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单选题
Layer 3 （the network layer） provides connectivity and path selection between two host systems that may be located on geographically separated networks. Which two devices operate at the network layer？（）
A
application
B
hub
C
switch
D
bridge
E
router
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考题
单选题At which OSI layer is a logical path created between two host systems（）。A
sessionB
transportC
networkD
data linkE
physical
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