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【判断题】
DWDM系统使用的光源具有两个突出的特点是:比较高的色散容限和标准而稳定的波长。
A. 对
B. 错
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E1接口共32时隙,每时隙速率为64Kbps,64Kbps*32=2,048,000bps,故E1口又称为2M口。
A. 对
B. 错
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EPON系统在分光比为1:32下平均每个ONU分配到约30Mbps,带宽是不可调
A. 对
B. 错
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EPON与GPON的分光器可以通用
A. 对
B. 错
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F820的主控板是MS8E,可支持8个以太网端口;F821的主控板为MSVE,可支持8个以太端口中。
A. 对
B. 错
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F820最多可提供24*FE口或8FE口,32voip口
A. 对
B. 错
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ftp默认的端口号是20、21。
A. 对
B. 错
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FTP是基于UDP的,而TFTP是基于TCP的。
A. 对
B. 错
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FTTB类型ONU在修改数图匹配方式是通过修改控制点的方式来做的,即修改49号控制点,如:将匹配方式调整为最小匹配,就需要将该控制点的值调整为0。
A. 对
B. 错
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G.652光纤指在1310nm波长窗口的色散性能最佳,又称之为色散未移位的光纤(也就是0色散窗口在1310nm波长处),它可以应用于1310nm和1550nm两个波长区;()
A. 对
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GFM-2000铅蓄电池产品型号中G代表固定型、F代表防酸隔爆式、M代表密伐式,2000代表额定容量2000AH。
A. 对
B. 错
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GPON OLT每PON口可支持1:64的分光
A. 对
B. 错
【判断题】
GPON ONU的PON口上采用的尾纤类型为SC/APC。
A. 对
B. 错
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GPON 网络中的下行速率2.5Gbps表示整台OLT有2.5G的下行带宽。
A. 对
B. 错
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GPON的下行业务转发采用TDMA机制。
A. 对
B. 错
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GPON技术中,一个gem可以绑定到一个Tcont中,一个Tcont可以绑定多个gemport。
A. 对
B. 错
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GPON接入方式,采用IMS+OLT+GPON ONU方式,与传统通信方式不同,GPON接入以传统模拟线将用户语音通信接入到移动IMS核心网,同时为用户提供IMS业务。
A. 对
B. 错
【判断题】
GPON接入网丢包率是指从OLT上联设备至ONU设备的PING包丢包率。
A. 对
B. 错
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GPON系统的两种DBA带宽分配方式SR和NSR的区别主要取决于ONU支不支持带宽上报。如果支持,则默认就会使用SR,反之就是NSR。
A. 对
B. 错
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GPON最大分光比为1:64,采用两级分光,分光比分别为1:16和1:8。
A. 对
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HG850a属于FTTB类型的ONU
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ICMP协议可以把公网的IP地址转换为私网的IP地址
A. 对
B. 错
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Internet中的一台主机只能有一个IP地址。
A. 对
B. 错
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IPv4报头的最小长度为20字节,那么IPv6报头的长度为40。
A. 对
B. 错
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IPv6包头比IPv4包头更长,格式比IPv4复杂
A. 对
B. 错
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IPv6采用128位长度的地址格式,2000::1是一个非法的IPv6地址
A. 对
B. 错
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IPv6地址长度是IPv4的4倍,采用8段十进制数表示,中间使用冒号隔开
A. 对
B. 错
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IPV6是下一版本的互联网协议,采用32位地址长度,可不受限制提供地址
A. 对
B. 错
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A. 对
B. 错
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IP报文的报文头最少有20个字节。
A. 对
B. 错
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IP报文每经过一个网络设备,包括Hub、Lan Switch和路由器,TTL值都会被减去一定的数值
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A. 对
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A. 对
B. 错
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A. 对
B. 错
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A. 对
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( ) 30. Why did the father not ask his son not to do this and do that?    A.Because he felt quite confident of his son.    B.Because he was born from a poor family.    C.Because he was a man of few words.    D.Because he didn't want to be much too strict with his son.
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( ) 31. What would someone learn from this passage?    A.How to live by oneself. B.How to stand on one's own feet.    C.What a good father should do. D.What the self-important is like.
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( ) 32. What may be the proper Chinese for the underlined part in the passage?    A.闲暇时光 B.学费 C.精神空虚 D.经济不足
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( ) 33. Why did Natalie Smith pay for the six cars behind her? A. She had seven tickets. B. She hoped to please others. C. She knew the car drivers well. D. She wanted to show kindness.
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( ) 34. Judy Foreman copied down the phrase because she ___ . A. thought it was beautifully written B. wanted to know what it really meant C. decided to write it on a warehouse wall D. wanted her husband to put it up in the classroom
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【单选题】
( ) 35. Who came up with the phrase according to the passage? A. Judy Foreman. B. Natalie Smith. C. Anne Herbert D. Alice Johnson.
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( ) 36. What can we infer from the last paragraph? A. People should practice random kindness to those in need. B. People who receive kindness are likely to offer it to others. C. People should practice random kindness to strangers they meet. D. People who receive kindness are likely to pay it back to the giver.
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( ) 37.The greatest river for navigation is ___________. A. the Nile B. the Amazon C. the Mekong D. the Mississippi
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( ) 38. From a dam, people can use the water for ___________. A. keeping the rivers clean B. only making electricity C. irrigation and making electricity D. washing clothes
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( ) 39. The water in the river is polluted because of _____________. A. people's drinking water too much B. people's swimming in the river too much C. chemicals and other materials D. people's building a dam across a river
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