ccna第一本书第四章.docVIP

ENetwork Chapter 4 1. Based on the transport layer header shown in the diagram, which of the following statements describe the established session? (Choose two.) This is a UDP header. This contains a Telnet request. This contains a TFTP data transfer. The return packet from this remote host will have an Acknowledgement Number of 43693. This is a TCP header. Option 2 and Option 5 are correct. 2. With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications? 0 to 255 256 to 1022 0 to 1023 1024 to 2047 49153 to 65535 2 points for Option 3 3. Why are port numbers included in the TCP header of a segment? to indicate the correct router interface that should be used to forward a segment to identify which switch ports should receive or forward the segment to determine which Layer 3 protocol should be used to encapsulate the data to enable a receiving host to forward the data to the appropriate application to allow the receiving host to assemble the packet in the proper order 2 points for Option 4 4. Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately? application presentation session transport network 2 points for Option 4 5. Refer to the exhibit. Host A is using FTP to download a large file from Server 1. During the download process, Server 1 does not receive an acknowledgment from Host A for several bytes of transferred data. What action will Server 1 take as a result? create a Layer 1 jam signal reach a timeout and resend the data that needs to be acknowledged send a RESET bit to the host change the window size in the Layer 4 header 2 points for Option 2 6. Why is flow control used for TCP data transfer? to synchronize equipment speed for sent data to synchronize and order sequence numbers so data is sent in complete numerical order to prevent the receiver from being overwhelmed by