單項選擇題GMPLS is based upon Non-Packet-based devices.（）

A.True
B.False


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1.單項選擇題Which of the following is true regarding Label Distribution Protocol （LDP）？（）

A.It is a label distribution protocol for MPLS
B.It is a set of procedures and messages by which LSRs establish Label Switch Paths （LSPs） through a network
C.Tag distribution Protocol （TDP） was the basis for LDP
D.All of the above are true

3.單項選擇題What is the main difference between the information displayed on the dspload and the dsptrkutl screens？（）

A.The dspload screen is for all trunks； the dsptrkutl screen is for one trunk
B.The dspload screen shows the expected traffic； the dsptrkutl screen shows actual traffice
C.The information on the dspload screen never changes； the dsptrkutl screen is dynamic
D.The dspload screen shows historical information； the dsptrkutl screen shows current information

4.單項選擇題In a cable HFC plant， what is a modulator？（）

A.Set top box
B.Diplex filter
C.Local head end
D.Fiber node

5.單項選擇題What is the purpose of Dual Ring Interconnect with D C for SDH rings？（）

A.Protects signals when a ring switch fails
B.Protects signals when multiple span switches fail
C.Protects pre-emptible traffic from being dropped when a ring switch occurs
D.Protects signals against any combination of link failure in each ring