如果DHCP客户端申请的IP地址已经被占用时,DHCP服务器会使用报文作为应答()
A. DHCP ACK
B. DHCP RELEASE
C. DHCP NAK
DHCP DISCOVER
IPv6报文头比IPv4报文头增加了字段()
A. Version
B. Flow Label
C. Destination Address
D. Source Address
下列属于内置的域本地组的是()
A. Print Operators
B. Replicators
C. Users
D. Account Operators