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Reading CIDR Block Notation Explained in 2 Minutes

What is CIDR notation? a CIDR block?

It is a group using the same network. FOr examplet 192.168.1.0/24 has 255 different addresses you can use. That 255 employees. A CIDR Block is those 255

How many octets are found in an IPv4 address?

4 where each period lands is a new octet 192. one octet 168. second 1. 3rd .0/24 is the 4th

Setting binary aside and using the decimal system, what is the range of numbers found in an octet?

255 is the highest and octet can go. The octet has 8 places. 128 + 64 + 32 + 16 + 8 + 4 + 2 + 1. If you add those up, it comes out to 255.
The way you get the number like 192, is by adding all the 8-digit place holder numbers together. So 192-(128 + 64 + 0 + 0 + 0 + 0 + 0 + 0).168-(128 + 0 + 32 + 0 + 8 + 0 + 0).1-(0 + 0 + 0 + 0 + 0 + 0 + 0 + 1).0-(0 + 0 + 0 + 0 + 0 + 0 + 0 + 0)

What does the final digit after the “/” represent in an IPv4 address?

192.168.1.0/24 represents the amount of bits that make up the group or mask. So 24 bits is a total of 255 different outcomes.

How many IP addresses are in the CIDR block 10.0.0.0/24?

255- 24 means 2⁸. the larger the number the smaller the amount of masks

What Is Network Segmentation and Why It Matters?

Network segmentation is where you section off and departmentalize groups in the same network by using firewalls and routers. The reason this is better is because internet can lag if everyone is on the same network, so compartmentalizing for examples every 50 employees will improve performance of their workstations, and also, you'll be able to provide certain tailored experiences for different departments, like marketing can have their own network, and billing can have a more secure set-up for example

In your own words, describe network segmentation.

Network segmentation takes an entire group or company, and adds routers and sections off this big lump of people into smaller sections like a house has a bunch of rooms, not just one big room

Network segmentation isn’t important as long as the network is using a well configured firewall. Do you agree? Why or why not?

NO, because even if it is secure, it will not run as well due to a limited amount of people on 1 network before you start to see a decrease in performance

What is a screened subnet?

It is a sectioned off group where the public can access that network, but cannot enter other parts of the whole big network every other department is in

Cameras, ID card scanners, locked doors and biometrics are just a few examples of what type of security?

Authorization Videos Classful Subnetting

VLANs and Trunking