單項(xiàng)選擇題

With the DSCP value fo "101110"， what does the "11" in bits 1 and 2 indicate ？（）

A.AF Class
B.Drop Probability
C.CS（Class Selector Value ）
D.PHB （Per-Hop Behavior ）
E.IP Precedence
F.Queue Depth

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多項(xiàng)選擇題

SONET’s three layers are（）.

A.Section
B.Line
C.Frame
D.Path
E.DS1

單項(xiàng)選擇題

Which of the following descriptions about IP spoofing is correct？（）

A.IP source address is forged
B.IP destination address is forged
C.IP TCP source port is forged
D.IP TCP destination port is forged
E.None of above