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Be able to identify the different types of proxy servers. A proxy server acts on behalf of a client. Most often, a proxy server is characterized by the service or protocol it is “proxying” (e.g., HTTP proxy for HTTP requests).

Be able to predict the impact of implementing a particular security scenario on network functionality. Any increase in network security decreases the speed of a user’s network access because they have one more

level of security to get through before they can do their job. Therefore, the tighter the security, the less functionality you can get out of a network, but the more network stability you will achieve.

Be able to differentiate between a proxy and Network Address Translation (NAT). Proxy servers act on behalf of a client, whereas NAT simply changes “from” addresses as the packets pass through the proxy server.

Key Terms

^^efore you take the exam, be certain you are familiar with the following terms:

clipper chip

Ping of Death

denial of service (DoS) attack

private network

dynamic packet filtering

proxy cache server

dynamic state list

proxy servers

encryption key

public network


security policy

IP proxy


IP spoofing

state table


symmetrical keys

Network Address Translation (NAT)

SYN flood

packet filtering

web proxies

password history

Review Questions

1.    Which of the following is an appropriate name for the network administration account?

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