Which two states are the port states when RSTP has converged?（）

A.blocking
B.learning
C.disabled
D.forwarding
E.listening

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Which commands are required to properly configure a router to properly configure a router to run OSPFand to add network 192.168.16.0/24 to OSPF area 0？（）

A.Router（config）#router ospf 1
B.Router（config）#router ospf 0
C.Router（config）#router ospf area 0
D.Router（config-router）#network 192.168.16.0 0.0.0.255 area 0
E.Router（config-router）#network 192.168.16.0 0.0.0.255 0
F.Router（config-router）#network 192.168.16.0 255.255.255.0 area 0

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How many addresses for hosts will the network 124.12.4.0/22 provide?（）

A.510
B.1022
C.1024
D.2048

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Which statement about vlan operation on cisco catalyst switches is true？（）

A.when a packet is received from an 802.1Q trunk，the vlan id can be determined from the source MAC address table
B.unkown unicast frames are retransmitted only to the ports that belong to the same vlan
C.ports between switches should be configured in access mode so that vlans can span across the ports
D.broadcast and multicast frames are retransmitted to ports that are configured on different vlan

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