This document provides an introduction to subnetting basics. It begins by covering prerequisite knowledge, including classful network addressing, subnet masks in dotted decimal and prefix length notation, and the default subnet masks for Classes A, B, and C. It then explains how to identify the subnet and host bits when given an IP address and prefix length. The document demonstrates how to calculate the number of subnets and hosts available by using binary math equations. It provides an example of analyzing an IP address of 192.168.32.158/28 to determine its subnet ID and host ID.
This presentation contains why we need sub netting, how we do sub netting, CIDR, Subnet mask, Subnet mask value, Class A Sub netting, Class B Sub netting, Class C Sub netting.
This study guide is intended to provide those pursuing the CCNA certification with a framework of what concepts need to be studied. This is not a comprehensive document containing all the secrets of the CCNP nor is it a “braindump” of questions and answers.
I sincerely hope that this document provides some assistance and clarity in your studies.
This presentation contains why we need sub netting, how we do sub netting, CIDR, Subnet mask, Subnet mask value, Class A Sub netting, Class B Sub netting, Class C Sub netting.
This study guide is intended to provide those pursuing the CCNA certification with a framework of what concepts need to be studied. This is not a comprehensive document containing all the secrets of the CCNP nor is it a “braindump” of questions and answers.
I sincerely hope that this document provides some assistance and clarity in your studies.
Network address translation (NAT) is a method of remapping one IP address space into another by modifying network address information in Internet Protocol (IP) datagram packet headers while they are in transit across a traffic routing device.
Subnet Calculation from a given IP range, using the classless Subnet mask. Calculating number of hosts in a subnet and number of subnets possible to create in a given IP range.
Complete understanding of subnet masking
also available on the youtube channal in three parts 1,2,3
link:-
https://www.youtube.com/channel/UC36lyOTi8w1EhQ-yZssjX1g?view_as=subscriber.
A
PROJECT REPORT
On
CISCO CERTIFIED NETWORK ASSOCIATE
A computer network, or simply a network, is a collection of computer and other hardware components interconnected by communication channels that allow sharing of resources and information. Where at least one process in one device is able to send/receive data to/from at least one process residing in a remote device, then the two devices are said to be in a network. Simply, more than one computer interconnected through a communication medium for information interchange is called a computer network.
Network address translation (NAT) is a method of remapping one IP address space into another by modifying network address information in Internet Protocol (IP) datagram packet headers while they are in transit across a traffic routing device.
Subnet Calculation from a given IP range, using the classless Subnet mask. Calculating number of hosts in a subnet and number of subnets possible to create in a given IP range.
Complete understanding of subnet masking
also available on the youtube channal in three parts 1,2,3
link:-
https://www.youtube.com/channel/UC36lyOTi8w1EhQ-yZssjX1g?view_as=subscriber.
A
PROJECT REPORT
On
CISCO CERTIFIED NETWORK ASSOCIATE
A computer network, or simply a network, is a collection of computer and other hardware components interconnected by communication channels that allow sharing of resources and information. Where at least one process in one device is able to send/receive data to/from at least one process residing in a remote device, then the two devices are said to be in a network. Simply, more than one computer interconnected through a communication medium for information interchange is called a computer network.
These presentations are created by Tushar B Kute to teach the subject 'Management Information System' subject of TEIT of University of Pune.
http://www.tusharkute.com
This study guide is intended to provide those pursuing the CCNA certification with a framework of what concepts need to be studied. This is not a comprehensive document containing all the secrets of the CCNA, nor is it a “braindump” of questions and answers.
I sincerely hope that this document provides some assistance and clarity in your studies.
IP Addressing and Subnetting
1. Write the default Masks for the Class A, Class B and Class C IP addresses.
2. How we can distinguish Class A, Class B, Class C, Class D and Class E IP addresses from each other. Write the range of first octet in decimal and Binary for all the 5 IP address classes.
3. Write the default subnet Masks for the following IP addresses:
4. Write down the three available ranges for assigning Private IP addresses recommended by IANA (Internet Assigned Number Authority).
