单项选择题
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
点击查看答案
相关考题
-
单项选择题
Which IPv6 address is valid?（）
A. 2031:0:130F::9C0:876A:130B
B. 2001:0DB8:0000:130F:0000:0000:08GC:140B
C. 2001:0DB8:0:130H::87C:140B
D. 2031::130F::9C0:876A:130B -
单项选择题
Which of the following protocols uses both TCP and UDP ports?（）
A. SMTP
B. Telnet
C. FTP
D. DNS -
单项选择题
Which command enhances the 802.1D convergence time on ports that are connected to hosts?（）
A. spanning-tree backbonefast
B. spanning-tree uplinkfast
C. spanning-tree portfast
D. spanning-tree cost512
