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Tue Apr 2 00:56:56 UTC 2013

akamai.net. Therefore, I make a query to akamai.net to see what TTL it
returns

I have following questions:
1. Which server decides the max. TTL values (the upper bound) for the
"CNAME" and "A" entries in STEP-1? I found that for CNAME the max. TTL
is 300 and for the A record its 60.

2. Since, www.yahoo.com. = www.yahoo-ht3.akadns.net.  (CNAME)  and
AUTHORITY is akadns.net. www.yahoo-ht3.akadns.net entry exists in the
zone controlled by akadns.net server. As STEP-3 SOA records show that
for akadns.net the TTL = 180, why the reply from akadns.net for
www.yahoo-ht3.akadns.net gives TTL = 60 (as seen in STEP-2)

Thank you.
PS: The same steps for www.google.com show no mismatch in TTL values
(specified in SOA and direct replies from ns4.google.com)

-- 
Best Regards,
Vishwas.
ivishwas.googlepages.com

A writer needs three things, experience, observation and imagination,
any two of which, at times any one of which, can supply the lack of
the others.  --  William Faulkner