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Given the concerns of Tailspin Toys as outlined above, answer the following questions: 1 What type of setting within Group Policy will assist you in addressing the com pany s concerns regarding the execution of e-mail attachments.

Wireless access points You need to create a different beacon frame with new 802.11 WPA information containing the SP security configuration, a specification of encryption algorithm, and wireless security configuration. A firmware update might be available for existing wireless APs. Wireless network adapters The firmware must be updated to support the WPA information element, WPA two-phase authentication, TKIP, and optionally Michael. A firmware update might be available from the wireless card manufac turer. To be compatible with Windows XP (service pack 1) and Windows Server 2003, the network adapter must pass the adapter WPA capabilities and security configuration on the Wireless Zero Configuration Service. Wireless client programs Wireless client programs must be updated so that they can configure WPA authentication and WPA encryption algorithms. Windows XP Home and Professional (service pack 1 and later) or Windows Server 2003 will need the Windows WPA update client. The client will also modify the wireless configuration GUI to support new WPA options.

The KCC analyzes the replication topology within a site every 15 minutes to ensure that it still works. If you add or remove a domain controller from the network or a site, the KCC reconfigures the topology to reflect the change.

Some services require some initialization or cleanup to be used properly. For example, a file transfer module may want to open a connection to a remote server before processing requests to transfer files and should safely release all resources before being brought out of service. For component types that have a lifecycle, EJB allows for callback notifications, which act as a hook for the bean provider to receive these events. In the case of our file transfer bean, this may look like:

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Follow these guidelines to secure wireless 802.11 networks:

1

Use WPA if it is supported by your wireless hardware. Use 802.1x if it is supported by your wireless hardware. If neither WPA or 802.1x is available, use open system authentication and config ure WEP. If 802.1x, WPA, or both are not an option, use a VPN. Design the location of APs to eliminate or at least reduce the amount of wireless access to your networks that can be found from outside your network.

When more than seven domain controllers are added to a site, the KCC creates addi tional connection objects across the ring structure so that if a change occurs at any one domain controller, replication partners are available to ensure that no domain control ler is more than three replication hops from another domain controller, as shown in Figure 1-11. These optimizing connections are created at random and are not necessar ily created on every domain controller.

prototype FileTransferService {

Figure 1-11 A maximum of three replication hops between domain controllers, due to the addition of connection objects by the KCC

In this practice, you will design security for an access point that has just been discov ered on a fictitious company s network. Read the scenario and answer the question that follows. If you are unable to answer the question, review the lesson materials and try the question again. You can find the answer to the question in the Questions and Answers section at the end of the chapter.

Intersite Replication To ensure replication between sites, you must connect them manually by creating site links. Site links represent network connections and allow rep lication to occur. A single KCC per site generates all connections between sites. Active Directory uses the network connection information to generate connection objects that provide efficient replication and fault tolerance, as shown in Figure 1-12. You provide information about the replication transport used, cost of a site link, times when the link is available for use, and how often the link should be used. Active Direc tory uses this information to determine which site link is used to replicate information. Customizing replication schedules so replication occurs during specific times, such as when network traffic is light, makes replication more efficient. As an administrator, you must configure sites and replication to ensure that the most up-to-date information is available to users. Replication and site link configuration are discussed in more detail in 5, Configuring Sites and Managing Replication.

@StartLifecycleCallback function openConnection(){ ... } @StopLifecycleCallback function closeConnection() { ... }

Designing Security for Wireless Networks 12-17

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