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A host is doing a DNS resolution for itself (it is running its own recursive DNS resolver). The host's resolver has already contacted two DNS resolvers and has cached their DNS responses for a query to "www.ucsd.edu". Given those responses are cached, what is the minimum number of DNS servers it will have to reach out to to resolve the domain name "courses.ucsd.edu"?   a) 1 b) 2 c) 3 d) 0

A host is doing a DNS resolution for itself (it is running its own recursive DNS resolver). The host's resolver has already contacted two DNS resolvers and has cached their DNS responses for a query to "www.ucsd.edu". Given those responses are cached, what is the minimum number of DNS servers it will have to reach out to to resolve the domain name "courses.ucsd.edu"?   a) 1 b) 2 c) 3 d) 0

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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A host is doing a DNS resolution for itself (it is running its own recursive DNS resolver). The host's resolver has already contacted two DNS resolvers and has cached their DNS responses for a query to "www.ucsd.edu". Given those responses are cached, what is the minimum number of DNS servers it will have to reach out to to resolve the domain name "courses.ucsd.edu"?

 

a) 1

b) 2

c) 3

d) 0

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