单项选择题
A. Phishing
B. Smurf attack
C. Denial of service
D. Man-in-the-middle
单项选择题 Which of the following protocols should be used to monitor network performance?（）
单项选择题 An administrator is setting up a security camera that will send the same feed to twelve of the twenty workstations on the network. Which of the following addressing schemes was designed for this scenario?（）
单项选择题 A technician claims to have crimped a patch cable according to the T568A standard on one end and T568B on the other. Which of the following results is to be expected?（）