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.
Incorrect Answers:
A: The terms protocol analyzing and packet sniffing are interchangeable. They refer to the process of monitoring the data that is transmitted across a network.
C: A VPN concentrator is a hardware device used to create remote access VPNs. The concentrator creates encrypted tunnel sessions between hosts, and many
use two-factor authentication for additional security.
D: One of the newest buzzwords is web security gateway, which can be thought of as a proxy server (performing proxy and caching functions) with web protection
software built in. Depending on the vendor, the “web protection” can range from a standard virus scanner on incoming packets to monitoring outgoing user traffic
for red flags as well.

Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, Sixth Edition, Sybex, Indianapolis, 2014, pp 103, 104, 118.