Suppose within your Web browser you click on a link to obtai.pdf
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Suppose within your Web browser you click on a link to obtain a Web page. The IP address for the associated URL is not cached in your local host. Ignore the delay caused by DNS look-up. Further suppose the base HTML file references 4 other very small objects on the same server. Let RTT denote the round-trip time between the local host and the server containing the objects. Using the non-persistent HTTP (with no parallel TCP connections) and neglecting the file/object transmission times, how much time elapses from when a client requests the base HTML file until the entire web page (all web objects) is received by the client? Group of answer choices 3 RTT 5 RTT 8 RTT 10 RTT 4 RTT Flag question: Question 11 Question 111.5 pts Referring to the previous question, neglecting the file/object transmission times, what's the minimum amount of time required to retrieve the HTML file and its 4 referenced small objects with persistent HTTP? Group of answer choices 6 RTT 5 RTT 4 RTT 3 RTT 2 RTT.
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CSE422 Section 002 – Computer Networking Fall 2018 Ho.docx
CSE422 Section 002 – Computer Networking
Fall 2018
Homework 2 – 50 points
Sockets (10 points)
1. For a client-server application over TCP, why must the server program be executed before the
client program?
2. For a client-server application over UDP, why may the client program be executed before the
server program?
3. The UDP server shown in the course slides needed only one socket, whereas the TCP server
needed two sockets. Why?
4. If the TCP server were to support N simultaneous connections, each from a different client host,
how may sockets would the TCP server need?
5. You are creating an event logging service that will be handling event messages from multiple
remote clients. This service can suffer delays in message delivery and even the loss of some
event messages. Would you implement this using TCP or UDP? Why?
The HTTP GET message (10 Points)
Consider the figure below, where a client is sending an HTTP GET message to a web server,
gaia.cs.umass.edu.
Suppose the client-to-server HTTP GET message is the following:
GET /kurose_ross/interactive/quotation1.htm HTTP/1.1
Host: gaia.cs.umass.edu
Accept: text/plain, text/html, image/gif, image/jpeg, audio/basic,
audio/vnf.wave, video/mp4, video/wmv, application/*, */*
Accept-Language: en-us, en-gb;q=0.5, en;q=0.1, fr, fr-ch, zh, cs
If-Modified-Since: Wed, 10 Jan 2018 13:13:03 -0800
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML,
like Gecko) Chrome/17.0.963.56 Safari/535.11
Answer the following questions:
1. What is the name of the file that is being retrieved in this GET message?
2. What version of HTTP is the client running?
CSE422 Section 002 – Computer Networking
Fall 2018
3. What formats of text, images, audio, and video does the client browser prefer to receive?
[Note: for this and the following questions on browser media and language preferences, you
will need to do a bit of additional reading on the Web. Here is a good place to start.]
4. What do the strings "application/*" and "*/*" signify in the Accept: header?
5. What languages is the browser indicating that it is willing to accept? [Note: you can look at
your own browser preferences to get a listing of language codes.]
6. What is the meaning of the "relative quality factor," q, associated with the various version of
English? [Note: Here is a good place to start. See also [RFC 2616].]
7. What is the client's preferred version of English? What is the browser's least preferred
version of English?
8. Does the browser sending the HTTP message prefer Swiss French over traditional French?
Explain.
9. Does the client already have a (possibly out-of-date) copy of the requested file? Explain. If
so, approximately how long ago did the client receive the file, assuming the GET request has
just been issued?
10. What is the type of client browser and the client's operating system? [Note: To answer this,
you'll need to understan.
Suppose you use your Web browser to access a web page- The IP address.pdf
Suppose you use your Web browser to access a web page. The IP address for the associated URL
is not cached in your local host, so a DNS lookup is necessary. Suppose that n DNS servers are
visited before your host receives the IP address from DNS; the successive visits incur an RTT of
RTT1, . . . , RTTn. Further suppose that the Web page associated with the link references ten
additional small objects on the same server. Let RTT0 denote the RTT between the local host
and the server containing the web page. Assuming zero transmission time for all the objects.
How much time elapses from when you click on the link until your browser receives all the
objects with the following three situations? (1) Non-persistent HTTP with no parallel TCP
connections? (2) Non-persistent HTTP with the browser configured for 4 parallel connections?
(3) Persistent HTTP?.
