Network Security

1.) In no less than 250 words, describe a type of email threat and how a hacker can use it to get sensitive information.  How can a network administrator prevent this type of attach from happening?

2.) Answer Below Questions:

2.1 What is the difference between RFC 5321 and RFC 5322?

2.2 What are the SMTP and MIME standards?

2.3 What is the difference between a MIME content type and a MIME transfer encoding?

2.4 Briefly explain base64 encoding.

2.5 Why is base64 conversion useful for an e-mail application?

2.6 What is S/MIME?

2.7 What are the four principal services provided by S/MIME?

2.8 What is the utility of a detached signature?

2.9 What is DKIM?