there are several ways:
using network packet analyst.
using metasploit
using wireshark
using scanners
ect
Use vulnerability scanning
Use vulnerability scanning
Ping and/or traceroute
daily
There is no specific ways to verify a PAN card by a common man but it is possible by the income tax officials by the computerised network as they update everything that come on their way.
Network and Sharing Center
MD5
Use the network connection utility to test connectivity, then connect to a known working internet address across the network.
A Cisco network engineer has to plan, impement, verify local an wide area enterprise network. Also work on advanced security, voice and wireless and video soloution.
Mutual Authentication Network+ Guide to Networks pg. 606
I had this issue with Carmax. As long as the vehicle is registered to you, you can trade it in without having a copy of your registration. Carmax has access to DMV records and they can verify who owns the vehicle. I'm speaking for California transactions. Not sure about out of state.
of course