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You can think of IPSec policies as a collection of packet filters that enforce security policy on IP traffic. Each filter describes some network protocol action. If traffic leaving or arriving at the device (a computer or other IP network device) on which the policy is active matches one of the filters, the traffic is either blocked, allowed, or, before it can proceed, an IPSec connection is negotiated between the sending and receiving devices. Filters can be the receipt or initialization of a specific protocol, a connection request from or to a specific device, or another action that can be determined by protocol, port, IP address, or range. These filters are defined in the IPSec policy in a rule. Example fil ters might include the following:

All traffic from IP address 192.168.5.77 All traffic to IP address 192.168.5.101 All traffic on port 23, telnet s default port Traffic from 192.168.6.99 on port 23

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3. You ve protected the components that are being called by the main application. How can you ensure that the individual components can never be called by an application that hasn t been signed

The number of threads required increases with the degree of parallelism. If the thread requirement cannot be satisfied, the database engine

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Filters are combined into filter lists, which are, in turn, part of rules. Each rule also defines a filter action and potentially extensive configuration information that defines the specifics to be used for negotiating an IPSec connection. Filter actions are Block, Allow, or Negotiate Security. Each rule can have only one filter action, but a policy can be made up of many rules. For example, if the result required is that only telnet sessions that originate from a spe cific computer will be accepted and must be encrypted, two rules should be written: one to block all telnet traffic and the other to negotiate telnet traffic from that specific computer. When an IPSec policy is evaluated, the more specific rule will take prece dence. If the telnet traffic originates with the specified computer, the communication is negotiated, and, assuming the policy configuration matches where necessary, allowed to proceed. If the traffic originates from any other IP address, because no specific rule exists for the address, the more general rule is triggered and the communication will be blocked.

You can use CAS to require that callers have a strong name and are signed with your company s public key.

IPSec is natively available and can be used to protect network communications for Microsoft Windows 2000, Microsoft Windows XP Professional, and Windows Server 2003. A legacy client is available for Microsoft Windows NT 4, Microsoft Windows 98, and Microsoft Windows Millennium Edition (Me). You can download the legacy client from http://www.microsoft.com/windows2000/server/evaluation /news/bulletins/l2tpclient.asp. New features for IPSec include the following:

The IP Security Monitor snap-in improves on the Ipsecmon.exe tool in Win dows 2000. (New in Windows XP Professional and Windows Server 2003.) A stronger cryptographic master key is introduced, Diffie-Hellman 2048-bit. The Netsh command-line management tool provides convenience, plus many configuration possibilities that are not available from the IP Security Policy Management snap-in. Computer startup security (or stateful filter), if configured, is activated at startup and manages network traffic during startup. It allows only the outbound traffic that the computer initiates during startup, inbound traffic sent in response to the outbound traffic, and DHCP traffic. The persistent policy is applied if the local policy or the Active Directory directory service IPSec policy cannot be applied. Only Internet Key Exchange (IKE) traffic is exempt from traffic filters. This restriction is required in order to establish secured communication. Certain restrictions determine which computers are allowed to connect by domain, by certificate origin, or by computer group.

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Monitoring Network Protocol Security 11-27

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The name of the certificate authority (CA) can be excluded from certificate requests to prevent exposure of information on computer trust relationships such as domain, CA, and company. Logical addressing is applied for local IP configuration such as DHCP server, DNS, and WINS to accommodate dynamic addressing. IPSec functionality over NAT lets Encapsulation Security Payload (ESP) pack ets pass through Network Address Translations (NATs) that allow User Datagram Protocol (UDP) traffic. Integration with Network Load Balancing has improved, which is good for load balancing IPSec-based virtual private network (VPN) services. Support is provided for the Resultant Set Of Policy (RSoP) snap-in to view existing IPSec policy assignments.