Which of the following devices would be MOST useful to ensure availability when there are a large
number of requests to a certain website?

A.
Protocol analyzer

B.
Load balancer

C.
VPN concentrator

D.
Web security gateway

Explanation:
Load balancing refers to shifting a load from one device to another. A load balancer can be
implemented as a software or hardware solution, and it is usually associated with a device—a
router, a firewall, NAT appliance, and so on. In its most common implementation, a load balancer
splits the traffic intended for a website into individual requests that are then rotated to redundant
servers as they become available.