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With the arrival of low-cost, high-speed solid-state microelectronics in the 1970s, it became possible to take significant steps forward in switching technology. One of the first innovative steps was packet switching. In packet switching, the message that was transmitted in its entirety over the earlier message-switched store-and-forward networks is now broken into smaller, more manageable pieces that are numbered by the Transport Layer before being passed into the network for routing and delivery. This innovation offers several advantages. First, it eliminates the need for the mechanical, switch-based hard drive, because the small packets can now be handled blindingly fast by solid-state memory. Second, should a packet arrive with errors, it and it alone can be discarded and replaced. In message-switched environments, an unrecoverable bit error resulted in the inevitable retransmission of the entire message not a particularly elegant solution. Packet switching, then, offers a number of distinct advantages. As before, of course, there are also disadvantages. There is no longer (necessarily) a physically or logically dedicated path from the source to the destination, which means that the ability to guarantee quality of service on an end-to-end basis is severely restricted. There are ways around this, as you will see in the section that follows, but they are often costly and always complex. This is one of the reasons that IP telephony had a difficult time achieving widespread deployment. It worked fine in controlled, relatively small corporate environments where traffic patterns could be scrutinized and throttled as required to maintain quality of service (QoS). In the public IP environment, however (read the Internet), there was no way to ensure that degree of control. Today, however, such concerns have been largely eliminated; we will discuss VoIP in greater detail in a later chapter. Packet switching can be implemented in two very different ways. We ll discuss them now.
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Capt. Lewis is brave, prudent, habituated to the woods, & familiar with Indian manners & character. He is not regularly educated, but he possesses a great mass of accurate observation on all the subjects of nature which present themselves here, & will therefore readily select those only
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in his new route which shall be new. He has qualified himself for those observations of longitude & latitude necessary to fix the line he will go over. Thomas Jefferson to Dr. Benjamin Rush of Philadelphia on why he picked Meriwether Lewis for the Corps of Discovery Six papers of ink powder; sets of pencils; Creyons, two hundred pounds of best rifle powder ; four hundred pounds of lead; 4 Groce fishing Hooks assorted; twenty-five axes; woolen overalls ad other clothing items, including 30 yds. Common flannel; one hundred flints; 30 Steels for striking or making fire; six large needles and six dozen large awls; three bushels of salt. Partial list of items purchased by Lewis for the trip
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When Meriwether Lewis and William Clark left St. Louis with the Corps of Discovery in 1803 to travel up the Missouri and Columbia Rivers to the Pacific Ocean, they had no idea how to get where they were going. They traveled with and relied on a massive collection of maps, instruments, transcripts of interviews with trappers and Native American guides, an awful lot of courage, and the knowledge of Sacagawea the wife of independent French-Canadian trader Toussaint Charbonneau, who accompanied them on their journey. As they made their way across the wilderness of the Northwest, they marked trees every few hundred feet by cutting away a large and highly visible swath of bark, a process known as blazing. By blazing their trail, others could easily follow them without the need for maps, trapper lore, or guides. They did not need to bring compasses, sextants, chronometers, or to hire local guides; they simply followed the well-marked trail. If you understand this concept, then you also understand the concept of connection-oriented switching, sometimes called virtual circuit switching, one of the two principal forms of switching technologies. When a device sends packets into a connection-oriented network, the first packet, often called a call setup packet or discovery packet, carries embedded in it the final destination address that it is searching for. Upon arrival at the first switch in the network, the switch examines the packet, looks at the destination address, and selects an outgoing port that will get the packet closer to its destination. It has the ability to do this because presumably, somewhere in the recent past, it has recorded the port of arrival of a packet from the destination machine, and concludes that if a packet arrived on that port from the destination host, then a good way to get closer to the destination is to go out the same port that the arriving
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