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Q: I ve written a script/class and don t want other scripts messing with my functions or variables, as I might change them at a later date. Can I do this A: Stick with the default access mode. It gives you complete freedom with your variables and functions because no other script can interact with them. Q: I m writing a package. Some functions and variables need to be accessible across scripts and classes of the package, but I don t want other programmers getting access to them. Is this possible A: Sure, the package access modifier will do that for you. Q: Some of my class s functions and variables would be useful to authors of subclasses, but I don t want to open them up to the world. How is this done A: Check out the protected access modifier; it grants package visibility, plus any subclasses from outside the package. Q: I have a class with some variables I d like to make readable by everyone, but I still want to control write access to them. Can JavaFX Script do this A: Indeed! Just combine public-read with one of the four basic modes. Q: I d like to control writing to my instance variables, except when the instance is first created. Is this possible A: Funny you should ask. Just add public-init to one of the four basic modes, and your variables will become public writable when used from an object literal. Q: So, why can t I use these additive modifiers with def variables A: Common sense. A public-read def would be the same as a public def, and a public-init def would be rather pointless.

1. On CLIENT1, try to access the Internet using MSN Messenger or Windows Messenger. 2. Confirm that you cannot access the Internet using these applications.

Summary

functionality. Four types of connection security rule can be created, along with the ability to create custom rules. The four types of connection security rules are:

7-67

Isolation Rule This rule isolates Windows Vista computers based on authentication credentials such as a common domain. It is used to isolate groups of computers from others on the network. Authentication Exemption Rule This rule prevents a Windows Vista computer from authenticating connections from computers specified in the rule. This is usually used in conjunction with an isolation rule to allow exceptions to that rule. For example, you want to restrict a computer from communicating with any computers except those in the same domain, but you also want it to communicate with two Mac OSX client computers. Server-To-Server Rule This rule is used to protect connections between servers. An example might be between a web server application and a database hosting credit card information. Tunnel Rule This rule is used to create encrypted tunnels across the Internet. Organizations often use this encryption technique to establish links between branch offices rather than to install dedicated data lines.

Enough questions, let s consider some actual source code (listing 3.16).

Summary

Firewalls are used to limit network traffic from one network to another Firewalls use packet filters, stateful filters, application filters, and intrusion detection to distinguish between network traffic that should be allowed and network traffic that should be blocked ISA Server 2004 supports multi-networking, which means that you can configure multiple networks on ISA Server, and then configure network and access rules that inspect and filter all network traffic between all networks ISA Server comes preconfigured with the following networks: Local Host, External, Internal, VPN Clients, and Quarantined VPN Clients Network rules determine whether there is a relationship between two network entities and whether the relationship is a route and network address translation (NAT) relationship A perimeter network is a network that you set up separately from an internal network and the Internet There are three general types of network perimeter configurations; bastion host, three-legged configuration, and back-to-back configuration.

Although you will encounter only questions that relate to configuring Windows Firewall or Firewall with Advanced Security on the 70-620 exam, it is also possible to configure Windows Firewall from the command line using the netsh command in the advfirewall context. For more information, run a command prompt as an administrator and enter the command netsh advfirewall / .

The network templates included with ISA Server 2004 include preconfigured networks and network sets, network rules, access rule elements, and access rules The templates are designed to simplify the process of configuring ISA Server The purpose of intrusion detection is to detect network attacks as early as possible to ensure that appropriate corrective actions can be taken ISA Server provides intrusion detection for well-known IP attacks and also provides built-in application filters that detect DNS protocol and Post Office Protocol (POP) intrusions IP preferences are used to configure how ISA Server will handle specific IP packets You can configure the following IP preferences on ISA Server: IP Option, IP fragments, and IP Routing Application filters work with the firewall service in ISA Server to intercept and process network packets as they pass through ISA Server.