Recent questions tagged application-layer-protocols

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Kurose and Ross Edition 6 Exercise 2 Question P14 (Page No 174)
How does SMTP mark the end of a message body? How about HTTP? Can HTTP use the same method as SMTP to mark the end of a message body? Explain.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 35 views

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Kurose and Ross Edition 6 Exercise 2 Question P13 (Page No 174)
What is the difference between MAIL FROM: in SMTP and From: in the mail message itself?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 20 views

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Kurose and Ross Edition 6 Exercise 2 Question P3 (Page No 171)
Consider an HTTP client that wants to retrieve a Web document at a given URL. The IP address of the HTTP server is initially unknown. What transport and application-layer protocols besides HTTP are needed in this scenario?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 26 views

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Kurose and Ross Edition 6 Exercise 2 Question P2 (Page No 171)
Read RFC 959 for FTP. List all of the client commands that are supported by the RFC.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 12 views

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Kurose and Ross Edition 6 Exercise 2 Question P1 (Page No 171)
True or false? A user requests a Web page that consists of some text and three images. For this page, the client will send one request message and receive four response messages. Two distinct Web pages (for example, ... indicates when the object in the response was last modified. HTTP response messages never have an empty message body.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 18 views

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Kurose and Ross Edition 6 Exercise 2 Question R20 (Page No 170)
Look over your received emails, and examine the header of a message sent from a user with a .edu email address. Is it possible to determine from the header the IP address of the host from which the message was sent? Do the same for a message sent from a Gmail account.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 11 views

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Kurose and Ross Edition 6 Exercise 2 Question R19 (Page No 170)
Is it possible for an organization’s Web server and mail server to have exactly the same alias for a hostname (for example, $foo.com$)? What would be the type for the RR that contains the hostname of the mail server?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 21 views

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Kurose and Ross Edition 6 Exercise 2 Question R18 (Page No 170)
From a user’s perspective, what is the difference between the download-and delete mode and the download-and-keep mode in POP3?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 22 views

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Kurose and Ross Edition 6 Exercise 2 Question R17 (Page No 170)
Print out the header of an e-mail message you have recently received. How many $Received:$ header lines are there? Analyze each of the header lines in the message.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 15 views

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Kurose and Ross Edition 6 Exercise 2 Question R16 (Page No 170)
Suppose Alice, with a Web-based e-mail account (such as Hotmail or Gmail), sends a message to Bob, who accesses his mail from his mail server using POP3. Discuss how the message gets from Alice’s host to Bob’s host. Be sure to list the series of application-layer protocols that are used to move the message between the two hosts.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 14 views

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Kurose and Ross Edition 6 Exercise 2 Question R15 (Page No 170)
Why is it said that FTP sends control information “out-of-band”?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 14 views

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Kurose and Ross Edition 6 Exercise 2 Question R13 (Page No 170)
Describe how Web caching can reduce the delay in receiving a requested object. Will Web caching reduce the delay for all objects requested by a user or for only some of the objects? Why?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 14 views

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Kurose and Ross Edition 6 Exercise 2 Question R12 (Page No 169)
Consider an e-commerce site that wants to keep a purchase record for each of its customers. Describe how this can be done with cookies.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 9 views

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Kurose and Ross Edition 6 Exercise 2 Question R11 (Page No 169)
Why do HTTP, FTP, SMTP, and POP3 run on top of TCP rather than on UDP?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 8 views

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Kurose and Ross Edition 6 Exercise 2 Question R10 (Page No 169)
What is meant by a handshaking protocol?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 5 views

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16

Kurose and Ross Edition 6 Exercise 2 Question R8 (Page No 169)
List the four broad classes of services that a transport protocol can provide. For each of the service classes, indicate if either UDP or TCP (or both) provides such a service.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 19 views

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17

Kurose and Ross Edition 6 Exercise 2 Question R5 (Page No 169)
What information is used by a process running on one host to identify a process running on another host?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 5 views

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18

Kurose and Ross Edition 6 Exercise 2 Question R4 (Page No 169)
For a P2P file-sharing application, do you agree with the statement, “There is no notion of client and server sides of a communication session”? Why or why not?

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 4 views

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19

Kurose and Ross Edition 6 Exercise 2 Question R1 (Page No 169)
List five nonproprietary Internet applications and the application-layer protocols that they use.

asked Apr 10 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 7 views

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20

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 32 (Page No. 761)
Write a program in JavaScript that accepts an integer greater than 2 and tells whether it is a prime number. Note that JavaScript has if and while statements with the same syntax as C and Java. The modulo operator is %. If you need the square root of x, use Math.sqrt (x).

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 12 views

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Andrew S. Tanenbaum Edition 5th Exercise 7 Question 46 (Page No. 762)
Some cybersquatters have registered domain names that are misspellings of common corporate sites, for example, www.microsfot.com. Make a list of at least five such domains.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 6 views

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Andrew S. Tanenbaum Edition 5th Exercise 7 Question 47 (Page No. 762)
Numerous people have registered DNS names that consist of www.word.com, where word is a common word. For each of the following categories, list five such Web sites and briefly summarize what it is (e.g., www.stomach. ... , foods, household objects, and body parts. For the last category, please stick to body parts above the waist.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 8 views

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23

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 48 (Page No. 762)
Rewrite the server of Fig. 6-6 as a true Web server using the GET command for HTTP 1.1. It should also accept the Host message. The server should maintain a cache of files recently fetched from the disk and serve requests from the cache when possible.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 8 views

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24

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 23 (Page No. 759)
Imagine that someone in the math department at Stanford has just written a new document including a proof that he wants to distribute by FTP for his colleagues to review. He puts the program in the FTP directory ftp/pub/forReview/newProof.pdf. What is the URL for this program likely to be?

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 9 views

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25

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 23 (Page No. 759)
Although it was not mentioned in the text, an alternative form for a URL is to use the IP address instead of its DNS name. Use this information to explain why a DNS name cannot end with a digit.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 8 views

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26

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 20 (Page No. 759)
Does Webmail use POP3, IMAP, or neither? If one of these, why was that one chosen? If neither, which one is it closer to in spirit?

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 38 views

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27

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 15 (Page No. 759)
In any standard, such as RFC 5322, a precise grammar of what is allowed is needed so that different implementations can interwork. Even simple items have to be defined carefully. The SMTP headers allow white space between the tokens. Give two plausible alternative definitions of white space between tokens.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 16 views

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28

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 14 (Page No. 759)
Suppose that John just set up an auto-forwarding mechanism on his work email address, which receives all of his business-related emails, to forward them to his personal email address, which he shares with his wife. John' ... vacation daemon on his work machine. What happens when an email is received at John's work email address?

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 23 views

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29

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 10 (Page No. 759)
A large law firm, which has many employees, provides a single email address for each employee. Each employee's email address is <login>@lawfirm.com. However, the firm did not explicitly define the format of the login. ... for the email addresses of all its employees. How can this be done without rocking the boat too much?

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 11 views

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30

Andrew S. Tanenbaum Edition 5th Exercise 7 Question 9 (Page No. 759)
Electronic mail systems need directories so people’s email addresses can be looked up. To build such directories, names should be broken up into standard components (e.g., first name, last name) to make searching possible. Discuss some problems that must be solved for a worldwide standard to be acceptable.

asked Mar 19 in Computer Networks by ajaysoni1924 Loyal (9.4k points) | 11 views

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