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Authentication devices need to be purchased for every user to whom they are assigned. Biometric readers need to be purchased for every workstation from which a biometric-authenticated user is going to log in. An exception is Apple s Macintosh OS 9, which incorporates voice recognition for authentication, using the built-in microphone provided with most Macintosh computers. Keystroke biometrics are a second exception, as they are designed to work in conjunction with existing keyboards. Some authentication systems allow different users to be assigned different authentication mechanisms: one might use a password while another might use a password token, and another might use a biometric reader. This changes the cost picture and allows the site to customize authentication according to user needs and specific risks. Device-based and biometric-based systems will often require an authentication server, which should be hosted on a dedicated computer; a back-up server should usually be included to provide authentication services if the primary server goes down.

Because the parameter to CompareTo( ) must be of type object, obj must be explicitly cast to MyClass in order for Val to be accessed. However, it s precisely this type of thing that generics were designed to eliminate! To solve this problem, C# provides a generic version of IComparable, which is declared like this: public interface IComparable<T> In this version, the type of data being compared is passed as a type argument to T. This causes the declaration of CompareTo( ) to be changed, as shown next: int CompareTo(T obj) Now, the parameter to CompareTo( ) can be specified as the proper type and no cast from object is needed. IComparable<T> is also implemented by all built-in types. Here is an improved version of MyClass that implements IComparable<T>:

// Catching derived classes. #include <iostream> using namespace std; class B { }; class D: public B { }; int main() { D derived; try { throw derived; } catch(B b) { cout << "Caught a base class.\n"; } catch(D d) { cout << "This won't execute.\n"; } return 0; }

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Off-the-shelf sources mentioned in 12 are really the only way to include a controller into your electric vehicle. While a switch-based handmade controller is OK, safety is the key. Whereas, there are no interlocks or revlimiting features on a switch-based handmade controller. For those who do not know, revlimiting a technology inside the controller that regulates the highest speed the vehicle will be allowed to go. This basically acts as a rev limiter. Also, resistors waste energy. A controller from a reputable company that can provide safety and reliability is the number one priority. The controller correctly matched to the motor will give it the right voltage. The weight of the motor magnets and size of its brushes determine the power and torque. You can buy a reliable controller from a number of sources today at a good price.

1. 3 dBmV for the audio carrier level 28 dBmV (b) 12 dBmV 3. (a)

Any router may be used that supports the appropriate LAN interface and has at least two WAN interfaces that suit the customer s network.

Not every IOS version has the same upgrade process, so what you see on your router may be different from what appears in this book, especially if you are running IOS version 11.x or earlier.

Watt-hours supplied by inverter. Peak watts supplied by inverter with generator off. Peak watts supplied by generator.

You should include comments whenever they are needed to explain the operation of the code. All but the most obvious functions should have a comment at the top that states what the function does, how it is called, and what it returns. C++ fully supports C-style comments. However, it also allows you to define a single-line comment. Single line comments begin with a // and end at the end of the line. Also, the new C99 standard for C allows //-style comments.

Keep the connection active during the whole session This means user queries are never slowed down for the source system/data warehouse login and logout process. This is great for users but can become expensive for RDBMS licensing and Enterprise server overhead.

Of the three ACLs, the one for the external users is the simplest. The first and second statements allow internal users access to the e-mail and web servers on 192.168.5.0/24 notice that the destination addresses are the public addresses, because this is what the appliance sees. The third statement drops all traffic, and the last statement activates the ACL on the outside interface. As you can see from this example, the configuration of ACLs can be a very complex process. You should always test any changes you make to your ACLs to ensure that you are not inadvertently opening any unnecessary holes in your appliance. TIP I highly recommend you read a chapter in my Cisco Press book, Cisco Router Firewall Security (Cisco Press, 2004), on basic ACLs you should be filtering many, many addresses, connections, applications, and protocols from untrusted sources. For example, the ACL in Listing 6-6 will have dozens or hundreds of statements before the specific permit statements for the DMZ servers, dropping all kinds of undesirable traffic that you don t want your servers to see.