5. A broadcast address is the one that addresses to all the hosts in any network. State that to create a broadcast address, all the bits of network ID portion or all the bits of host ID portion are set to 1? Write down the broadcast addresses of the networks to which the following IP addresses belong, write network addresses and ranges of their valid IP address too. (No subnetting).
6. Subnet Mask or Custom mask tells us that how many bits are used for Subnet ID portion and how many for host ID portion. Identify how many bits are used for sub netting in the following IP address using its subnet mask:
7. Extract the Network Addresses of the given IP addresses in question number 8, using the subnet masks given with them. (Remember that ANDing the IP address with the Mask extracts the network address from the given IP address).
8. Suppose you have a class C Network 208.94.115.0. Your task is to design a subnet scheme so that we can create 16 Network segments (subnets) within this Network. Each subnet should support 10-14 hosts.
9. Suppose you have a class C Network 220.94.115.0. Your task is to design a subnet scheme so that we can create 28 Network segments (subnets) within this Network. Each subnet should support hosts as given below.
• 2 Network Segment support 30 Hosts
• 4 Network Segment support 14 Hosts
• 8 Network Segment support 6 Hosts
• 14 Network Segment support 2 Hosts
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
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4. Subnetting Basics
Prerequisite Knowledge
Class 1st Octet Valid Network Total Number of
Range Numbers Networks hosts per
for this network
class
1 -126 1.0.0.0 to 126 224 – 2
A
126.0.0.0 16,777,214
N.H.H.H
128 – 191 128.0.0.0 to 16,384 216 – 2
B
191.255.0.0 65,534
N.N.H.H
192 – 223 192.0.0.0 - 2,097,152 28 – 2
C
223.255.255.0 254
N.N.N.H
N = network octet H = host octet 4
5. Subnetting Basics
Prerequisite Knowledge
Definitions
Network ID : all host bits are set to 0
192.168.32.0000 0000
Ex : 192.168.32.0 /24
Broadcast ID : all host bits are set to 1
192.168.32.1111 1111
Ex : 192.168.32.255 /24
IP Address : any value in between
192.168.32.0000 0001 – 1111 1110
Ex : 192.168.32.1 - .254 /24
5
6. Subnetting Basics
Prerequisite Knowledge
Prefix Length Notation
There are 2 ways to express a subnet mask:
Dotted Decimal Notation: Prefix Length Notation:
Class C mask: 255.255.255.0 Class C mask: /24
255.255.255.0 = 1111 1111. 1111 1111. 1111 1111. 0000 0000
Notice that there are 24 blue (network) bits. The PL number (/24)
indicates how many bits are being used to represent the network ID.
Notice how the host bits are always 0 in a subnet mask
6
7. Subnetting Basics
Prerequisite Knowledge
The default Class A, B, & C subnet masks
Class A default subnet mask : 255.0.0.0 ( /8 )
Binary: 1111 1111.0000 0000.0000 0000.0000 0000
Class B default subnet mask : 255.255.0.0 ( /16 )
Binary: 1111 1111.1111 1111.0000 0000.0000 0000
Class C default subnet mask : 255.255.255.0 ( /24 )
Binary: 1111 1111.1111 1111.1111 1111.0000 0000
7
8. Subnetting Basics
Prerequisite Knowledge
Binary Number System
1 BYTE = 8 BITS : 1010 0001
Each bit position has an associated PLACE VALUE as indicated :
27 26 25 24 23 22 21 20
1 0 1 0 0 0 0 1
128 + 32 + 1 = 16110
Add up the place values wherever you have a “1” bit
This is how you convert from binary to decimal 8
10. Subnetting Basics
Identifying Subnet Bits in a Class C IP Address
Example (unsubnetted or classful): 192.168.32.158 /24
Example (subnetted or classless): 192.168.32.158 /28
Step 1: Notice that the prefix length (PL) indicator of the
subnetted example is /28. This number is greater than the
default PL indicator of /24. This tells you that the IP address is
subnetted.
10
11. Subnetting Basics
Identifying Subnet Bits in a Class C IP Address
Example: 192.168.32. 158 /28
15810 = 1001 11102
Step 2: Examine the host octet by converting it to a binary
number.
