Computer Networks:

Physical Layers
Data link Layer(DLL)

Network Layer

Transport Layer:

Session and Presentation Layer:

Application Layer:

 
☚ OSI Model
Transmission Technique ☛

E-mail

E-mail  system support 5 basic functions they are as follows:

  1. Composition.
  2. Transfer
  3. Reporting
  4. Displaying
  5. Disposition.

Composition: Email user agent should enable users to 

  • Create an address email message.
  • Reply to email message received.

Display: Email user agent should enable users to.

  • Browse messages received by main identifying attributes.
  • Read or render message on demand.

Disposition: Email user agent should enable users to

  • Delete receipt message
  • Saved received message in a folder
  • Keep a receive message in users mailbox.

Reporting: E-mail facilities should report on message send go users

  • Can Discover from logs what message they have sent and when.
  • Are notified when they their message cannot be delivered
  • Can ask for email confirmation that message is received.

Transfer: E-mail facilities should

  • Transfer messages from sender to addressee
  • Copy with any delay or problems experience transfer may involve use of intermediate which.
  • Store and forward email for certain addresses
  • Act as Gateway to other email or messaging system

IMAP Protocol:

IMAP stands for internet message access protocol. It is an application layer Protocol which is utilized to get the messages from the mail server.

Features of IMAP:

  • IMAP is capable of managing multiple male boxes and organize them into categories.
  • IMAP provides flags to keep track of messages which are being seen.
  • IMAP makes it easy to download media when multiple files are attached. 

Advantages of IMAP 

  • IMAP offer synchronization across all the all the maintain session.
  •  it provides security over pop 3 protocol.
  •  user have remote access to all the content

Disadvantages of IMAP

  • It is complex to maintain.
  • It is slower to Load messages. 
  • Many browser are unavailable due to not supportive of IMAP. 
☚ OSI Model
Transmission Technique ☛

Computer Networks:

Physical Layers
Data link Layer(DLL)

Network Layer

Transport Layer:

Session and Presentation Layer:

Application Layer: