What?

Where by "T-Ball questions", I mean, relatively easy (compared to a lot of our crazy-hard-troubleshooting questions) questions which have a clear answer. This would be in the "most professionals know this". (Obviously some may not know it if it's outside their usual domain.)

Examples

Diff between IKE and ISAKMP (which is one on which I've scored a lot for an upvoted answer.)
What exactly is SDN?
Is Ethernet a protocol

Encourage or Discourage?

Should they be...?