Recent questions tagged kurose-and-ross

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.

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...

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 becaus...

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 destina...

In our rdt protocols, why did we need to introduce timers?

In our rdt protocols, why did we need to introduce sequence numbers?

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 a...

Is it possible for an application to enjoy reliable data transfer even when the application runs over UDP? If so, how?

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 conge...

Describe why an application developer might choose to run an application over UDP rather than TCP.

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...

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.

What is the difference between MAIL FROM: in SMTP and From: in themail message itself?

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...

Read RFC 959 for FTP. List all of the client commands that are supported bythe RFC.

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 m...

Look over your received emails, and examine the header of a message sentfrom a user with a .edu email address. Is it possible to determine from theheader the IP address o...

Is it possible for an organization’s Web server and mail server to have exactlythe same alias for a hostname (for example, $foo.com$)? What would be thetype for the RR th...

From a user’s perspective, what is the difference between the download-and delete mode and the download-and-keep mode in POP3?

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 ...

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.

Why do HTTP, FTP, SMTP, and POP3 run on top of TCP rather than on UDP?