单项选择题
When debugging a routing problem, the time-to-live (TTL) value can be used to determine:（）
A. Number of routes available.
B. Number of router hops.
C. Time that an advertised route is valid.
D. Time to make a round trip.
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An administrator has found interference on a network. Which of the following cable types is thenetwork MOST likely composed of?（）
A. UTP
B. Fiber
C. RG-6
D. STP -
单项选择题
Which of the following cable types has a MAXIMUM transmission speed of 10Mbps?（）
A. CAT6
B. CAT5
C. Single-mode fiber
D. CAT3 -
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Which of the following layers is associated with the physical hardware address of a network node?（）
A.Layer 1
B.Layer 2
C.Layer 6
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