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name resolution

I would like to see the Time-to-live (TTL) value for a 'AAAA' and A record for domains. How do I see Time-to-live (TTL) for a DNS record under Unix or Linux operating systems using command line options?
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DNS Name Resolution

Q. Can you explain DNS name resolution concept? Why I need to set DNS resolution for my Windows or Linux server? How do I setup DNS name resolution under Linux / UNIX server system?
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Q. My Oracle XE installation was working fine, but today I'm getting an error - which read as follows under Ubuntu Linux :

ORA-12154: TNS:could not resolve the connect identifier specified

How do I fix this problem without reinstalling Oracle?
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Free DNS Server

Q. My ISP DNS servers are overloaded, can you give me free dns server IP address for fast name resolution?
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Mail delivery: DNS: Service unavailable error

Q. My mail delivery fails with DNS: Service unavailable error. How do I fix this error under Linux / UNIX operating systems?
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Q. I'm getting following error on my Debian Linux system:

mv cannot move /etc/resolv.conf.dhclient-new to /etc/resolv.conf: Operation not permitted

How do I fix this problem?
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