单选题If a user attempts to go to a website and notices the URL has changed， which of the following attacks is MOST likely the cause？（）A DLL injectionB DDoS attackC DNS poisoningD ARP poisoning

第1题：

An end user reports that their computer is not performing as fast as it used to and it shuts down unexpectedly. Which of the following is the MOST likely cause?（）

• A、Network data cables are damaged.
• B、Memory has become unseated.
• C、The user has defragmented the hard drive.
• D、Processor cooling fan is not functioning.

第2题：

A user reports that the Windows update function will not run on the computer but the Internet can be accessed. The user is running an original version of Windows XP Professional. Which of the following is MOST likely the cause？（）

• A、The user has not registered the copy of Windows.
• B、The user has not applied at least Service Pack 1 to their system.
• C、The user does not know what site to access for the updates.
• D、The user needs to flush the DNS cache.

第3题：

第4题：

A user is attempting to access a website but is getting a ‘Page cannot be displayed’ error. The technician checks the IP address of the computer and sees that it has been assigned 169.254.10.70. Which of the following is the MOST likely cause?（）

• A、The device is located behind a firewall.
• B、The network card is disabled.
• C、The device is not configured for DHCP.
• D、The device cannot locate a DHCP server.

第5题：

Observe the following options carefully， which two attacks focus on RSA？ （）

• A、BPA attack
• B、Adaptive chosen ciphertext attack
• C、DDoS attack
• D、Man-in-the-middle attack

第6题：

A user has changed their password using the passwd command， and notices that the change is only made tothe local node. When the administrator changes the user’s password from the command line using the passwd command thechange is made cluster-wide. What is the most likely cause of this problem？（）

• A、The user has a UID less than 200
• B、The user has been defined as an administrative user
• C、The file /usr/es/sbin/cluster/clpasswd is not executable by the user
• D、The user needs explicit authorization to change their password cluster-wide

第7题：

A user states that the LCD display on their laptop has intermittent lines on the screen. The technician notices that when the display panel is moved, the line appears and then disappears. Which of the following is the MOST likely cause?（）

• A、The hinge on the display panel is damaged.
• B、The display cable is loose or damaged.
• C、The display panel is defective.
• D、The video controller on the system board is defective.

第8题：

After a technician replaces a laptop display, the technician now notices that the wireless no longer works. Which of the following would be the MOST likely cause？（）

• A、The wireless switch was damaged during the display installation.
• B、The network card has failed.
• C、The new display is interfering with the wireless signal.
• D、The antenna connector was not reconnected.

第9题：

A user explains that after the office was vacuumed the previous night their sound is not working and they cannot get onto the network. The user has verified that all of the PC’s cables are plugged into their respective ports. Which of the following is the MOST likely cause?（）

• A、Frayed or broken cables
• B、UPS is unplugged
• C、NIC and sound card are disabled in Device Manager
• D、Speakers are muted

第10题：

A user reports that they are unable to reach a particular website. The user had no issues reaching the site earlier in the day. Which of the following is the MOST likely cause of the lack of access？（）

• A、The VLAN is misconfigured
• B、The user has an improperly configured NIC
• C、The DHCP server is down
• D、The DNS server is down