Electronic mail - application layer, Computer Networking

Assignment Help:

Electronic Mail

One  of the  most popular internet  services is electronic mail ( e mail). At  the beginning  of the internet era teh message sent by  electronic  mail were short and  consisted of text  only they let people  exchange  quick  memos. Today  electronic  mail is such  more  complex. It allows  a message  to include  text audio  and video  it also  allows one message to sent  to one or more  recipients.

Figure presents a high  level  view of the internet  of the  internet mail  system. It has  three major components user agents mail servers, and  the simple  mail  transfer protocol (SMTP). We now  assume  that a  sender  heena sending an e mail  message  to a recipient Harish. User  agents allow users to read reply to forward save and compose message. When  server when Harish  wants to read a message his user agent retrieves the message from his mailbox in his mail server.

262_electronic mail.jpg

                                                                figure A high  level view of the Internet e- mail system

 

Each recipient  such as harsh  has a mailbox  located in one of the servers. Harish  mail box manages  and maintains the messages that have been sent to him. A  messages  starts its journey in the sender user agent  travels to the sender mail server and travels  to the recipient mail  server where  it is deposited in the recipient mail box  when  box  authenticates Harish  ( with  user name and password).  If Heena serve cannot  deliver mail to  Harish  server Heena  server holds the message in a message  queue  and attempts to transfer the message  later.


Related Discussions:- Electronic mail - application layer

Illustrate user agent services, Q. Illustrate User Agent Services? Use...

Q. Illustrate User Agent Services? User Agent (UA) Services - Provide template for user to compose a message - Reads incoming messages - Allows a user to reply to m

Define the term pipelined processor, Pipelined Processor A pipeline pro...

Pipelined Processor A pipeline processor can be described as a processor which comprises of a series of processing circuits known as segments and a stream of operands (data) is

Request to a server, If a client gives a 4096-byte request to a server loca...

If a client gives a 4096-byte request to a server located 50 km away on a 1 Gbps fiber optic, then what is the efficiency of the line during this time? Suppose that the server give

Explain the OSI Model Facts, OSI Model Facts The OSI model classifies a...

OSI Model Facts The OSI model classifies and organizes the methods that hosts perform to maintain data for transport across the network. You should be familiar with the OSI m

What do you use the aux port for, The auxiliary port is used to link a mode...

The auxiliary port is used to link a modem to for dial backups.

Define the term socks- network security, Define the term Socks- Network sec...

Define the term Socks- Network security As it is well known, each type of network security protects data at a different layer of the OSI model. Built-in at each layer lies the

Ip checksum, This code properly implements the IP checksum function on a 32...

This code properly implements the IP checksum function on a 32-bit machine: unsigned short cksum(unsigned short *buf, int count) { unsigned long sum = 0; while (count--) { sum += *

How receiver detects error, How receiver detects error The frame is 100...

How receiver detects error The frame is 10011101. The generator is 1001. The message after appending the three zeros is 10011101000. The reminder on dividing 10011101000 by 100

Distinguish between udp and tcp, Question: (a) Distinguish between UDP ...

Question: (a) Distinguish between UDP and TCP. (b) You have been asked to design and implement a chat application for a university. Which protocol could you used TCP or UDP

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd