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Constraints configured in the remote access policy profile, such as allowed dial-up hours, are preventing the connection from being established.

The reorganized code shows that two things are happening. In the first example, the lack of statement organization and blank lines, and the old aligned-equalssigns trick, make the statements look more related than they are. The second way in which using blank lines tends to improve code is that it opens up natural spaces for comments. In the code above, a comment above each block would nicely supplement the improved layout.

Questions and Answers 10-87

To deploy a PPTP-based remote access solution, perform the following steps:

Format single-statement blocks consistently A single-statement block is a single statement following a control structure, such as one statement following an if test. In such a case, begin and end aren t needed for correct compilation and you have the three style options shown in Listing 3131.

In the policy profile for the applicable remote access policies, clear all encryption strength options except for Strongest Encryption (MPPE 128-Bit).

Page 10-67

if ( expression ) one-statement;

1. What is the difference between the certificates used for the EAP-TLS authentication protocol and those used for the L2TP/IPSec VPN protocol

issue user certificates to VPN client computers and computer certificates to your authenticating server computers.

EAP-TLS relies on user certificates for user authentication. Certificate-based L2TP/IPSec relies on computer (machine) certificates for computer authentication.

if ( expression ) { one-statement; } if ( expression ) { one-statement; } if ( expression ) one-statement;

2. You have configured a VPN server, but users report that they sometimes cannot connect. You have noticed that the greatest number of complaints occur when network use is highest, and you have ruled out addressing as the cause. What is the most likely reason for the intermittent access problems

You have not configured enough VPN ports to support the number of VPN users who want to connect at once during periods of high use.

There are arguments in favor of each of these approaches. Style 1 follows the indentation scheme used with blocks, so it s consistent with other approaches. Style 2 (either 2a or 2b) is also consistent, and the begin-end pair reduces the chance that you ll add statements after the if test and forget to add begin and end. This would be a particularly subtle error because the indentation would tell you that everything is OK, but the indentation wouldn t be interpreted the same way by the compiler. Style 3 s main advantage over Style 2 is that it s easier to type. Its advantage over Style 1 is that if it s copied to another place in the program, it s more likely to be copied correctly. Its disadvantage is that in a line-oriented debugger, the debugger treats the line as one line and the debugger doesn t show you whether it executes the statement after the if test. I ve used Style 1 and have been the victim of incorrect modification many times. I don t like the exception to the indentation strategy caused by Style 3, so I avoid it altogether. On a group project, I favor either variation of Style 2 for its consistency and safe modifiability. Regardless of the style you choose, use it consistently and use the same style for if tests and all loops.

Connect your VPN server on the Internet. Deploy your AAA infrastructure (including RADIUS servers).

Page 10-81

For complicated expressions, put separate conditions on separate lines Put each part of a complicated expression on its own line. Listing 31-32 shows an expression that s formatted without any attention to readability:

The first type is a network access server running Routing And Remote Access. The second type is a RADIUS proxy running IAS.

2. For a computer running IAS, what is the difference between remote access poli cies and connection request policies

6

if ((('0' <= inChar) && (inChar <= '9')) || (('a' <= inChar) && (inChar <= 'z')) || (('A' <= inChar) && (inChar <= 'Z'))) ...