Chapter 4 - Class B Addresses
Cisco & IP Addressing
Louis D. Rossi, Louis R. Rossi and Thomas Rossi
Copyright © 1999 The McGraw-Hill Companies, Inc.
Answers
4.1:
2
4
–2 = 14
4.2:
2
5
–2 = 30
4.3:
2
6
–2 = 62
4.4:
2
7
–2 = 126
4.5:
2
8
–2 = 254
4.6:
2
9
–2 = 510
4.7:
2
6
–2 = 62
4.8:
A 7- or 8-bit mask still leaves 9 or 8 bits respectively for host addressing.
4.9:
In most cases no, because there is no addressing space with a single-bit mask. The zero subnet can be used in certain circumstances.
4.10:
a)
2-bit mask
255.255.192.0
b)
3-bit mask
255.255.224.0
c)
4-bit mask
255.255.240.0
d)
5-bit mask
255.255.248.0
e)
6-bit mask
255.255.252.0
f)
7-bit mask
255.255.254.0
g)
8-bit mask
255.255.255.0
h)
9-bit mask
255.255.255.128
i)
10-bit mask
255.255.255.192
g)
11-bit mask
255.255.255.224
k)
12-bit mask
255.255.255.240
4.11:
Host Address
Class
Mask
Wire Address
Broadcast Address
132.24.64.78
B
255.255.255.248
132.24.64.72
132.24.64.79
167.10.56.34
B
255.255.224.0
167.10.32.0
167.10.63.255
143.34.23.200
B
255.255.255.128
143.34.23.128
143.34.23.255
139.10.69.134
B
255.255.248.0
139.10.64.0
139.10.71.255
191.12.29.3
B
255.255.252.0
191.12.28.0
191.12.31.255
4.12:
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