What is a VLAN and what problem does it solve in an Army network?

What is a VLAN and what problem does it solve in an Army network?

• A. A virtual network service used for email routing.
• B. A hardware device that filters traffic.
• C. A virtual local area network that segments networks logically to improve security and traffic management.
• D. A cloud storage service.

Answer: (C)

VLAN stands for Virtual Local Area Network. It logically segments a single physical network into multiple broadcast domains to improve security and traffic management. By keeping broadcasts within each VLAN, unnecessary traffic is reduced and devices can be grouped by function, location, or security level even when they share the same switches and cables. In Army networks, this segmentation helps isolate sensitive systems from general user devices, making policy enforcement simpler and enhancing overall security and agility across bases and theaters. If devices need to communicate across VLANs, inter-VLAN routing via a router or layer-3 switch is used, with traffic carefully controlled and logged. VLAN tagging (such as 802.1Q) allows switches to carry multiple VLANs over a single trunk link, enabling scalable, flexible designs. It’s not a service for email routing, not a hardware device, and not cloud storage.

VLAN stands for Virtual Local Area Network. It logically segments a single physical network into multiple broadcast domains to improve security and traffic management. By keeping broadcasts within each VLAN, unnecessary traffic is reduced and devices can be grouped by function, location, or security level even when they share the same switches and cables. In Army networks, this segmentation helps isolate sensitive systems from general user devices, making policy enforcement simpler and enhancing overall security and agility across bases and theaters. If devices need to communicate across VLANs, inter-VLAN routing via a router or layer-3 switch is used, with traffic carefully controlled and logged. VLAN tagging (such as 802.1Q) allows switches to carry multiple VLANs over a single trunk link, enabling scalable, flexible designs. It’s not a service for email routing, not a hardware device, and not cloud storage.