如下图所示,某校园网用10Gbps的POS技术与CERNET相连,POS接口的帧格式是SDH,下列R1的POS 3/0接口配置,正确的是( )。

admin2014-04-03  37

问题 如下图所示,某校园网用10Gbps的POS技术与CERNET相连,POS接口的帧格式是SDH,下列R1的POS 3/0接口配置,正确的是(  )。

选项 A、 Router (config)#interface pos3/0
Router (config-if)#description To CERNET
Router (config-if)#bandwidth 10000
Router (config-if)#ip address 222.38.69.78 255.255.255.252
Router (config-if)#crc 64
Router (config-if)#pos framing sdh
Router (config-if)#no ip directed-broadcast
Router (config-if)#pos flag s1s0 2
Router (config-if)#no shutdown
Router (config-if)#exit
Router (config)#
B、Router (config)#interface pos3/0
Router (config-if)#description To CERNET
Router (config-if)#bandwidth 10000000
Router (config-if)#ip address 222.38.69.78 255.255.255.252
Router (config-if)#crc 16
Router (config-if)#pos framing sdh
Router (config-if)#no ip directed-broadcast
Router (config-if)#pos flag s1s0 0
Router (config-if)#no shutdown
Router (config-if)#exit
Router (config)#
C、Router (config)#interface pos3/0
Router (config-if)#description To CERNET
Router (config-if)#bandwidth 10000000
Router (config-if)#ip address 222.38.69.78 0.0.0.3
Router (config-if)#crc 32
Router (config-if)#pos framing sdh
Router (config-if)#no ip directed-broadcast
Router (config-if)#pos flag s1s0 2
Router (config-if)#no shutdown
Router (config-if)#exit
Router (config)#
D、 Router (config)#interface pos3/0
Router (config-if)#description To CERNET
Router (config-if)#bandwidth 10000000
Router (config-if)#ip address 222.38.69.78 255.255.255.252
Router (config-if)#crc 16
Router (config-if)#pos framing sdh
Router (config-if)#no ip directed-broadcast
Router (config-if)#pos flag s1s0 2
Router (config-if)#no shutdown
Router (config-if)#exit
Router (config)#

答案D

解析 配置千兆以太网接口:
Router (config)#interface <接口名>
Router (config if)#description To <目的网络名>
Router (config if)#bandwidth 10000000(带宽10Gbps=10000000kbps)
Router (config if)#ip address
Router (config if)#crc 16(可选crc效验位时16和32)
Router (config if)#pos framing sdh(帧格式SDH/SONET)
Router (config if)#no ip directed broadcast
Router (config if)#pos flag s1s0 2(s1s0 2对应SDH,s1s0 0对应SONET)
Router (config if)#no shutdown
Router (config if)#exit
Router (config)#
由上述命令可知A项错误。C项中应是子网掩码而不是反掩码,所以C项错误。由于题中要求POS接口的帧格式是SDH,SDH对应S1S02,所以B项错。因此选项D正确。
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