Download Cisco Networking Academy Program: CCNA 1 and 2 companion by Inc., CISCO Cisco Systems, Cisco Networking Academy PDF

By Inc., CISCO Cisco Systems, Cisco Networking Academy Program, Inc., ILSG Cisco Systems, Aries Cisco Networking Academy Program

Cisco Networking Academy application CCNA 1 and a couple of significant other consultant, Revised 3rd version, is the Cisco authorized textbook to take advantage of along model 3.1 of the Cisco Networking Academy application CCNA 1 and CCNA 2 web-based classes. the themes coated offer you the required wisdom to start your education for the CCNA certification examination (640-801, or 640-821 and 640-811) and to go into the sphere of community management.

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Extra info for Cisco Networking Academy Program: CCNA 1 and 2 companion guide

Sample text

However, in an OR operation, three of the combinations generate a 1 output, and one combination generates a 0 output. The two networking operations that use Boolean logic are subnetwork masking and wildcard masking. Masking operations provide a way to filter addresses. The addresses identify the devices on the network. Masking allows the addresses to be grouped or controlled by other network operations. book Page 32 Tuesday, May 20, 2003 2:53 PM 32 Chapter 1: Introduction to Networking Table 1-9 OR Operation OR 0 1 0 0 1 1 1 1 IP Addresses and Subnet Masks The 32-bit binary addresses used on the Internet are called Internet Protocol (IP) addresses.

So a computer’s IP address usually consists of a network portion and a host portion that represents a particular computer on a particular network. For the computer to know how the 32-bit IP address has been split, a second 32-bit number called a subnetwork mask is used. This mask is a guide that indicates how the IP address should be interpreted by identifying how many of the bits identify the computer’s network. The network mask sequentially fills in the 1s from the left side of the mask. A subnetwork mask is always all 1s until the network address is identified.

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