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Yes..LNS sends redo information from the primary to standby databases. The mode of information passed on depends on the type of apply that you are using in the parameter "log_archive_dest_n" where n stands for the destination number that is pointing to the standby database service on the primary database initialization parameter file. If you are using Real Time apply, then you would be using the term LGWR in the above mentioned parameter and remember that you require Standby Redo Logs created for the real time to be used.
2) Is it the LNS process that transmits redo data to a standby DB?
Yes ARCH is deprecated in 11g,but doesn't mean that ARCH will not ship Archive Logs in order to resolve Archive Log Gaps, though.
3) ARCH is deprecated in 11g. Does it mean that ARCH will not ship archive in order to resolve archive log gaps?