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Before taking the exam, review the key points and terms that are presented in this chapter. You need to know this information.
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Configuring ISA Server as a Firewall
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ISA Server does not support the direct configuration of a packet filter. To block all connection attempts from a specific host, or to allow a specific protocol from a particular host you must configure an access rule. Both access rules and network rules are processed by ISA Server before network traffic is passed through the firewall. Check the configuration of both types of rules when troubleshooting network access. ISA Server network templates simplify the configuration of the ISA Server settings. However, the templates also enable only outbound access and have a limited set of configuration options. You should have a clear idea what each template does so that you can troubleshoot any problems with the template. Blocking IP fragments is an example of a configuration option that may provide some additional security but at the cost of some functionality. If users cannot use a streaming media application one of the possible explanations is that IP fragments are being blocked. By default, IP fragment blocking is not enabled on ISA Server. HTTP Web filter rules are applied on a per rule basis. Just because you have configured filtering on one rule, does not mean that filtering is applied to all rules. If you have multiple rules that grant access to the Internet, you need to configure the filter for all the rules.
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intrusion detection A means to detect when an attack is attempted or in progress against a network. If you detect an intrusion attempt early enough, you may be able to prevent a successful intrusion. network rule Defines how network packets will be passed between networks. Network rules determine whether there is a relationship between two network entities and what type of relationship is defined. network template A set of ISA Server configuration options that define networks and network sets, network rules, access rule elements, and access rules. packet filtering Filters network packets by inspecting and allowing or denying the IP packets based on information in the IP packet network layer header. perimeter network A network that is separated from an internal network and the Internet. Perimeter networks allow external users to gain access to specific servers that are located on the perimeter network while preventing direct access to the internal network.
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stateful filtering Filters network packets by using information about the TCP session to determine if a packet should be blocked or allowed through the firewall. Web filters Extend the functionality of the firewall service in ISA Server by providing advanced filtering capability for HTTP packets as they pass through ISA Server.
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7
Configuring ISA Server as a Firewall
Questions and Answers
Page 7-10
Lesson 1 Review
1. You are the ISA Server administrator of your organization. You have deployed ISA Server 2004 as the firewall and configured it so that the users have unrestricted access to the Internet. You suspect that some of your users have installed a peerto-peer file sharing application which is not an approved application. The application uses a custom protocol and port number to communicate with other computers. You need to ensure that traffic from that application is not allowed into your network from the Internet. What is the easiest way for you to accomplish this a. Create a packet filter to block the port used by the application. b. Do nothing. The traffic is blocked by default. c. Configure an application filter to block the traffic. d. Create an access rule to block the port used by the application.
D is correct. You can block the application by creating an access rule to block the port used by the application. A is incorrect because you cannot specifically create packet filters in ISA Server 2004. B is incorrect because, if the application is already installed, the request is coming from an internal user and stateful filtering will allow the connection. C may be possible if you have an application filter that blocks the protocol used by the application, but just blocking the port is easier in this scenario.
2. How does application filtering protect the internal network a. By blocking IP fragments b. By inspecting the data in a packet for unacceptable commands and data c. By blocking connections to particular ports d. By allowing or disallowing traffic based on connection rules
B is correct. The advantage of using an application filter is that it can inspect the data in an IP packet. A and C are incorrect because application filters do not block IP fragments or ports. D is incorrect because connection rules track session status.
3. What feature of ISA Server prevents IP addresses that logically appear on the Internal network from entering your network through the external interface a. Egress filtering
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