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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: 24–2 = 14
  4.2: 25–2 = 30
  4.3: 26–2 = 62
  4.4: 27–2 = 126
  4.5: 28–2 = 254
  4.6: 29–2 = 510
  4.7: 26–2 = 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 mask255.255.192.0
  b)3-bit mask255.255.224.0
  c)4-bit mask255.255.240.0
  d)5-bit mask255.255.248.0
  e)6-bit mask255.255.252.0
  f)7-bit mask255.255.254.0
  g)8-bit mask255.255.255.0
  h)9-bit mask255.255.255.128
  i)10-bit mask255.255.255.192
  g)11-bit mask255.255.255.224
  k)12-bit mask255.255.255.240
  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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