Errata

Packet Guide to Core Network Protocols

Errata for Packet Guide to Core Network Protocols

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The errata list is a list of errors and their corrections that were found after the product was released.

The following errata were submitted by our customers and have not yet been approved or disproved by the author or editor. They solely represent the opinion of the customer.

Color Key: Serious technical mistake Minor technical mistake Language or formatting error Typo Question Note Update

Version Location Description Submitted by Date submitted
Printed Page 56
table 3-5

Networking addressing column should read:
8 bits
16 bits
21 bits

Class A addresses have 8 network bits, Class B addresses have 16 network bits and Class C addresses have 24 network bits. You are logically confusing number of networks with the identification of what bits are used for the network portion of the address. It is correct that there are 2^7 class A networks (not excluding loopback and zero network), but the first 8 bits are still needed to correctly identify the network address of each network, hence there are still 8 bits used for network addressing.

 Richard Meredith  Mar 28, 2018