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Answer:
It is used for "default TTL". When the TTL is not declared, this number will replace it.
===Mohak Vyas===
Q: What version of BIND are we using in the lab ?
A: 9.5.0-P2
Q: Name two new features in BIND9 that are not in BIND8.
A:
* With BIND 9.x, you can sign your domain zones as well as sign DNS requests to allow even more strict query and zone access rules.
* Although BIND 8.x servers can host domain zones that contain IPv6 addresses, it could not listen nor respond to queries transported using IPv6. BIND 9.x now be setup to listen to and respond over IPv6-only, IPv4-only, or a combination of IPv4 and IPv6. BIND 9.x also supports some additional IPv6-specific record data.
Q: How many root servers are there ?
A: 13
Q: Name 5 top-level domains.
A:
*.com
*.gov
*.edu
*.info
*.org