某公司使用Windows 2003 DHCP服务器对内部主机的IP地址进行管理，DHCP服务器的新律作用域及新建保留配置如图2和图3所示。
某DHCP客户机从该DHCP服务器获取IP地址过程中，在客户机捕获的报文及相关分析如图4所示。请补充图4中 (11) 到 (15) 的信息。
DHCP:——DHCP Header——
DHCP: Boot record type=2 (Reply)
DHCP: Hardware address type=1(lOM Ethernet)
DHCP: Hardware address length=6 bytes
DHCP: Hops=0
DHCP: Transaction id=2219231D
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= (14)
DHCP: Next Server to use in bootstrap=[0.0.0.0]
DHCP: Relay Agent=[0.0.0.0]
DHCP: Client hardware address=001122334455
DHCP: Message Type=5 (DHCPAck)
DHCP: Address renewel interval=345600 (seconds)
DHCP: Address rebinding interval=604800 (seconds)
DHCP: Request IP Address lease time=691200 (seconds)
DHCP: Subnet mask= (15)
图4在DHCP客户机上捕获的报文及第4条报文的分析
(11)
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答 案：255.255.255.255
255.255.255.255