EdTech 552: Lab 3 Answer Sheet
Question 3.1.1
Question
a. 123
b. 202
c. 67
d. 7
e. 252
f. 91
g. 116.127.71.3
h. 255.255.255.0
i. 192.143.255.255
j. 12.101.9.16
Answers
01111011
011001011
01000011
0111
011111100
01011011
0111010.01111111.01000111.00000011
11111111.11111111.11111111.00000000
11000000.10001111.11111111.111111111
00001100.01100101.00001001.00010000
Question 3.2.1
Question
a. 1110
b. 100110
c. 11111111
d. 11010011
e. 01000001
f. 11001110
g. 01110101
h. 10001111
i. 11101001.00011011.10000000.10100100
j. 10101010.00110100.11100110.00010111
Answers
14
38
255
211
65
206
117
143
233.27.128.164
170.52.230.23
Question 3.3.1
1. What is the decimal and binary range of the first octet of all possible Class B IP addresses?
Decimal: From: 128
To: 191
Binary:
From: 10000000
To: 10111111
2. Which octet(s) represent the network portion of a Class C IP address? 1st thru 3rd
3. Which octet(s) represent the host portion of a Class A IP address? 1st
4. What is the maximum number of useable hosts with a Class C network address? 254
5. How many Class B networks are there? 16,384
6. How many hosts can each Class B network have? 65, 534
7. How many octets are there in an IP address? How many bits per octet? 4, 8
EdTech 552: Lab 3 Answer Sheet
Question 3.3.2
Host IP Address
Address
Class
Network
Address
Host
Address
Network Broadcast
Address
Default Subnet
Mask
216.14.55.137
C
216.14.55.0
216.14.55.137
216.14.55.255
255.255.255.0
123.1.1.15
A
123.0.0.0
123.1.1.15
123.255.255.255
255.0.0.0
150.127.221.244
B
150.127.0.0
150.127.221.244
150.127.255.255
255.255.0.0
194.125.35.199
C
194.125.35.0
194.125.35.255
150.125.35.255
255.255.255.0
175.12.239.244
B
175.12.0.0
175.12.239.244
175.12.255.255
255.255.0.0
Question 3.3.3
IP Host Address
Valid Address?
(Yes/No)
Why or Why Not
150.100.255.255
No
Class B broadcast address
175.100.255.18
Yes
Class B
195.234.253.0
No
Class C network address
100.0.0.23
Yes
Class A
188.258.221.176
No
Second number is larger than 255
127.34.25.189
Yes
Class A but the number 127 could be an issue
224.156.217.73
Yes
Class D
EdTech 552: Lab 3 Answer Sheet
Question 3.4.1
Subnet No.
Subnet Bits
Borrowed
Binary
Value
Subnet Bits Decimal
and Subnet No.
Host Bits Possible
Binary Values
(Range) (5 Bits)
Subnet/Host
Decimal Range
Use?
0 Subnet
000
(0) 197.15.22.0
00000-11111
0-31
no
1st Subnet
001
(32) 197.15.22.32
00000-11111
32-63
yes
2nd Subnet
010
(64)197.15.22.64
00000-11111
64-95
yes
3rd Subnet
011
(96)197.15.22.96
00000-11111
96-127
yes
4th Subnet
100
(128)197.15.22.128
00000-11111
128-159
yes
5th Subnet
101
(160)197.15.22.160
00000-11111
160-191
yes
6th Subnet
110
(192)197.15.22.192
00000-11111
192-223
yes
7th Subnet
111
(224)197.15.22.224
00000-11111
224-254
no
Use the table just developed to help answer the following questions:
1. Which octet(s) represent the network portion of a Class C IP address? 1st – 3rd
2. Which octet(s) represent the host portion of a Class C IP address? 4th
3. What is the binary equivalent of the Class C network address in the scenario? 197.15.22.0
Decimal network address: 197.15.22.0
Binary network address: 11000111.00001111.00010110.00000000
4. How many high-order bits were borrowed from the host bits in the fourth octet? 3
5. What subnet mask must be used? Show the subnet mask in decimal and binary.
Decimal subnet mask:
255.255.255.224
Binary subnet mask:
11111111.11111111.111111111.11100000
6.
