ISC2 Certified in Cybersecurity (CC)Network SecurityEasy
A small business wants to protect its internal network from unauthorized access while allowing employees to browse the internet. Which network device is primarily responsible for filtering incoming and outgoing network traffic based on a defined set of security rules?
- ASwitch
- BRouter
- CAccess Point
- DFirewall
Show answer & explanationAnswer & explanation
Correct answer: D. Firewall
A firewall is specifically designed to enforce security policies by controlling network traffic, making it the primary device for this protection.
Why the other options are wrong
- A. A switch connects devices within a local network but does not filter traffic based on security rules.
- B. A router connects different networks and directs traffic, but its primary function isn't security filtering.
- C. An access point allows wireless devices to connect to a wired network but does not provide traffic filtering.
Firewall
A network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
- Acts as a barrier between a trusted internal network and untrusted external networks.
- Filters traffic based on IP addresses, port numbers, and protocols.
- Can be hardware, software, or cloud-based.
Memory trick: Firewall Fights Foes, Router Routes Roads, Switch Shares Space, Access Adds Air.