Explanation
Screened subnets are demilitarized zones (DMZs) and are oriented toward preventing attacks on an internal network by external users. The policies and procedures to classify information will ultimately result in better protection but they will not prevent actual modification. Role-based access controls would help ensure that users only had access to files and systems appropriate for their job role. Intrusion detection systems (IDS) are useful to detect invalid attempts but they will not prevent attempts.

Explanation/Reference:
Explanation:
Digital signatures ensure that transmitted information can be attributed to the named sender; this provides nonrepudiation. Steganographic techniques are used to hide messages or data within other files. Biometric and two-factor authentication is not generally used to protect internet data transmissions.

Section: INCIDENT MANAGEMENT AND RESPONSE

Section: INCIDENT MANAGEMENT AND RESPONSE
Explanation:
The key step in such an incident is to report it to mitigate any loss. After this, the other actions should follow.