Mike Meyers' CompTIA Security+ Certification Guide (Exam SY0-501) by Mike Meyers

Author:Mike Meyers
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2018-03-13T04:00:00+00:00

Host Availability and Elasticity

Virtual environments offer organizations real flexibility in the use of their infrastructure for both availability and elasticity. Virtualization supports availability in that you can almost instantly duplicate production hosts (whether physical or virtual) in a virtual environment, adding redundant capabilities for availability purposes or assets for use when existing hosts aren’t enough. You can copy physical machines and convert them to virtual machines and, because virtual machines are merely files, you can copy and reinstantiate them as new additional virtual machines (with a few basic configuration changes, of course).

Virtualization provides elasticity, meaning you can expand, duplicate, reconfigure, repurpose, and reuse resources in the environment (in this case, virtual hosts) on the fly, as the need for them arises or shrinks. This provides an organization flexibility in its use of resources, saving physical machines and reallocating, activating, and deactivating hosts as needed in dynamic-use situations. Virtual machines can be provisioned, configured, and stored in advance for just such instances.

Virtualization applies to networking components as well, enabling rapid scalability and adaptability of networks of virtual machines. Software defined networking (SDN) enables centralization of portions of the routing and switching (such as creation and maintaining of routing tables), that can then be rapidly pushed to routers and switches that only handle the packets and frames. Current SDN boxes employ security features that can rapidly respond, automatically, to attacks such as distributed denial-of-service (DDoS) attacks.

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