单项选择题
A. a pseudora ndom generated number
B. its locally configured IPv4 address
C. the DHCP - supplied device ID
D. its MAC address
单项选择题 Refer to the exhibit. Based on this command output, what can we conclude about R3?（）
单项选择题 Refer to the exhibit. OSPF is running throughout the network. You want to minimize the propagation of LSAs into and out of A rea 1. Which OSPF feature would best achieve this goal? （）
单项选择题 The administrator wants to verify the current state of the OSPF database loading process. Which show command should the administrator use?（）