LAN Switching and Wireless
CCNA Exploration Companion Guide
1st Edition
Refreshed edition of 1-58713-207-9 / 978-1-58713-207-0
Copyright 2008 Cisco Systems, Inc.
Copyright © 2012 Cisco Systems, Inc.
ISBN-10: 1-58713-273-7
ISBN-13: 9-781-58713-273-5
Warning and Disclaimer
Every effort has been made to make this book as complete and as accurate as possible, but no warranty
or fitness is implied. The information provided is on an "as is" basis. The author and the publisher shall
have neither liability nor responsibility to any person or entity with respect to any loss or damages arising
from the information contained in this book or from the use of the CD or programs accompanying it.
When reviewing corrections, always check the print number of your book. Corrections are made to
printed books with each subsequent printing.
First Printing: April 2008
Corrections for all Printings
Pg
Error
Correction
Chapter 2, Page 49
Figure 2-3
Reads: Local
Should read: U/L
Chapter 2, Page 49
Figure 2-3
Reads: Vendor Assigned
Should read: Universally or Locally
Administered Address Bit
Chapter 2, Page 49
Reads: The broadcast or multicast bit
in a MAC address indicates to the
Should read: The broadcast/multicast bit in
a MAC address indicates to the receiving
Updated 12/17/2010
Third paragraph
receiving interface that the frame is
destined for all or a group of end
stations on the LAN segment.
interface that the frame is destined for all or
a group of end stations on the LAN segment.
Chapter 2, Page 49
Fourth Paragraph
Reads: The locally administered
address bit indicates whether the
vendor-assigned MAC address can be
modified locally.
Should read: Universally administered
addresses have the U/L bit set to 0 and they
are globally/universally unique – this is the
normal case. If the U/L bit is set to 1, the
entire address (all 48 bits) have been locally
administered and may not be globally
unique.
Chapter 2, Page 71,
Switch Book
Sequence - Second
Paragraph, first
sentence
Reads: The switch loads the boot
loader software. The book loader is a
small program stored in non-volatile
RAM (NVRAM) and is run when the
switch is first turned on.
Should read: The switch loads the boot
loader software. The book loader is a small
program stored in non-volatile ROM and is
run when the switch is first turned on.
Chapter 2, Page 86
Caution line
Reads: If no password is defined and
Should read: When there is no password on
login is still enabled, there is no access the console line, the user will still have
to the console.
access to the console.
Chapter 2, Page 88
Step 3
Reads: Remove the password from
the console line using the no password
command: If no password is defined
and login is still enabled, there is no
access to the console.
Should read: Remove the password from the
vty lines using the no password command: If
no password is defined and login is still
enabled, there is no access to the console.
Chapter 2, Page 106
Reads: If you disable sticky learning
by using the no switchport portsecurity mac-address sticky interface
configuration command, the sticky
secure MAC addresses remain part of
the running configuration but are
removed from the address table.
Reads: S1 (config – if)# switchport
trunk allowed vlan add vlan-list
Should read: If you disable sticky learning
by using the no switchport port-security macaddress sticky interface configuration
command, the sticky secure MAC addresses
remain part of the address table but are
removed from the running configuration.
Tenth line down
Chapter 3, Page 161
Table 3-7
Should read: S1 (config – if)# switchport
trunk allowed vlan vlan-list
Updated 12/17/2010
Chapter 3, Page 162
Example 3-16
Reads: S1 (config – if)# swtichport
trunk allowed vlan add 10,20,30
Should read: S1 (config – if)# swtichport
trunk allowed vlan 10,20,30
Chapter 4, Page 191
Figure 4-12
Reads: DSAP = AA
SSAP = AA
Should read: OUI: cisco
Type: 2003
Chapter 4, Page 192
First Bullet
Reads: SNAP field: Subnetwork Access Should Read: SNAP field: Subnetwork Access
Protocol (SNAP) field has an OUI set to Protocol (SNAP) field has an OUI set to cisco
AAAA and type set to 2003.
and type set to 2003.
Chapter 5, Page 296
Figure 5-70
Column ‘Flag Field’ reads:
Bits
7
6
(indent bits under 2-3 4-5
(00, 01, 10, 11))
00
01
10
11
3
2
1
0
Chapter 5, Page 296
Reads: Bits 0 and 7 are used for
First Bullet
topology change notification and
acknowledgement as they are in
802.1D.
Chapter 5, Page 296
Reads: Bits 4 and 5 are used to
encode the port role using a 2-bit
Last Bullet
code.
Chapter 5, Page 301
Reads: Next, synchronization begins
Last Paragraph
between S1 and S4. The proposal
BPDU received from S1 on port F0/5
has a higher path cost than the cached
value so all non-edge ports are
blocked.
Column ‘Flag Field’ should read:
Bits
0
1
2-3
00
01
10
11
4
5
6
7
Should read: Bits 0 and 7 are used for
topology change (TC) and acknowledgement
(TCA), respectively.
Should read: Bits 2 and 3 are used to encode
the port role using a 2-bit code.
Should read: Next, synchronization begins
between S1 and S4. The proposal BPDU
received from S1 on port F0/5 has a lower
path cost than the cached value so all nonedge ports are blocked.
Updated 12/17/2010
Chapter 5, Page 303
Caption Under Figure
5-79
Chapter 5, Page 327
Example 5-28
Chapter 6, Page 335
Figure 6-3
Chapter 6, Page 336
Reads:The proposal BPDU received
from S4 on port F0/2 has a higher
path cost than the cached value so all
non-edge ports are blocked; Port F0/3
on S2 is blocked during the
synchronization period.
Last line in box:
Reads:
VLAN0001
Label for R1
Reads: R1- F0/1
enabled
Should read: Reads: The proposal BPDU
received from S4 on port F0/2 has a lower
path cost than the cached value so all nonedge ports are blocked; Port F0/3 on S2 is
blocked during the synchronization period.
Should read:
VLAN0001
disabled
Should read: R1 – F0/0
Reads:
3. Switch S1 forwards the tagged
traffic out the other trunk interface on
port F0/5 to interface F0/1 on router
R1.
Label for R1
Reads: R1 – F0/1
Should read:
3. Switch S1 forwards the tagged traffic out
the other trunk interface on port F0/5 to
interface F0/0 on router R1.
Chapter 7, Page 416
Second, Third Fourth
and Fifth Bulleted
Points
Reads: ‘older’
Should read: ‘newer’
Chapter 7, Page 417
Figure 7-43
Reads: (top right hand side of figure)
PSK Personal
Should read: (top right hand side of figure)
PSK2 Personal
Chapter 7, Page 417
Figure 7-43
Reads: (bottom left hand side of
figure)
PSK2 Enterprise
Should read: (bottom left hand side of
figure)
PSK Enterprise
Number 3
Chapter 6, Page 342
Figure 6-6
Should read: R1 – F0/0
Updated 12/17/2010
This errata sheet is intended to provide updated technical information. Spelling and grammar misprints
are updated during the reprint process, but are not listed on this errata sheet.
Updated 12/17/2010