Unit 8

Exercise 8.1.1

What is the network ID?
110

What is the host ID?
10.10.1

What is the binary value of the network ID?
192

What is the binary value of the host ID?
21

Exercise 8.1.2

Class
Range of First Byte (Octet) in Decimal
Network ID
Host ID
Possible Networks
Possible Hosts per Network
A
0-127
A
b.c.d
27
224
B
128-191
A.B
c.d
214
216
C
192-223
A.B.C
d
221
28

Exercise 8.1.3

Would the IP address be valid as a Class C address?
Yes

Why or why not?
The first octet is 192 which would be in Class C

Exercise 8.1.4

What is the network ID of the IP address?
190.8

What is the host ID of the IP Address?
8.4

What is the binary network ID?
10111110.1000

What is the binary host ID?
1000.100

Exercise 8.1.5

What is the slash notation equivalent of subnet mask 255.255.255.0?
11111111.11111111.11111111.000000002
Count the “ones” = 24
/24

What is the slash notation equivalent of subnet mask 255.128.0.0?
11111111.10000000.00000000.000000002
Count the “ones” = 9
/9

Exercise 8.1.6

Block Size
Starting IP Address
Ending IP Address
Subnet Mask (Slash Notation)
24-bit block
10.0.0.0
10.255.255.255
255.0.0.0
20-bit block
172.16.0.0
172.31.255.255
255.255.0.0
16-bit block
192.168.0.0
192.168.255.255
255.255.255.0

Lab 8.1 Review

1. What class of address is it?
Class C

Are you able to identify it based on the first octet, by the subnet mask, or both?
Both

Is your IP address part of the private address block?
No

2. Does the use of subnet masking invalidate any of the classful address assignments in IPv4 or does it expand the addressing capabilities while upholding the class rules for older addresses?
It does not. It follows the rules allowing all connected devices to work while under some variant of an individual IP address.