Target Skills:

By the end of this exercise you will be able to...

  • Describe the basics of messaging, in terms of the protocols used to send and deliver messages.

  •  

Tracing the Message Flow

Messaging BasicsUser interacts with decisions from a sender-hub-server-recipient, using SSL and IMAP4.
Client hits send:
Client Choices
(DNS lookup (get MX record back), TCP/IP connection
SSL connection, SMTP (deliver), POP3, IMAP4.
answer: DNS, TCP/IP, SSL, SMTP.

Message hub appears after DNS lookup(mx record back), with line connecting to client after TCP/IP.  Line looks secure after SSL, then message is sent to outside server after SMTP delivers.
Hub MTA Choices: SMTP acccept, SMTP deliver,
STORE message in user folder,
LDAP lookup, DNS lookup (gets back A record), TCP/IP,
,
SSL connection 
answer: SMTP accept, DNS lookup of Directory Server,LDAP lookup(get another msg server back),
DNS lookup of msg server,
SSL connection, SMTP deliver.
Message moves in server after SMTP accept, Directory server with line to server appears after DNS lookup of DS,
Query animation during LDAP,
MSG server appears with line after DNS lookup of server,
strong connection line after SSL,
Message leaves server after SMTP deliver.

MSG server choice box appears with same options as Hub.
answer: SMTP Accept, DNS lookup of DS, LDAP query, STORE. 
msg moves in after accept, animation line appears to DS after DNS lookup, anim during LDAP query, MSG STORE graphic appears after STORE and Message goes into it.

Receiver Client choice box  appears with same options as other client.
answer: DNS lookup of server (gets back A record), TCP/IP line connection is made, SSL, IMAP4.  anim: line after tcp/ip, secure after SSL, Message comes down (with copy left on server, too) after IMAP4.

wrapup
 
 
 

     

Produced By Netscape Learning.  Copyright ©1999 Netscape Communications, Inc.