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When a DHCP server is available, computers that have been configured to obtain an IP address automatically, on booting, request and receive their IP configuration from that DHCP server. DHCP servers must be authorized if they are to be made available in Active Direc tory networks. A DHCP scope is a continuous range of IP addresses, defined within a single logical subnet, that the DHCP server can assign to clients. After you define and configure a scope, the scope must be activated before the DHCP server can begin providing ser vice to clients. An exclusion range is a set of one or more IP addresses, included within the range of a defined scope, that you do not want to lease to DHCP clients. You use a res ervation to create a permanent address lease assignment by the DHCP server. DHCP options provide clients with additional configuration data, such as the addresses of a client s default gateway or DNS server, along with an address lease.

9 several rules of good pro-

7-22

A. PPTP provides a level of security that is suitable for most companies, and, because of the security model it uses, it has benefits that L2TP/IPSec and other IPSec-based VPN solutions don t have. Even though IPSec offers powerful security features, the deployments are usually more costly and have limitations. One benefit of PPTP is that it does not require a certificate infrastructure, which many organizations are not ready to deploy. Rather, it relies on a user s logon credentials to establish trust to connect the tunnel and to create the encryption keys for the session. Additionally, the process for managing user names and passwords is well known. For customers who want stronger security than user passwords, PPTP can be used with EAP so that smart cards or token cards can be used for authentication. This increases the strength of the encryption key generation and reduces the risk of dictionary attacks. In addition, PPTP can be used with most network address translators (NATs), with no modifications required for either the client or server. IPSec traffic, on the other hand, cannot traverse a NAT unless both the client and server support IPSec NAT traversal (IPSec NAT-T). Until certificate infrastructure becomes ubiquitous and IPSec product implementations are updated to support IPSec NAT-T, PPTP will remain an important protocol choice for many customers.

7

maintenance are usually more important than execution speed or size, but in this chapter the topic is performance, and that implies a tradeoff with the other objectives. You ll see many examples of coding practices here that aren t recommended in other parts of this book.

In an enterprise environment, managing DHCP service requires you to perform a broad range of functions, from changing the status of a DHCP server, to backing up the server, to using command-line tools to configure a DHCP server from over wide area network (WAN) links. In addition, enterprise networks often include various topology restrictions or other practical limitations requiring situational design adjustments in DHCP service. Effective DHCP administrators need to be able to handle these adjust ments, such as providing DHCP service through routers or configuring more than one logical subnet on a single physical network segment.

Disable the DHCP Server service Use the Netshell (Netsh) command-line environment to administer the DHCP Server

Would you guess that these lines are faster or slower than the following 10 lines that do the same job

Q. Are IPSec-based VPN connections compatible with network address translators (NAT)

Change the addressing of a subnet for which the DHCP Server service is configured Back up and restore the DHCP server database Move a DHCP server Manually compact a DHCP server database Use options classes to configure a subset of DHCP clients with specific options

a[ 1 ] = 1 a[ 2 ] = 2 a[ 3 ] = 3 a[ 4 ] = 4 a[ 5 ] = 5 a[ 6 ] = 6 a[ 7 ] = 7 a[ 8 ] = 8 a[ 9 ] = 9 a[ 10 ] = 10

You can use various tools to start or stop the DHCP Server service: the DHCP console, the command-line interface, and the Services console.

Within the DHCP console, the Action menu that appears when the server icon is selected contains an All Tasks submenu that includes the options Start, Stop, Pause, Resume, and Restart. This same Action menu and All Tasks submenu also appear in the DHCP console when you right-click the DHCP server icon. To start or stop a DHCP server, complete the following steps: 1. Open the DHCP console.