CCNAR examination? listed below are all of the CCNA-level instructions you wish in a single condensed, moveable source. The CCNA moveable Command advisor, moment version, is full of precious, easy-to-access details and is moveable sufficient to be used no matter if you are within the server room or the gear closet. This e-book has been thoroughly up-to-date to hide subject matters within the ICND1 640-822, ICND2 640-816, and CCNA 640-802 checks. Use this speedy reference source that will help you memorize instructions and ideas as you're employed to go the CCNA examination. The consultant summarizes all CCNA certification-level Cisco IOSR software program instructions, key phrases, command arguments, and linked activates, supplying you with tips and examples of the way to use the instructions to real-world situations. Configuration examples through the booklet offer you a greater knowing of ways those instructions are utilized in easy community designs.

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Sample text

Notice that the last octet is all 0s after ANDing. But according to the truth table, anything ANDed to a 0 is a 0. Therefore, any octet ANDed to a subnet mask pattern of 0 is 0! You should only have to convert those parts of an IP address and subnet mask to binary if the mask is not 255 or 0. 0? 0 (There is no need to convert here. 0? 0. The Enhanced Bob Maneuver for Subnetting (or How to Subnet Anything in Under a Minute) Legend has it that once upon a time a networking instructor named Bob taught a class of students a method of subnetting any address using a special chart.

This page intentionally left blank CHAPTER 2 VLSM Variable-length subnet masking (VLSM) is the more realistic way of subnetting a network to make for the most efficient use of all of the bits. Remember that when you perform classful (or what I sometimes call classical) subnetting, all subnets have the same number of hosts because they all use the same subnet mask. This leads to inefficiencies. For example, if you borrow 4 bits on a Class C network, you end up with 14 valid subnets of 14 valid hosts.

0/24—is assigned. You need to create an IP plan for this network using VLSM. 100. You can use only the H bits. Therefore, ignore the N bits, because they cannot change! The steps to create an IP plan using VLSM for the network illustrated in Figure 2-1 are as follows: Step 1 Determine how many H bits will be needed to satisfy the largest network. Step 2 Pick a subnet for the largest network to use. Step 3 Pick the next largest network to work with. Step 4 Pick the third largest network to work with.

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