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Cyclic Redundancy Check (CRC) (4 bytes): As discussed in section 52, the purpose of the CRC field is to allow the receiving adapter, adapter B, to detect whether any errors have been introduced into the frame, ie, if bits in the frame have been toggled Causes of bit errors include attenuation in signal strength and ambient electromagnetic energy that leaks into the Ethernet cables and interface cards Error detection is performed as follows When host A constructs the Ethernet frame, it calculates a CRC field, which is obtained from a mapping of the other bits in frame (except for the preamble bits) When host B receives the frame, it applies the same mapping to the frame and checks to see if the result of the mapping is equal to what is in the CRC field This operation at the receiving host is called the CRC check If the CRC check fails (that is, if the result of the mapping does not equal the contents of the CRC field), then host B knows that there is an error in the frame Preamble: (8 bytes) The Ethernet frame begins with an eight-byte preamble field Each of the first seven bytes of the preamble is 10101010; the last byte is 10101011 The first seven bytes of the preamble serve to "wake up" the receiving adapters and to synchronize their clocks to that of the sender's clock Why should the clocks be out of synchronization Keep in mind that adapter A aims to transmit the frame at 10 Mbps, 100 Mbps or 1 Gbps, depending on the type of Ethernet LAN However, because nothing is absolutely perfect, adapter A will not transmit the frame at exactly the target rate; there will always be some drift from the target rate, a drift which is not known a priori by the other adapters on the LAN A receiving adapter can lock onto adapter A's clock by simply locking onto the bits in the first seven bytes of the preamble The last two bits of the eighth byte of the preamble (the first two consecutive 1s) alert adapter B that the "important stuff" is about to come When host B sees the two consecutive 1s, it know that the next six bytes is the destination address An adapter can tell when a frame ends by simply detecting absence of current.

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An Unreliable Connectionless Service All of the Ethernet technologies provide connectionless service to the network layer That is to say, when adapter A wants to send a datagram to adapter B, adapter A encapsulates the datagram in an Ethernet frame and sends the frame into the LAN, without first "handshaking" with adapter B This layer-2 connectionless service is analogous to IP's layer-3 datagram service and UDP's layer-4 connectionless service All the Ethernet technologies provide an unreliable service to the network layer In particular when adapter B receives a frame from A, adapter B does not send an acknowledgment when a frame passes the CRC check (nor does it send a negative acknowledgment when a frame fails the CRC check) Adapter A hasn't the slightest idea whether a frame arrived correctly or incorrectly When a frame fails the CRC check, adapter B simply discards the frame This lack of reliable transport (at the link layer) helps to make Ethernet simple and cheap But it also means that the stream of datagrams passed to the network layer can have gaps If there are gaps due to discarded Ethernet frames, does the application-layer protocol at host B see gaps as well As we learned in 3, this solely depends on whether the application is using UDP or

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What goes round comes round. Whatever you give out has a habit of coming back to you in some way or another. Confident people act from a position of generosity and abundance. They give what they can, when they can whether it s their time, talent, money, energy, or love. Aim to give to others and remember to give to yourself too. Generous thoughts nurture your mind and attract generous people to you.

file:///D|/Downloads/Livros/computa o/Computer%20Net%20Approach%20Featuring%20the%20Internet/ethernethtm (4 of 12)20/11/2004 15:52:37

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TCP If the application is using UDP, then the application-layer protocol in host B will indeed suffer from gaps in the data On the other hand, if the application is using TCP, then TCP in host B will not acknowledge the discarded data, causing TCP in host A to retransmit Note that when TCP retransmits data, Ethernet retransmits the data as well But we should keep in mind that Ethernet doesn't know that it is retransmitting Ethernet thinks it is receiving a brand new datagram with brand new data, even though this datagram contains data that has already been transmitted at least once Baseband Transmission and Manchester Encoding Ethernet uses baseband transmission, that is, the adapter sends a digital signal directly into the broadcast channel The interface card does not shift the signal into another frequency band, as do ADSL and cable modem systems Ethernet also uses Manchester encoding, as shown in Figure 55-3 With Manchester encoding each bit contains a transition; a 1 has a transition from up to down, whereas a zero has a transition from down to up The reason for Manchester encoding is that the clocks in the sending and receiving adapters are not perfectly synchronized By including a transition in the middle of each bit, the receiving host can synchronize its clock to that of the sending host Once the receiving adapter's clock is synchronized, the receiver can delineate each bit and determine whether it is a one or zero Manchester encoding is a physical layer operation rather than a link-layer operation; however, we have briefly described it here as it is used extensively in Ethernet

Nodes in an Ethernet LAN are interconnected by a broadcast channel, so that when an adapter transmits a frame, all the adapters on the LAN receive the frame As we discussed in section 53, Ethernet uses a CSMA/CD multiple access algorithm Summarizing our discussion from Section 53, recall that CSMA/ CD employs the following mechanisms:

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