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1 B 80211a operates in the 5-GHz frequency range 2 A Early 80211 wireless networks ran at a maximum of 2 Mbps 3 C CSMA/CA uses the RTS/CTS protocol to provide data packet collision avoidance 4 D A unique SSID prevents wireless devices that do not have the same SSID from accessing the network 5 A, B Many wireless telephones and baby monitors operate in the same 24-GHz frequency range as 80211b wireless networking equipment and may cause interference Cell phones don t interfere with wireless networks Television remote controls use infrared signals 6 A, B, C WPA upgrades WEP to provide end-to-end data packet encryption, user authentication via EAP, and encryption key integrity checking 7 A, D A wireless access point or bridge enables you to connect wireless PCs to a wired network segment 8 B A wireless network with more than one access point is called EBSS, or Extended Basic Service Set 9 C A RADIUS server provides authentication through a user name and password encrypted with EAP 10 D WPA2 is the most secure because it uses Advanced Encryption Standard (AES), a 128-bit cipher that is harder to crack than the 128-bit TKIP wrapper used by WPA Both WPA and WPA2 are stronger than WEP WEP2 was never fully developed

The CompTIA Network+ certification exam expects you to know how to 45 Explain different methods and rationales for network performance optimization, such as fault tolerance 61 Explain the function of hardware and software security devices 62 Explain common features of a firewall 65 Explain issues that affect device security 66 Identify common security threats and mitigation techniques To achieve these goals, you must be able to Discuss the common security threats in network computing Describe methods for securing user accounts Explain how firewalls, NAT, port filtering, and packet filtering protect a network from threats

If CryptoCard is used for login to the CryptoCard database, leave the password blank and select OK You will then be prompted for Challenge/Response authentication 4Click the folder for the group to which the user will belong 5Select File | New | User 6Enter the new user's name and the serial number of the Card (RB-1 is the default) 7Make any necessary changes to Token, Keys, and Policy 8Select Apply and Initialize 9Follow the instructions, entering information into the Card (See the "User Profiles" bullet under "Other CryptoCard Settings," later in this chapter, for description of codes entered into the Card during initialization) 10Select Done The user is now ready to use the Token Card for authentication The initial PIN depends on Card configuration The user will be forced to change it during the Card's first use and may change it any time subsequently, using the CPIN key on the Card

All of the results from trigonometry using real variables carry over to complex variables We illustrate this in the next two examples EXAMPLE 45 Show that sin( x + iy) = sin x cos iy + cos x sin iy SOLUTION Using Euler s identity: sin( x + iy) = ei ( x+iy ) e i ( x+iy ) 2i ix y e e e ix e y = 2i (cos x + i sin x )e y (cos x i sin x )e y = 2i y y i sin x (e + e ) cos x (e y e y ) + = 2i 2i i ( iy ) i ( iy ) e +e ei ( iy ) e i ( iy ) + cos x = sin x 2 2i = sin x cos iy + cos x sin iy