CompTIA Network+

Answer: C, E - Multiple devices implemented in the same network that perform the same operations simultaneously offer Load Balancing and High Availability.

Key takeaway: Having multiple devices that perform the same operations simultaneously offer redundancy for the network. The load balancing stems from the devices performing the same operations simultaneously minimizing over use of those devices. Multiple devices allows for any downtime occurring on either device for updates, maintenance, or otherwise, to not affect the overall availability of services. In this example neither QoS, content filtering, nor traffic shaping are playing any significant part.