多项选择题
A. It is locally significant.
B. It is globally significant.
C. It is needed to identify a unique instance of an OSPF database.
D. It is an optional parameter required only if multiple OSPF processes are running on the router.
E. All routers in the same OSPF area must have the same process ID if they are to exchange routing information.
多项选择题 To configure the VLAN trunking protocol to communicate VLAN information between two switches, what two requirements must be met?（）
多项选择题 Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true?（）
多项选择题 When a DHCP server is configured, which two IP addresses should never be assignable to hosts?（）