Suppose within your Web browser you click on a link to obtain a Web p.pdf
Suppose within your Web browser you click on a link to obtain a Web page. The IP address for
the web server where the web page is hosted is not cached in your local host, so a DNS lookup is
necessary to obtain the IP address. Suppose that n DNS servers are visited before your host
receives the IP address from DNS; visiting each DNS server an RTT of D. Furthermore, suppose
that the Web page associated with the URL contains m objects. Let RTT 0 denote the RTT
between the local host and the server for each object (including base-HTML file). Assume all
objects are of the same size of L bits (including base-HTML file) and the transmission rate is C.
It is required to compute the total delay from when the client clicks on the link until the client
receives all the objects for each of the following scenarios: (a) (3 Points) Non-persistent HTTP
without parallel TCP connections. (b) (3 Points) Persistent HTTP without pipelining, i.e.
requesting one object, receiving it, then requesting the next one, and so on. Hint: The browser
needs to obtain first the IP of web server. This time is fixed and does not depend on the HTTP
protocol..
4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx
4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptxv4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.ppt
HTTP & HTML & Web
Overview of HTTP, HTML, WWW and web technologies.
The combo HTTP and HTML is the foundation of the World Wide Web (WWW).
HTML (HyperText Markup Language) defines a text-based format for describing the contents of a web page. HTML is based on tags similar to XML (eXtensible Markup Language), but its definition is less strict.
HTML pages are transported with the HTTP protocol (HyperText Transmission Protocol) over TCP/IP based networks.
The power of the WWW comes with the links based on URLs (Uniform Resource Locators) that connect pages to form a web of content.
Browsers display links as clickable items that, when clicked, trigger the browser to load the web page pointed to by the link.
This statelessness contributed a lot to the stability and scalability of the world wide web where web servers are only tasked with the delivery of web pages while the browser is responsible for the rendering of web pages.
The static nature of the early World Wide Web was soon augmented with the dynamic creation of web pages by web servers or by enriching static web pages with dynamic content.
Technologies like CGI (Common Gateway Interface), JSP (Java Server Pages) or ASP (Active Server Pages) were developed to provide the infrastructure to build dynamic web applications.
These server-side technologies were complemented with client-side technologies like Javascript and AJAX (Asynchronous Javascript And XML).
Web page caching is an important mechanism to reduce latency in loading web pages and reducing network traffic.
HTTP defines different caching control mechanisms. Simpler caching methods are based on web page expiry dates while more complex mechanisms use web page validation.
Recommended
CSE422 Section 002 – Computer Networking Fall 2018 Ho.docx
CSE422 Section 002 – Computer Networking
Fall 2018
Homework 2 – 50 points
Sockets (10 points)
1. For a client-server application over TCP, why must the server program be executed before the
client program?
2. For a client-server application over UDP, why may the client program be executed before the
server program?
3. The UDP server shown in the course slides needed only one socket, whereas the TCP server
needed two sockets. Why?
4. If the TCP server were to support N simultaneous connections, each from a different client host,
how may sockets would the TCP server need?
5. You are creating an event logging service that will be handling event messages from multiple
remote clients. This service can suffer delays in message delivery and even the loss of some
event messages. Would you implement this using TCP or UDP? Why?
The HTTP GET message (10 Points)
Consider the figure below, where a client is sending an HTTP GET message to a web server,
gaia.cs.umass.edu.
Suppose the client-to-server HTTP GET message is the following:
GET /kurose_ross/interactive/quotation1.htm HTTP/1.1
Host: gaia.cs.umass.edu
Accept: text/plain, text/html, image/gif, image/jpeg, audio/basic,
audio/vnf.wave, video/mp4, video/wmv, application/*, */*
Accept-Language: en-us, en-gb;q=0.5, en;q=0.1, fr, fr-ch, zh, cs
If-Modified-Since: Wed, 10 Jan 2018 13:13:03 -0800
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.11 (KHTML,
like Gecko) Chrome/17.0.963.56 Safari/535.11
Answer the following questions:
1. What is the name of the file that is being retrieved in this GET message?
2. What version of HTTP is the client running?
CSE422 Section 002 – Computer Networking
Fall 2018
3. What formats of text, images, audio, and video does the client browser prefer to receive?
[Note: for this and the following questions on browser media and language preferences, you
will need to do a bit of additional reading on the Web. Here is a good place to start.]
