1. Which security service(s) are guaranteed when using each of the following methods to send mail at the post office?

a. Regular mail

b. Regular mail with delivery confirmation

c. Regular mail with delivery and recipient signature

d. Certified mail

e. Insured mail

f. Registration mail

2. Which security mechanism(s) are provided in each of the following cases?

1. A school demands student identification and a password to let students log into the school server.

2. A school server disconnects a student if she is logged into the system for more than two hours.

3. A professor refuses to send students their grades by e-mail unless they provide student identification they were pre-assigned by the professor.

4. A bank requires the customer