Which of the following allows for logical isolation of hosts on a network?

The concept of logical isolation of hosts on a network is best exemplified by a Virtual Local Area Network (VLAN). VLANs allow network administrators to create distinct broadcast domains within a single physical network infrastructure. By segmenting the network in this way, traffic can be isolated based on different logical groups rather than physical locations. This improves security, performance, and management by reducing broadcast traffic and defining clear boundaries between different types of traffic.

VLANs achieve this by tagging the Ethernet frames with VLAN identifiers, allowing switches to segregate traffic based on these tags. As a result, devices within the same VLAN can communicate with one another as if they were on the same physical network, while devices in different VLANs are prevented from directly accessing each other's traffic, unless specifically configured to do so. This logical separation is critical in multi-tenant environments, such as data centers, where security and resource management are prioritized.

In contrast, the other options do not offer logical isolation of hosts in the same manner. DNS (Domain Name System) resolves domain names to IP addresses but does not provide isolation. TLS (Transport Layer Security) encrypts data for secure transmission but does not separate network segments. IPSec (Internet Protocol Security) secures IP communications but does not