3. Suppose Alice, with a Web-based e-mailaccount (such as Hotmail or gmail), sends amessage to Bob, who accesses his mailfrom his mail server using his user agent.Identify the correct sequence of theapplication-layer protocols that are used tomove the message between the two hosts.HTTP, SMTP,РОРЗHTTP,SMTΡ. FTPHTTP,SNMP,POP3HTTP, SMPT, SNMP

Given: Suppose Alice, with a Web-based e-mail account (such as Hotmail or Gmail), sends a message to…

Answered: 3. Suppose Alice, with a Web-based…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Are the TCP receive buffer and the client's application buffer same when utilizing HTTP streaming? How do they engage with one another if they don't talk to one another?
Write a Java TCP MultipleClient-Server Program for following scenario. NOTE Server Details are in the above figure Client-Server communicates continuously until the Client send Bye to the Server Use Multithreading for Multiple Clients NOTE : 1 cm = 0.39 inches 1 cm = 0.03 foot 1 cm = 0.01 meter Sample Ouput: Client Server 1 – cm to inches 2 – cm to foot 3 – cm to meter Enter length in cms (int) : 10 Received from Server 3.9 inches 1 – cm to inches 2 – cm to foot 3 – cm to meter Enter length in cms (int) : BYE Received from Server BYE Client DISCONNECTED Server Waiting for the Cline to be Connected… CONECTION ESTABLISHED Received From Client 10 cms Sent to Client 3.9 inches Received From Client BYE Sent to Client BYE HINT : When client choses 1 for cm to inches and enter 10, then the client sends the string 110 to the Server. Where the first char ‘1’ represents the cm to inches and the other 2 chars represents the 10.
Consider an employee using their computer to send and retrieve email at their workplace. Only Ethernet networks are used for physical connectivity, but the mail server is located on a separate network. The employee’s network and the mail server’s network are connected by a single router which also has a connection to the Internet via the workplace’s ISP. Explain how the employees email client sends and receives emails using the email server, indicating any protocols involved and where any encapsulation/decapsulation occurs as data travels between the client, local mail server, and remote mail servers.
In modern packet-switched networks, including the Internet, the source host segments long, application-layer messages (for example, an image or a music file) into smaller packets and sends the packets into the network. The receiver then reassembles the packets back into the original message. We refer to this process as message segmentation. Figure 1.27 illustrates the end-to-end transport of a message with and without message segmentation. Consider a message that is 8. 106 bits long that is to be sent from source to destination in Figure 1.27. Suppose each link in the figure is 2 Mbps. Ignore propagation, queuing, and processing delays. a. Consider sending the message from source to destination without message segmentation. How long does it take to move the message from the source host to the first packet switch? Keeping in mind that each switch uses store-and-forward packet switching, what is the total time to move the message from source host to destination host? b. Now suppose that…
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…
Q: Imagine a Web server that maintains a table in which client IP addresses are mapped to the most recently accessed Web pages. When a client connects to the server, the server looks up the client in its table, and if found, returns the registered page. Is this server stateful or stateless?
In HTTP version 1.0, a server marked the end of a transfer by closing the connection. Explain why, in terms of the TCP layer, this was a problem for servers. Find out how HTTP version 1.1 avoids this. How might a general-purpose request/reply protocol address this?
In the Internet of Things (IoT) web stack, what function do the protocols UDP and IPV6 serve? What exactly is the difference between a sensor having a static IP address and one that has a dynamically assigned IP address?
Https is a protocol used to secure websites from being tampered with by other parties without proper authorization. it bridges the gap between sender and receiver.Using protocols like secure socket layer/TLS, HTTPS encrypts data sent over the internet, making it unreadable to anybody who shouldn't have it.This prevents a "man in the middle" assault on the system.Such assaults intercept messages before they reach their intended recipient.It then transmits the revised information to the user.It guarantees the server's authenticity, too.
Here, we'll look at the differences between "connectionless" and "connection-based" protocols.
ICMP is one of the main protocols of the IP suite. However, ICMP is not associated with any transport layer protocol, such as Transmission Control Protocol (TCP) or User Datagram Protocol (UDP). It is a connectionless protocol, meaning a device does not need to open a connection with the target device before sending a message. This contrasts with TCP, for example, where a connection must be established before a message can be sent, establishing that both devices are ready through a TCP handshake. ICMP messages are transmitted as datagrams and consist of an IP header that encapsulates the ICMP data. A datagram, much like a packet, is a self-contained independent entity of data. Think of it as a package carrying a piece of a bigger message across the network. ICMP packets are IP packets with ICMP in the IP data portion. ICMP messages also contain the entire IP header from the original message, so the end system knows which packet failed. How can ICMP packets be misused by an attacker…
True or false 6. Before sending a data packet into a packet-switching network, the source must determine all of the links that the packet will traverse between source and destination. 7. With non-persistent connections between a web browser and a web server, it is possible for a single TCP segment to carry two distinct HTTP request messages.

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