A.LR

B.WRED

C.GTS

D.CAR

A.Necessity

B.Costs

C.Feasibility

D.Risks

A.True

B.False

A.Network LSA is generated by ABR.

B.Network LSA is flooded in the whole AS.

C.DR uses Network LSA to describe routers that have established adjacency relation with it in the network.

D.Only the router which connects NBMA or Broadcast Network may generate Network LSA.

A.When network topology is stable, BPDU packets will be transmitted periodically.

B.When network topology is stable, the Designated Port sends BPDU packet at every Hello Time interval.

C.When the port does not receive new BPDU within a certain interval, the old configuration BPDU will time out and the link failure can be detected.

D.The port sends Configuration BPDU at every Hello Time interval. When the link fails, Configuration BPDU cannot be sent out. As a result, this port can detect the link failure.