Need help with this IP address subnet question. Pretty sure I understand 1-5, bu

Question

Need help with this IP address subnet question.

Pretty sure I understand 1-5, but need help with #6.

- IP address is 155.1.0.0. , needs 85 subnets.

network IP address of 155 1.0.0. has three A company Bit-by-Hit Inc. has been assi bnets. You are the network ad divisions that need a total of 85 he submets. Please answer the followi company and are responsible for e questions. (22 peints) t. How many bits do you need to bomow from the host bits for the subeet tield? (1 poimy 2. What is the maximum number of host addresses per submet? point) Iz6 number of IP addresses that can be assigned to a bosM device per What is the maximum subnet?( point) 4 What is the subnet mask in binary representation? 1 point) 5. what is the subnet mask in decimal representation? point 6. Please indicate the following details for the first three submets and last possible subret in the network (16 points) a. Subnet number b. Subnet address e. Range of host addresses that can be assigned to a host device, d. Direct Broadcast address

Explanation / Answer

Question 6:

First thing is that, the IP Address is 155.1.0.0 is a Class B address i.e., the first 16 bits are used to identify the network address. To create subnets, we have to borrow bits from host part.

Now, if we borrow 1 bit, then we can create 2 subnets. If we borrow 2 bits then we can create 4 subnets. The formula is 2n subnets can be created by borrowing n bits.

So, to create 85 subnets we must borrow 7 bits which gives 128 combinations unlike 64 combinations from 6 bits.

Now, if we borrow 7 bits i.e., 7 MSBs from host part then subnet mask will become 11111111 11111111 11111110 00000000 = 255.255.254.0

Direct Broadcast Address is the last address of a subnet.

Valid subnets will be 2, 4. 6,...., 252.

The last subnet for the organization that needs 85 subnets only will be X.X.190.0

Subnet Number Subnet Address Range of hosts Direct Broadcast Address 1 X.X.2.0 X.X.2.1 - X.X.3.254 (510 hosts) X.X.3.255 2 X.X.4.0 X.X.4.1 - X.X.5.254 X.X.5.255 3 X.X.6.0 X.X.6.1 - X.X.7.254 X.X.7.255 Last X.X.252.0 X.X.252.1 - X.X.253.254 X.X.253.255

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