單項選擇題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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1.多項選擇題SONET’s three layers are（）.

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

2.單項選擇題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

3.多項選擇題Which methods would enable traffic to be forwarded along an MPLS TE tunnel？（）

A.MP-BGP routing
B.Static routing
C.Policy routing
D.Autoroute
E.Forwarding adjacency

5.單項選擇題When IPv6 is deployed by a Service Provider to bring on an IPv6 Enterprise， which transition strategyworks the best？（）

A.Deploy IPv6 at the Edges and tunnel Enterprise through the core
B.Deploy IPv6 at Edges and Core at the same time for smooth transition
C.Deploy IPv6 at the core first and then move to Edges toward the end customer
D.None of the above will work