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

What are the characteristics of client, What are the characteristics of Cli...

What are the characteristics of Client/Server? Service Encapsulation of services Shared resources Asymmetrical protocols Mix-and-match Transparency of location

What is the terminal emulation, What is the Terminal Emulation, in which la...

What is the Terminal Emulation, in which layer it comes? Ans) The use of software, installed on PC or LAN server, that permits the PC to function as if it were dumb terminal dir

Packet switching, Suppose there are exactly five packet switches (Figure 4)...

Suppose there are exactly five packet switches (Figure 4) between a sending host and a receiving host connected by a virtual circuit line (shown as dotted line in figure 4). The tr

Explain token passing -token ring, Token Passing - Token Ring (IEEE 802.5) ...

Token Passing - Token Ring (IEEE 802.5) Needs that station take turns sending data Token passing coordinates process Token is a especially formatted three-byte fr

What is border gateway protocol, What is BGP (Border Gateway Protocol)? ...

What is BGP (Border Gateway Protocol)? It is a protocol used to promote the set of networks that can be reached within an autonomous system. BGP enable this information to be c

Show data link and physical vs subnet, Q. Show Data link and Physical vs Su...

Q. Show Data link and Physical vs Subnet? - Data link layer The function of the Data Link Layer is -offers for the control of the physical layer and detects and possib

What is raid in ccna, A method used to standardize and categorize fault-tol...

A method used to standardize and categorize fault-tolerant disk systems. RAID levels give lot of mixes of performance, reliability, and cost. Some servers give three of the RAID le

Describe in a generic manner the packet of ipsec, Can you describe in a gen...

Can you describe in a generic manner the packet of IPSec

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