# What is subnetting Class B addresses?

## What is subnetting Class B addresses?

Class B networks use a default subnet mask of 255.255. 0.0 and have 128-191 as their first octet. The address 172.16. 52.63 is a class B address. Its first octet is 172, which is between 128 and 191, inclusive.

How many addresses are there in a class B subnet?

Class B Address x.x. The default subnet mask for Class B is 255.255. x.x. Class B has 16384 (214) Network addresses and 65534 (216-2) Host addresses.

### What do well chosen subnets accomplish?

What do well-chosen subnets accomplish? Routing efficiency is decreased by ensuring IP address spaces are not mathematically related. IP address spaces overlap for easier management. Network documentation is easier to manage.

How many hosts are in a class B network?

Table 2-1 IP Addresses Available to Internet Hosts

Address Class First Octet Range Number of Hosts Per Network
Class A 0 to 126 16,777,214
Class B 128 to 191 65,534
Class C 192 to 223 254

#### How many hosts are in a subnet?

You need to create 5 sub networks each network has a maximum of 10 hosts. We can only use the first 8 bits for out subnets as these 8 bits have been allocated as host addresses. So Subnet masks of 255.255. 255.224 and 255.255.

How is subnetting calculated?

The number of subnets is found by counting the number of bits by which the initial mask was extended, also known as the subnet bits. Our initial address allocation was 192.168. 0.0 with a mask of 255.255. 0.0.

## What is a subnet example?

For example, the prefix 198.51. 100.0/24 would have the subnet mask 255.255. 255.0. Traffic is exchanged between subnetworks through routers when the routing prefixes of the source address and the destination address differ.

How do you calculate class subnetting?

Valid subnet address: To figure out the valid subnet address, simply subtract the subnet mask from 256. For example, if you had a Class A mask of 255.240. 0.0, the equation would be 256-240=16….The first available subnet is:

1. Subnet: 10.0. 0.0.
3. Valid host range: 10.0. 0.1 through 10.0. 127.254.

### How many network bits and host bits are there in Class B?

16 bits
A class B network number uses 16 bits for the network number and 16 bits for host numbers. The first byte of a class B network number is in the range 128-191. In the number 129.144.

Why is a Bpdu filter needed at the demarc?

Why is a BPDU filter needed at the demarc point? To prevent the ISP’s WAN topology from mixing with the corporate network’s topology for the purpose of plotting STP paths.

#### What is the subnet mask for Class B?

– 2-2=510 subnets – 2-2=126 hosts per subnet – For the third octet, the mask would be 256-255=1, 2, 3, 4, 5, 6, etc. – For the fourth octet, the mask would be 256-128=128, which is one subnet if it is used. – Broadcast for the 0.128 subnet is 128.255; the broadcast for the 1.0 subnet is 1.127. – The valid hosts are:

What is IP address Class B subnetting?

For 1st Subnet,1st valid IP is 172.16.0.1/26,last valid IP is 172.16.0.62/26,and broadcast IP is 172.16.0.63/26

• For 2nd Subnet,1st valid IP is 172.16.0.65/26,last valid IP is 172.16.0.126/26,and broadcast IP is 172.16.0.127/26
• For 3rd Subnet,1st valid IP is 172.16.0.129/26,last valid IP is 172.16.0.190/26,and broadcast IP is 172.16.0.191/26
• ## How to create subnets?

In the left navigation pane,choose Subnets and then Create Subnet .

• For Name tag,enter a name for your subnet,such as Public subnet .
• For VPC,choose the VPC that you created earlier.
• For Availability Zone,choose the same Availability Zone as the additional private subnet that you created in the previous procedure.
• How to master subnetting?

– Pulse-width modulator, frequency generator – “Wait until interrupt” command – Convert frequency measurement to input capture peripheral – Allow frequency measurement on any pin – Show a report of the current configuration settings and pin states. – Integer repeat values for bulk read, clock ticks, delays, etc. – A CRC generator