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CCIE Security Exam Certification Guide by Henry Benjamin

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Chapter 3 Q & A Answers

1: According to RFC 1700, what is the well-known TCP/UDP port used by DNS?

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A1: Answer: RFC 1700 defines the well-known ports for the whole TCP/IP protocol suite. For DNS, the well-known port for TCP/UDP is number 53.
2: What does the IOS command no ip domain-lookup accomplish?

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A2: Answer: This IOS command disables DNS queries for network administrators ...

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