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    Which of the following is the system designed to prevent unauthorised access to or from a private network?
    Question

    Which of the following is the system designed to prevent unauthorised access to or from a private network?

    A.

    Repeater

    B.

    Packet filter

    C.

    Bridge

    D.

    Firewall

    Correct option is D

    The correct answer is: (D) Firewall
    Explanation:
    A firewall is a security system designed to prevent unauthorized access to or from a private network. It acts as a barrier between a trusted internal network and untrusted
    external networks (such as the internet), monitoring and controlling incoming and outgoing network traffic based on predefined security rules.
    Information Booster:
    • Firewalls can be hardware-based, software-based, or a combination of both.
    • They filter traffic based on IP addresses, ports, and protocols.
    • Types of firewalls include Packet Filtering Firewalls, Stateful Inspection Firewalls, and Proxy Firewalls.
    • Firewalls help prevent cyberattacks, hacking attempts, and unauthorized data access.
    • Modern firewalls incorporate Intrusion Detection and Prevention Systems (IDPS) for enhanced security.
    Additional Information:
    • Repeater : A network device that amplifies and retransmits signals to extend the range of a network.
    • Packet Filter : A type of firewall that examines packets based on rules.
    • Bridge : A networking device that connects two or more network segments.

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