OPS 301 Class 03 - MackD51/CyberReadingNotes GitHub Wiki
CIDR Block Notation & What is Network Segmentation
CIDR Block Notation
What is CIDR notation? A CIDR block?
CIDR notation is a method for expressing IP addresses and their associated network prefixes, where the prefix length indicates the number of significant bits in the network. A CIDR block refers to a range of IP addresses within a network that shares the same prefix length.
How many octets are found in an IPv4 address?
An IPv4 address consists of four octets. Each octet is a group of 8 bits, with a total of 32 bits for the entire IPv4 address.
Setting binary aside and using the decimal system, what is the range of numbers found in an octet?
0-255
What does the final digit after the โ/โ represent in an IPv4 address?
The final digit represents how many bits make up the mask
How many IP addresses are in the CIDR block 10.0.0.0/24?
256, although two of the IPs are usually reserved.
What Is Network Segmentation and Why It Matters?
In your own words, describe network segmentation.
Network segmentation is a method of dividing a network to enhance security, help manage network traffic, as well as manage who has access to what information on a network.
Network segmentation isnโt important as long as the network is using a well-configured firewall. Do you agree? Why or why not?
I do not agree as a well-configured firewall is a crucial piece to a network, segmenting the network at minimum adds an additional layer of security, and makes an attack easier to manage in the sense that it won't get access to the entire network.
What is a screened subnet?
A screened subnet is a network segment that acts as a buffer between the Internet and the internal network.
Cameras, ID card scanners, locked doors, and biometrics are just a few examples of what type of security?
These are all examples of physical security, that are used to protect, deter, and manage access to an array of assets.