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Hw2 hint PowerPoint Presentation

Hw2 hint

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Hw2 hint

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  1. Hw2hint ComputerNetwork 教授:張宏慶 助教:黃麒瑋

  2. P.01 • A.to communicate two host must connect them then can transmit data • B.recall contents of lab1 • C.socket is :http://zh.wikipedia.org/wiki/Socket_A • D.any communication must meet data loss problem sometimes,then cultivate parity bit technique • E.while deciding which type of packet to send for an application , there are two mainly packet type:TCP & UDP

  3. P.04 • A.See “Host:”&”GET” • B.See “HTTP” • C.See “Connetction:” • D.See if there any information in this message • E.See “User-Agent”

  4. P.05 • A.See the first line of the message • B.See “last:modified” • C.See “Content Length” • D.See the 8thline,and “Connection”

  5. P.07&P.08 • Refer to course slide

  6. P.09 • A.Theaverage time is the average size of the object divided by transmission rate. • B.to sum up hit time and miss time

  7. P.10 • Note that each downloaded object can be completely put into one data packet. • First consider parallel downloads via non-persistent connections. • Then consider persistent HTTP connection.

  8. P.18 • A.Google it • B to E : do as question • F.consider internet security

  9. P.22 • Consider:Dcs= max {NF/us, F/dmin} • And:

  10. P.23 • A.Refer to section2.6 and prove it • B. Refer to section2.6 and prove it • C.Refer to section2.6 and prove it(consider using suppose skill)

  11. p.24 • Similar to p.23 by letting u = u1+u2+u3+…+un

  12. p.32 • In original , there is not specify a special port in the program • ,but there is still a port for it to run,ant after adding this line , the port will be changed. • The original port is 80 port.