TCP vs IPC for DBLINK

Good Morning to all ;
MAY i know some details about TCP vs IPC connectivity (for DB LINK).
My Questions are ,
When we use TCP connectivity ? and
when we use ICP connectivity ?
IS this right ?
IPC connection does require listener ..
From this thread : https://forums.oracle.com/forums/thread.jspa?threadID=986797 +(final reply from i am al)+

969352 wrote:
Thanks a lot and fine sb.
The instance/DB does the username/password validation.
- Oh ! I don't know really this. May i get any related threads to understand ?
Oracle link n't giving any information about username/password verification
http://www.oracle.com/pls/db102/homepage .
Can i get any related articles (instance/DB* does the username/password validation.) ?*
Thanks sb ..are you unwilling or incapable to use online SEARCH &
then to Read The Fine Manual?
http://docs.oracle.com/cd/E11882_01/server.112/e25789/process.htm#sthref1834
"A session is a logical entity in the database instance memory that represents the state of a current user login to a database. For example, when a user is authenticated by the database with a password, a session is established for this user. A session lasts from the time the user is authenticated by the database until the time the user disconnects or exits the database application."

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Revision: 17461
Author:   [email protected]
Date:     2010-08-24 10:10:38 -0700 (Tue, 24 Aug 2010)
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