hw 3 1-23

hw 3 1-23 - 1. Run nslookup to obtain the IP address of a...

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1. Run nslookup to obtain the IP address of a Web server in Asia. www.yahoo.co.kr 206.190.60.37 2. Run nslookup to determine the authoritative DNS servers for a university in Europe. nslookup –type=ns ox.ac.uk dns1.ox.ac.uk 3. Run nslookup so that one of the DNS servers obtained in Question 2 is queried for the mail servers for Yahoo! mail. 4. Locate the DNS query and response messages. Are then sent over UDP or TCP? UDP 5. What is the destination port for the DNS query message? What is the source port of DNS response message? Src port: domain (53) Dst port: res-sap (3163) 6. To what IP address is the DNS query message sent? Use ipconfig to determine the IP address of your local DNS server. Are these two IP addresses the same? 128.238.38.160 No, mine is at 192.168.1.2 7. Examine the DNS query message. What “Type” of DNS query is it? Does the query message contain any “answers”? Type : A (Host address) Answer : 0 which means there weren’t any answer.
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This note was uploaded on 03/28/2012 for the course IT 420, 245 taught by Professor Kattering during the Spring '12 term at NJIT.

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hw 3 1-23 - 1. Run nslookup to obtain the IP address of a...

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