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多項(xiàng)選擇題What are two benefits of using NAT?（）

A.NAT protects network security because privat enetworks are not advertised.
B.NAT accelerates the routing process because no modifications are made on the packets.
C.Dynamic NAT facilitates connections from the outside of the network.
D.NAT facilitates end-to-end communication when IPsec is enable.
E.NAT eliminates the need to re-address all host that require extemal access.
F.NAT conserves addresses through host MAC-level multiplexing.

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1.單項(xiàng)選擇題What is the purpose using the traceroute command?（）

A.to map all the devices on a network.
B.to display the current TCP/IP configuration values.
C.to see how a device MAC address is mapped to its IP address.
D.to see the path a packet will take when traveling to a specified destination.
E.to display the MTU values for each router in a specified network path from source to a destination.

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2.單項(xiàng)選擇題On which types of network will OSPF elect a backup designated router（）。

A.point-to-point and multiaccess
B.point-to-multipoint and multiaccess
C.point-to-point and point-to-multipoint
D.nonbroadcast and broadcast multipoint
E.nonbroadcast and broadcast multiaccess

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3.單項(xiàng)選擇題Which type of attack is characterized by flood of packet that requesing a TCP connection to a server?（）

A.denial of service
B.brute force
C.reconnaissance
D.Trojan horse

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4.單項(xiàng)選擇題Which item represents the standard IPACL？（）

A.access-list 50 deny 192.168.1.10.0.0.255
B.access-list 110 permit ip any any
C.access-list 2500 deny tcp any host 192.168.1.1 eq22
D.access-list 101 deny tcp any host 192.168.1.1

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5.單項(xiàng)選擇題What is the default routing update period for RIPv2?（）

A.15 seconds
B.30 seconds
C.180 seconds
D.240 seconds

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