# 網概 hw2


## Question 1-1
Run nslookup to obtain the IP address of the web server for the Indian Institute of Technology in Bombay, India: www.iitb.ac.in. What is the IP address of www.iitb.ac.in.
Ans: 103.21.124.10

## Question 1-2
What is the IP address of the DNS server that provided the answer to your nslookup command in question 1 above?
Ans: 1.1.1.1

## Question 1-3
Did the answer to your nslookup command in question 1 above come from an authoritative or non-authoritative server?
Ans: non-authoritative server


## Question 2-1:
Locate the first DNS query message resolving the name gaia.cs.umass.edu. Is this query message sent over UDP or TCP?
Ans: TCP

## Question 2-2:
What is the destination port for the DNS query message? What is the source port of the DNS response message?

Ans: destination port: 50243, source port: 443

## Question 2-3:
To what IP address is the DNS query message sent?
Ans: 1.1.1.1