Target
Skills:
By the end of this exercise
you will be able to...
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Describe the basics of messaging,
in terms of the protocols used to send and deliver messages.
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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
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