Download Computer Networking First-Step by Wendell Odom PDF

By Wendell Odom

Your first step into the area of computing device networking No event required contains transparent and simply understood factors Makes studying effortless Your first step to machine networking starts off the following! examine uncomplicated networking terminology know how info is routed from position to put discover net connectivity secrets and techniques defend your desktop from intrusion construct local-area networks (LANs) Welcome to the area of networking! Networking and the net contact our lives in untold methods on a daily basis. From connecting our desktops jointly at domestic and browsing the internet at excessive speeds to enhancing and sharing electronic track and video, computing device networking has turn into either ubiquitous and vital.   No adventure wanted! desktop Networking First-Step explains the fundamentals of desktop networking in easy-to-grasp language that each one folks can comprehend. This publication takes you on a guided travel of the center applied sciences that make up community and web site visitors. no matter if you're looking to take your first step right into a profession in networking or have an interest in precisely gaining a conversational wisdom of the expertise, this ebook is for you!  

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Before you put a letter in the mailbox, you put an address on the front. Likewise, before a computer can actually send a packet over the physical network, it must put an address in front of the packet. The address structure is defined by IP, as explained in RFC 791. The need for IP and for IP addresses is not that obvious in the network with just Fred and Wilma. However, Figure 3-7 makes the need for addressing a little more obvious. Figure 3-7. com). com. So that both Fred and Barney can see their web pages, the web server returns packets to both of them.

A protocol is like a standardin fact, in many ways, protocols and standards are the samebut the term protocol typically refers to a process. Figure 3-3 shows a simple protocol that might be used to recover the lost data. Figure 3-3. A Simple Protocol for Error Recovery A couple of changes were made to make this new protocol work. ) First, this protocol requires that the sender of the packet number the packets. That way, when the receiver (Fred) notices the error, he can send a message back to the sender (Wilma) asking her to send the specific problem packet againin this case, packet 2.

How TCP/IP Standards Grow As mentioned in the preceding section, the IETF manages the creation and approval of TCP/IP standards and protocols. The core TCP/IP protocol definitions are written in documents called Requests for Comments (RFCs). Each RFC defines some protocol or standard that is important to the TCP/IP model. The term "RFC" comes from the fact that anyone can comment on the protocol while it is being reviewed before it becomes a standard. In fact, the documents are posted on the Internet so that anyone can look at them and comment before they become an RFC.

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