单项选择题
A user reports they can no longer change the web browser home page. Which of the following is MOSTlikely the problem? （）
A. They are using the wrong WEP key.
B. They have been infected with malware.
C. They have lost Internet connectivity.
D. They need to update their network device drivers.
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A. A dead CMOS battery
B. The OS is not installed on the hard drive
C. A faulty RAM
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A user reports that their system is starting to run slower, especially when opening large local files. The system has sufficient RAM for the users applications, but the hard drive seems to have higher than normal activity when opening large files. Which of the following would be the BEST tool to diagnose and troubleshoot this problem? （）
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A customer reports they are unable to connect to any computers outside of the office and they are unable to connect to the Internet. When the technician runs ipconfig, the customer gets the following output: IP address169.254.2.4 Subnet Mask.255.255.0.0 Default Gateway. Which of the following could be causing the issue?（）
A. The subnet mask is not correctly configured.
B. The DNS client has not been configured on the computer.
C. The DHCP client is unable to obtain an IP address from the DHCP server.
D. The default gateway is not specified
