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Correct Answer: D

The tag is used to specify each cell of the table. It can be used only within a row in a table. The ROWSPAN attribute of the tag specifies the number of rows that a cell spans over in a table. Since, the first cell of the table spans over three

rows, Sam will use specifies the number of columns that the head row contains.

Answer: C is incorrect.

Answer: A, B are incorrect. There are no attributes such as SPAN and SPANWIDTH for the tag.

Correct Answer: B

Default shares should be disabled, unless they are absolutely needed. They pose a significant security risk by providing a way for an intruder to enter your machine.

Answer: A is incorrect. Whether this is a domain server, a DHCP server, a file server, or database server does not change the issue with shared drives/folders.

Answer: C is incorrect. They cannot be hidden. Shared folders are, by definition, not hidden but rather available to users on the network.

Answer: D is incorrect. These are not necessary for Windows Server operations.

Correct Answer: D

In Unix, the /etc/fstab file is used by system administrators to list the filesystems that are mounted automatically at startup by the mount 璦 command (in /etc/rc or its equivalent startup file). Answer: C is incorrect. In Unix, the /etc/mtab file contains a list of the currently mounted file systems. This is set up by the boot scripts and updated by the mount command. Answer: A is incorrect. In Unix, the /etc/named.conf file is used for domain name servers. Answer: B is incorrect. In Unix, the /etc/groups file contains passwords to let a user join a group.

Correct Answer: B

WPA with 802.1X authentication provides best wireless security mechanism. 802.1X authentication, also known as WPA-Enterprise, is a security mechanism for wireless networks. 802.1X provides port-based authentication, which involves communications between a supplicant, authenticator, and authentication server. The supplicant is often software on a client device, the authenticator is a wired Ethernet switch or wireless access point, and an authentication server is generally a RADIUS database. The authenticator acts like a security guard to a protected network. The supplicant (client device) is not allowed access through the authenticator to the protected side of the network until the supplicant's identity is authorized. With 802.1X port-based authentication, the supplicant provides credentials, such as user name/password or digital certificate, to the authenticator, and the authenticator forwards the credentials to the authentication server for verification. If the credentials are valid, the supplicant (client device) is allowed to access resources located on the protected side of the network.

Answer: A is incorrect. Wired equivalent privacy (WEP) uses the stream cipher RC4 (Rivest Cipher). WEP uses the Shared Key Authentication, since both the access point and the wireless device possess the same key. Attacker with enough

Initialization Vectors can crack the key used and gain full access to the network.

Answer: D is incorrect. WPA-PSK is a strong encryption where encryption keys are automatically changed (called rekeying) and authenticated between devices after a fixed period of time, or after a fixed number of packets has been

transmitted.

Answer: C is incorrect. WAP uses TKIP (Temporal Key Integrity Protocol) to enhance data encryption, but still vulnerable to different password cracking attacks.

Correct Answer: D

In Unix, the /etc/sudoers file contains a list of users with special privileges along with the commands that they can execute. Answer: A is incorrect. In Unix, the /proc/meminfo file shows information about the memory usage, both physical and swap. Answer: B is incorrect. In Unix, the /etc/sysconfig/amd file is the configuration filethat is used to configure the auto mount daemon. Answer: C is incorrect. In Unix, the /proc/modules file shows the kernel modules that are currently loaded.