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When wireless networks first came out many years ago, they lacked any form of authentication After many fits and starts, the wireless community grabbed a preexisting authentication standard called 8021X to use in their wireless networks 8021X is a port-authentication network access control mechanism for networks In other words, it s a complete authentication standard designed to force devices to go through a full AAA process to get anywhere past the interface on a gateway system Before 8021X, a system on a wired network could always access another system s port Granted, an attacker wouldn t be able to do much until he gave a user name/password or certificate, but he could still send packets to any computer on the network This wasn t good, because it enabled attackers to get to the systems to try to do evil things 8021X prevented them from even getting in the door until they were authenticated and authorized

Naming services are critical to achieving a reliable and usable network environment Designing and implementing DNS, WINS, and DHCP services on any network requires careful planning The first step in this process, when building a new network or enhancing an existing one, is to start with a detailed review and documentation of the existing network Look for the following facts and statistics: Network node count Remote location topology Location of TCP/IP-based servers Existing WAN capacity and reliability Topology of network backbones Internet connections (addressing, firewalls, points of entry, capacity, etc) Firewalls used to secure the network (NAT, PAT, etc) Geographical organization considerations Organizational structure considerations (business units, multinational, etc) Private external connections to other organizations (capacity, topology, configuration) Remote access points of entry Existing NT domain architecture Existing WINS architecture Staffing to provide ongoing network support TCP/IP addressing schemes in use and required DNS servers outside the organization (usually at the ISP) Network diagrams Workstation/printer/device configurations (assess ability to support naming services) When you have all this information before designing a naming services solution, you'll be able to tackle many of the design issues quickly and efficiently

The interesting part is that you already know about most of the parts of 8021X, because the standard worked hard to use existing technologies From a distance, 8021X looks a lot like a RADIUS AAA setup 8021X changes the names of some of the components, as shown in Figure 11-30 Compare this to Figure 11-23 to get the new names (the jobs don t change)

(114)

Figure 11-30

Windows 2000 was designed from the ground up to be fully integrated with Windows 2000Active Directory service The new AD service uses the Windows 2000 multimaster replication engine Replication of DNS records from one DNS server to another (zone transfers) happens differently, and the concept of primary and secondary DNS servers changes In a traditional DNS configuration, replication is based on a single master updating secondary DNS servers In Active

SOLUTION This is a simple substitution problem We start with Eq (111) and choose t = x2 It follows that dt = 2 xdx

8021X combines the RADIUS-style AAA with EAP versions to make a complete authentication solution The folks who developed 8021X saw it as a total replacement for every other form of authentication (even Kerberos), but the reality is that most people don t like changing something that already works To that end, only wireless networking broadly adopted 8021X NOTE Technically, wireless networks don t use EAP They use 8021X, which in turn uses EAP

Directory replication, the DNS environment can be multimaster Each DNS server in the network contains a complete copy of the DNS records A change made on one DNS server will be quickly replicated to all other servers in the environment, thereby increasing the overall fault tolerance of the environment and the availability of current DNS record information

We re not done with authentication and authorization, but at least you now understand the basics of the popular authentication and authorization protocols and standards There are more protocols to learn, but all of them are rather specialized for specific uses and thus are covered at various places throughout the book

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