eco100 Lecture Notes - Lecture 5: Classless Inter-Domain Routing
3 Dec 2015
School
Department
Course
Professor
Document Summary
Both recursively divide networks into small sub networks. The recursion is performed on the address space previously assigned to an organization and is invisible to the global internet. Cidr permits the recursive allocation of an address blocked by an. Internet registry to a high-level isp, to a mid level to a lower level. Isp and finally to a private organization"s network. To support 26 hosts on a subnet, a minimum of 5 bits is needed in the host portion of the address. 5 bits result in 30 possible host addresses (2^5-2). The other 3 bits in the last octet can be added to the default 24-bit class c mask. Thus, a 27-bit mask can be used to create the following subnets:- To maximize the address space, the 192. 168. 150. 0 /27 subnet is further subnetted using a. Since this is the only network address available it cannot be supernetted.
