多项选择题

Which of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?（）

A. designated ports.
B. duplex operating mode.
C. fast mode ports.
D. root bridge.
E. root ports.
F. BDPU priority.

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单项选择题

What is the subnetwork number of a host with an IP address of 172.16.210.0/22?（）

A. 172.16.42.0
B. 172.16.107.0
C. 172.16.208.0
D. 172.16.252.0
E. 172.16.254.0

多项选择题

Which statements describe the routing protocol OSPF?（）

A. It supports VLSM.
B. It is used to route between autonomous systems.
C. It confines network instability to one area of the network.
D. It increases routing overhead on the network.
E. It allows extensive control of routing updates.
F. It is simpler to configure than RIP v2.

单项选择题

On point-to-point networks, OSPF hello packets are addressed to which address?（）

A.127.0.0.1
B.172.16.0.1
C.192.168.0.5
D.223.0.0.1
E.224.0.0.5
F.254.255.255.255