Which of the following technologies is designed to keep systems uptime running in the event of a disaster?

A.
High availability

B.
Load balancing

C.
Quality of service

D.
Caching engines

Explanation:
If a network switch or router stops operating correctly (meaning that a network fault occurs), communication
through the network could be disrupted, resulting in a network becoming unavailable to its users. Therefore,
network availability, called uptime, is a major design consideration.