单项选择题

An attacker sends a low rate of TCP SYN segments to hosts， hoping that at least one port replies. Which type of an attack does this scenario describe？（）

A.DoS
B.SYN flood
C.port scanning
D.IP address sweep

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多项选择题

What are three main phases of an attack？（）

A.DoS
B.exploit
C.propagation
D.port scanning
E.reconnaissance

多项选择题

Which two statements about the use of SCREEN options are correct？（）

A.SCREEN options are deployed at the ingress and egress sides of a packet flow.
B.Although SCREEN options are very useful， their use can result in more session creation.
C.SCREEN options offer protection against various attacks at the ingress zone of a packet flow.
D.SCREEN options examine traffic prior to policy processing， thereby resulting in fewer resouces used formalicious packet processing.

多项选择题

Which two external authentication server types are supported by JUNOS Software for firewall user authentication？（）

A.RADIUS
B.TACACS+
C.LDAP
D.IIS