Errata
Necessary changes to make are in red in column ‘Printed’ and in blue in column ‘Should be’
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Page |
Place |
Printed |
Should be |
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599 |
Table 17.3 |
Option 1(0x1) |
Option 2(0x2) |
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628 |
The last sentence |
Here, there are three routs to networks (records 56.0.0.0, 116.0.0.0, and 129.13.0.0), two records on the directly connected networks (129.13.0.0 and 213.34.12.0), and a record on the default route. |
Here, there are three routs to networks (records 56.0.0.0, 116.0.0.0, and 129.13.0.0), two records on the directly connected networks (198.21.17.0 and 213.34.12.0), and a record on the default route. |
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629 |
Table 18.4, fourth record |
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641 |
Table 18.8, first record |
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643 |
4th paragraph |
For numbering hosts in such a degenerate network, it is sufficient to allocate 2 bits. Of four possible combinations of host numbers – 00, 01, 10 and 11 – two numbers have special meaning and cannot be assigned to hosts. However, the remaining two numbers, 10 and 01, are enough for addressing router ports. The host number field in this case has a length of 2 bits, and the mask in decimal notation will appear as follows: 255.255.255.252. |
For numbering hosts in such a degenerate network, it is sufficient to allocate 2 bits; however in our example we chose to use 3 bits in order to have some spare addresses for the future extension of the subnet. Of eight possible combinations of host numbers – 000, 001, 010, 011, 100, 101, 110, and 111- two numbers, 000 and 111, have a special meaning and cannot be assigned to hosts. However, the remaining six numbers - 001, 010, 011, 100, 101 and 110 are enough for addressing two router ports and leave space of four addresses for the subnet extension. The host number field in this case has a length of 3 bits, and the mask in decimal notation will appear as follows: 255.255.255.248. |
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688 |
Figure 19.12, top line |
2,354 2,355 3,816 2,355 5,275 5,276 8,400 |
2,354 2,355 3,816 3,817 5,275 5,276 8,400
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