单项选择题
A.It monitors messages from the external server and updates the routing table as needed.
B.It maintains the leases for the DHCP server and reassigns addresses to new subscribers.
C.It sends keepalives to the subscriber and makes the address available when the subscriber stops responding.
D.It sends keepalives to the subscriber and removes the host route when the subscriber stops responding.
单项选择题 In a Routed 1483 network which method of routing is typically employed on the DSL router？（）
多项选择题 A Bridged 1483 service offering is grouping DSL users into a large subnet.What are three characteristics of this configuration?（）
单项选择题 How does the ERX Edge Router interact with an external DHCP server in a Bridged 1483 network？（）