單項(xiàng)選擇題When an MPLS Layer 2 VPN runs in the hub-and-spoke model, where is QoS implemented?()

A.hub and spoke
B.PE
C.CE
D.hub
E.spoke


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1.多項(xiàng)選擇題All secure domain routers (SDRs) have shared attribute and resources. Which three resources are sharedall SDRs? ()

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B.fabric cards
C.SNMP traps
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E.exec- level configuration

2.單項(xiàng)選擇題Which statement about VPLS is true?()

A.All CE devices emulate a bridge
B.All provider devices emulate a bridge
C.Hierarchical VPLS reduces signaling overhead
D.Each PE device emulates a bridge
E.Each CE device emulates a bridge

4.單項(xiàng)選擇題Which statement is FALSE concerning Concatenation?()

A.It allows ITCM to send multiple upstream packets in one single large burst.
B.It reduces upstream data throughput.
C.It can be enabled/disabled from CMTS on per upstream port basis if desired
D.Concatenation activity on an interface can be checked by the show controller counters command

5.單項(xiàng)選擇題In optical transmission systems, chirped lasers are used for the purpose of:().

A.Turning the laser to a specific ITU channel
B.Keeping the signal wavelength "locked" to a specific technology
C.Suppressing FWM and SBS non-linear effects
D.None ofthe above

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Which two routers support cable access?()

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What layer of the TMN (telecommunications management network) model does CTM fit into?()

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Assume that the PEs are separated by Multiple P routers.How many labels should the ingress PE push for BPE functionality?()

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Which three protocols use TLVs to carry attributes?()

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