4. What do the strings "application/*" and "*/*" signify in the Accept: header?
5. What languages is the browser indicating that it is willing to accept? [Note: you can look at
your own browser preferences to get a listing of language codes.]
6. What is the meaning of the "relative quality factor," q, associated with the various version of
English? [Note: Here is a good place to start. See also [RFC 2616].]
7. What is the client's preferred version of English? What is the browser's least preferred
version of English?
8. Does the browser sending the HTTP message prefer Swiss French over traditional French?
Explain.
9. Does the client already have a (possibly out-of-date) copy of the requested file? Explain. If
so, approximately how long ago did the client receive the file, assuming the GET request has
just been issued?
10. What is the type of client browser and the client's operating system? [Note: To answer this,
you'll need to understan.
Suppose you use your Web browser to access a web page- The IP address.pdf
Suppose you use your Web browser to access a web page. The IP address for the associated URL
is not cached in your local host, so a DNS lookup is necessary. Suppose that n DNS servers are
visited before your host receives the IP address from DNS; the successive visits incur an RTT of
RTT1, . . . , RTTn. Further suppose that the Web page associated with the link references ten
additional small objects on the same server. Let RTT0 denote the RTT between the local host
and the server containing the web page. Assuming zero transmission time for all the objects.
How much time elapses from when you click on the link until your browser receives all the
objects with the following three situations? (1) Non-persistent HTTP with no parallel TCP
connections? (2) Non-persistent HTTP with the browser configured for 4 parallel connections?
(3) Persistent HTTP?.
Suppose within your Web browser you click on a link to obtain a Web p.pdf
Suppose within your Web browser you click on a link to obtain a Web page. The IP address for
the web server where the web page is hosted is not cached in your local host, so a DNS lookup is
necessary to obtain the IP address. Suppose that n DNS servers are visited before your host
receives the IP address from DNS; visiting each DNS server an RTT of D. Furthermore, suppose
that the Web page associated with the URL contains m objects. Let RTT 0 denote the RTT
between the local host and the server for each object (including base-HTML file). Assume all
objects are of the same size of L bits (including base-HTML file) and the transmission rate is C.
It is required to compute the total delay from when the client clicks on the link until the client
receives all the objects for each of the following scenarios: (a) (3 Points) Non-persistent HTTP
without parallel TCP connections. (b) (3 Points) Persistent HTTP without pipelining, i.e.
requesting one object, receiving it, then requesting the next one, and so on. Hint: The browser
needs to obtain first the IP of web server. This time is fixed and does not depend on the HTTP
protocol..
4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx
4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptxv4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.pptx4-Lect_4-2.ppt
HTTP & HTML & Web
Overview of HTTP, HTML, WWW and web technologies.
The combo HTTP and HTML is the foundation of the World Wide Web (WWW).
HTML (HyperText Markup Language) defines a text-based format for describing the contents of a web page. HTML is based on tags similar to XML (eXtensible Markup Language), but its definition is less strict.
HTML pages are transported with the HTTP protocol (HyperText Transmission Protocol) over TCP/IP based networks.
The power of the WWW comes with the links based on URLs (Uniform Resource Locators) that connect pages to form a web of content.
Browsers display links as clickable items that, when clicked, trigger the browser to load the web page pointed to by the link.
This statelessness contributed a lot to the stability and scalability of the world wide web where web servers are only tasked with the delivery of web pages while the browser is responsible for the rendering of web pages.
The static nature of the early World Wide Web was soon augmented with the dynamic creation of web pages by web servers or by enriching static web pages with dynamic content.
Technologies like CGI (Common Gateway Interface), JSP (Java Server Pages) or ASP (Active Server Pages) were developed to provide the infrastructure to build dynamic web applications.
These server-side technologies were complemented with client-side technologies like Javascript and AJAX (Asynchronous Javascript And XML).
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running on another host?
2 What is the HOL blocking issue in HTTP/1.1? How does HTTP/2 attempt to
resolve it?
3 Why do HTTP, FTP, SMTP, and POP3 run on top of TCP rather than UDP?
4 List at least two advantages and disadvantages of using POP3 instead of IMAP.
5 Besides network-related considerations such as network delay, loss, and
bandwidth performance, other important factors might go into designing a CDN
server selection strategy. What are they?
