cisco的ccna题的拷贝
A.Interface S0/0 . the router is down. B.Interface Fa1/0 . the router is down.C.Interface Fa0/5 . Switch3 is down.
D.Interface Fa0/4 . Switch3 is down.
E.Switch 1 is turned off.
F.Switch 3 is turned off.
Correct:B
23.Which address represents a unicast address?
A.224.1.5.2
B.FFFF.FFFF.FFFF
C.192.168.24.59/30
D.255.255.255.255
E.172.31.128.255/18
Correct:E
24.How does replacing a hub with a switch affect CSMA/CD behavior in an Ethernet network?
A.It effectively eliminates collisions.
B.In increases the> C.It decreases the amount of time that a jam signal must be sent to reach all network devices.
D.It reduces the total amount of bandwidth available to each device.
E.It eliminates Layer 3 broadcast traffic.
Correct:A
25.Access list 1 has been written to allow host 172.16.1.224 access to the router vty lines. What command would assign this access list to the virtual terminal lines?
A.router(config-line)# ip access-group 1 in
B.router(config-line)# access-class 1 in
C.router(config-line)# ip access-list 1 in
D.router(config-line)# access-line 1 in
Correct:B
26.A Catalyst 2950 needs to be reconfigured. What steps will ensure that the old configuration is erased? (Choose three.)
A.Erase flash.
B.Restart the switch.
C.Delete the VLAN database.
D.Erase the running configuration.
E.Erase the startup configuration.
F.Modify the configuration register.
Correct:B C E
27.Refer to the exhibit. Switch-1 needs to send data to a host with a MAC address of 00b0.d056.efa4. What will Switch-1 do with this data?
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