Tomsho Technical Treatises

Errata - Guide to Networking Essentials, 6th Edition

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Chapter  3

1. p. 141, 2^nd paragraph, 2^nd sentence reads “…all workstations can communicate with the AP:” Should read: “…all workstations can communicate with the AP but cannot hear each other:”
   (Hat tip: Derrf Seitz)

Chapter 4

1. p. 188 under Wireless Benefits, 2^nd paragraph reads “Although wireless networking is invariably more expensive than cable-based alternatives…” This is no longer true and this comment should be deleted or reworded.
   (Hat tip: Derrf Seitz)
2.   p. 193 Last sentence of the last paragraph reads: “802.11b/g/n networks using the 2.4 GHz frequency use direct sequence spread spectrum (DSSS).”  It should read “The original 802.11 and 802.11b specifications use direct sequence spread spectrum (DSSS).”
3. p.193 Note at the bottom of the page reads “Orthogonal frequency divisional multiplexing (OFDM) is a spread-spectrum technology used by the 802.11a 5 GHz standard and the 802.16 WiMAX standard.”  It should read: “Orthogonal frequency divisional multiplexing (OFDM) is a spread-spectrum technology used by 802.11g/n 2.4 GHz and the 802.11a 5 GHz standards and the 802.16 WiMAX standard.”
4. p. 194 Table 4-5: Cell boundaries is not defined in the text. Cell boundaries are “the 'service area' or the radius of viable signal.” 
   (Hat tip: Derrf Seitz)
5. p. 197 Chapter Summary, 2^nd bullet reads: “network today.”, should read “networks today.”
   (Hat tip: Derrf Seitz)
6. p. 198 Key Terms: reads: “encoding term”, should be “encoding”
   (Hat tip: Derrf Seitz)

Chapter 5

1. p. 217, Figure 5-7. The box labeled “Message to Computer2” has the wrong Src MAC. The Src MAC should be the MAC address of Router R3 (the MAC address of R3 is not shown in the figure), not the MAC address of Computer1.  (Thanks to James Pierce for pointing out this error.) A corrected figure is shown here (if you can't see the entire figure,download the PDF, above.:
2. p. 232 – three bullet items under IP Address Classes: The example addresses are missing the 0 for the last octet.

• Class A address example, the sentence should read “… for example, the network ID is 21.0.0.0”
• Class B address example, the sentence should read “… for example, the network ID is 172.17.0.0”
• Class C address example, the sentence should read “… for example, the network ID is 211.255.49.0”

(Hat tip: Robert Kleefisch)

        3.  p. 240, under Converting Decimal to Binary, reads: “…write down the dividend, and repeat until the dividend is 0.” Should read: “…write down the quotient, which becomes the new dividend, and repeat until the quotient is 0.”
(Hat tip: Derrf Seitz)

         4.  p. 240, last paragraph, reads: “…most work can be done 8 bits at time.” Should read: “…most work can be done 8 bits at a time.”
(Hat tip: Derrf Seitz)

  5.  p. 243, paragraph labeled 2.; last sentence should read "...because reallocating 4 bits gives you only 2⁴ or 16 subnets."  The 4 should be superscript.

          6. p. 245, last sentence, reads: “… because they’re the only 2 bits that are 1 in the third octet.” Should read: “… because they’re the only 2 bits that are 1 in the last octet.”
(Hat tip: Derrf Seitz)

Chapter 6

     1.  p. 273, Figure 6-8 The bracket above Network-layer PDU – Packet should end after the Data field since a packet does not include the FCS.
(Hat tip: Derrf Seitz)

Chapter 8

1. P. 362 in the bulleted item “DHCP server service” change ‘listens on UDP port 69’ to ‘listens on UDP port 67’.

Chapter 9

1. p. 419 in the note at the top of the page.  The note erroneously states that disk quotas are not available in the client versions of Windows.  Disk quotas are available on versions of Windows that use NTFS v.4.0 and above.