Question

Given a Class B network and a number of subnets required, complete the table to identify the number of bits to borrow from the host field for the subnet field and the maximum number of host addresses available per subnet.

Number of Subnets Required	Number of Bits to Borrow for the Subnet Field	Maximum Number of Hosts per Subnet	Subnet Mask in Binary and Decimal Representations
5	3    23 = 8	Class B has 16 host bits by definition. If 3 bits are borrowed then there are 13 host bits 213 -2 = 8191 – 2 = 8189	1111111.11111111.111 00000.00000000 255.255.224.0 And in CIDR    /19
8	3
35	6
200	8
400	9

Assume that you have been assigned 192.168.111.129/28.

1. How many bits are borrowed to create the subnet field? ________________
2. What is the maximum number of subnets that can be created with this number of bits? ________________
3. How many bits can be used to create the host space? ________________
4. What is the maximum number of host addresses available per subnet? ________________
5. What is the subnet mask, in binary and decimal format? ________________
6. Complete the following table and calculate the subnet that this address is on, and define all the other subnets (the range of host addresses on the subnet and the directed broadcast address on the subnet).

Subnet Number	Subnet Address	Range of Host Addresses	Direct Broadcast Address
0
1
2
3
4
5
6
7
…
Last subnet number

Answer the following:

1. What subnet is 192.168.111.129 on?
2. A junior network administrator is trying to assign 192.168.111.127 as a static IP address for a computer on the network but is getting an error message. Why?
3. Can 192.168.111.39 be assigned as an IP address?

Answer 1

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