which command is used to enable CHAP authentication whit PAP as the fallback method on a serial interface?（）

单项选择题Which parameter or parameters are used to calculate OSPF cost in cisco routers?（）

A. Bandwidth,Delay,and MTU
B. Bandwidth
C. Bandwidth and MTU
D. Bandwidth , MTU,Reliability,Delay,and Load

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

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