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?（）

单项选择题 A zone transfer occurs over which of the following ports?（）