cisco的ccna题的拷贝（3）
A.The serial cable . R1 needs to be replaced. B.The interfaces . R2 are not configured properly.C.R1 has no route to the 192.168.1.128 network.
D.The IP addressing scheme has overlapping subnetworks.
E.The ip subnet-zero command must be configured . both routers.
Correct:C
15.Which form of NAT maps multiple private IP addresses to a single registered IP address by using different ports?
A.static NAT
B.dynamic NAT
C.overloading
D.overlapping
E.port loading
Correct:C
16.What should be part of a comprehensive network security plan?
A.Allow users to develop their own approach to network security.
B.Physically secure network equipment from potential access by unauthorized individuals.
C.Encourage users to use personal information in their passwords to minimize the likelihood of passwords being forgotten.
D.Delay deployment of software patches and updates until their effect . end-user equipment is well known and widely reported.
E.Minimize network overhead by deactivating automatic antivirus client updates.
Correct:B
17.A single 802.11g access point has been configured and installed in the center of a square office. A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency. What are three likely causes of this problem? (Choose three.)
A.mismatched TKIP encryption
B.null SSID
C.cordless phones
D.mismatched SSID
E.metal file cabinets
F.antenna type or direction
Correct:C E F
18.What two actions must a router take in order to route incoming packets? (Choose two.)
A.Identify the destination network address of each packet.
B.Identify the source network address of each packet.
C.Validate sources of routing information.
D.Inspect the routing table to select the best path to the destination network address.
E.Verify the receipt of routed packets by the next hop router.
F.Inspect the ARP table to verify a legitimate source MAC address for each packet.
Correct:A D
19.Refer to the exhibit. What is the effect of the configuration that is shown?
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