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Kurose and Ross Edition 6 Exercise 3 Question R18 (Page No 288)
True or false? Consider congestion control in TCP. When the timer expires at the sender, the value of ssthresh is set to one half of its previous value.

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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2

Kurose and Ross Edition 6 Exercise 3 Question R17 (Page No 287)
Suppose two TCP connections are present over some bottleneck link of rate R bps. Both connections have a huge file to send (in the same direction over the bottleneck link). The transmissions of the files start at the same time. What transmission rate would TCP like to give to each of the connections?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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3

Kurose and Ross Edition 6 Exercise 3 Question R15 (Page No 287)
Suppose Host A sends two TCP segments back to back to Host B over a TCP connection. The first segment has sequence number 90; the second has sequence number 110. How much data is in the first segment? Suppose that the ... segment arrives at B. In the acknowledgment that Host B sends to Host A, what will be the acknowledgment number?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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4

Kurose and Ross Edition 6 Exercise 3 Question R14 (Page No 287)
True or false? Host A is sending Host B a large file over a TCP connection. Assume Host B has no data to send Host A. Host B will not send acknowledgments to Host A because Host B cannot piggyback the acknowledgments ... 4 bytes of data over a TCP connection to Host B. In this same segment the acknowledgment number is necessarily 42.

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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5

Kurose and Ross Edition 6 Exercise 3 Question R13 (Page No 287)
Visit the Selective Repeat Java applet at the companion Web site. Have the source send five packets, and then pause the animation before any of the five packets reach the destination. Then kill the first packet and resume ... what happens. Finally, try sending six packets. What happens? How selective repeat and go back-n is different?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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6

Kurose and Ross Edition 6 Exercise 3 Question R12 (Page No 286)
Visit the Go-Back-N Java applet at the companion Web site. Have the source send five packets, and then pause the animation before any of the five packets reach the destination. Then kill the first packet and ... destination and kill the first acknowledgment. Describe again what happens. Finally, try sending six packets. What happens?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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7

Kurose and Ross Edition 6 Exercise 3 Question R11 (Page No 286)
Suppose that the roundtrip delay between the sender and receiver is constant and known to the sender. Would a timer still be necessary for protocol rdt 3.0 as shown in the figure, assuming that packets can be lost? Explain.

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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8

Kurose and Ross Edition 6 Exercise 3 Question R10 (Page No 286)
In our rdt protocols, why did we need to introduce timers?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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9

Kurose and Ross Edition 6 Exercise 3 Question R9 (Page No 286)
In our rdt protocols, why did we need to introduce sequence numbers?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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10

Kurose and Ross Edition 6 Exercise 3 Question R8 (Page No 286)
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 ... If they are being passed through different sockets, do both of the sockets have port 80? Discuss and explain.

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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11

Kurose and Ross Edition 6 Exercise 3 Question R6 (Page No 286)
Is it possible for an application to enjoy reliable data transfer even when the application runs over UDP? If so, how?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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12

Kurose and Ross Edition 6 Exercise 3 Question R5 (Page No 286)
Why is it that voice and video traffic is often sent over TCP rather than UDP in today’s Internet? (Hint: The answer we are looking for has nothing to do with TCP’s congestion-control mechanism.)

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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13

Kurose and Ross Edition 6 Exercise 3 Question R4 (Page No 286)
Describe why an application developer might choose to run an application over UDP rather than TCP.

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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14

Kurose and Ross Edition 6 Exercise 3 Question R3 (Page No 286)
Consider a TCP connection between Host A and Host B. Suppose that the TCP segments traveling from Host A to Host B have source port number x and destination port number y. What are the source and destination port numbers for the segments traveling from Host B to Host A?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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15

Kurose and Ross Edition 6 Exercise 3 Question R2 (Page No 285)
Consider a planet where everyone belongs to a family of six, every family lives in its own house, each house has a unique address, and each person in a given house has a unique name. Suppose this planet has a mail ... protocol, does the mail service ever have to open the envelope and examine the letter in order to provide its service?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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16

Kurose and Ross Edition 6 Exercise 3 Question R1 (Page No 285)
Suppose the network layer provides the following service. The network layer in the source host accepts a segment of maximum size 1,200 bytes and a destination host address from the transport layer. The network layer then guarantees ... In your protocols, does the transport layer have to do anything in the core of the computer network?

ajaysoni1924 asked in Computer Networks Apr 18, 2019

by ajaysoni1924

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17

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.

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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18

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?

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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19

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?

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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20

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.

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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21

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.

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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22

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.

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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23

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?

ajaysoni1924 asked in Computer Networks Apr 10, 2019

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24

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?

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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25

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.

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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26

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.

ajaysoni1924 asked in Computer Networks Apr 10, 2019

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27

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

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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28

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?

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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29

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.

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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30

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?

ajaysoni1924 asked in Computer Networks Apr 10, 2019

by ajaysoni1924

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