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DH exchange (of public values) At no time are actual keys exchanged; only the base information needed by DH to generate the shared, secret key is exchanged. After this exchange, the IKE service on each computer generates the master key used to protect the final step: authentication. Authentication The computers attempt to authenticate the DH exchange. Without successful authentication, communication cannot proceed. The master key is used, in conjunction with the negotiation algorithms and methods, to authenticate identities. The entire identity payload including the identity type, port, and protocol is hashed and encrypted by using the keys generated from the DH exchange in the second step. The identity payload, regardless of which authentication method is used, is protected from both modification and interpretation.

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After the hosts have mutually authenticated each other, the host that initiated the negotiation presents an offer for a potential SA to the receiving host. The responder cannot modify the offer. Should the offer be modified, the initiator rejects the responder s message. The responder sends either a reply accepting the offer or a reply with alternatives. After the hosts agree on an SA, quick mode negotiation begins.

Part III:

Microsoft application or a third-party application for each category, and if a third-party application is chosen, whether to also enable or hide the Microsoft-equivalent application for the category. The settings for each main option can be accessed by clicking the arrow on the right side of the dialog box next to the button for each entry. Selecting an option also expands that option s settings. With the introduction of Windows XP SP1, many new Windows computers might be delivered from their manufacturers with some or all of the Microsoft applications replaced or even hidden in favor of third-party tools.

In this mode, SAs are negotiated on behalf of the IPSec service. The following are the steps in quick mode negotiation:

data transfer:

The hash algorithm for integrity and authentication (MD5 or SHA1) The algorithm for encryption, if requested (3DES or DES) A description of the traffic to protect

1000Base-T Also referred to as Gigabit Ethernet, an Ethernet standard capable of 1 gigabit per second (Gbps), or 1,000 Mbps, over twisted-pair wiring. 100Base-T Also called Fast Ethernet, an Ethernet standard that has a capacity of 100 Mbps over twisted-pair wiring. 10Base-T An Ethernet standard with a capacity of 10 Mbps over twisted-pair wiring.

Session key material refresh or exchange IKE refreshes the keying material, and new, shared, or secret keys are generated for authentication and encryption (if negotiated) of the packets. If a rekey is required, a second DH exchange takes place or a refresh of the original DH exchange occurs. SA exchange

A common agreement is reached, and two SAs are established: one for inbound communication, and one for outbound communication. During the quick mode negotiation of shared policy and keying material, the information is protected by the SA negotiated during main mode. As mentioned in step 3, quick mode results in a pair of SAs: one for inbound communication and one for outbound communication, each having its own SPI and key. Figure 19-7 shows a summary of what is negotiated during main mode and quick mode.

access control list (ACL) A list associated with a file or other resource that contains information about which users or groups have permission to access the resource. access method The way in which a computer accesses a network at the physical layer of the OSI reference model. CSMA/CD is considered an access method used in Ethernet networks. See also Carrier Sense Multiple Access with Collision Detection. Active Directory The directory service used by modern Windows domains. Active Directory holds all user and group accounts as well as information about network resources, policies, and other objects. Active Server Pages (ASP) A server-side scripting language used by Web content developers that provides much of the interactive content on the Internet. ASP applications can be used to create dynamic Web content. ASP is supported by Internet Information Server (IIS) in Windows XP Professional. See also Internet Information Server. Address Resolution Protocol (ARP) A protocol used by computers to resolve IP addresses to physical (or MAC) network addresses, so that traffic can be forwarded appropriately on a network. A transmitting computer begins the process of transmitting IP address data by sending an ARP broadcast to all network devices on the local subnet, asking which maintains the specified IP address. If a computer replies, communications