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Some customers might also want support for advanced authentication technologies such as biomet rics (for example, retinal scans, fingerprints, and so forth) There needs to be a stan dard way to accommodate both legacy authentication as well as emerging authentication methods IPSec TM, as originally specified, supports only user authentication via user certifi cates or preshared keys However, most IPSec TM implementations support only the use of computer certificates or preshared keys L2TP leverages the Point-toPoint Protocol (PPP) as the method of negotiating user authentication As a result, L2TP can authenticate with legacy password-based systems through Password Authentication Protocol (PAP), Challenge-Handshake Authentication Protocol (CHAP), Microsoft Challenge-Handshake Authentication Protocol (MS-CHAP), or MS-CHAP version 2 (MS-CHAP v2) It can also support advanced authentication ser vices through the Extensible Authentication Protocol (EAP), which offers a way to plug in different authentication services without having to invent additional PPP.

Answers to these questions and explanations of why each answer choice is correct or incorrect are located in the Answers section at the end of the book.

1. 2.

You want to identify which event in the webpage life cycle takes the longest time to execute. How can you accomplish this

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authentication protocols. Because L2TP is encrypted inside of an IPSec transport mode packet, these authentication services are strongly protected as well. Most importantly, via integration with Lightweight Directory Access Protocol (LDAP) based directories and Remote Authentication Dial-In User Service (RADIUS), L2TP gives the industry a common interoperable way to authenticate users while supporting the authentication services that most customers and vendors already have in place. While there are vendors working on and proposing other authentication services for IPSec only, these alternatives are not on an IETF-standards track. Rather than supporting existing IETF standards for extensible authentication, these proposals introduce yet another authentication framework with serious known security vul nerabilities. Microsoft believes that customer needs are best served by keeping security implementations standards-based.

A. Turn on ASP.NET tracing and run the website. After that, review the trace results. B. To each of the life-cycle events, add a line of code that will print the current time. c. In the Web.config file, add the monitorTimings attribute and set it to true. D. In the website properties, turn on the performance monitor and run the website.

Figure A-6 : The Authentication Methods dialog box There are a few options available here, but basically, this dialog box allows you to do two things: you can either allow anonymous access to the virtual directory or require users to be Windows users All Windows operations are in fact controlled by security, and all actions must take place in the context of some user So when we specify that anonymous users are allowed by selecting the Anonymous Access checkbox, what user account is used Clicking Edit in the Anonymous Access section of the Authentication Methods dialog box will display the Anonymous User Account dialog box that will allow you to select the account under whose context anonymous users will work By default, this account is named IUSR_<machine name> This account needs to have permissions for the folders containing documents that anonymous users will have access to If your ASP.

After that, open the performance monitor to see the timings. You want to run a trace continuously to enable you to quickly look at the 10 most recent traces from anyone using your website, but you are concerned about filling your hard drive with excessive data. Which of the following settings will accomplish your objective

Currently many IPSec TM implementations use proprietary methods for address assignment and configuration, rather than supporting IETF standards such as Dynamic Host Configuration Protocol (DHCP). Microsoft, along with Sun Microsys tems, Intel, and RedCreek, has proposed using DHCP to address and configure IPSec tunnels, allowing integration with enterprise-class IP address management solutions. IPSec TM clients that support proprietary address assignment methods are incapable of supporting the wide range of configuration options already supported by DHCP. In addition, these clients cannot use advances in DHCP technol ogy, such as DHCP Failover, address pool management, or DHCP authentication. They therefore represent a dead-end for IP address management. Because L2TP uses PPP, it can easily be integrated with existing IP address manage ment systems. PPP clients can use Internet Protocol Control Protocol (IPCP) for address assignment and the DHCPInform message for configuration, while PPP and L2TP servers can integrate with IP address management and configuration systems via DHCP and RADIUS. As a result, L2TP provides good interoperability based on existing standards.

enabled="false" requestLimit="10" pageOutput="false" traceMode="SortByTime" localOnly="true" mostRecent="true" />

enabled="true" requestLimit="10" pageOutput="true" traceMode="SortByTime" localOnly="true" mostRecent="true" />

enabled="true" requestLimit="10" pageOutput="false" traceMode="SortByTime" localOnly="true" mostRecent="false" />

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