Which of the following devices is used for the transparent security inspection of network traffic by
redirecting user packets prior to sending the packets to the intended destination?

A.
Proxies

B.
Load balancers

C.
Protocol analyzer

D.
VPN concentrator

Explanation:
A proxy is a device that acts on behalf of other(s). A commonly used proxy in computer networks
is a web proxy. Web proxy functionality is often combined into a proxy firewall.
A proxy firewall can be thought of as an intermediary between your network and any other
network. Proxy firewalls are used to process requests from an outside network; the proxy firewall
examines the data and makes rule-based decisions about whether the request should be
forwarded or refused. The proxy intercepts all of the packets and reprocesses them for use
internally. This process includes hiding IP addresses.
The proxy firewall provides better security than packet filtering because of the increased
intelligence that a proxy firewall offers. Requests from internal network users are routed through
the proxy. The proxy, in turn, repackages the request and sends it along, thereby isolating the user
from the external network. The proxy can also offer caching, should the same request be made
again, and it can increase the efficiency of data delivery.