winforms qr code D. Incorrect: To modify the Secure Server (Require Security) policy so that it per in Visual Basic .NET

Create Data Matrix in Visual Basic .NET D. Incorrect: To modify the Secure Server (Require Security) policy so that it per

D. Incorrect: To modify the Secure Server (Require Security) policy so that it per
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mits the transmission of a certain application s traffic without IPSec security, you must use a filter action configured with the Permit option, which disables all IPSec negotiation between the computers for the traffic specified by the associated filter list. However, because the Windows Server 2003 implementation of IPSec includes a Permit filter action by default, there is no need to create a new one.
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Planning and Maintaining Network Security (5.0)
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Correct Answers: A and B
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A. Correct: To protect data passing over a WAN connection when there are clients
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on the connected networks that do not support IPSec (such as Windows 98), you specify the use of tunnel mode when creating a rule for the IPSec policy. When you use tunnel mode, you must also specify the IP address of the tunnel endpoint, that is, the router connecting the local network to the WAN.
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B. Correct: To configure IPSec to secure only the traffic generated by a particular
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application, you must create a filter list isolating that traffic.
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C. Incorrect: Filter lists identify the types of traffic that IPSec will secure, but in the
case of a tunnel mode policy, you specify the IP addresses of the routers when you configure the endpoints of the tunnel.
D. Incorrect: The Permit option allows the computer to transmit packets conform
ing to the filter list without any security negotiation or IPSec protection. You do not need a filter action using this option when you want to secure the traffic gen erated by an application.
Correct Answers: B and D
A. Incorrect: IPSec does not use the IP Authentication Header protocol with either
of the two default filter action settings (Integrity Only and Integrity And Encryp tion). To configure IPSec to use AH, you must create custom filter action settings.
B. Correct: IPSec uses the IP Encapsulating Security Payload protocol for both
default filter action settings (Integrity Only and Integrity And Encryption).
C. Incorrect: The ESP protocol uses the Triple-Data Encryption Standard (3DES)
algorithm to encrypt data only. This algorithm is not needed when you select the Integrity Only option, because no encryption occurs.
D. Correct: ESP uses Secure Hash Algorithm 1 (SHA1) to provide data integrity and
authentication when you select either the Integrity Only option or the Integrity And Encryption option.
Objective 5.3
Plan for Network Protocol Security
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Objective 5.3
Plan for Network Protocol Security
The data encapsulation method used by the protocols operating at the various layers of the Open Systems Interconnection (OSI) reference model requires that each layer be informed of the protocol operating at the next layer. For example, the network layer protocol header of a packet must specify what transport layer protocol generated the information inside the packet, and the transport layer protocol header must specify an application transport layer protocol. This method ensures that a receiving computer running more than one protocol at a particular layer knows where to send each packet as it travels up through the protocol stack. The Internet Protocol (IP) has a Protocol field in its header that identifies the proto col that generated the information in the datagram. In most cases, the Protocol field specifies a transport layer protocol, such as the Transmission Control Protocol (TCP) or the User Datagram Protocol (UDP), but it can also specify another network layer protocol, the Internet Control Message Protocol (ICMP). In the same way, the TCP and UDP protocols have header fields called Source Port and Destination Port, which specify the application or service that generated and will receive the message in the packet. The transport layer protocols contain separate source and destination port numbers because the client and server parts of a particular application frequently use different port numbers. The values that IP, TCP, and UDP use in the Protocol, Source Port, and Destination Port fields use numerical codes that are standardized by the Internet Assigned Numbers Authority (IANA) and published online in the IANA Port Numbers online database (this database replaces RFC 1700 Assigned Numbers. The protocol values are rela tively few, and on TCP/IP systems, the value of the Protocol field in an IP packet is nearly always 6 (for TCP), 17 (for UDP), or 1 (for ICMP). Port numbers are much more numerous, because there are many applications registered with the IANA. There are two types of port numbers: well-known port numbers and ephemeral port numbers. A well-known port number is a permanently assigned number representing a spe cific application or service. Most well-known port numbers represent the server side of a client/server application. Every TCP/IP system has a file called Services, which con tains a list of the most commonly used well-known port numbers. Some of these wellknown port numbers are shown in the following table:
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