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条报文分析如下所示。请分析其中的信息，补全内容。
编号 报文摘要
1 DHCP:Request, Type:DHCP discover
2 DHCP:Reply, Type:DHCP 【51】.
3 DHCP:Request, Type:DHCP Request
4 DHCP:Reply, Type:DHCP ACK
DLC: ----- DLC Header -----
DLC: Destination = 【52】.
DLC: Source = 001122334455
DLC: Ethertype = 0800 (IP)
IP: D = 【53】 ,S = 192.168.0.1
【54】: D = 68,S = 67
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 = 6019121F
DHCP: Elapsed boot time = 0 seconds
DHCP: Flags = 0000
DHCP: 0 = no broadcast
DHCP: Client self-assigned address = [0.0.0.0]
DHCP: Client address =[192.168.0.180]
DHCP: Next Server to use in bootstrap = [0.0.0.0]
DHCP: Relay Agent = [0.0.0.0]
DHCP: Client hardware address = 001234567890
DHCP: Host name = “”
DHCP: Boot file name = “”
DHCP: Vendor Information tag = 53825276
DHCP: Message Type = 2
DHCP: Address renewel interval = 345600 (seconds)
DHCP: Address rebinding interval = 604800 (seconds)
DHCP: Request IP Address leased time = 691200 (seconds)
DHCP: Sever IP Address = 【55】.
DHCP: Subnet mask = 255.255.255.0
DHCP: Gateway address = [192.168.0.100]
DHCP: Domain Name Server address = [202.106.0.100]
第【51】题:对照DHCP工作原理可知，第2条报文是DHCP服务器广播DHCP offer作为对DHCP discover报文的响应。
所以第【51】应填：offer。
第【52】题:第2条报文是DHCP服务器广播的DHCP offer消息，源地址为地址，目的地址为广播地址，源MAC地址为DHCP服务器MAC地址001122334455，目的MAC地址为广播MAC地址ffffffffffff。
即第【52】应填：ffffffffffff
第【53】题:第2条报文是DHCP服务器广播的DHCP offer消息，源IP地址为DHCP服务器地址192.168.0.1；目的IP地址为广播地址255.255.255.255。
所以第【53】应填：255.255.255.255。
第【54】题:DHCP工作过程中消息传输使用UDP协议，目的端口号为68，源端口号为67。
所以第【54】应填：UDP。
第【55】题:第2条报文是DHCP服务器广播的DHCP offer消息，源IP地址为DHCP服务器IP地址。
所以第【55】应填：192.168.0.1。