Chapter 3 “Do I Know This Already?” Quiz Answers
1: | RFC 1700 defines what well-known ports for DNS?
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A1: | Answer: e
DNS is permitted by RFC 1700 to use both TCP/UDP port 53. Typically UDP is vendor-configured for UDP port 53. |
2: | What supplies DNS security?
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A2: | Answer: e
DNS has no form of security, so any device can request name-to-IP address mappings. |
3: | What IOS command will stop a Cisco router from querying a DNS server when an invalid IOS command is entered on the EXEC or PRIV prompt?
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A3: | Answer: a
To disable DNS query lookup, the IOS command ... |
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