tailieunhanh - CompTIA Network+ Certification Study Guide part 30

CompTIA’s Network+ certification Study Guide part 30 is a globally-recognized, vendor neutral exam that has helped over 235,000 IT professionals reach further and higher in their careers. The 2009 Network+ exam (N10-004) is a major update with more focus on security and wireless aspects of networking. Our new study guide has been updated accordingly with focus on network, systems, and WAN security and complete coverage of today’s wireless networking standards. | 276 CHAPTER 6 The OSI Model and Networking Protocols layers for standard reliable network communications physical data link network transport session presentation and application. The acronym commonly used to remember this is in reverse order all people seem to need data processing. If you were to follow each layer and map to it a protocol and a device then by reading this chapter you would remember that the physical layer is responsible for signaling transmission medium and 1s and 0s traversing the wire. As we move up the model things get increasingly more complex. The next layer the data link layer is where your MAC address is located. We discussed the functionality of a NIC card and what a MAC address is. On Ethernet NICs the physical or MAC address also called the hardware address is expressed as 12 hexadecimal digits arranged in pairs with colons between each pair for example 12 3A 4D 66 3A 1C. In binary notation this translates to a 48-bit or 6-byte number with the initial 3 bytes representing the manufacturer and the last 3 bits representing a unique NIC made by that manufacturer. The data link layer is subdivided into two sublayers known as the LLC and MAC layer. The LLC sublayer is responsible for providing the logic for the data link and thus it controls the synchronization flow control and error checking functions of the data link layer. The TCP IP protocol suite provides the functionality specified in the OSI model using the four related layers of the DoD model Network Interface Internet Host-to-Host and Application. The Network Interface maps to the physical and data link layers and the Internet layer maps to the OSI network layer. The Host-to-Host layer maps to the transport layer and DoD s application layer maps to the session presentation and application layers of the OSI model. Some of the more commonly known application layer protocols are FTP HTTP POP3 WINS DNS and DHCP. Understanding the details of the TCP IP protocol suite is fundamental to .

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