11
12. Subnetting Basics
Identifying Subnet Bits in a Class C IP Address
Example: 192.168.32.158 /28 15810 = 1001 11102
Step 3a Subnet Bits Rule: Subnet bits are “assigned” starting
with the high order bits in the host octet.
Step 3b: Subtract the default class C PL indicator from the
current PL indicator to get the number of bits to “assign”.
/28 - /24 = 4 bits must be “borrowed” for use as subnet bits.
12
13. Subnetting Basics
Identifying Subnet Bits in a Class C IP Address
Example: 192.168.32.158 /28 15810 = 1001 11102
Step 4: 4 Subnet bits are “borrowed” starting with the high
order bits in the host octet. Color code these bits in blue using
an italicized font and color code the remaining host bits in red:
15810 = 1001 11102
13
15. Subnetting Basics
Calculating The Number of Subnets
Example: 192.168.32.158 /28
15810 = 1001 11102
Procedure: Use the equation 2X where X = the number of
subnet bits. There are four subnet (i.e. blue, italicized ) bits.
Therefore: 24 = 16, so there are 16 subnets available.
15
16. Subnetting Basics
Calculating The Number of Subnets
Example: 192.168.32.158 /28 15810 = 1001 11102
The 16 subnets are indicated by all possible combinations of the four subnet
bits. Note that the subnet ID numbers are shown in parentheses next to the
binary.
0000 (ID 0) 1000 (ID 128)
0001 (ID 16) 1001 (ID 144)
0010 (ID 32) 1010 (ID 160)
0011 (ID 48) 1011 (ID 176)
0100 (ID 64) 1100 (ID 192)
0101 (ID 80) 1101 (ID 208)
0110 (ID 96) 1110 (ID 224)
0111 (ID 112) 1111 (ID 240)
16
17. Subnetting Basics
Calculating The Number of Subnets
Example: 192.168.32.158 /28 15810 = 1001 11102
The subnet ID numbers shown in parentheses in the previous
slide are the result of binary to decimal conversion using the
method as demonstrated in slide 8. The binary place values are
repeated below for your convenience:
27 = 128 26 = 64 25 = 32 24 = 16 23 = 8 22 = 4 21 = 2 20 = 1
17
19. Subnetting Basics
Calculating The Number of Hosts
Example: 192.168.32.158 /28
15810 = 1001 11102
Procedure: Use the equation 2X - 2 where X = the number of
host bits. There are four host (i.e. red) bits.
Therefore: 24 – 2 = 14, so there are 14 hosts available.
19
20. Subnetting Basics
Calculating The Number of Hosts
Example: 192.168.32.158 /28 15810 = 1001 11102
The host ID numbers are given by all possible combinations of
the four host bits:
0000 (ID 0) 1000 (ID 8)
0001 (ID 1) 1001 (ID 9)
0010 (ID 2) 1010 (ID 10)
0011 (ID 3) 1011 (ID 11)
0100 (ID 4) 1100 (ID 12)
0101 (ID 5) 1101 (ID 13)
0110 (ID 6) 1110 (ID 14)
20
0111 (ID 7) 1111 (ID 15)
21. Subnetting Basics
Calculating The Number of Hosts
Example: 192.168.32.158 /28 15810 = 1001 11102
Why are the first and last hosts grayed out?
Hint: See slide 5.
0000 (ID 0) 1000 (ID 8)
0001 (ID 1) 1001 (ID 9)
0010 (ID 2) 1010 (ID 10)
0011 (ID 3) 1011 (ID 11)
0100 (ID 4) 1100 (ID 12)
0101 (ID 5) 1101 (ID 13)
0110 (ID 6) 1110 (ID 14)
21
0111 (ID 7) 1111 (ID 15)
22. Subnetting Basics
Putting It All Together
Example: 192.168.32.158 /28
15810 = 1001 11102
144 14
The host octet in this class C private IP address
identifies subnet ID #144, which contains host #14.
22
23. Subnetting Basics
Be sure to watch the complete Subnetting Basics
presentation found in the Course Documents
section of your Bb course shell.
23