1. The OP is not concerned with running out of addresses.
2. This is not a publicly addressed WAN, it's a privately addressed LAN.
3. /30 is unarguably a more common approach.
4. /30 is the "right" answer for the CCNA.
1. Who Gives a shit
2. Again See #1
3. Depends on who you are. You will see alot of people like you that will use /30 because its with in your comfort level. You will see people that work in isp's or have came from an isp environments use /31. Neither is wrong, both will work
4. When did this turn into anything about CCNA. OP is looking for a way to implement a 3560. So again see #1
There is no right or wrong answer here. So put your e-penis away and stop pushing what you think is the right answer.