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The test setup for the DNSSEC tests has a secure root.

ns1 is the root server.

ns2 and ns3 are authoritative servers for the various test domains.

ns4 is a caching-only server, configured with the correct trusted key
for the root.

ns5 is a caching-only server, configured with the an incorrect trusted
key for the root.  It is used for testing failure cases.

ns6 is an caching and authoritative server used for testing unusual
server behaviors such as disabled DNSSEC algorithms.

ns7 is used for checking non-cacheable answers.

ns8 is a caching-only server, configured with unsupported and disabled
algorithms.  It is used for testing failure cases.

ns9 is a forwarding-only server.
