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tems, including Windows Server 2000, support IPSec NAT-T Therefore, lack of support should not be a major concern if an organization wants to deploy IPSec-based solutions on Windows platforms If third-party interoperability is needed, make sure that the third-party vendor has successfully implemented draft 02 of the IETF IPSec NAT-T specifications With Windows Server 2003, you can use IPSec transport mode within a PPTP tun nel to get extremely powerful encryption services while also maintaining the ability to send information through NATs The Microsoft implementation of PPTP since Windows 2000 adds security enhancements while preserving the other useful prop erties of PPTP, primarily through the addition of support for MS-CHAP v2 and EAP These enhancements provide the ability to use smart cards and public-key certifi cates to strengthen both user authentication and encryption keys This strengthens protection against both user impersonation and brute-force decryption of inter cepted packets.

You can use algebraic identities to replace costly operations with cheaper ones. For example, the following expressions are logically equivalent:

Exam Tip For the exam, know the operations performed by the Repair button and their command-line equivalents.

When the Ipconfig /all command output or the connection status dialog box reveals that the client address is assigned by APIPA or by an alternate configuration, you can first attempt to refresh the IP configuration by using either the Ipconfig /renew com mand or the Repair button in the connection s status dialog box. If the problem persists, this situation can signal either the absence of a DHCP server or relay agent deployed within broadcast range, a break in the physical connection, or an error at the DHCP server or scope. If you can verify that a DHCP server or relay agent is deployed within broadcast range, verify next that the physical connection to the

not a and not B not (a or B)

8-31

As a result, PPTP can be a useful alternative or complement to L2TP/IPSec-based VPNs To maintain the proper level of security with PPTP, make sure to implement strong password policy with the use of PPTP SSL VPN: Where Is Its Place in the VPN Market One of the new technologies making a stir in the remote access market is SSL (Secure Sockets Layer) VPN Instead of using standard tunneling protocols such as PPTP or L2TP/IPSec, SSL VPN takes advantage of SSL Internet encap sulation to punch through firewalls over Transmission Control Protocol (TCP) port 443, the port that is usually open to allow for SSL-encrypted communica tions to Web sites.

If you choose the second expression instead of the first, you can save a not operation. Although the savings from avoiding a single not operation are probably inconsequential, the general principle is powerful. Jon Bentley describes a program that tested whether sqrt(x) < sqrt(y) (1982). Since sqrt(x) is less than sqrt(y) only when x is less than y, you can replace the first test with x < y. Given the cost of the sqrt() routine, you d expect the savings to be dramatic, and they are. Here are the results:

DHCP server or relay agent is functioning properly. Note that to ping the DHCP server or relay agent successfully, you might need to assign a temporary manual address that places the client on the same logical subnet as its default gateway.

If you do not know the location, address, or name of a DHCP server on your network, enter netsh dhcp show server at a command prompt. This command provides you with the names and addresses of all servers authorized in Active Directory.

Time Savings 99.9% 95% 90%

Once you can rule out problems in physical connectivity, and if you can rule out prob lems in the configuration or status of the DHCP relay agent (if deployed), you can move on to troubleshoot the DHCP server and scope. When troubleshooting the DHCP server for the client s failure to obtain an IP address, verify that the server is fully installed, configured, and authorized. When troubleshooting the scope for the client s failure to obtain an IP address, verify that the scope is active and that the available leases have not all been assigned to other clients. (See the Verifying the Server Configuration section later in this lesson for more information on troubleshooting these problems at the server and scope.)