單項(xiàng)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. 255.255.255.240
B. 255.255.255.254
C. 255.255.255.252
D. 255.255.255.0
E. 255.255.255.248


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1.單項(xiàng)選擇題Which IPv6 address is valid?（）

A. 2031:0:130F::9C0:876A:130B
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C. 2001:0DB8:0:130H::87C:140B
D. 2031::130F::9C0:876A:130B

2.單項(xiàng)選擇題Which of the following protocols uses both TCP and UDP ports?（）

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3.單項(xiàng)選擇題Which command enhances the 802.1D convergence time on ports that are connected to hosts?（）

A. spanning-tree backbonefast
B. spanning-tree uplinkfast
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5.單項(xiàng)選擇題Which command helps a network administrator to manage memory by displaying flash memory and NVRAM utilization?（）

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