Got a doubt regarding Caching Server Implementation

[Sanjib Das]

Hi
I have setup a local domain my.domain. & it consists of two machines...
I configured one of them as primary server for my domain & another one
as caching server .For both these servers I'm using BIND-9.2.4 package
whenever I send query (using 'dig' command).....
from the second machine (machine where the caching server is running 
locally) 
first it looks into its own cache....if its available it sends from there 
itself...
otherwise sends it the primary server...now whenever it (caching 
server)sends to
primary server, it includes some OPT pseudo-RR in the additional section 
of the request...
even if I donot send any OPT RR in my query, which I send using dig from 
caching server.
I donno the exact reason...why it happens like this......

Please share your valuable comments.....


thanks & regards
Sanjib

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