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單項(xiàng)選擇題

The technician notices that one of the wires in a CAT5 cable is cut in half. Which of the followingconnectivity issues did the technician discover?（）

A.Open pairs
B.Attenuation
C.Crosstalk
D.Interference

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單項(xiàng)選擇題

Which of the following cable types is intended to be used on short distances and is immune to anytype of interference?（）

A. Singlemode fiber
B. Multimode fiber
C. Shielded twisted pair
D. Unshielded twisted pair

單項(xiàng)選擇題

Which of the following protocols requests membership to a multicast group?（）

A.IGMP
B.SNMP
C.SMTP
D.ICMP

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