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FEC
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考题
关于FEC的说法,正确的有()。A、支持FEC和不支持FEC功能的设备不能直接互通B、FEC可分为带外FEC和带内FECC、AFEC与FEC也不能互通D、AFEC比FEC更加降低系统对OSNR的要求
考题
What is the role of Forwarding Equivalence Class (FEC) in MPLS?()A、FEC determines how IP packets are forwarded in MPLS LSP.B、FEC determines how to establish an LSP path.C、FEC determines how a group of IP packets are mapped to an LSP.D、FEC determines how MPLS labels are stacked in LSP.E、None of above.
考题
Which three are valid IPv6 interface addresses?()A、FEC0:0:9000:0:9376:0:ABCD://EF12/128B、FEC0:0:0:2000:10FF://9472:94FA:3490/128C、FEC0:0:9500:0:59AB:BC12:94583:99CF/128D、FEC0:FEC0:0:FEC0:1234:4321:7890:978/128E、FEC0:0:9500:0:59AB:EEC12:ABCD://99CF/128
考题
Which two statements about forwarding equivalence class (FEC) are true?()A、FEC might correspond to a destination IP subnet, but it might also correspond to any traffic class that the edge LSR considers significant.B、FEC is a group of IP packets that is forwarded over a different path, but with the same forwarding treatment.C、FEC is a group of IP packets that is forwarded over the same path, and with the same forwarding treatment.D、FEC is a group of IP packets that is forwarded over a different path, but with the different forwarding treatment.E、FEC is a group of IP packets that is forwarded over the same path, but with a different forwarding treatment
考题
某LSR运行在DU的标签分配模式、有序的标签控制模式下,下列说法正确的是()。A、该LSR收到了上游LSR针对某FEC的标签分配请求,且该LSR是该FEC的最下游设备时才可以为该FEC分配标签B、该LSR收到了下游设备针对某FEC的label mapping消息时就可以为该FEC分配标签,无需等待上游的标签分配请求C、该LSR是某FEC的最下游设备就可以为该FEC分配标签,无需等待上游的标签分配请求D、该LSR只要收到上游设备针对某FEC的标签分配请求就可以为该FEC分配标签
考题
编码增益是衡量前向纠错编码(FEC)纠错能力的参数。关于编码增益,以下说法错误的是()。A、在保持误码率恒定条件下,采用纠错编码所节省的信噪比称为编码增益;B、编码增益越大,说明FEC纠错能力越强;C、带内FEC的编码增益比带外FEC的编码增益大;D、AFEC的编码增益比FEC的编码增益大。
考题
OUT10G类的单板都带有FEC功能,下面不正确的是()A、OTU10G单板和OTUE10G单板可以在FEC层面互通B、TU10G单板和OTUE10G单板不能在FEC层面互通C、无论何种应用,OUT10GG单板只能工作在编解码方式下D、DWDM的OTU10G类单板有多个版本,目前支持FEC的标准有G.957和G.709
考题
对于ZXWM-M900设备目前提供的2.5G双向中继板OTUFG,对其端口说明错误的是()。A、IN1/OUT1口对应一个方向,IN2/OUT2口对应一个方向;B、IN1/OUT1口接收和发送为带FEC信号,而IN2/OUT2口接收和发送为不带FEC信号;C、IN1口接收到的为不带FEC的信号,经过OUT1编码后输出带FEC的信号;D、IN2口接收到的是带FEC的型号,而经过OUT2口解码后输出为不带FEC的信号。
考题
名词解释题前向纠错(FEC)
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