A network administrator recently updated various network devices to ensure redundancy throughout the
network. If an interface on any of the Layer 3 devices were to go down, traffic will still pass through
another interface and the production environment would be unaffected. This type of configuration
represents which of the following concepts?

A.
High availability

B.
Load balancing

C.
Backout contingency plan

D.
Clustering

Explanation:
High availability (HA) refers to the measures used to keep services and systems operational during an
outage. In short, the goal is to provide all services to all users, where they need them and when they need
them. With high availability, the goal is to have key services available 99.999 percent of the time (also
known as five nines availability).Incorrect Answers:
B: Load balancing is one of the ways that high availability can be obtained because it allows you to split
the workload across multiple computers
C: Backout contingency plan is a reversion from a change that had negative consequences.
D: Clustering is done whenever you connect multiple computers to work and act together as a single
server. It is meant to utilize parallel processing and can also add to redundancy.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 32, 443