單項選擇題In the implementation of VLSM techniques on a network using a single Class C IP address, which subnet  mask is the most efficient for point-to-point serial links? ()

A.255.255.255.0
B.255.255.255.240
C.255.255.255.248
D.255.255.255.252
E.255.255.255.254


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3.單項選擇題A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?()

A.This is a 10 Mb/s switch port.
B.This is a 100 Mb/s switch port.
C.This is an Ethernet port operating at half duplex.
D.This is an Ethernet port operating at full duplex.
E.This is a port on a network interface card in a PC

4.單項選擇題Which spread spectrum technology does the 802.11b standard define for operation?()

A.IR
B.DSSS
C.FHSS
D.DSSS and FHSS
E.IR, FHSS, and DSSS 

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