Скачать в pdf «Network+»

Notice that each server type’s name consists of the type of service the server provides (remote access, for example) followed by the word “server,” which, as you remember, means to serve.

Regardless of the specific role (or roles) these servers play, they should all have the following in common:

■    Hardware and/or software for data integrity (such as backup hardware and software)

■    The capability to support a large number of clients

Figure 1.1, earlier in this chapter, shows a sample network. Physical resources, such as hard-drive space and memory, must be greater in a server than in a workstation because the server needs to provide services to many clients. Also, a server should be located in a physically secure area. Figure 1.2 shows a sample network that includes both workstations and servers. Note that there are more workstations than servers because a few servers can serve network resources to hundreds of users simultaneously.

FIGURE 1.2 A sample network including servers and workstations



If the physical access to a server is not controlled, you don’t have security. Use this guideline: If anybody can touch it, it isn’t secure. The value of the company data far exceeds the investment in computer hardware and software. We’ll look at network security in detail in Chapter 8, «Network Access and Security.»

Understanding Hosts

The term host is most commonly used when discussing TCP/IP related services and functions. A host, in TCP/IP terms, is any network device that has a TCP/IP network address. Workstations, servers, and any other network device (as long as it has TCP/IP addresses) can all be considered hosts. In conversation, you may also hear the word “host” used to describe any minicomputer or server. For the Network+ exam, however, you should stick to the classic definition used here.

Скачать в pdf «Network+»