ccna 200 301 booksmart trailer can i cannot hear

ccna 200 301 booksmart trailer can i cannot hear.When a host wants to send data into the network, it first checks to see if there is a digital signal on the current line. If the line is completely idle, meaning that there is no load on the current line (no other host is transmitting data), then this host starts its data transmission behavior. But it doesn't end here. This host that is transferring data will continuously monitor the line to make sure that no other hosts start transferring data in the meantime. If it detects another signal on the line, it sends out an extended congestion signal, which causes all devices in the segment to stop sending data (as if they were busy). All devices respond to the congestion signal by waiting for a period of time before starting to try to send data again. The host experiencing the conflict will use the Backoff algorithm to determine when to retransmit. If the conflict persists after 15 attempts, the device trying to transmit will time out. The line is finally idle!Chapter 3 Ethernet TechnologyCarrier Supervisory Multiple Access with Conflict Detection (CSMA/CD) Figure 3.1 CSMA/CDWhen a conflict occurs in an Ethernet local area network (LAN), the following events occur. 1. a conflict signal notifies all devices that a conflict is now occurring. 2. the conflict triggers a random fallback algorithm. 3. All devices in this Ethernet segment stop transmitting until their fallback timers time out.4. After the timer times out, all hosts transmit data with the same priority. The persistent phenomenon of severe conflict in CSMA/CD networks has the following effects: . Low Throughput of Delayed FunctionCongestion.The fallback phenomenon in an Ethernet network is actually retransmission delay, which occurs forcibly when a conflict occurs. When a conflict occurs, the host will transmit again after this forced wait time has timed out. After the receding delay cycle times out, all hosts transmit data with the same priority.In the next subsections, I will cover Ethernet in more detail, which involves the data link layer (Layer 2) and the physical layer (Layer 1).3.1.4 Half-duplex and full-duplex EthernetHalf-duplex Ethernet was defined in the original IEEE 802.3 Ethernet definition. Cisco considers half-duplex to be the use of only one wire pair to enable bi-directional digital signal transmission in the line. The positive EE definition of half-duplex is slightly different, but Cisco's definition illustrates the common sense of how Ethernet works.