三级网络技术

考试试题

[问答题]如下表所示,在某DHCP客户机执行ipconfig /release和ipconfig /renew命令时捕获了5条报文,表中列出报文的部分信息并对第3条报文进行了解析。若执行命令前后客户机的IP地址没有改变,分析表中的信息并补全空白处的信息。编号 源IP地址 目的IP地址 报文摘要1 {blank}           {blank}      DHCP:Request, Type:DHCP release2  ---           {blank}      DHCP:Request,Type:DHCP discover3 10.1.2.1    ---        DHCP:Reply, Type:DHCP{blank}4 {blank}            ---        DHCP:Request,Type:DHCP request5  ---            ---        DHCP:Reply,Type:DHCP ackDHCP:----- DHCP Header -----DHCP: Boot record type          = 2 (Reply)DHCP: Hardware address type    = 1 (10M Ethernet)DHCP: Hardware address length  = 6 bytesDHCP: Hops                      = 0DHCP: Transaction id             = 2619135DDHCP: Elapsed boot time         = 0 secondsDHCP: Flags                      = 0000DHCP: 0                          = nobroadcastDHCP: Client self-assigned address       = [0.0.0.0]DHCP: Client address                     = [10.1.2.3]DHCP: Next Server to use  in bootstrap  = [10.1.2.1]DHCP: Relay Agent                       = [0.0.0.0]DHCP: Client hardware address           = 001122334455DHCP: Vendor Information tag  = 63825363                ... ...