单项选择题
A.A DHCP client uses a ping to detect address conflicts.(ARP)
B.A DHCP server uses a gratuitous ARP to detect DHCP clients.
C.A DHCP client uses a gratuitous ARP to detect a DHCP server.
D.If an address conflict is detected, the address is removed from the pool and an administrator must resolve the conflict.
E.If an address conflict is detected, the address removed from the pool for an amount of time configurable by the administrator.
F.If an address conflict is detected, the address is removed from the pool and will not be reused until server is rebooted.
单项选择题 Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as shown. At which OSI layer is the problem?（）
多项选择题 Refer to the exhibit. The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem?（）
单项选择题 Which port state is introduced by Rapid-PVST?（）