名词解释题FEC
名词解释题
FEC
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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
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.
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
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
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
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。
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
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。
名词解释题前向纠错(FEC)