Understanding IP Address Subnetting: The Basics

When subnetting, subnet number can't be all zeros or all ones, right? Like, you know, like old RFC-95 said, subnetting can't be all zeros or ones, or routers will be like, "What hell is this?" But, you know, now routers are like, "Oh, it's okay, I can handle it." So, some books don't even stress it anymore.

Full zeros, full ones, yeah, that's no good for host part. Like, take 10.0.0.0/8, network part is 10, and host part is zeros at end. Binary, it's like 00000000.00000000.00000000. That's no good, that's like, "This is for telling outside world about this segment." And you can't use all ones, like 11111111.11111111.11111111, which is 255.255.255 in decimal, with 10 in front.

IP Address Structure: Network and Host Parts

IP addresses, y got two parts, network part and host part. The zeros and ones, y are host part, right? If y are all zeros, it's like, "This is where my network is at." If y are all ones, it's like, "This is where everyone gets to hear my message, because it's a broadcast address." So, you can't just give that to any old device.

Class C IP Address Division: An Example

Let's say you have a Class C IP address, like 192.168.10.0, and you want to split it into 8 segments, with 32 hosts in each segment. You do it like this: subnet mask, 255.255.255.224, and subnet is 192.168.10.0, and broadcast address is 192.168.10.31. Then, you just keep moving subnet mask, and you get your segments.

Subnet Mask: Broadcasting and Identifying Network

The subnet mask, it's like one with all ones, used for broadcasting. It's like, "Hey, everyone in this network, listen up!" And one with all zeros, it's like, "This is network itself, not for any device to use." When all bits are ones, it's a broadcast address, and when all bits are zeros, it's network address.，我开心到飞起。

Special IP Addresses: Network 127 and Broadcast Address

翻旧账。 There's this network number 127, and we don't use it, because we use it as a loopback address. It's like, "This is for testing, to see if my network is working." And broadcast address, it's all ones, but it's not for sending data to any device, just for broadcasting.

Using IP Addresses as 0 or 1: Risks and Uses

Using IP addresses as 0 or 1 can be risky, but if you plan it right, you can use m effectively. The 0.0.0.0 is for network, not for a single host. If you use it, routers and switches might be like, "Wait, is this a network or a host?" And 255.255.255.255 is for broadcasting, but if you use it as a host, everyone will get message, and that's not good.

Scenarios for Using IP Addresses as 0 or 1

For 0.0.0.0, you can use it to represent network. For 255.255.255.255, you can use it for broadcasting. But, you got to be careful, and control access, or else hackers might use it to attack your network.，绝了...

Conclusion: Network Planning for Safety

IP addresses as 0 or 1, y can be risky, but with proper planning and control, you can use m safely. It takes some knowledge and experience to do it right, but it's worth it for network security.