Connecting Networks: Network Lingo in Software

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Connecting Networks: Network Lingo
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Networking protocols are the languages that network systems and applications use when interacting and transferring data
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What we re about to do in this section is downright evil We re going to try to explain how the Internet works, from the most basic level And we re going to do this in just a few pages, which is a most dastardly and nefarious thing to do Each paragraph here is covered extensively in books that are hundreds of pages long We ve boiled these concepts down to the bone Actually, past the bone You re looking at marrow soup here Why did we do this Because it helps to have a basic idea of what s going on in those wires Beyond the basics, we couldn t even begin to get into any of these concepts without creating a book that would give you a hernia to carry And frankly, our medical liability coverage isn t that great If you already fully understand TCP/IP networking, then feel free to gloss down to the Security Considerations and Best Practices sections
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Copyright 2004 by J a s on Alba ne s e a nd We s S onne nre ich Click He re for Te rms of Us e
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200 Network Security Illustrated
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What people think: Core networking protocols are like Greek to me I just want to download a file from the Internet What we think: Understanding the protocols that make networking possible empowers the average user to make better decisions about data
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Ethernet
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Many different technologies are available for creating networks One of the most popular and flexible is called Ethernet It is a basic system that moves information between two networked computers Each computer has a network adapter (it looks like a telephone jack on the back of a PC or laptop, only it is larger) This adapter has a unique Ethernet hardware address, which is a fairly large number Theoretically, every Ethernet adapter in the universe has a different hardware address The hardware address comes from a chip located on the Ethernet card Information travels across an Ethernet network in packets, or frames, which are small parcels of Encapsulation data Each parcel has a from and to hardware address, followed by A packet generally has two fundamensome data to transmit Packets are tal parts: a header and data The header usually small; the data in a Web page contains the from and to addresses, and might get spread across many some additional information that helps packets when moving the packet around the network The data can contain anyEthernet is nothing more than a thing, including another packet Think basic delivery system Think of it as a of a packet as a Russian doll The mail tube Put the letter in and hope header is the artwork on the outside it gets to where it s going The tube The data is the doll shell When you itself will not guarantee that the inopen up one shell, another smaller doll formation will arrive at its destinais inside That smaller doll can contain tion Ethernet itself does nothing to an even smaller one and so on direct information from one network Encapsulation is the process of putting to another What Ethernet actually a packet of one type inside another does is pretty basic It is known as a link layer technology, because it An IP packet sent over Ethernet is deals directly with the hardware that actually encapsulated inside the links machines together Ethernet packet So, when you open up the data part of an Ethernet packet, you ll find an IP packet, which The Internet Protocol (IP) has a header and its own data As you ll This is the fundamental technology soon see, the data part of the IP packet behind the Internet One of the main can be opened up as well purposes of Internet Protocol (IP) is to create a hardware-independent
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Part VI Connecting Networks 201 system for moving data from one machine to another Like Ethernet, IP data is also sent in packets with from and to addresses IP has a separate addressing system from Ethernet, one that is hierarchical in nature Although IP data is commonly sent across Ethernet networks, it can operate with many other types of link layer systems
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