(Multiple Choice) The metropolitan area network which is located between backbone network and access network consists of ( ). (Select 3 Answers)
Access layer
Convergence layer
Carrier layer
Core layer
(Multiple Choice) When a backbone network uses dual planes, which of the following statements are true? (Select 2 Answers)
In normal situations, the services on the two planes do not affect each other.
When a fault occurs on one plane, the other plane cannot function as the backup of the faulty plane.
Compared with a dual-plane structure, a hierarchical plane is more reliable
The two planes generally carry different services.
(Single Choice) In a complete IP network, which of the following networks does a Layer 2 network under the service access control point belong to?
Access network
Metropolitan area network (MAN)
Core network
Backbone network
(Multiple Choice) Which of the following network topologies are the widely used backbone network topologies? (Select 2 Answers)
Plane and Space Hierarchical structure
Multi-homing structure
Full Mesh
Plane Hierarchical structure
(Multiple Choice) Which layers in OSI reference model belong to upper layer, also called as host layer and are responsible for data transmission and providing interface for user? (Select 3 Answers)
Data link layer 1 2 3
Network layer 2 3
Transport layer 3
Session layer 1
Presentation layer 1
Application layer 2
(Multiple Choice) Which of the following are advantages of layer 2 switch compared with hub? (Select 3 Answers)
Increase the collision
Higher throughput
Higher port density —
Isolate collision domains —
(Single Choice) Which of the following commands can be used to set Ethernet port so that buffer will not overflow when congestion occurs?
Flow on
Flow-control
Flow control
Enable flow-control —
