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  3. 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 mas

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 mas

admin2009-05-19  41
问题 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
选项
答案B
解析 Explanation:
For a single point to point link, only 2 IP addresses are required, one for the serial interface of the router at each end. Therefore, the 255.255.255.252 subnet mask is often used for these types of links because no IP addresses are wasted. The subnet mask 255.255.255.252 is a /30, so answer B is correct.

Incorrect Answers:
A. The largest mask that can be used is the single IP host mask, which is /32. It is not possible to use a /38 mask, unless of course IPv6 is being used.

C, D, E. These masks will provide for a larger number of host addresses, and since only 2 IP addresses are needed for a point to point link, these extra addresses are wasted.

F: No available host addresses with a /32 mask
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