Network+

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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


firewall


security policy


IP proxy


skipjack


IP spoofing


state table


key


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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