单项选择题 All of the following will interfere with a 2.4GHz wireless phone EXCEPT:（）

单项选择题 Which of the following devices could be configured as a DHCP server?（）

单项选择题 After a technician came out and installed a new wireless router, one of the wired workstations began having problems connecting to the file server. This is only an intermittent problem. Which of the following actions will the technician MOST likely perform to resolve this problem?（）