hw3cse - Homework 3 1 DNS Suppose you have a Host C, a...

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Homework 3 1 DNS Suppose you have a Host C, a local name server L, and authoritative name servers A root , A com , and A google.com , where the naming convention A x means that the name server knows about the name zone x . A x is a variable and NOT a hostname. A root is a root name server known to L, with IP address 198.41.0.4. Assume that all name servers initially have nothing in their caches. a) Using the resource records below, provide the hostnames and IP addresses for A com and A google.com b) List the sequence of DNS queries and corresponding resource records that are exchanged when C wants to lookup the address for www.google.com. When a name server A x contacts A y , please specify the IP address for A y . The following represents the level of detail we are looking for: i) A x contacts A y at 1.2.3.4 to resolve www.foobar.com ii) A y returns resource records R 1 , R 2 , . . . , R n . c) Client C performs a lookup for mail.google.com immediately after the previous request. Assume all records have long TTLs. List the sequence of DNS queries and corresponding resource records exchanged during the lookup. Name Server Variable Resource Record A root { com, a.gtld-servers.net, NS, IN } A root { a.gtld-servers.net, 192.5.6.30, A, IN } A com { google.com, ns1.google.com, NS, IN
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This note was uploaded on 01/08/2011 for the course CSE cse105 taught by Professor Cs during the Fall '10 term at UCSD.

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hw3cse - Homework 3 1 DNS Suppose you have a Host C, a...

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