220.220.220.0 is an invalid subnet mask.
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6-inch calipers
6-inch calipers
Without a subnet mask a client is not able to participate on a network because the network software is unable to determine the network addresses.
RIPv1 is classful and will use the proper network mask based on the leading octet. For example 192.168.20.0 would have a mask of 255.255.255.0 because it is a class C
subnet mask
JSGPM sizing tool....or a six inch caliper!
you can't. There's no way to know from an IP address wha the subnet mask is. However, there are some likely guesses. Since 195.0.8.0 ends with a zero, the subnet is probably a 24-bit mask: 255.255.255.0 But it doesnt have to be. The network administrator knows for sure. fm
binary ANDing
To determine the network or subnet address of an IP address
binary ANDing
A router running a classless routing protocol (Such as OSPF) will send the subnet mask in its route updates to its neighboring routers.