When files are transferred between a host and
问题详情
When files are transferred between a host and an FTP server, the data is divided into smaller pieces for transmission. As these pieces arrive at the destination host, they must be reassembled to reconstruct the original file. What provides for the reassembly of these pieces into the correct order？
A．The sequence number in the TCP header
B．The Start Frame. Delimiter in the 802.3 Preamble
C．The TTL in the IP header
D．The acknowledgement number in the segment header
E．The frame. check sequence in the Ethernet frame. trailer请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：A
解析：Explanation:TheTransportlayercanprovidereliablenetworkingviaacknowledgments,sequencing,andflowcontrol.AcknowledgmentsDeliveredsegmentsareacknowledgedtothesender.Iftheyarenotacknowledged,thesenderwillretransmit.SequencingDatasegmentsaresequencedintotheiroriginalorderwhentheyarriveatthedestination.FlowControlProvidesbuffercontrolsthatpreventpacketfloodingtothedestinationhost.Buffersstoreburstsofdataforprocessingwhenthetransmissioniscomplete.Layer4protocolsincludethefollowing:TransmissionControlProtocol(TCP)UserDatagramProtocol(UDP)SequencedPacketExchange(SPX)AreliablecommunicationsprotocolcreatedbyNovellNetWare
