Lab 04: Wireshark Lab of DNS and HTTP

Part 1: DNS Protocol

Usage of ipconfig:

ipconfig /all
ipconfig /displaydns
ipconfig /flushdns

Resource Records (RRs) in DNS distributed database:

(Name, Value, Type, TTL)

Usage of nslookup

nslookup [-option] name [server]

nslookup -type=A
nslookup -type=NS
nslookup -type=CNAME name_of_server

Part 2: HTTP Protocol

Web Caching

If-modified-since / Etag

Wireshark Lab: HTTP

Please download Wireshark_HTTP_v6.1.pdf for the instruction of this lab session.

Part 3: Miscellaneous

Filters for Wireshark

Find the address of the webserver:""

Locate specific http connection: && http