单项选择题
A. RARP request
B. Show Network Address request
C. Proxy ARP request
D. ARP request
E. Show Hardware Address request
单项选择题 Which network protocol does DNS use?（）
单项选择题 Which statement describes the process of dynamically assigning IP addresses by the DHCP server?（）
单项选择题 On corporate network, hosts on the same VLAN can communicate with each other, but they are unable to communicate with hosts on different VLANs. What is needed to allow communication between the VLANs?（）