N10-005 Question #836: Real Exam Question with Answer & Explanation

The correct answer is D: Implicit deny. Implicit deny is a fundamental firewall principle: any traffic not explicitly permitted by a rule is denied by default. The absence of a block rule does not mean traffic is allowed - firewalls require an explicit allow rule for traffic to pass. Since there is no rule permitting R

Question

A user is unable to connect to a remote computer using RDP. The technician checks the firewall rules and notes that there is no rule that blocks RDP. Which of the following features of the firewall is responsible for blocking RDP?

Options

AStateful inspection
BNAT/PAT
CPort security
DImplicit deny

Explanation

Implicit deny is a fundamental firewall principle: any traffic not explicitly permitted by a rule is denied by default. The absence of a block rule does not mean traffic is allowed - firewalls require an explicit allow rule for traffic to pass. Since there is no rule permitting RDP (TCP port 3389), the implicit deny at the end of the rule set drops the connection. Stateful inspection tracks active connection state. NAT/PAT translates addresses and ports but does not make allow/deny decisions here. Port security is a Layer 2 switch feature that limits MAC addresses per port.

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