Readings: Network Segmentation

Reading

What is CIDR notation? a CIDR block?

In CIDR notation, an IP address is represented by a combination of the IP address itself and a slash ("/") followed by a number representing the network prefix length. The network prefix length indicates the number of bits that are used to define the network portion of the IP address.A CIDR block refers to a range of IP addresses that share the same network prefix.

How many octets are found in an IPv4 address?

4

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

0 to 255

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

The final digit after the "/" in an IPv4 address represents the network prefix length or subnet mask. It specifies the number of bits in the network portion of the IP address.

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

254

In your own words, describe network segmentation.

Basically dividing a computer into smaller parts.

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

No I don't agree because Network segmentation provides an additional layer of defense beyond the firewall. Even with a well-configured firewall, there is still a possibility of an attacker breaching the network perimeter.

What is a screened subnet?

a network architecture setup that provides an additional layer of security between an organization's internal network (trusted network) and the external network (untrusted network, typically the internet).

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

I'll say physical security.