In this slide on what is subnetting we will learn how to efficiently manage excess IP addresses in a network channel and use them by using the subnetting process. You will also learn about the seven essential attributes required for the subnetting process and solve an example to practice subnetting, and also see some benefits and drawbacks of using the subnetting process. Topics covered in this presentation on what is subnetting are: 1. What Is Subnetting? 2. Class Addresses & Subnet Mask 3. Characteristics Of Subnetting 4. Benefits Of Subnetting 5. Drawbacks Of Subnetting Subnetting Explained Subnetting is the process of dividing a large IP address into smaller network address in the network block. This allows the network model to have better conectivity and becomes more efficient in transmission of data and information within the netowork. The subnetting process involves the use of seven attributes which are required for the subnetting process. What Is Cyber Security? Cyber Security involves techniques that help in securing various digital components, networks, data, and computer systems, from unauthorized digital access. There are several ways to implement cybersecurity, depending on the kind of network you are connected to and the type of cyberattacks you are prone to. A few ways to implement cybersecurity are defining clear boundaries, using network security control devices like Firewalls and IDS. About Advanced Executive Program in Cybersecurity: Become an industry-ready professional with Advanced Executive Program in Cybersecurity and transform your career in 6 months. This course provides a high-engagement learning experience with real-world applications and is designed for individuals who want to start a new, more fulfilling career. This Advanced Executive Program in Cybersecurity will help you develop expertise in defensive cybersecurity, application security, malware analysis, ethical hacking, and much more. In partnership with IIIT Bangalore and NPCI, this program provides you with a deep understanding needed to spot the opportunities for disruption in the cybersecurity industry. Learn more at: https://www.simplilearn.com/pgp-advanced-executive-program-in-cyber-security

2.  What Is Subnetting?
 Class Addresses & Subnet Mask
 Characteristics Of Subnetting
 Benefits Of Subnetting
 Drawbacks Of Subnetting
What’s In It For You?

3. What Is subnetting?

4. Click here to watch the video

5. What Is Subnetting?
Subnetting involves the process of dividing a network into smaller networks to attain better
connectivity, security, and efficient flow of network traffic.
The smaller divided networks are known as sub-networks.
Connectivity Net Traffic
Security
11.12.35.0/24
11.12.35.X/25
11.12.35.X/25
Sub-Network
Sub-Network
Sub-Network

6. Class Address & Subnet Mask

7. Class Addresses
Class Octet Range Network Bits
A 0XXXXXXX 0-127 /8
B 10XXXXXX 128-191 /16
C 110XXXXX 192-223 /24

8. Class Addresses
Class Octet Range Network Bits
A 0XXXXXXX 0-127 /8
B 10XXXXXX 128-191 /16
C 110XXXXX 192-223 /24
Class A - 1 1 1 1 1 1 1 1 | 00000000 | 00000000 | 00000000
Class B - 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 00000000 | 00000000
Class C - 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 00000000
8
16
24

9. Subnet Mask
Class Range Network Bits Subnet Mask
A 0-127 /8 255.0.0.0
B 128-191 /16 255.255.0.0
C 192-223 /24 255.255.255.0
Class A - 1 1 1 1 1 1 1 1 | 00000000 | 00000000 | 00000000
Class B - 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 00000000 | 00000000
Class C - 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 00000000
8
16
24
Network ID Host ID
The subnet mask is a way to differentiate between the
network ID and the host ID part of an IP address.

10. Subnet Mask
Class Range Network Bits Subnet Mask
A 0-127 /8 255.0.0.0
B 128-191 /16 255.255.0.0
C 192-223 /24 255.255.255.0
Class A - 1 1 1 1 1 1 1 1 | 00000000 | 00000000 | 00000000
Class B - 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 00000000 | 00000000
Class C - 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 1 1 1 1 1 1 1 1 | 00000000
8
16
24
Network ID Host ID

11. Characteristics Of Subnetting

12. Characteristics Of Subnetting
The Seven characteristics of Subnetting:
 Network ID: This is the first IP address in each Sub-Network.
 Broadcast ID: This is the last IP address in each Sub-Network.
 First Host ID: Represents the IP address after the Network ID.
 Last Host ID: Represents the IP address before the Broadcast ID.
 Next Network: This defines the network ID of the next sub-network.
 # IP Addresses: The total no. of IP addresses in the Sub-Network.
 Subnet/CIDR: Is the way to differentiate b/w the Network ID and the Host ID in an IP address.

13. Characteristics Of Subnetting
 Assuming an example IP address: 192.168.0.X/24,
/25
/27
/27
/26
.0
.255
.128
.160
.192
 # IP Addresses
 Subnet/CIDR
 Network ID
 Broadcast ID
 First Host IP
 Last Host IP
 Next Network
IP: 128
CIDR: 255.255.255.128
Net ID: 192.168.0.0
Brd ID: 192.168.0.127
IstH IP: 192.168.0.1
LstH IP: 192.168.0.126
Next Network: 192.168.0.128
Characteristics?
The Network ID is used to identify the sub-network block.
The Broadcast ID is used to communicate with any of the host attached to the sub-network.
Total no. of usable addresses = Total no. of addresses – 2(Network ID and Broadcast ID)
Usable = 128-2
Usable = 126 IP addresses

14. Benefits Of Subnetting

15. Benefits Of Subnetting
Enhanced Network Efficiently: When the system transmits a packet on the network, it is transferred to
only those network devices, that are, connected to that specific subnet network after transmitting
through the router.
12.1.3.x
12.1.2.2
12.1.2.1
12.1.1.2
12.1.1.1
12.1.1.X 12.1.2.X

16. Benefits Of Subnetting
Network Security: In case of a hacking attack, if the network is sub-netted then the damage to
the network can be controlled to a specific sub-network.
12.1.3.x
12.1.2.2
12.1.2.1
12.1.1.2
12.1.1.1

17. Drawbacks Of Subnetting

18. Drawbacks Of Subnetting
Establishing multiple subnets may make the network system too complex and decrease the
effectiveness of the subnetting.
Wastage of unrequired IP addresses after assigning the needed networks.
Proper requirement of network devices, such as router, switch, etc.

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