Switch 100M refers to what, Wireshark grasping https__ small sum of knowledge

Today, the big guy asked my network things, forget a lot ... There are some problems, do a summary. If there is a mistake, forget the big guy points out.
1, the switch 100M is what meaning.

is 100M per port, and also a total of 100M, that is to share this 100M. But the end is not 100M, because there is loss.

2, about the Wireshark grab bag problem.

Why the connected wireless network, but the display Ethernet card is bright. Because the big guy connected wired, wireless in the connection. And then landing the wireless way to log in in fact, like PPPoE. Because the wireless to login to enter the account process with PPPoE instead. And then she walks alone. The port of a switch. So many of us are using an account to go to a switch port. In other words, they are average 50M.
To test, let the big guy pull the cable down. Sure enough, the wireless card is lit.
The big guy is awesome.
3, switch isolation conflict domain. The router isolates broadcast domains.

4, CSMA/CD is Half-duplex mode.

5, PPPoE after the landing of the IP subnet mask is 255.255.255.255.
Because it is a dial-up Internet. It's impossible to have a network segment with someone. Otherwise, more people can surf the internet. All is 255 limited only this one IP. But you can do NAT Ah ~
6, Wrieshark capture HTTPS ...
Originally can go to set, but even if caught is also ciphertext. Go to Google for the next. The original is to export the security certificate. Download OpenSSL and then export the secret key to Wireshark can be seen in HTTP2. Just theory, and didn't try. Be sure to try it yourself sometime.
Seen here: http://blog.csdn.net/cch5487614/article/details/6364711
7, Ping domain name returned to the IP address
8, large KB indicates byte small KB for bits. is uppercase lowercase b