Clarification on bind response

[rams]

Hi,

I have set up data as follows in bind.
Zone: rameshops5526old.com

maint.rameshops5526old.com. 300 IN      CNAME
maint.global.rameshops5526old.com.
rameshops5526old.com.   21600   IN      NS      dns5.rameshops5526old.com.
rameshops5526old.com.   21600   IN      NS      dns2.rameshops5526old.com.
rameshops5526old.com.   21600   IN      NS      dns1.rameshops5526old.com.
rameshops5526old.com.   21600   IN      NS      dns6.rameshops5526old.com.
rameshops5526old.com.   21600   IN      NS      dns4.rameshops5526old.com.
rameshops5526old.com.   21600   IN      NS      dns3.rameshops5526old.com.
global.rameshops5526old.com. 300 IN     NS      j.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      a.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      l.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      d.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      b.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      e.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      c.ns.nsatc.net.

Queried against bind and get the reposne as follows

[root at stulcqacustbind2 recursive_enabled]# dig @10.31.145.194
maint.rameshops5526old.com.
; <<>> DiG 9.6.1-P3 <<>> @10.31.145.194 maint.rameshops5526old.com.
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16855
;; flags: qr *aa* rd; QUERY: 1, ANSWER: 1, AUTHORITY: 7, ADDITIONAL: 0
;; WARNING: recursion requested but not available
;; QUESTION SECTION:
;maint.rameshops5526old.com.    IN      A
;; ANSWER SECTION:
maint.rameshops5526old.com. 300 IN      CNAME
maint.global.rameshops5526old.com.
;; AUTHORITY SECTION:
global.rameshops5526old.com. 300 IN     NS      e.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      l.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      a.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      j.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      c.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      d.ns.nsatc.net.
global.rameshops5526old.com. 300 IN     NS      b.ns.nsatc.net.
;; Query time: 2 msec
;; SERVER: 10.31.145.194#53(10.31.145.194)
;; WHEN: Tue Aug 24 06:26:31 2010
;; MSG SIZE  rcvd: 195
Here AA flag is returning is it correct? because domain "
global.rameshops5526old.com. " delegated so we should not return AA flag
right? Please clarify me.

Thanks & Regards,
Ramesh
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