单项选择题

What is the effect of turning on all available downstream carrier tones in a DMT DSL transmissionsystems？（）

A.Downstream RS error correction effectiveness is reduced
B.The downstream line rate and throughput remains unchanged， but FEC efficiency is reduced
C.The upstream DSL bandwidth is reduced， since less carriers become available for upstream traffic
D.The downstream DSL bandwidth is increased

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单项选择题

Which statement is FALSE concerning the interleave depth value？（）

A.A higher interleave depth provides more protection from burst of noise on the HFC network
B.Higher interleave depth increase downstream latency
C.Lower interleave depth cause some packet loss on typical HFC networks
D.None ofthe above

多项选择题

Which two IOS commands are equivalents for putting a Cisco 7500 OC-12 RPR interface card intowrapped mode？（）

A.shutdown [a b]
B.srp shutdown [a b]
C.srp ips request manual-switched [a b]

单项选择题

BGP best route selection process is based on path attributes.（）

A.True
B.False