Errata
p. 23. First paragraph, second to the last sentence, should read as follows (changes in bold): “. . .followed by a special field for error detection called the frame check sequence (FCS).
pp. 23-27. The figures listing the sending and receiving MAC addresses show both a 12- and a 13-digit MAC address. MAC addresses are 48-bits and should be displayed as 12 hexadecimal characters.
pp. 40-41. A number of protocols function on more than one OSI layer and can include Layer 6, Presentation. The two encryption protocols used in e-commerce, TLS and SSL, for example, initiate at Layer 5, then encrypt and decrypt at Layer 6. It makes for some confusion. Modern network discussions, therefore, work better using the TCP/IP model where the OSI Layers 5-7 are lumped together as the Application layer.
p. 52. Question 7, replace “bit” with “field” in reference to the FCS.
p. 93. The Exam Tip needs to change. When CompTIA added performance-based questions to the exam, they started testing on memorizing the T568A and T568B color codes. Memorize the two standards to get that question correct on the exam.
p. 208. The Owner’s IP address in Figure 7-35 has a typo in the fourth octet. Rather than 120, it should be any number between 129 and 190.
p. 239. The fifth sentence in the first paragraph under “The Setup” suggests a network ID with a /29 subnet. This should be /28 to reflect support for 9+ nodes on the network.
p. 240. The WAN address listed in Figure 8-14 should be 208.190.121.12, not 192.168.1.1.
p. 456. Question 1, Answer A. has an extra character in the second hextet. It should read: 2001:bead:beef::1
p. 473. The penultimate sentence of the first paragraph should read “= 7.77 gigabits per second,” not gigabytes per second.
p. 704. The distances for 1000BaseLX and 1000BaseSX are reversed. The former has a 5-km maximum distance; the latter tops out at 500 m.