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15.    B. This question is similar to question #14; however, in this case, the protocols match. Because the server and workstation are both running the same protocol (TCP/IP) and there is a connection between them, they can both communicate.

16.    C. In exactly the same situation as question #15, both the workstation and the server are running the same protocol and the server has IP routing installed. Thus, the workstation can communicate with the server over the POTS line. And because routing is installed, the workstation can communicate with the entire network.

17.    D. ISDN is a digital services network. There is no such thing as analog ISDN.

18.    A. Because PPP doesn’t contain a Physical layer specification as part of the protocol, it can run over any kind of medium.

19.    B. The Point-to-Point Tunneling Protocol (PPTP) allows you to create a secure virtual connection between two points by tunneling one protocol inside another. Usually, a PPP connection is opened over a TCP/IP link.

20.    C. Every COM port is assigned a default I/O port. The default I/O port of COM 3 is 3E8.



Network Access and Security


S 3.8 Identify the purpose, benefits, and characteristics of using a firewall.

S 3.9 Identify the purpose, benefits, and characteristics of using a proxy.

S 3.10 Given a scenario, predict the impact of a particular security implementation on network functionality (e.g., blocking port numbers, encryption, etc.).

here are two prerequisites that you should keep in mind when you access a resource on the network: network access and the proper security clearance. These items work together to allow you access to a particular resource.

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