单项选择题
A.ease of IP address assignment versus use of external routers
B.redundancy from trunking between distribution layer switches
C.provides first-hop redundancy to clients
D.allows inter-VLAN communication without requiring complexity of routing protocols
单项选择题 You work as a network engineer for . You study the exhibit carefully. What best describes the Cisco IOS IP SLA command and output in the exhibit？（）
单项选择题 You work as a network engineer for. You study the exhibit carefully. Which of these is true based upon the output shown in the command？（） Exhibit：
单项选择题 Whichoftheseistrueregardingtheconfigurationandapplicationofportaccesscontrollists？（）