综合题 4.  某客户机使用DHCP获取IP地址等信息,其获取IP地址过程中捕获的4条报文及对第2条报文分析如下图所示。请分析图中的信息,补全图中横线处的内容。
编号  报文摘要
 1  DHCP: Request, Type: DHCP discover
 2  DHCP: Reply, Type: DHCP ______
 3  DHCP: Request, Type: DHCP Request
 4  DHCP: Reply, Type: DHCP ACK
DLC: -----DLC Header-----
  DLC: Destination
  DLC: Source
  DLC: Ethertype
=______
=001122334455
=0800 (IP)
IP: D = ______, S = 192.168.0.1
______: D = 68, S = 67
DHCP: -----DHCP Header-----
  DHCP: Boot record type
  DHCP: Hardware address type
  DHCP: Hardware address length
  DHCP: Hops
  DHCP: Transaction id
  DHCP: Elapsed boot time
  DHCP: Flags
  DHCP: 0
  DHCP: Client self-assigned address
  DHCP: Client address
  DHCP: Next Server to use in bootstrap
  DHCP: Relay Agent
  DHCP: Client hardware address
  DHCP: Host name
  DHCP: Boot file name
  DHCP: Vendor Information tag
  DHCP: Message Type
  DHCP: Address renewel interval
  DHCP: Address rebinding interval
  DHCP: Request IP Address leased time
  DHCP: Sever IP Address
  DHCP: Subnet mask
  DHCP: Gateway address
  DHCP: Domain Name Server address
=2 (Reply)
=1 (10M Ethernet)
=6 bytes
=0
=6019121F
=0 seconds
=0000
=no broadcast
=[0.0.0.0]
=[192.168.0.180]
=[0.0.0.0]
= [0.0.0.0]
=001234567890
=" "
=" "
=53825276
=2
=345600 (seconds)
=604800 (seconds)
=691200 (seconds)
=______
=255.255.255.0
=[192.168.0.100]
=[202.106.0.100]
在DHCP客户机上捕获的报文及第2条报文的分析
【正确答案】offer
   ffffffffffff
   255.255.255.255
   UDP
   192.168.0.1
【答案解析】