2. 计算机
  3. 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 t

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 t

admin2009-05-19  30
问题 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 for this point to point link?
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
F. None of the above
选项
答案D
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, as no IP addresses are wasted.
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