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901 902 903 904 Packet-Switching vs Circuit-Switching Networks Asynchronous Transfer Mode Synchronous Optical Network/Synchronous Digital Hierarchy Optical Carrier Level-X 905 906 907 908 X25 and Frame Relay Fiber Distributed Data Interface (FDDI) Tx/Ex-Carriers Internet Access Technologies Two-Minute Drill Self Test
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ith companies becoming larger and more geographically diverse, wide area networks (WANs) have become increasingly the norm for networks these days Connecting two different LANs found at different locations within a company is a typical scenario for a WAN environment For example, Company ABC may have two locations; one is New York and the other in Boston The company wants the two locations to be able to communicate with one another without using the InternetYou, as the network administrator, will need to choose a WAN technology that connects these two LANs together, basing your decision on the performance and the cost of the technology This chapter identifies some of the popular technologies that are used in WAN environments be sure to be familiar with them for the Network+ exam Also note that organizations may connect their different offices together using RAS or ISDN technologies as discussed in 8 be sure to review those for the exam as well
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This section introduces the concepts of packet-switching networking and circuitswitching networking technologies Be sure to know these two terms for the Network+ exam
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Packet switching
Packet switching is used by the Internet and routed networks The path that is used to send data packets from one point to another through routers is not predetermined, meaning that each packet can take a different pathway to the destination Packetswitched networks are efficient in that they consume bandwidth only when there is something to send If you look at the routed network in Figure 9-1, you can see that from point A to point B there exist many paths for packets to travel
Packet-Switching vs Circuit-Switching Networks
figure 9-1
A routed network
When a user at PC A wants to copy a shared file from PC B, the data path is not a set path between specific routers Packets are sent from router to router by the quickest or shortest path If a router is extremely busy, it will not be used, and a different path will be chosen if one exists Remember that other users are also sending data packets over the same media and routers Referring to Figure 9-1, let s now look at an example of how packet switching works PC B sends its data to the router that is the least busy For the first data packet, let us assume that it is Router 6 Now that Router 6 has the data packet, it looks at its routing table and determines that Router 3 might be the best way for it to reach PC A Router 6 sends the data packet to Router 3, which in turn decides that the best path is to forward the packet on to Router 1 Router 1 then sends the packet to PC A Now, the second packet might be sent to Router 7, because Router 6 has suddenly become very busy Router 7 receives the data packet and forwards it to Router 4 Router 4 sends the packet to Router 2 Router 2 checks its routing table and sends the packet on to PC A PC A then starts assembling the entire data file from the packets received For the third data packet, let s say that it is also sent to Router 7, which sends it to Router 5 again Now let s say that Router 2 has suddenly gone offline Router 5 waits to contact Router 2, but eventually it is timed out and sends the data packet back to Router 7, which then tries to send the
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