Solve problems and answer questions. See the tables below.

Network	Mask	Bitmask	Hosts	First host
219.19.29.0	255.255.255.248
219.19.29.0		/21

Table 1. Masks and hosts

Department	Requested size	Allocated hosts	Subnet Address	Mask
Accounting	25
Marketing	35
Human Resources	30
Shipping	10
IT	15

Table 2. Organizational subnets

IP address	Mask bits	Dot-decimal mask	Network address	Broadcast address
192.13.109.46	/30
3.1.0.1		255.224.0.0
10.99.100.247			10.99.0.0
108.170.192.0	/18

Table 3. Masks and broadcast

Host	Mask	Subnet
172.20.34.94	255.255.254.0
172.20.34.94	255.255.224.0
172.20.34.94	255.255.192.0
172.20.34.94	255.255.128.0
172.20.34.94	255.254.0.0

Table 4. Subnets

Address	Mask	Network address	First host	Last host
192.168.193.203	255.255.255.248
192.168.193.203	255.255.254.0
192.168.193.203	255.255.224
192.168.193.203	252.0.0.0

Table 5. Hosts and networks

Name	Allocated size	Address	Mask	First host	Last host
A
B
C
D

Table 6. Organizational network

Questions

1. What are the subnet mask, first available host address of subnet one (NOT subnet zero), and the maximum number of hosts per subnet for the network below?. See Table 1.
2. Suppose you are an ISP that owns a /22 IPv4 address block. Can you accommodate requests from six customers who need addresses for 9, 15, 20, 41, 128, and 260 computers, respectively? If so, how? If not, explain why.
3. Five departments of the company X requested 10, 15, 25, 30, and 35 host addresses respectively. Can this request be accommodated if the available subnet is 192.168.10.0/24?
4. You are designing a subnet mask for the 172.31.0.0 network. You want 110 subnets with up to 300 hosts on each subnet. What subnet mask should you use?
5. What is the last valid host on the subnetwork 172.24.173.128/27?
6. Fill the blanks in Table 3.
7. Fill the blanks in Table 4.
8. Fill the blanks in Table 5.
9. A large number of consecutive IP addresses are available starting at 192.168.0.0. Suppose that four organizations (A, B, C and D) request 4000, 2000, 4000 and 8000 addresses, respectively and in that order. For each of these, find the first and the last IP address assigned. See Table 6.

REFERENCES

http://en.wikipedia.org/wiki/Internet_Protocol

http://www.subnet-calculator.com/