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單項(xiàng)選擇題

For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork. Which protocol should be blocked with access control lists？（）

A.IP
B.ICMP
C.TCP
D.UDP

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多項(xiàng)選擇題

Which of the following are associated with the application layer of the OSI model？（two.）（）

A.ping
B.Telnet
C.FTP
D.TCP
E.IP

單項(xiàng)選擇題

Which type of attack is characterized by a flood of packets that are requesting a TCP connection to a server？（）

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

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