assuming the default switch configuration which vlan ra……

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

A. (config-if)#authentication ppp chap fallback ppp
B. (config-if)#authentication ppp chap pap
C. (config-if)#ppp authentication chap pap
D. (config-if)#ppp authentication chap fallback ppp

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