6 Consider a short, 10-meter link, over which a sender can transmit at a rate of 150 bits/sec in
both directions. Suppose that packets containing data are 100,000 bits long, and packets
containing only control (e.g., ACK or PROBLEMS 171 handshaking) are 200 bits long. Assume
that N parallel connections each get 1/N of the link bandwidth. Now consider the HTTP
protocol, and suppose that each downloaded object is 100 Kbits long, and that the initial
downloaded object contains 10 referenced objects from the same sender. Would parallel
downloads via parallel instances of non-persistent HTTP make sense in this case? Now consider
persistent HTTP. Do you expect significant gains over the non-persistent case? Justify and
explain your answer.
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b. Use various whois databases on the Internet to obtain the names of two DNS servers. Indicate
which whois databases you used.
c. Use nslookup on your local host to send DNS queries to three DNS servers: your local DNS
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You will develop a web server that handles one HTTP request at a time. Your web server should
accept and parse the HTTP request, get the requested file from the servers file system, create an
HTTP response message consisting of the requested file, and then send the response directly to
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Create an HTML file and store this in the same directory as your server program. You can create
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text.
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Create the server socket (using TCP) and bind it to the IP address of the server and port
number.
Establish a listening socket to listen for incoming connections from a client.
Establish a separate connection socket for the client-server.
The server should then receive a request from the client. This message is the file name of
the HTML file that the client is requesting. The HTML file needs to be stored in the same
directory as the server script.
The server will need to extract the requested object from the message and open the file to
then read the contents of the requested file.
The server then sends an HTTP response (the status code) if the file is found and then
returns the contents of the file to the client.
The connection socket is then closed since we are only servicing one request per
connection.
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close the connection socket.
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so make sure to kill the process manually when not working on the program. *
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Write your own HTTP client to test your server.
Your client will connect to the server using a TCP connection. You will need to accept
the IP address of the server and port number as input from the user.
Send a request to the server. This is a message containing the file path of the file the
client wants to retrieve. The file path is obtained as input from the user.
Display the server response and contents of the file as output. The client should be able to
receive all the bytes of data sent from the server regardless of the number of bytes of your
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Close the connection.
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You will develop a web server that handles one HTTP request at a time. Your web server should
accept and parse the HTTP request, get the requested file from the servers file system, create an
HTTP response message consisting of the requested file, and then send the response directly to
the client. If the requested file is not present in the server, the server should send an HTTP 404
Not Found message back to the client.
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text.
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Create the server socket (using TCP) and bind it to the IP address of the server and port
number.
Establish a listening socket to listen for incoming connections from a client.
Establish a separate connection socket for the client-server.
The server should then receive a request from the client. This message is the file name of
the HTML file that the client is requesting. The HTML file needs to be stored in the same
directory as the server script.
The server will need to extract the requested object from the message and open the file to
then read the contents of the requested file.
The server then sends an HTTP response (the status code) if the file is found and then
returns the contents of the file to the client.
The connection socket is then closed since we are only servicing one request per
connection.
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close the connection socket.
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so make sure to kill the process manually when not working on the program. *
Client Code
Write your own HTTP client to test your server.
Your client will connect to the server using a TCP connection. You will need to accept
the IP address of the server and port number as input from the user.
Send a request to the server. This is a message containing the file path of the file the
client wants to retrieve. The file path is obtained as input from the user.
Display the server response and contents of the file as output. The client should be able to
receive all the bytes of data sent from the server regardless of the number of bytes of your
specific HTML file.
Close the connection.
What to turn in:
ReadMe
Server code
Client code
HTML file that you used to test your program.
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1 What information is used by a process running on one host to identify a process
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2 What is the HOL blocking issue in HTTP/1.1? How does HTTP/2 attempt to
resolve it?
3 Why do HTTP, FTP, SMTP, and POP3 run on top of TCP rather than UDP?
4 List at least two advantages and disadvantages of using POP3 instead of IMAP.
5 Besides network-related considerations such as network delay, loss, and
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server selection strategy. What are they?
