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ccna 200 301 bookstore movers dc.The information of the recipient is also synchronized here, so that a two-way connection can be established.The last part of the spirit is also an acknowledgement. It informs the destination host that the connection agreement has been accepted and that the actual connectionhas been established. Now the data transfer can start.This process seems simple enough, but in reality things do not always go so smoothly. Sometimes congestion occurs during a transmission, either because a high rate computer generates a data stream faster than the network can handle the transmission, because many computers are sending data through a gateway at the same time, or because of network congestion caused by the destination. In the latter case, congestion at the gateway or destination is not even related to the source. In either case, the essential problem is similar to a road bottleneck - too much traffic and too little capacity. Usually this is not a problem triggered by one vehicle, but by too many vehicles on the road.So, what happens when a device receives more data than it can handle? It puts the data it can't process temporarily into a memory space called a Buffer. But cache space can only handle small bursts of data. If the amount of data is very large and the flow of data is continuous, the device will eventually run out of memory space, the burst capacity will be filled up, and eventually the device will discard all subsequent packets received.But you don't have to worry too much. Because of the features provided by the transport protocol, the network flow control system works very well. To avoid "dumping" large amounts of data and causing data loss, the transport protocol can send a "NotReady" indication to the sender (or source device) of the stream, as detailed in Figure 2.10. This mechanism works like a red light, telling the sender device to to stop transmitting data segments to an overloaded receiver device. When the peer receiving device finishes processing the data segments in the cache, it issues a transmission indication that it is "ready". When the device waiting to continue sending the rest of the data receives this "ready" indication, it begins to continue transmission.Basically, when using a reliable, connection-oriented data transfer protocol, the receiving device receives data messages in the exact same order as the sending device sends them - if the order is disturbed, the transfer fails! If a data segment is lost, duplicated, or corrupted during transmission, the transmission fails. This problem is solved by the following mechanism: the receiving device needs to confirm that it received each data segment.We call it a connection-oriented service if it has the following characteristics.A virtual link is established by the suffix (e.g., three handshakes).The whole use of the sequence mechanism.