CEH v13 312-50v13 Book

MX (Mail Exchange) records in DNS define the mail servers responsible for receiving email for a domain. Each MX record has a priority value.

Important concept:

A lower number indicates a higher priority.

Email servers attempt delivery to the mail server with the lowest priority first.

For example:

If MX records are:

10 mail1.example.com

20 mail2.example.com

Then mail1 will be tried first. If it fails, mail2 will be used.

So the statement “MX record priority increases as the number increases” is false.

Comprehensive and Detailed Explanation:

Blind SQL injection is used when the application does not return errors or display query results. In such cases, attackers use inference methods such as:

Boolean-based queries

Time-based queries (e.g., using SLEEP or WAITFOR DELAY)

Elliot’s use of timing delays indicates a time-based blind SQL injection.

From CEH v13 Courseware:

Module 10: Web Application Hacking → SQL Injection Types

In CEH v13 Module 03: Scanning Networks, Nmap includes timing templates for controlling the speed and stealthiness of scans.

-T5: Insane mode – very fast, highly aggressive, easily detectable.

-T0: Paranoid mode – very slow and stealthy.

-O: Enables OS detection (not related to scan speed).

-A: Enables OS detection, version detection, script scanning, and traceroute (comprehensive but not specifically about speed).

Therefore:

If speed is your goal and you are not concerned about detection, then:

-T5 is the correct answer.

Comprehensive and Detailed Explanation:

Fake antivirus (also known as scareware) tricks users into downloading malware disguised as legitimate antivirus software.

The best approach:

Google the product name and URL.

Check reputable forums, antivirus vendors, or security advisories.

Look for phishing warnings or reports of malware.

From CEH v13 Courseware:

Module 7: Social Engineering and Phishing Scams

Module 6: Malware Threats → Rogue Software