单项选择题
What is known as "one-to-nearest" addressing in IPv6?（）
A. global unicast
B. anycast
C. multicast
D. unspecified address
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Which type of cable is used to connect the COM port of a host to the COM port of a router or switch?（）
A. crossover
B. straight-through
C. rolled
D. shielded twisted-pair -
单项选择题
Which Cisco Catalyst feature automatically disables the port in an operational PortFast upon receipt of a BPDU?（）
A. BackboneFast
B. UplinkFast
C. Root Guard
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单项选择题
How many bits are contained in each field of an IPv6 address?（）
A. 24
B. 4
C. 8
D. 16
