Q#234 Assume that the RTT between a client and the local DNS server is RTTI, while...
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Q#234 Assume that the RTT between a client and the local DNS server is RTTI, while the RTT between the local DNS server and other DNS servers is RTTr. Assume that no DNS server performs caching. a. What is the total response time for the scenario illustrated in Figure (i)? b. What is the total response time for the scenario illustrated in Figure (ii)? C. Assume now that the DNS record for the requested name is cached at the local DNS server. What is the total response time for the two scenarios? Root DNS server Root DNS server Local DNS server dns.nyu.edu TLD DNS server Local DNS server dns.nyu.edu TLD DNS server Requesting host cse.nyu.edu Authoritative DNS server dns.umass.edu gaia.cs.umass.edu Figure (i) Authoritative DNS server Requesting host cse.nyu.edu dns.umass.edu gaia.cs.umass.edu Figure (ii) Q#234 Assume that the RTT between a client and the local DNS server is RTTI, while the RTT between the local DNS server and other DNS servers is RTTr. Assume that no DNS server performs caching. a. What is the total response time for the scenario illustrated in Figure (i)? b. What is the total response time for the scenario illustrated in Figure (ii)? C. Assume now that the DNS record for the requested name is cached at the local DNS server. What is the total response time for the two scenarios? Root DNS server Root DNS server Local DNS server dns.nyu.edu TLD DNS server Local DNS server dns.nyu.edu TLD DNS server Requesting host cse.nyu.edu Authoritative DNS server dns.umass.edu gaia.cs.umass.edu Figure (i) Authoritative DNS server Requesting host cse.nyu.edu dns.umass.edu gaia.cs.umass.edu Figure (ii)
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Principles Of Information Security
ISBN: 9780357506431
7th Edition
Authors: Michael E. Whitman, Herbert J. Mattord
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