cisco的ccna题的拷贝（5）

xiu12

Correct:　　Green choice10---->Yellow Choice1
　　Green choice2---->Yellow Choice2
　　Green choice5---->Yellow Choice3
　　Green choice3---->Yellow Choice4
　　Green choice8---->Yellow Choice5
　　7.Which Layer 4 protocol is used for a Telnet connection?
　　A.IP
　　B.TCP
　　C.UDP
　　D.ICMP
　　E.DNS
　　Correct:B
　　8.What is the subnet address of 172.16.159.159/22?
　　A.172.16.0.0
　　B.172.16.128.0
　　C.172.16.156.0
　　D.172.16.159.0
　　E.172.16.159.128
　　F.172.16.192.0
　　Correct:C
　　9.What is the purpose of flow control?
　　A.to ensure data is retransmitted if an acknowledgment is not received
　　B.to reassemble segments in the correct order at the destination device
　　C.to provide a means for the receiver to govern the amount of data sent by the sender

　　D.to regulate the>　　Correct:C
　　10.During the boot sequence, a 2600 series router needs to locate and load an operating system. What is the default order the router uses to find an operating system?
　　A.Flash, TFTP server, ROM
　　B.Flash, TFTP server, RAM
　　C.Flash, NVRAM, TFTP server
　　D.ROM, TFTP server, Flash
　　E.Flash, ROM, TFTP server
　　Correct:A
　　11.What is the subnet address for the IP address 172.19.20.23/28?
　　A.172.19.20.0
　　B.172.19.20.15
　　C.172.19.20.16
　　D.172.19.20.20
　　E.172.19.20.32
　　Correct:C
　　12.Which two statements describe the IP address 10.16.3.65/23? (Choose two.)
　　A.The subnet address is 10.16.3.0 255.255.254.0.
　　B.The lowest host address in the subnet is 10.16.2.1 255.255.254.0.
　　C.The last valid host address in the subnet is 10.16.2.254 255.255.254.0
　　D.The broadcast address of the subnet is 10.16.3.255 255.255.254.0.
　　E.The network is not subnetted.
　　Correct:B D
　　13.An administrator issues the show ip interface s0/0 command and the output displays the line Serial0/0 is up, line protocol is upWhat does "line protocol is up" specifically indicate about the interface?
　　A.Keepalives are being received . the interface.
　　B.The cable is attached properly.
　　C.CDP has discovered the connected device.
　　D.A carrier detect signal has been received from the connected device.
　　E.IP is correctly configured . the interface.
　　Correct:A
　　14.The Hub and Spoke routers are directly connected through their serial interfaces for purposes of testing. Based . the output shown in the exhibit, what must be done to make the serial line operational?