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The simplest wireless network consists of two or more PCs communicating directly with each other without cabling or any other intermediary hardware (ad-hoc mode) More complicated wireless networks use a WAP to centralize wireless communication and bridge wireless network segments to wired network segments (infrastructure mode) Ad-hoc networks are also good for temporary networks such as study groups or business meetings Infrastructure mode is better suited to business networks or networks that need to share dedicated resources like Internet connections and centralized databases Out of the box, wireless networks have no security configured at all WAPs are usually configured to broadcast their presence to their maximum range and welcome all other wireless devices that respond Data packets are floating through the air instead of safely wrapped up inside network cabling Most WAPs support MAC address filtering, a method that enables you to limit access to your wireless network based on the physical, hardwired address of the unit s wireless network adapter Enabling WEP encrypts your data to secure it while in transit over the airwaves, but the WEP encryption standard itself is flawed and cannot be relied upon to protect your data against a knowledgeable and motivated attacker WPA and WPA2 address the weaknesses of WEP and act as a sort of security protocol upgrade to WEP-enabled devices WPA and WPA2 offer security enhancements such as an encryption key integrity checking feature and user authentication through the industry-standard EAP Depending on the standard used, wireless throughput speeds range from 2 Mbps to 54 Mbps Wireless devices dynamically negotiate the top speed that they can communicate at without dropping too many data packets

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Class MainWindow Private Sub Button1_Click( ByVal sender As SystemObject, ByVal e As SystemWindowsRoutedEventArgs) Handles Button1Click End Sub End Class

Mike Meyers CompTIA A+ Guide: PC Technician (Exams 220-602, 220-603, & 220-604)

IP Network Browser Allows you to perform a detailed discovery on one device or to scan a range of subnets Network Sonar Uses a Simple Network Management Protocol (SNMP) discovery engine to create a detailed discovery database of a high-speed data network Subnet List Discovers all subnets and masks on a network SNMP Sweep Queries a defined IP address range and then locates both used and unused IP addresses DNS Audit Inventories an IP address and validates the correct forward and reverse resolution of domain names

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The Click event handler, just created, is the highlighted method, button1_Click (Button1_Click in VB), that you see in Listing 8-1 We covered delegates and events in 4, which you can review for a better understanding of how this method handles the Click event Notice how the VB code shows another way to handle events in VB, by explicitly specifying Handles Button1Click Essentially, when a user clicks on the button named button1, this handler will be called This illustrates the concept of event-driven programming, where you write handlers, such as button1_Click, that run code according