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單項選擇題As a network administrator, you have been instructed to prevent all traffic originating on the LAN from entering the R2 router. Which the following command would implement the access list on the interface of the R2 router?（）

A.access-list 101 in
B.access-list 101 out
C.ip access-group 101 in
D.ip access-group 101 out

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1.單項選擇題A network administrator wants to add a line to an access list that will block only Telnet access by the hosts on subnet 192.168.1.128/28 to the server at 192.168.1.5. What command should be issued to accomplish this task?（）

A.access-list 101 deny tcp 192.168.1.128 0.0.0.15 192.168.1.5 0.0.0.0 eq 23 access-list 101 permit ip any any
B.access-list 101 deny tcp 192.168.1.128 0.0.0.240 192.168.1.5 0.0.0.0 eq 23 access-list 101 permit ip any any
C.access-list 1 deny tcp 192.168.1.128 0.0.0.255 192.168.1.5 0.0.0.0 eq 21 access-list 1 permit ip any any
D.access-list 1 deny tcp 192.168.1.128 0.0.0.15 host 192.168.1.5 eq 23 access-list 1 permit ip any any

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2.單項選擇題Which spread spectrum technology does the 802.11b standard define foroperation？（）

A.IR
B.DSSS
C.FHSS
D.DSSS and FHSS
E.IR，F(xiàn)HSS，and DSSS

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3.單項選擇題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

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4.單項選擇題Refer to the exhibit,a network administrator cannot establish a telnet session with the indicated router.What is the cause of this failure?（）

A.A level 5 password is not set
B.The vty password is missing
C.The console password is missing
D.An ACL is blocking Telnet access

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5.多項選擇題Which two subnetworks would be included in the summarized address of 172.31.80.0 /20？（）

A.172.31.17.4/30
B.172.31.51.16/30
C.172.31.64.0/18
D.172.31.80.0/22
E.172.31.92.0/22
F.172.31.192.0/18

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