CEHPC Exam Dumps : Ethical Hacking Professional Certification Exam

Active reconnaissance is a phase of ethical hacking in which information is gathered bydirectly interacting with the target system. This makes option C the correct answer. Unlike passive reconnaissance, active reconnaissance involves sending requests, probes, or packets to the target to elicit responses that reveal useful technical details.

Common active reconnaissance techniques includeport scanning,service enumeration,banner grabbing,DNS queries, andnetwork mapping. These methods help ethical hackers identify open ports, running services, operating systems, and potential vulnerabilities. Active reconnaissance is typically conducted after passive techniques have provided initial intelligence.

Option A is incorrect because recognizing a target without action does not describe reconnaissance behavior. Option B is also incorrect because observing without interaction definespassive reconnaissance, not active reconnaissance.

From an ethical hacking perspective, active reconnaissance is more intrusive and therefore more likely to be detected by intrusion detection systems or firewalls. Because of this, it must always be performed withexplicit authorization. Despite the increased risk of detection, active reconnaissance provides far more accurate and actionable information, making it essential for effective penetration testing.

Understanding the distinction between active and passive reconnaissance helps security professionals choose the correct techniques based on scope, authorization, and risk tolerance. Properly managed, active reconnaissance enables organizations to identify weaknesses early and strengthen their defensive security posture.

A firewall is a cornerstone master information security control that serves as a protective barrier between a trusted internal network and untrusted external networks, such as the internet. Its primary function is to monitor and control incoming and outgoing network traffic based on a predetermined set of security rules. By analyzing packet headers—specifically IP addresses, port numbers, and protocols—the firewall determines whether to "allow," "block," or "drop" a connection attempt.

Firewalls can be implemented as hardware appliances, software installed on a host, or a combination of both. They generally fall into several categories:

Packet Filtering Firewalls: These examine individual packets in isolation and are the most basic form of protection.

Stateful Inspection Firewalls: These track the state of active connections, ensuring that incoming traffic is only allowed if it is a response to a legitimate outgoing request.

Next-Generation Firewalls (NGFW): These go beyond simple port/IP filtering by performing "Deep Packet Inspection" (DPI) to identify specific applications and even filter out malware or malicious commands within the traffic.

In the pentesting process, the firewall is the first major obstacle a tester encounters. It defines the "perimeter" of the organization. An ethical hacker will use port scanning to identify which "holes" exist in the firewall's ruleset. For defenders, a properly configured firewall is essential for implementing "Default Deny" policies, where all traffic is blocked unless it is explicitly permitted. This significantly reduces the attack surface by ensuring that services like database ports are never exposed to the public internet. While a firewall is not a substitute for antivirus (Option A) or an exploit method (Option B), it is the most vital tool for regulating network access and preventing unauthorized intrusions.

Social engineering is a non-technical method of intrusion that relies heavily on human interaction and involves tricking people into breaking normal security procedures. Unlike traditional hacking, which targets software or hardware vulnerabilities, social engineering exploits human psychology—specifically the natural tendency to trust or the desire to be helpful. The process typically begins with an attacker assuming a deceptive persona, such as a helpful IT support technician, a trusted colleague, or an authoritative figure like a company executive. By establishing a rapport or creating a sense of urgency, the attacker builds a bridge of "trust" with the victim.

Once this psychological foothold is established, the attacker manipulates the victim into performing actions that compromise security. This might include revealing confidential login credentials, transferring funds to fraudulent accounts, or providing sensitive internal information about a network’s architecture. Common tactics include "phishing" (sending deceptive emails), "vishing" (voice solicitation over the phone), and "pretexting" (creating a fabricated scenario to obtain info).

In a professional ethical hacking engagement, social engineering testing is critical because it highlights that a company’s security is only as strong as its weakest human link. No matter how robust the firewalls or encryption methods are, they can be bypassed if an employee is manipulated into "opening the door" for an adversary. Effective defenses against social engineering do not rely solely on technology but on continuous employee awareness training and the implementation of strict verification protocols for any request involving sensitive data.