• Source: Network enclave

A network enclave is a section of an internal network that is subdivided from the rest of the network.




Purpose


The purpose of a network enclave is to limit internal access to a portion of a network. It is necessary when the set of resources differs from those of the general network surroundings. Typically, network enclaves are not publicly accessible. Internal accessibility is restricted through the use of internal firewalls, VLANs, network access control and VPNs.




Scenarios


Network Enclaves consist of standalone assets that do not interact with other information systems or networks. A major difference between a DMZ or demilitarized zone and a network enclave is a DMZ allows inbound and outbound traffic access, where firewall boundaries are traversed. In an enclave, firewall boundaries are not traversed. Enclave protection tools can be used to provide protection within specific security domains. These mechanisms are installed as part of an Intranet to connect networks that have similar security requirements.




DMZ within an enclave


A DMZ can be established within an enclave to host publicly accessible systems. The ideal design is to build the DMZ on a separate network interface of the enclave perimeter firewall. All DMZ traffic would be routed through the firewall for processing and the DMZ would still be kept separate from the rest of the protected network.




References

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