Cisco Certified Network Associate (CCNA) Practice Exam

What is one benefit of implementing VLANs in a network?

1. Increased number of collision domains

2. Higher level of network security

3. Reduced network traffic

4. Decreased number of broadcast domains

The correct answer is: Higher level of network security

Implementing VLANs (Virtual Local Area Networks) in a network indeed enhances the level of network security. By segmenting the network into different VLANs, devices within one VLAN cannot directly communicate with devices in another VLAN without proper routing. This separation helps to limit access to sensitive information and reduces the chances of unauthorized access, ensuring that only users with the appropriate permissions can reach certain resources. This increased level of security is particularly beneficial in environments where different departments or user groups need distinct access rights. For example, a company's finance department can be placed in one VLAN, while the HR department is in another, ensuring that sensitive financial data is not accessible to HR staff. While VLANs do increase the number of collision domains and reduce broadcast domains, these aspects relate more to performance and efficiency rather than security. Similarly, while they can help in managing traffic effectively, the primary benefit highlighted in this context pertains to securing sensitive network resources.