单项选择题

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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多项选择题

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

单项选择题

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

单项选择题

The command frame-relay map ip 10.121.16.8 102 broadcast was entered on the router. Which of the following statements is true concerning this command？（）

A.This command should be executed from the global configuration mode.
B.The IP address 10.121.16.8 is the local router port used to forward data.
C.102 is the remote DLCI that will receive the information.
D.This command is required for all Frame Relay configurations.
E.The broadcast option allows packets， such as RIP updates， to be forwarded across the PVC