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Class B

The document discusses subnetting and IP addressing. It provides a table showing common subnet masks like /24, /25, /26 etc and the corresponding number of subnets and hosts each allows. It then gives an example of how to calculate subnets, hosts, valid IP ranges and broadcasts for the 255.255.192.0 subnet mask. Finally, it shows some sample subnet allocation tables for different departments in a school network.

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Cristina Nepotu
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49 views4 pages

Class B

The document discusses subnetting and IP addressing. It provides a table showing common subnet masks like /24, /25, /26 etc and the corresponding number of subnets and hosts each allows. It then gives an example of how to calculate subnets, hosts, valid IP ranges and broadcasts for the 255.255.192.0 subnet mask. Finally, it shows some sample subnet allocation tables for different departments in a school network.

Uploaded by

Cristina Nepotu
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Subnet 1 2 4 8 16 32 64

Host 256 128 64 32 16 8 4


Subnet Mask /24 /25 /26 /27 /28 /29 /30

Network 1 2 4 8 16 1 64 32 16
Host 256 128 64 32 16 8 4
rd
3 octet 4th octet

Subnet 1 2 4 8 16 32 64
Host 256 128 64 32 16 8 4
Subnet Mask /24 /25 /26 /27 /28 /29 /30

Example 1: Answers for the 255.255.192.0 mask


1. 2-2=2 subnets
2. 2-2=16,382 hosts per subnet
3. 256-192=64.0, 128.0
4. Broadcast for the 64.0 subnet is 127.255. Broadcast for the 128.0
subnet is 191.255.
5. The valid hosts are:

Class B
Network Number of
Subnet Mask Number of Hosts
Bits Subnets
/16 255.255.0.0 0 65534
/17 255.255.128.0 2 (0) 32766
/18 255.255.192.0 4 (2) 16382
/19 255.255.224.0 8 (6) 8190
/20 255.255.240.0 16 (14) 4094
/21 255.255.248.0 32 (30) 2046
/22 255.255.252.0 64 (62) 1022
/23 255.255.254.0 128 (126) 510
/24 255.255.255.0 256 (254) 254
255.255.255.12
/25 512 (510) 126
8
255.255.255.19
/26 1024 (1022) 62
2
255.255.255.22
/27 2048 (2046) 30
4
255.255.255.24
/28 4096 (4094) 14
0
255.255.255.24
/29 8192 (8190) 6
8
255.255.255.25
/30 16384 (16382) 2
2
 
Needed Allocated Mas
Subnet Name Size Size Address k Dec Mask Assig
A 704 1022 172.16.0.0 /22 255.255.252.0 172.16
C 337 510 172.16.4.0 /23 255.255.254.0 172.16
B 285 510 172.16.6.0 /23 255.255.254.0 172.16
D 278 510 172.16.8.0 /23 255.255.254.0 172.16

1. School of Applied Computing

Needed
Interface Allocated Size Address
Subnet Name Size
 Open Access- 245        
 Lab308-120        
 Lab410-60        
 Lab301-50        
 Lab306-40        
 Lab412-36        
 Lab302-30        
 Lab303-30        
 Lab411-30        
Staff-25        
Lab305-20
Test Centre-18
Router1
Router2
Router3
2. School of Architecture, Built and Natural Environment

Needed
Interface Allocated Size Address
Subnet Name Size
 Lab301-80        
 Lab206-55        
 Lab301-50        
Lab102-35        
Lab103-30        
 Lab101-25        
Staff-20        
Lab205-20
CAD Lab-20
Router1
Router2
Router3

Needed
Interface Allocated Size Address
Subnet Name Size
 Open Access- 245        
 Lab308-120        
 Lab410-60        
 Lab301-50        
 Lab306-40        
 Lab412-36        
 Lab302-30        
 Lab303-30        
 Lab411-30        
Staff-25        
Lab305-20
Test Centre-18
Router1
Router2
Router3

Needed
Interface Allocated Size Address
Subnet Name Size
 Open Access- 245        
 Lab308-120        
 Lab410-60        
 Lab301-50        
 Lab306-40        
 Lab412-36        
 Lab302-30        
 Lab303-30        
 Lab411-30        
Staff-25        
Lab305-20
Test Centre-18
Router1
Router2
Router3

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