Assume Host C is running a Web server on port 80. Assume that Hosts A and B are currently submitting requests to this Web server, which supports persistent connections. Is Host C using the same socket to send all of the requests? If they're being sent over different sockets, does each one have port 80? Discuss it and give an explanation.

Assume Host C is running a Web server on port 80. Assume that Hosts A and B are currently submitting requests to this Web server, which supports persistent connections. Is Host C using the same socket to send all of the requests? If they're being sent over different sockets, does each one have port 80? Discuss it and give an explanation.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Assume that our LastPass web server is configured to use port 7777 rather than the default HTTP port. Also assume that two users on the website, X and Y, are using their home computers to visit the web server at the same time. Are all of the requests from X’s computerand Y’s computer being sent to the same socket at the web server? If yes, how does the webserver distinguish the requests from different clients? If not, do the different sockets both have port 7777? Why? Assume that the LastPass web server uses persistent connections.
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Let's say Host C is a Web server that listens on port 80. Assume that this web server allows persistent connections and that it accepts requests from hosts A and B. Is Host C using the same socket to transmit each request? If they're broadcast over different sockets, do they both have port 80? You should talk about it and provide an explanation.
Write a Java program to create a TCP Socket program to receive an input message from client socket, reverse the input message and send it back to the client. Note that the program should have the comments embedded in it to explicitly explain why that code is being used. Explain in detail the client process and the server process with reference to the code given by you for this task.
- Consider another carelessly written Web application, which uses a servlet that checks if there was an active session, but does not check if the user is authorized to access that page, instead depending on the fact that a link to the page is shown only to authorized users. What is the risk with this scheme? (There was a real instance where applicants to a college admissions site could, after logging into the Web site, exploit this loophole and view information they were not authorized to see; the unauthorized access was however detected, and those who accessed the information were punished by being denied admission.)
Port 80 is open on Host C, and a Web server is accessible via it. Suppose A and B are in charge of managing the website's server infrastructure. Is the same Host C socket used for all requests? All sockets with port 807 use the server's persistent connections and the requests are routed via two different sockets. Talk about and defend your position.
Assume Host C is the owner of a Web server that can be accessed via port 80. Assume that A and B are the concerned web hosts. Is the same Host C socket used to forward each and every request? All of the sockets will utilize port 807 by default if the server employs persistent connections and requests are split across two different sockets. How about a discussion and an argument?
A TCP endpoint can abort the connection, which entails the sending of a RST Packet rather than a FIN. The endpoint then moves directly to TIMEWAIT. To abort a connection using the Berkeley socket library, one first sets the SOLLINGER socket option, with a linger time of 0. At this point an application close() triggers an abort as above, rather than the sending of a FIN.
Assume Host C is running a Web server on port 80. Assume that Hosts A and B are currently submitting requests to this Web server, which supports persistent connections. Is Host C using the same socket to send all of the requests? If they're being sent over different sockets, does each one have port 80? Discuss it and give an explanation.
Write a Java UDP socket program that would send a simple “Hello World” message to are ceiver using DatagramSocket and DatagramPacket. You have to write only the sender program and assume that the receiver program runs in the same system.
- Consider another carelessly written Web application, which uses a servlet that checks if there was an active session, but does not check if the user is authorized to access that page, instead depending on the fact that a link to the page is shown only to authorized users. What is the risk with this scheme? (There was a real instance where applicants to a college admissions site could, after logging into the Web site, exploit this loophole and view information they were not authorized to see; the unauthorized access was however detected, and those who accessed the information were punished by being denied admission.)
We have looked at various settings for HTTP delays. Now, compare parallel downloads with non persistent HTTP versus persistent HTTP. Assuming you are downloading a web page that has N reference objects from a server which is located in a city called Seta. Will the distance to the Seta city from where you are , make a difference which HTTP connection is used? Set your scenario (such as speed of the link, size of the objects and N) and explain your answer