Question

This customer has computers and a domain controller. The domain controller’s DNS is configured to use the ISP’s DNS Servers as its forwarder.

Tell me everything you know about how DNS resolution would work for an NSLOOKUP on www.google.com from the workstation 10.10.1.5 with a DNS Server assigned by the DHCP Server of 10.10.1.2.

DNS Test Cloud 10.10.1.5/24 10.10.1.1124 75.185.42.152/24

Answer 1

from A 10.10.1.5/24 , NSLOOKUP www.google.com

it will forwared DNS packet to firewall 10.10.1.1 and firewall will forward this DNS port 53 packet to the ip 75.185.42.152/24 which is ISP ip to find the route to google and forward packet to the ISP.

like my router ip is 192.168.1.1 in your case you have firewall 10.10.1.1

my route to the google is shown in the trace how it travers from router to ISP to google

2cmd.exe Microsoft Windows [Version 10..17134.706] (c) 2018 Microsoft Corporation. All rights reserved C: \Users\Administrator>nslookup www.google.com Server: google-public-dns-a.google.com Address: 8.8.8.8 Non-authoritative answer: Name Addresses 2484:6800:4009:805::2804 www.google.com 172.217.166.68 C:\Users\Administrator>tracert www.google.com Tracing route to www.google.com [172.217.26.228] over a maximum of 38 hops: 1 ms 3 ms 8 ms 26 ms 4 ms 2 ms 8 ms 27 ms 1 ms 192.168.1.1 2 ms 150.129.54.65 9 ms 150.107.252.33 27 ms 13.241.47.217 5 26 ms 26ms 26 ms 13.241.47.130 6 26 ms 26 ms 35 ms 108.170.248.161 7 27 ms 27 ms 26 ms 216.239.51.197 25 ms25 ms boma5s09-in-f4.1e100.net [172.217.26.228] Trace complete C:\Users\Administrator> ENG 242 PM U: 1.1 K 29/04/2019

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