Wireshark how do i know if packet is encrypted?

Wireshark how do i know if packet is encrypted?

References

Reference NO 1

http://stackoverflow.com/questions/15206345/wireshark-how-do-i-know-if-packet-is-encrypted

Reference NO 2

http://wiki.wireshark.org/HowToDecrypt802.11

Reference NO 3

http://ask.wireshark.org/questions/23451/how-can-i-tell-if-my-connection-is-encrypted

Reference NO 4

http://wirewatcher.wordpress.com/2010/07/20/decrypting-ssl-traffic-with-wireshark-and-ways-to-prevent-it/

Reference NO 5

http://www.packetech.com/showthread.php?1585-Use-Wireshark-to-Decrypt-HTTPS

Reference NO 6

http://hardforum.com/showthread.php?t=1510698

Reference NO 7

http://www.techrepublic.com/blog/linux-and-open-source/use-wireshark-to-inspect-packets-on-your-network/

Reference NO 8

http://russell.ballestrini.net/how-to-capture-https-ssl-tls-packets-with-wireshark/