Question

Which software prevents the external access to a system?

• A. FTTR
• B. Gateway
• C. Firewall
• D. Virus Checker

Hint:

A properly configured firewall can block harmful traffic and allow only legitimate connections to pass through, acting as the first line of defense against external cyber threats.

Answer 1

The Correct Option is C

The correct answer is Firewall.
A firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted internal network (such as a corporate network) and untrusted external networks (such as the internet), preventing unauthorized access to the system. Firewalls can be hardware- or software-based and are commonly used to prevent malicious attacks, data breaches, and unauthorized external access. Firewalls function by filtering traffic based on IP addresses, port numbers, and other protocol details. They can also block or allow traffic based on specific applications or services, and in some cases, they also provide intrusion detection and prevention.
Explanation of Other Options:
(A) FTTR:
FTTR (Fiber to the Router) is not a software solution and has nothing to do with preventing external access to a system. FTTR is a type of internet connectivity service, and it refers to the use of fiber optic cables to connect the internet to a router. It does not provide security against external access.
(B) Gateway:
AGateway is a network device that serves as a bridge between different networks. While it can route traffic between networks, a gateway does not inherently provide security to prevent external access. It may perform some filtering or translation but does not function as a full-fledged firewall.
(D) Virus Checker:
AVirus Checker, also known as antivirus software, is used to detect and remove malicious software (viruses, malware, etc.) on a system. However, it does not prevent external access to a system. It is designed to protect against threats that have already penetrated the system, not to prevent unauthorized access from external sources.
Summary:
- A Firewall is the software designed to block unauthorized external access to a system and protect the network.
-FTTR andGateway are related to network connectivity and routing, not security.
-Virus Checker protects the system from internal threats but does not block external access.