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Network-based A network-based IDS operates on a network. It looks at data passing through the network and compares it against certain signatures, similar to how an antivirus program works. An alarm is sounded when a signature matches or if something doesn t seem right.

4

Note A firewall is not a foolproof way to protect a network. Firewalls add protection but do not guarantee that an intruder will not bypass its security. The only way to ensure a network is impregnable is to unplug the network cable from the wall. As a network administrator, you cannot keep someone from entering your network, but you can use an Intrusion Detection System to warn you when an intruder does enter your network. You can implement a countermeasure after such an occurrence.

You could import this file into Active Directory using the command:

The Ldifde command allows you to import and export accounts using Lightweight Directory Access Protocol (LDAP) file formats. It is explained in the Windows Help And Support Center (search for Ldifde ). Figure 4-3 lists the primary commands used with Ldifde displayed by typing ldifde / at the command prompt.

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Firewalls may be used to protect your internal network from the outside, but suppose you want outsiders to access your company s Web server or email servers You can place these servers in an area outside your private, internal network. A perimeter network is a small network that is accessible to external users, but does not allow these users to access your internal network. Figure 8-5 illustrates how a perimeter network can do just that.

Adding members to a dynamic distribution group is one of the tasks that you would normally do with a CLI rather than a GUI because it is repetitive and can be scripted. 5 discusses scripts in detail. For example, to add the user Don Hall to the universal distribution group Sales, use the command Add-DistributionGroupMember Sales Member "Don Hall".

The two most important switches for the Ldifde command are:

Notice that the outside users have to go through a firewall to access the Web server and e-mail server, and two firewalls must be entered before accessing the internal private network. The firewalls in the illustration could be Internet Security and Acceleration (ISA) servers or another type of firewall.

For example, the following command will import objects from the file named Groups.ldf:

4-17

8-21

Table 4-4

Ldifde Commands (Primary)

As you have learned in the previous chapters, documentation of your network infrastructure design is one of the most important aspects of an administrator s job. Documenting your perimeter network infrastructure is no different. In fact, this is probably the most important of all of your documentation because this may affect the security and protection of your company s resources. As you have learned, the perimeter network contains servers that do not host any crit ical or proprietary information on them. These servers should be free of Social Security numbers, credit card numbers, marketing plans for the business, and so forth. The perimeter network should house the servers you want outsiders to connect to while limiting access to your company s internal network.

To list the members of a universal distribution group, you would use the GetDistributionGroupMembers cmdlet, for example, Get-DistributionGroupMember Sales.

General parameters -i -f filename -s servername -c FromDN ToDN -v -j path -t port - -d RootDN -r Filter -p SearchScope -l list -o list -g -m -n -k Turn on Import mode (The default is Export) Input or Output filename The server to bind to Replace occurrences of FromDN to ToDN Turn on Verbose mode Log File Location Port Number (default = 389) Help The root of the LDAP search (Default to Naming Context) LDAP search filter (Default to (objectClass=*) ) Search Scope (Base/OneLevel/Subtree) List of attributes (comma-separated) to look for in an LDAP search List of attributes (comma-separated) to omit from input Disable paged search Enable the Security Accounts Manager (SAM) logic on export Do not export binary values The import will ignore Constraint Violation and Object Already Exists errors Sets the command to run using the supplied user distinguished name and password; for example: cn=administrator,dc=contoso,dc-com password Sets the command to run as username domain password; the default is to run using the credentials of the currently logged-on user

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