Hello Radhika,
Concept:
0.0.0.0 Means Any IP
255.255.255.255 Means Match All
x.x.x.x Means forward to the Destination Adr.
Example:
IP 0.0.0.0.bootpc > 255.255.255.255.bootps: BOOTP/DHCP, Request from 00:04:23:57:a5:7a
Explanation:
The above IP Route Command you mentioned will be used for this type BOOTP / DHCP Requests. Because, Basically systems getting their IP Address assigned during BOOTP & via DHCP will request using their MAC Address Only.
At this Case, their initial IP will be 0.0.0.0 & it need to be matched fully(255) since it may be BOOTP / DHCP & then request is fwd to the DHCP Server(x) where their MAC Address will be matched against "Mac-address-table" & IP will be released based on the Availaibility & Lease Condictions.
Hope this Helps you!!
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Thanks & Regards,
Guru Prasad R