Wide Area Network Technologies in Software

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data packet to Router 4 Router 4 has since determined that Router 2 is offline and sends the data packet to Router 1 Router 1 sends the data packet to PC A The fourth data packet is sent to Router 6, on to Router 3, then to Router 1, and finally is delivered to PC A Let s look more closely at packets 3 and 4: While packet 3 was detained at Router 5 because of the failure of Router 2, packet 4 was able to be delivered to PC A before the arrival of packet 3 This shows that a packet-switched network does not depend on packets being delivered in the order in which they were sent Actually, if there are enough data paths, it is very common for packets to be received out of order With routable protocols, data packets are numbered so they can be placed back in the proper order to create the original block of data that existed at the sending PC It would be counterproductive to receive a jumbled database or an unreadable document Data packets are sent out of order on the Internet constantly The only time this presents a problem is when the data being sent is streaming voice or video If you have ever tried Packet switching is the to use the Internet as a medium for making process of breaking a transmission down telephone calls, you know that the sound quality into multiple packets, each potentially is not very good on slow network links, such as a taking a different route to the destination 56 Kbps modem networkThe packets can be received There are a number of packet-switched out of order and are assembled at the network technologies; a few examples of WAN destination technologies that employ packet-switched networks are Asynchronous Transfer Mode (ATM) and Frame Relay
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Circuit switching, on the other hand, is the foundation for the telephone system, but it is also widely used for data communications When you make a telephone call from your home to someone next door or even 1000 miles away, a circuit is opened between your telephone and the telephone to which you are calling The circuit is a dedicated pathway used by the communication and is not usable by others, so it is 100 percent dedicated for your use As you speak, your voice is sent over the media to the other telephone and is not broken up or rerouted Generally speaking, circuit switching is less efficient than packet switching in that the bandwidth is consumed whether or not there is data to transmit; however, this allows service providers to offer customers a guaranteed bandwidth
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One of the major problems with circuit switching occurs when a circuit fails the circuit is a permanent path, and there is no redirection of data through another path unless a new circuit is created For example, if you are speaking with someone on the phone and Know the differences the line you re using was brought down by a between packet-switching and circuitfallen tree, your circuit will be broken and the switching networks In addition, remember line will go dead You will have to hang up and that data networks are usually packetplace the call again When you place the call switched, whereas telephone connections again, a different circuit will be established and are normally circuit-switched you will use that circuit for the duration of the communication
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exerCise 9-1 Packet-switching network exercise
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In this exercise, you are given a scenario and a network diagram to determine the path of a data packet Your company has a headquarters and ten remote offices All of the offices are connected by a packet-switching network to create a WAN Look at Figure 9-2, and then answer the following questions PC A is at the main headquarters, and PC B is at one of the remote offices Each router in the diagram designates an office You are sending data from PC A to PC B, and you want to try to determine the path the data will take on its route Using a diagnostic utility, you determine that all of the even-numbered routers are extremely busy and are sending slow transmissions from the local LAN and remote LANs 1 What is the path that data packets could take from PC A to PC B 2 Is it possible that the data packets could arrive out of order 3 What are some reasons why Router 1 might be preferred over Router 3 4 What path would be used if the odd-numbered routers were offline or busy, and the even-numbered routers were online and not busy 5 What would occur if Routers 1, 2, and 3 were to become extremely busy or go offline
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