7.
8.
9.
10.
What is the maximum number of subnets that can be created with this subnet mask? 8
What is the maximum number of useable subnets that can be created with this mask? 6
How many bits were left in the fourth octet for host IDs? 5
How many hosts per subnet can be defined with this subnet mask? 30
What is the maximum number of hosts that can be defined for all subnets with this scenario?
Assume the lowest and highest subnet numbers and the lowest and highest host ID on each subnet
cannot be used. 180
11. Is 197.15.22.63 a valid host IP address with this scenario? Why or why not? No, it’s the broadcast
address
12. Is 197.15.22.160 a valid host IP address with this scenario? Why or why not? No, it’s the network
EdTech 552: Lab 3 Answer Sheet
address
13. Host A has an IP address of 197.15.22.126. Host B has an IP address of 197.15.22.129. Are these
hosts on the same subnet? Why? No. host A is part of the .96-.127 subnet and host B is part of
the .128-.159 subnet
Question 3.5.1
Given a Class A network address of 10.0.0.0 / 24 answer the following questions
1. How many bits were borrowed from the host portion of this address? 16
2. What is the subnet mask for this network?
Dotted decimal? 255.255.255.0
Binary? 11111111.111111111.1111111111.00000000
3.
4.
5.
6.
7.
8.
9.
How many usable subnetworks are there? 16534
How many usable hosts are there per subnet? 254
What is the host range for usable subnet sixteen? 10.0.16.1 to 10.0.16.0.254
What is the network address for usable subnet sixteen? 10.0.16.0
What is the broadcast address for usable subnet sixteen? 10.0.16.255
What is the broadcast address for the last usable subnet? 10.0.254.255
What is the broadcast address for the major network? 10.255.255.255
Question 3.6.1
Given this Class B network address and these requirements answer the following questions
1. How many subnets are needed for this network? 70
2. What is the minimum number of bits that can be borrowed? 7
3. What is the subnet mask for this network?
Dotted decimal? 255.255.254.0
Binary? 11111111.111111111.1111111110.000000000
4. Slash format /23
5. How many usable subnetworks are there? 126
6. How many usable hosts are there per subnet? 510
EdTech 552: Lab 3 Answer Sheet
Question 3.6.2
Subnetwork #
Subnetwork ID
Host Range
Broadcast ID
1
172.16.2.0
172.16.2.1-172.16.3.254
172.16.3.255
2
172.16.4.0
172.16.4.1-172.16.5.254
172.16.5.255
3
172.16.6.0
172.16.6.1-172.16.7.254
172.16.7.255
123
172.16.246.0
172.16.246.1-172.16.247.254
172.16.247.255
124
172.16.248.0
172.16.248.1-172.16.249.254
172.16.249.255
125
172.16.250.0
172.16.250.1-172.16.251.254
172.16.251.255
126
172.16.252.0
172.16.252.1-172.16.253.254
172.16.253.255
127
172.16.254.0
172.16.254.0
Network
1. What is the host range for subnet two? 172.16.4.1-172.16.5.254
2. What is the broadcast address for the 126th subnet? 172.16.253.255
3. What is the broadcast address for the major network? 172.16.255.255
Question 3.7.1
Given this Class C network address and these requirements answer the following questions
1. How many subnets are needed for this network? 5
2. What is the subnet mask for this network?
Dotted decimal? 255.255.255.224
Binary? 111111111.111111111.111111111.11100000
3. Slash format /27
4. How many usable hosts are there per subnet? 30
EdTech 552: Lab 3 Answer Sheet
Question 3.7.2
Subnetwork #
Subnetwork IP
Host Range
Broadcast ID
1
192.168.1.32
.33-.62
.63
2
192.168.1.64
.65-.94
.95
3
192.168.1.96
.97-.126
.127
4
.128
.129-.158
.159
5
.160
.161-.190
.191
6
.192
.193-.222
.223
1. What is the host range for subnet six? .193-.222
2. What is the broadcast address for the 3rd subnet? .127
3. What is the broadcast address for the major network? 192.168.1.255