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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单项选择题
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
D. BPDU Guard
E. BPDU Filter
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