单项选择题

You have a network that supports VLSM and you need to reduce IP address waste in your point to point WAN links. Which of the masks below would you use?（）

A./38
B./30
C./27
D./23
E./18
F./32

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单项选择题

You have a single Class C IP address and a point-to-point serial link that you want to implement VLSM on. Which subnet mask is the most efficient?（）

A. 255.255.255.0
B. 255.255.255.240
C. 255.255.255.248
D. 255.255.255.252
E. 255.255.255.254

单项选择题

On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?（）

A. Deleting unusable addresses through the creation of many subnets.
B. Combining routes to multiple networks into one supernet.
C. Reclaiming unused space by means of changing the subnet size.
D. Calculating the available host addresses in the AS.

单项选择题

Which one of the following varieties of NAT utilizes different ports to map multiple IP addresses to a single globally registered IP address?（）

A. Static NAT
B. Port loading
C. NAT Overloading
D. Dynamic NAT
E. None of the above