You work as an Exchange Administrator for TechWorld Inc. The company has a Windows 2008 Active Directory-based network. The network contains an Exchange Server 2010 organization. You are in the process of choosing an authentication method for Exchange ActiveSync. You need an authentication method that requires both, a password an external device. Which of the following authentication methods will you choose for Exchange ActiveSync?

Humongous Insurance is an online healthcare insurance company. During an annual security audit a security firm tests the strength of the company's password policy and suggests that Humongous Insurance implement password history policy.
What is the likely reason that the security firm suggests this?

Media Access Control (MAC) filtering enables you to:

E-mail spoofing:

How does the sender policy framework (SPF) aim to reduce spoofed email?