单项选择题
Which of the following protocols uses both TCP and UDP ports?（）
A. SMTP
B. Telnet
C. FTP
D. DNS
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相关考题
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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 -
单项选择题
Which IEEE standard protocol is initiated as a result of successful DTP completion in a switch over FastEthernet?（）
A. 802.3ad
B. 802.1w
C. 802.1Q
D. 802.1d -
单项选择题
Which command helps a network administrator to manage memory by displaying flash memory and NVRAM utilization?（）
A. show secure
B. show file systems
C. show flash
D. show version
