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By default, Windows 2000 provides three predefined security policies that will satisfy most cases You can also start with one of these predefined policies and customize it to fit your needs Client (Respond Only) This policy instructs the computer to use IPSec when requested to do so by another computer The computer with this policy does not request IPSec when it initiates communications and will normally not use it Therefore, this policy is for computers that contain little or no sensitive data Server (Requests Security) This policy is for servers that should use IPSec if possible but should

Now that you know how your system knows the DNS server s IP address, let s return to the DNS process The DNS server receives the request for the IP address of wwwmicrosoftcom from your client computer At this point, your DNS server checks a cache of previously resolved FQDNs to see if wwwmicrosoftcom is there (Figure 10-18) In this case, wwwmicrosoftcom is not in the cache

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Cache Type SOA NS A SOA A NS Name mailtotalsemcom ns1fredcom wwwgooglecom enwikipediaorg wwwusagov ns1blahblahcom IP 2012585 523819842 1476215108 85145268 68722149 8510418972

not deny communication if the client does not support IPSec This policy is useful in environments in which not all the clients can use IPSec for example, during a migration to Windows 2000 If total security is required, the Secure Server policy (described next) should be used Secure Server (Requires Security) For your servers that contain sensitive data, this policy requires use of IPSec for all clients All outgoing communications are secured, and all unsecured requests from clients are rejected Choosing the right security policy requires careful assessment of the nature of the data Indiscriminately assigning the highest level of security for all users and servers will put unnecessary strain on the servers and clients' workstations because of the overhead for encrypting and decrypting all network traffic On the other hand, allowing any type of client to connect to a secure server would endanger secure information NoteSetting up a security policy between users and domain controllers is not necessary, because their communication is already encrypted when required using Kerberos v5

Figure 10-18

for n = 1, 2, 3,

This version is the workhorse of the network Windows 2000 Server Standard Edition is a file and print server that can run as a domain controller (DC) with Active Directory It also supports all of the BackOffice line of applications, including Transaction Server, IIS, Exchange, SQL Server, and so on Server Standard Edition can run DNS, DHCP, and WINS services This version is, of course, what NT Server was in the NT 40 world It supports up to four-way symmetric multiprocessing (SMP) and 4GB of physical memory

It s now time for your DNS server to get to work The local DNS server may not know the address for wwwmicrosoftcom, but it does know the addresses of the DNS root servers The root servers, maintained by InterNIC, know all the addresses of the top-level domain DNS servers The root servers don t know the address of wwwmicrosoftcom, but they do know the address of the DNS servers in charge of all com addresses The root servers send your DNS server an IP address for a com server (Figure 10-19)

The Advanced Server version is, in general, an evolution of Windows NT 40 Server, Enterprise Edition Enterprise Edition came about with the development of the Microsoft clustering service This allowed two NT 40 servers to operate in tandem, so that if one failed, the other picked up the extra work without a hiccup Windows 2000 Advanced Server extends this clustering service even further and can support up to 8GB of physical memory, and eight-way SMP

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1 B Hubs are nothing more than multiport repeaters 2 C All Ethernet frames begin with a preamble 3 C 10BaseT uses a star-bus topology 4 B The maximum distance between a 10BaseT node and its hub is 100 meters 5 B UTP cable uses an RJ-45 connector when used for Ethernet RG-58 is the type of coaxial cable used with 10Base2 RJ-11 is the standard four-wire connector used for regular phone lines RS-232 is a standard for serial connectors 6 A A 10BaseT hub can connect no more than 1024 nodes (computers)

Windows 2000 Datacenter is really the same as the Advanced Server version with some additional scalability enhancements It can support up to 64GB of physical memory and up to 32-way SMP A few years ago, it would have been almost impossible to imagine that such CPU horsepower would be harnessed by a Windows operating system It won't be long, however, before groups of these servers are commonly used for extremely intensive applications (scientific modeling, financial transactions, and Web hosting for a large site, for example), displacing mainframes, minis, and UNIX-based systems