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问题 填空题

我国三国时代著名数学家刘徽是第一个用割圆术找到计算圆周率方法的人，他求出π的近似值为3.1416，如果取3.142，是精确到（    ）位，有（    ）个有效数字．

答案

千分,4

单项选择题

以下哪个不属于diameter应用层消息（）

A.DPR/DPA

B.ASR/ASA

C.RAR/RAA

D.CCR/CCA
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填空题

某公司网络中DHCP服务器可动态分配IP地址范围为192.168.0.100～192.168.0.200，其中192.168.0.100保留给MAC地址是00-11-22-33-44-55的主机。网络中某客户机从该服务器获取IP地址的过程中，在客户机捕获的4条报文及对第4条报文的分析如下图所示。请分析其中的信息，补全内容。
编号 报文摘要
1DHCP:Request,Type:DHCP discover
2DHCP:Reply,Type:DHCP offer
3DHCP:Request,Type:DHCP Request
4DHCP:Reply,Type:DHCP ______
IP:Destination Address=______, Source Address=______
UDP:Destination Port=67,Source Port=68
DHCP:-----DHCP Header-----
DHCP:Boot record type =2(Reply)
DHCP:Hardware address type =1(10M Ethernet)
DHCP:Hardware address length =6 bytes
DHCP:Hops =0
DHCP:Transaction id =604D121F
DHCP:Elapsed boot time =1024 seconds
DHCP:Flags =0000
DHCP:0 =no broadcast
DHCP:Client self-assigned address =[0.0.0.0]
DHCP:Client address =______
DHCP:Next Server to use in bootstrap =[0.0.0.0]
DHCP:Relay Agent =______
DHCP:Client hardware address =001122334455
DHCP:Host name =""
DHCP:Boot file name =""
DHCP:Vendor Information tag =53825276
DHCP:Message Type =5
DHCP:Address renewel interval =345600 (seconds)
DHCP:Address rebinding interval =604800(seconds)
DHCP:Request IP Address leased time =691200(seconds)
DHCP:Server IP Address =192.168.0.1
DHCP:Subnet mask =255.255.255.0
……
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