单项选择题

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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单项选择题

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

单项选择题

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

单项选择题

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