GOOGLE PRE-SCREEN TEST!!

Below are the few questions which I was asked by GOOGLE pre-screen test. hope it should be helpful.

TCP/IP

1. How many bytes in a MAC address?
2. Which protocol is used by PING command?
3. How many hosts are available in /23 subnet?

UNIX

1. What is the purpose for setting STICKY BIT on directories?
2. What is the default signal send by KILL command?
3. Which UNIX part is taken care of storing files information in INODE?

Will update here once everything came to know.