单项选择题
A network engineer wants to allow a temporary entry for a remote user with a specific usename and password so that the user can access the entire network over the internet.which ACL can be used?（）
A. reflexive
B. extended
C. standard
D. dynamic
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单项选择题
Which term describes a spanning-tree network that has all switch ports in either the blocking or forwarding state?（）
A. redundant
B. spanned
C. provisioned
D. converged -
单项选择题
Which PPP subprotocol negotiates authentication options?（）
A. NCP
B. LCP
C. ISDN
D. DLCI
E. SLIP -
单项选择题
You are working in a data center environment and are assigned the address range 10.188.31.0/23.You are asked to develop an IP addressing plan to allow the maximum number of subnets with as many as 30 hosts each.Which IP address range meets these requirements?（）
A. 10.188.31.0/27
B. 10.188.31.0/26
C. 10.188.31.0/29
D. 10.188.31.0/28
E. 10.188.31.0/25
