Chapter 1 - IP Addresses
Cisco & IP Addressing
Louis D. Rossi, Louis R. Rossi and Thomas Rossi
Copyright © 1999 The McGraw-Hill Companies, Inc.
Answers
1.1
Octet Value
128
64
32
16
8
4
2
1
202
1
1
0
0
1
0
1
0
141
1
0
0
0
1
1
0
1
170
1
0
1
0
1
0
1
0
241
1
1
1
1
0
0
0
1
31
0
0
0
1
1
1
1
1
254
1
1
1
1
1
1
1
0
1.2:
8 bits in an octet.
1.3:
32 bits in an IP address.
1.4:
4 octets in an IP address.
1.5:
The highest value an octet can have is 255.
1.6:
The 1st octet is used to determine the class of an address.
1.7:
2 bits are used to determine a Class B address.
1.8:
The completed chart:
Address
Default Mask
Class
Wire Address
Host Address
123.34.56.7
255.0.0.0
A
123.0.0.0
0.34.56.7
12.43.98.3
255.0.0.0
A
12.0.0.0
0.43.98.3
191.76.5.34
255.255.0.0
B
191.76.0.0
0.0.5.34
212.45.6.5
255.255.255.0
C
212.45.6.0
0.0.0.5
192.34.5.67
255.255.255.0
C
192.34.5.0
0.0.0.67
1.9:
With a Class C address and the default mask, 8 bits can be changed.
1.10:
With a Class B address and the default mask, 16 bits can be changed.
1.11:
With a Class A address and the default mask, 24 bits can be changed.
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