只写答案而没有解释说明.pdf

只寫答案而沒有解釋說明 扣一半分數只寫答案而沒有解釋說明 扣一半分數 1 a What is the multimedia mail extension MIME 4 b What values are used by TCP and UDP to identify their sockets 6 c Describe four operations to provide reliable data transfer over channels with errors and loss 8 d Why is there a TCP seven answers 7 e Explain how TCP Fast Retransmit works 4 f How TCP does its flow control 4 2 Draw the flow of the TCP three way handshake to explain its operations Suppose the initial sequence numbers of the client and the server are 199 and 99 respectively 必須在圖上分別清楚標示出 TCP 必要的 flag sequence number and ACK number 8 3 Consider the TCP procedure for estimating RTT 11 1 nnn TTEstimatedRSampleRTTTTEstimatedR What type is this equation 3 Why TCP uses this function 3 4 List and compare two pipelined transport protocols 16 5 Explain flows and purposes of HTTP cookie and web caching 要寫 出用處 畫出運作過程 5 each 10 total 6 a What three services are provided by the domain name system 3 b Explain iterated query and recursive query 6 7 a 請畫出TCP socket連線建立時client and server兩端呼叫函式的 流程 名稱與順序要正確 10 b 你所交的 Winsock 程式作業的四個功能選項是什麼 8 只寫答案而沒有解釋說明 扣一半分數只寫答案而沒有解釋說明 扣一半分數 1 a MIME multimedia mail extension additional lines in mail message header declare MIME content type for multimedia objects in a mail 4 b UDP socket identified by two tuple dest IP address dest port number 2 TCP socket identified by 4 tuple 4 source IP address source port number dest IP address dest port number c sender adds sequence number to each pkt to detect duplicate pkts 2 receiver uses checksum to detect bit errors 2 receiver sends ACK with seq of last pkt received OK 2 sender waits reasonable amount of time for ACK retransmits if no ACK received in this time 2 d 7 point to point reliable in order byte steam pipelined TCP congestion and flow control set window size send Server socket