6 Consider a short, 10-meter link, over which a sender can transmit at a rate of 150 bits/sec in
both directions. Suppose that packets containing data are 100,000 bits long, and packets
containing only control (e.g., ACK or PROBLEMS 171 handshaking) are 200 bits long. Assume
that N parallel connections each get 1/N of the link bandwidth. Now consider the HTTP
protocol, and suppose that each downloaded object is 100 Kbits long, and that the initial
downloaded object contains 10 referenced objects from the same sender. Would parallel
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persistent HTTP. Do you expect significant gains over the non-persistent case? Justify and
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b. Use various whois databases on the Internet to obtain the names of two DNS servers. Indicate
which whois databases you used.
c. Use nslookup on your local host to send DNS queries to three DNS servers: your local DNS
server and the two DNS servers you found in part
(b). Try querying for Type A, NS, and MX reports. Summarize your findings. d. Use nslookup to
find a Web server that has multiple IP addresses. Does the Web server of your institution (school
or company) have multiple IP addresses?
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Web Server Python Assignment You will develop a web server that ha.pdf
Web Server Python Assignment
You will develop a web server that handles one HTTP request at a time. Your web server should
accept and parse the HTTP request, get the requested file from the servers file system, create an
HTTP response message consisting of the requested file, and then send the response directly to
the client. If the requested file is not present in the server, the server should send an HTTP 404
Not Found message back to the client.
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Create an HTML file and store this in the same directory as your server program. You can create
any HTML file you would like for this assignment, but it should at a minimum contain a body of
text.
Server code
Create the server socket (using TCP) and bind it to the IP address of the server and port
number.
Establish a listening socket to listen for incoming connections from a client.
Establish a separate connection socket for the client-server.
The server should then receive a request from the client. This message is the file name of
the HTML file that the client is requesting. The HTML file needs to be stored in the same
directory as the server script.
The server will need to extract the requested object from the message and open the file to
then read the contents of the requested file.
The server then sends an HTTP response (the status code) if the file is found and then
returns the contents of the file to the client.
The connection socket is then closed since we are only servicing one request per
connection.
The server should send the appropriate status code to the client if the file is not found and
close the connection socket.
* There is nothing in the code shutting down the server program if the connection is successful,
so make sure to kill the process manually when not working on the program. *
Client Code
Write your own HTTP client to test your server.
Your client will connect to the server using a TCP connection. You will need to accept
the IP address of the server and port number as input from the user.
Send a request to the server. This is a message containing the file path of the file the
client wants to retrieve. The file path is obtained as input from the user.
Display the server response and contents of the file as output. The client should be able to
receive all the bytes of data sent from the server regardless of the number of bytes of your
specific HTML file.
Close the connection.
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Write in Python please Web Server Python Assignment You will dev.pdf
Write in Python please
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You will develop a web server that handles one HTTP request at a time. Your web server should
accept and parse the HTTP request, get the requested file from the servers file system, create an
HTTP response message consisting of the requested file, and then send the response directly to
the client. If the requested file is not present in the server, the server should send an HTTP 404
Not Found message back to the client.
HTML File
Create an HTML file and store this in the same directory as your server program. You can create
any HTML file you would like for this assignment, but it should at a minimum contain a body of
text.
Server code
Create the server socket (using TCP) and bind it to the IP address of the server and port
number.
Establish a listening socket to listen for incoming connections from a client.
Establish a separate connection socket for the client-server.
The server should then receive a request from the client. This message is the file name of
the HTML file that the client is requesting. The HTML file needs to be stored in the same
directory as the server script.
The server will need to extract the requested object from the message and open the file to
then read the contents of the requested file.
The server then sends an HTTP response (the status code) if the file is found and then
returns the contents of the file to the client.
The connection socket is then closed since we are only servicing one request per
connection.
The server should send the appropriate status code to the client if the file is not found and
close the connection socket.
* There is nothing in the code shutting down the server program if the connection is successful,
so make sure to kill the process manually when not working on the program. *
Client Code
Write your own HTTP client to test your server.
Your client will connect to the server using a TCP connection. You will need to accept
the IP address of the server and port number as input from the user.
Send a request to the server. This is a message containing the file path of the file the
client wants to retrieve. The file path is obtained as input from the user.
Display the server response and contents of the file as output. The client should be able to
receive all the bytes of data sent from the server regardless of the number of bytes of your
specific HTML file.
Close the connection.
What to turn in:
ReadMe
Server code
Client code
HTML file that you used to test your program.
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