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This test is poorly organized in several ways, one of which is that the tests are redundant. When you test whether quantity is greater than 1000, you don t also need to test whether it s greater than 100 and greater than 10. Consequently, you can reorganize the code:

3

This appendix provides detailed information about how you can use five comput ers to create a test lab with which to configure and test virtual private network (VPN) remote access with Microsoft Windows XP and the Windows Server 2003 family. These instructions are designed to take you step by step through the config uration required for Point-to-Point Tunneling Protocol (PPTP) and Layer Two Tun neling Protocol with Internet Protocol Security (L2TP/IPSec) connections, and finally they will take you through setting up a VPN connection that uses certificatebased Extensible Authentication Protocol-Transport Level Security (EAP-TLS) authentication. Note The following instructions are for configuring a test lab using a minimum number of computers. Individual computers are needed to separate the ser vices provided on the network and to clearly show the desired functionality. This configuration is not designed to reflect best practices, nor is it designed to reflect an optimal or recommended configuration for a production network. The configuration, including IP addresses and all other configuration parameters, is designed to work only on a separate test lab network.

4. You are experiencing a delay when you connect to a remote Web site. Which tool allows you to determine whether particular routers are responsible for the delay a. Netdiag b. Network Diagnostics c. Tracert d. PathPing

if ( 1000 < quantity ) { discount = 0.10; } else if ( 100 < quantity ) { discount = 0.05; } else if ( 10 < quantity ) { discount = 0.025; } else { discount = 0; }

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Tracert is best used to begin troubleshooting this problem because in this case, two routers separate the subnets. This utility enables you to determine at which subnet or router the prob lem occurs.

The infrastructure for the VPN test lab network consists of five computers perform ing the following services:

This solution is easier than some because the numbers increase neatly. Here s how you could rework the nested if if the numbers weren t so tidy:

3. A user on Subnet C can connect to resources on the company extranet in both branch offices, but connectivity to the Cortland branch is slow. Images often do not appear on extranet pages hosted at the Cortland branch.

PathPing is best used in this case because connectivity is erratic and slow. This tool enables you to determine whether erratic packet loss is occurring at the Cortland branch firewall or at another router.

if ( 1000 < quantity ) { discount = 0.10; } else if ( ( 100 < quantity ) && ( quantity <= 1000 ) ) { discount = 0.05; } else if ( ( 10 < quantity ) && ( quantity <= 100 ) ) { discount = 0.025; } else if ( quantity <= 10 ) { discount = 0; }

4. A user on Subnet C reports that sometimes when she tries to specify a network resource by name, a connection cannot be established. The user knows her IP address, and you have configured all client computers on her subnet to run the Telnet service.

that is acting as a domain controller; a Domain Name System (DNS) server; a Dynamic Host Configuration Protocol (DHCP) server; and a certification authority (CA).

The main difference between this code and the previous code is that the expressions in the else-if clauses don t rely on previous tests. This code doesn t need the else clauses to work, and the tests actually could be performed in any order. The code could consist of four ifs and no elses. The only reason the else version is preferable is that it avoids repeating tests unnecessarily.

In this case, you can use Telnet to access the IP address in question and run Netdiag from across the network. This strategy provides you a full range of IP configuration information, including the client s configured name servers.

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Convert a nested if to a case statement You can recode some kinds of tests, particularly those with integers, to use a case statement rather than chains of ifs and elses. You can t use this technique in some languages, but it s a powerful technique for those in which you can. Here s how to recode the example in Visual Basic: