Suppose that a Web server runs in Host C on port 80 . Suppose also that this Web server uses persistent connections, and is currently receiving requests from two different Hosts, A and B. a) Are all of the requests being sent to the same port number at Host C? b) Will the client use port 80 in its local machine to communicate with the server? c) How does the server differentiate between the two requests?

Suppose that a Web server runs in Host C on port 80 . Suppose also that this Web server uses persistent connections, and is currently receiving requests from two different Hosts, A and B. a) Are all of the requests being sent to the same port number at Host C? b) Will the client use port 80 in its local machine to communicate with the server? c) How does the server differentiate between the two requests?

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter13: Internet And Distributed Application Services

Section: Chapter Questions

Problem 15VE

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Suppose that a Web server runs in Host C on port 80. Suppose this Web server uses persistent connections, and is currently receiving requests from two different Hosts, A and B. Are all of the requests being sent through the same socket at Host C? If they are being passed through different sockets, do both of the sockets have port 80? Discuss and explain.
Assume Client A starts a Telnet connection with Server S. Client B starts a Telnet connection with Server S about the same time. If A and B are distinct hosts, is it conceivable that the source port number in the segments from A to S is the same as the source port number in the segments from B to S?
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A connection that connects two hosts may transport many packets at the same time. Please provide a schedule that outlines all of the actions that need to be completed in order to successfully execute one shipment. Is it to be anticipated that one of the delays will take a certain amount of time, while the duration of the other delay may be adjusted in accordance with the circumstances?
Consider a client connecting to a web server via a router as shown in Fig.Q2. Client A sends a request to the server to retrieve a 7.5 Mbytes file. Given that the segment size is 50 Kbytes, the round trip time (RTT) between the server and client is 10 ms, the initial slow-start threshold is 16 and the client's buffer always has a storage space of 1 Mbytes. Assume that TCP Reno is used, there is no loss during transmission and the headers of protocols are ignored. 400 Mbps 200 Mbps 400 Mbps Link a Link b Link c Client Web Server Fig.Q2 (a) Describe how the value of sending window changes as a function of time (in units of RTT) during the whole connection time. 2.
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Consider a simple UDP-based protocol for requesting files (based somewhat loosely on the Trivial File Transport Protocol, or TFTP). The client sends an initial file request, and the server answers (if the file can be sent) with the first data packet. Client and server then continue with a stop-and-wait transmission mechanism. (a) Describe a scenario by which a client might request one file but get another; you may allow the client application to exit abruptly and be restarted with the same port. (b) Propose a change in the protocol that will make this situation much less likely.
A connection that connects two hosts may transport many packets at the same time. Please provide a schedule that outlines all of the actions that need to be completed in order to successfully execute one shipment. Is it anticipated that one delay would take a certain amount of time, whilst the duration of the other delay will be subject to change depending on the circumstances?
A connection that connects two hosts may transport many packets at the same time. Please provide a schedule that outlines all of the actions that need to be completed in order to successfully execute one shipment. Is it to be anticipated that one of the delays will take a certain amount of time, while the duration of the other delay may be adjusted in accordance with the circumstances?
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