A classless routing protocol can route between subnets
OSPF is a classless link-state routing protocol. RIP version 1 and IGRP are both classful distance vector routing protocols, EIGRP is a hybrid protocol that supports classless addressing.
A router running a classless routing protocol (Such as OSPF) will send the subnet mask in its route updates to its neighboring routers.
Rip V1 is Classful routing protocol Rip V2 is Classless routing Protocol
A routing protocol is a formula that specifies how routers are communicating to each others. Types of routing protocols include Interior Gateway Protocol, Distance vector protocol and Classful or classless protocol. Routing protocols are required to determine the appropriate paths for data transmission.
variable length subnet masks
Classless protocols send a subnet mask with each route advertisement
RIPv2 sends subnetmasks in the routing table updates. RIPv1 does not, which causes it be class-full.
it is a cisco propriatary routing protocol.
Classful.
if a protocol is only classfull(RIPv1, IGRP) the command will have no effect, but in protocols that support vlsm and classless ip adressing it will enable the protocol to send the subnet mask in it's packets so that a router would not recognize only class networks, but also their subnets.
RIP V1 dose not support CIDR or VLSM as it a clasfull routing protocol that dose not include the subnet mask.. however if you were to use RIPV2 you could use static routing with it as it is a classless protocol and dose incoperate the subset mask in the update
rip version 1 is classfull routing protocol. in classfull routing protocol is not able to carry its subnet mask whatever the ip belong from a class. it wil take its by default subnet mask.if the ip address belong to class b and the subnet mask is published as /28. in classless routing protocol this ip address would be displayed as /16 not like /28