Which of the following must be added to a VLANs gateway to i

Which of the following must be added to a vlans gateway to i - CompTIA-N10-009

Which of the following must be added to a VLAN’s gateway to improve the security of the VLAN?

Correct Answer: C. Access Control List (ACL)

Access Control List (ACL):
An ACL enhances the security of a VLAN by restricting and filtering traffic based on defined rules. It can control which devices or IP addresses are allowed to send or receive traffic through the VLAN's gateway. By applying ACLs to a VLAN gateway, you can:
- Permit or deny specific traffic types.
- Filter traffic based on protocols, IP addresses, or port numbers.
- Protect the VLAN from unauthorized access or malicious activity.

Why the other options are incorrect:

Spanning Tree Protocol (STP):
- STP prevents Layer 2 network loops by managing redundant paths in a switched network. It does not directly enhance the security of a VLAN's gateway.
Split Horizon:
- Split horizon prevents routing loops by stopping the propagation of routing information back over the interface from which it was learned. While important for routing, it does not improve VLAN security.
Hold Down Timer:
- Hold down timers are used in routing protocols to prevent flapping routes by suppressing updates for a specific period. This does not apply to VLAN security or traffic filtering.