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a TCP/IP network (see Understanding TCP/IP in Depth, page 24, to learn more). These services and protocols are all you need to participate on a standard network providing TCP/IP and Microsoft networking services. However, in network environments where other protocols and services are used (such as NetWare), you can install additional services and protocols from the General tab. See 18, Interconnectivity with Other Systems, to learn more about Windows XP interoperability with other network operating systems.

X.25

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X.25 is a standard that defines the connection between a terminal and a packet-switching data network. When X.25 originated in the early 1970s, the noisy, copper-based telephone infrastructure dictated devoting a great deal of overhead to ensure packet reliability. Media reliability improvements since then, including optical fiber lines, has made the costly focus on datalink reliability unnecessary. ISDN and Frame Relay have largely replaced X.25 as preferred remote connectivity solutions. X.25, however, remains a widely accepted worldwide data communications standard. Consequently, X.25 continues to be used, often in tandem with newer technologies. X.25 is supported in Windows XP Professional.

Point-to-Point Protocol (PPP) is a set of framing and authentication protocols included with Windows remote access to ensure interoperability with third-party remote access software. PPP over Ethernet (PPPoE) provides the ability to connect a network of hosts over a simple bridging access device to a remote access concentrator. With this model, each host uses its own PPP connection and the user is presented with a familiar user interface. Access control, billing, and type of service can be accomplished on a per-user, rather than a per-site, basis. To provide a point-to-point connection over Ethernet, each PPP session must learn the Ethernet address of the remote peer, as well as establish a unique session identifier. PPPoE includes a discovery protocol that allows this to take place.

3

Microsoft Ethernet PVC provides support for Ethernet and IP data encapsulation over ATM. This enables the encapsulation and transport of IP or Ethernet packets over ATM between a client connected by means of an ATM permanent virtual connection to a supporting infrastructure. To accomplish this, Microsoft Ethernet PVC acts as a bridging Ethernet adapter for the TCP/IP protocol or a routing adapter for the TCP/IP protocol alone and uses the PVC on the ATM or internal ADSL adapter to transfer encapsulated data. Windows XP Professional supports the two encapsulation methods defined in RFC 2684: LLC Encapsulation and VC Multiplexing. Both Ethernet and IP protocols are supported using either encapsulation method on both bridged and routed PDUs (protocol data units). For example, protocols supported by Microsoft Ethernet PVC in Windows XP Professional include PPPoE (PPP over Ethernet), L2TP (Layer Two Tunneling Protocol), Ethernet, or Ethernet encapsulated in IP.

Part IV:

If you access the Local Area Connection Properties dialog box in Network Connections, you ll find an Authentication tab. The Authentication tab, shown in Figure 3-9, enables you to configure authenticated network access for both wired and wireless Ethernet networks if network authentication is required on your network. The authentication option you see in the figure uses the IEEE 802.1x standard that provides network authentication of devices based on their port or connection to the network, which is why you find the 802.1x option in the connection s Properties dialog box. Using 802.1x, you can require authentication using Extensible Authentication Protocol (EAP). EAP is a highly secure authentication standard for both wired and wireless Ethernet networks. Different EAP types are available for authentication including Message Digest 5 (MD5) Challenge or a smart card or digital certificate. If you are using a smart card or digital certificate, click the Properties button to configure the option you want to use. To implement the 802.1x standard, each network client should use the authentication settings on this tab to ensure security. You can choose to have the computer attempt to authenticate itself to the network using computer information when a user is not currently logged on. You can also choose to have the computer attempt to connect to the network as a guest when neither computer information nor a signed on user are present.