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多項(xiàng)選擇題What information does a router running a link-state protocol use to build and maintain its topological database？（）

A. hello packets
B. SAP messages sent by other routers
C. LSAs from other routers
D. beacons received on point-to-point links
E. routing tables received from other link-state routers
F. TTL packets from designated routers

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1.單項(xiàng)選擇題 Refer to the exhibit.HostA cannot ping HostB.Assuming routing is properly configured，what could be thecause of this problem？（）

A.HostA is not on the same subnet as its default gateway
B.The address of SwitchA is a subnet address
C.The Fa0/0 interface on RouterA is on a subnet that cannot be used
D.The serial interfaces of the routers are not on the same subnet
E.The Fa0/0 interface on RouterB is using a broadcast address

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2.單項(xiàng)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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3.單項(xiàng)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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4.單項(xiàng)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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5.單項(xiàng)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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