单项选择题

At which layer of the OSI model dose PPP perform?（）

A.Layer 3
B.Layer 4
C.Layer 2
D.Layer 5

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单项选择题

Which protocol is an open standard protocol framework that is commonly used in VPNs,to provid secure end-to-end communication?（）

A. L2TP
B. IPsec
C. PPTP
D.RSA

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

Refer to the exhibit.Statements A,B,C,and D of ACL 10 have been entered in the shown order and appled to interface E0 inbound,to prevent all hosts(except those whose addresses are the first and last IP of subnet 172.21.1.128/28) from accessing the network.But as is,the ACL dose not restrict anyone from the network.How can the ACL statements be re-arranged so that the system works as intended?（）

A.CDBA
B.DBAC
C.ACDB
D.BADC