Suppose Alice with a Web-based e-mail account (such as Gmail) sends it 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

Suppose Alice with a Web-based e-mail account (such as Gmail) sends it 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

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter13: Internet And Distributed Application Services

Section: Chapter Questions

Problem 15VE

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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.
Suppose Alan, with a Web-based e-mail account (such as Gmail or Yahoo! Mail), sends a message to Benson, who accesses his mail from his mail server using POP3. Discuss how the message gets from Alan's host to Benson's host. Be sure to list the series of application-layer protocols that are used to move the message between the two hosts.
Assume that Computer A, which is connected through an Ethernet cable to the Switch S1, is just powered on. The user opens a browser and then types a website address to receive the website from the Server (as shown in Figure 1). Write down all the important protocols that come into play by the time the first frame containing HTTP request reaches R1. (Note: Before HTTP frame, other frames have already been sent by other protocol(s).) Write down all the protocols with reference to the TCP Model as follows? Application Layer: Transport Layer: Internet Layer: Link Layer:
Assume that Computer A, which is connected through an Ethernet cable to the Switch S1, is just powered on. The user opens a browser and then types a website address to receive the website from the Server (as shown in Figure 1). Write down all the important protocols that come into play by the time the first frame containing http request reaches R1. (Note: Before http frame, other frames have already been sent by other protocol(s).) Write down all the protocols with reference to the TCP Model as follows. Application Layer: Transport Layer: Internet Layer: Link Layer: [Physical Layer (if needed)]: After writing down the protocols that come into play, briefly write the procedure as to what happens
The routing technique FLOODING is used in certain contexts. It means that Group of answer options Incoming packets are sent out on all router interfaces except where they came from. Incoming packets are sent out on all router interfaces. Incoming packets are sent out on the fastest router interface. Incoming packets are sent out on the two fastest router interfaces.
Suppose we have a web page which contains 10 objects including: a html main file, 8 jpg image, and a .mp3 background music. For simplicity, assume each of the 10 objects has a size of 4 Kbits and that each object can be completely transferred in one TCP packet. Furthermore, assume the round-trip time between the server and client is RTT= 250 ms, and the download rate is 1 Mbps. What will be the time it takes to complete transferring the web page running in the non-persistent mode? Total delay = ms
3. 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 his user agent. Identify the correct sequence of the application-layer protocols that are used to move the message between the two hosts. HTTP, SMTP,РОРЗ HTTP,SMTΡ. FTP HTTP,SNMP,POP3 HTTP, SMPT, SNMP
The following questions are related to HTTP protocol Q1. The first line of a HTTP request from some client to some server is basically made of where the web page file path is added. The path is shown as folders separated by slash. Q2. If an HTTP server responds to a client request and the response is a success, what is the http code and string that marks a success response? Must provide the code and the string as they appear in TCPDump or Wireshark traces. (note: use upper case for the string and also proper spacing in you answers. Keep the order of the string and the code as seen in TCPDump) Answer: code and string that marks a success response Q3. What http header field is used to identify an address of a web page (i.e. the URI) that linked to the resource currently being requested. This field indicates the last page the user/requester was on by the time they link to the requested page. Answer: The field that indicates the last page the user/requester was on is Q4. What is the http…
Match the statements in the left column with the appropriate architecture in the right column. There is a server that is always on. Processes may request service from other processes or provide service to other processes. There is always a client process and a server process in any communication. HTTP uses this architecture. Hosts are controlled by users and could be up or down unpredictably. Self-scalable. A. Peer-to-peer. B. Neither client-server nor peer-to-peer. C. Client-server or peer-to-peer. D. Client-server. E. TCP/IP architecture.
Consider a simple application-level protocol built on top of UDP that allows a client to retrieve a file from a remote server residing at a well-known address. The client first sends a request with a file name, and the server responds with a sequence of data packets containing different parts of the requested file. To ensure reliability and sequenced delivery, client and server use a stop-and-wait protocol. Ignoring the obvious performance issue, do you see a problem with this protocol? Think carefully about the possibility of processes crashing.
A client application connects to a server and sends an operation, and gets a result back. What happens then? Is the connection open, so that the client can send more operations? Answer the question comparing the protocols SMTP, FTP, HTTP, POP and IMAP. What are the pros and cons of keeping the connection open or closing it down after each operation?
Consider a simple UDP-based protocol for requesting files (based somewhat loosely on the Trivial File Transport Protocol, or TFTP). The client sends an initial file request, and the server answers (if the file can be sent) with the first data packet. Client and server then continue with a stop-and-wait transmission mechanism. (a) Describe a scenario by which a client might request one file but get another; you may allow the client application to exit abruptly and be restarted with the same port. (b) Propose a change in the protocol that will make this situation much less likely.