CompTIA Cloud+ Practice Test

Which technology can create more than 16 million isolated virtual networks?

1. VXLAN

2. VLAN

3. MPLS

4. VPN

The correct answer is: VXLAN

The technology that can create more than 16 million isolated virtual networks is VXLAN, which stands for Virtual Extensible Local Area Network. VXLAN is a network virtualization technology that encapsulates Layer 2 Ethernet frames within Layer 4 UDP packets. This encapsulation provides a flexible framework for connecting different virtual networks across a Layer 3 infrastructure, which is particularly beneficial in large-scale data centers. One of the key features of VXLAN is its ability to use a 24-bit segment ID, called the VXLAN Network Identifier (VNI). This allows for the creation of up to 16 million unique identifiers, which translates to the capability to establish over 16 million isolated virtual networks. This is advantageous for multi-tenant cloud environments where isolation between tenant networks is crucial. In contrast, VLANs (Virtual Local Area Networks) use a 12-bit VLAN ID, which limits the number of available VLANs to 4096. While MPLS (Multiprotocol Label Switching) and VPN (Virtual Private Network) technologies serve different roles in network management and security, they do not provide the same level of network isolation capability as VXLAN. Thus, VXLAN is particularly suited for scenarios that require a large number of isolated networks, making it the correct