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Chapter 9: Scenarios for Final Preparation
Solutions to Scenario 9-1, Part A--Planning
Keeping the design as simple as possible, yet without making it too simple so as not to be useful
as the network evolves, is a good practice. In these suggested answers, the numbering scheme
is chosen to help those of us with fading memories.
1
The IP subnet design includes the use of mask 255.255.255.128. The design criteria leaves
enough ambiguity that you could argue that any mask with at least 7 host bits was valid;
therefore, the much easier mask of 255.255.255.0 would be valid. However, I chose a
more challenging mask, just to give you more difficult practice.
2
The IPX network number assignment is simply a matter of choosing numbers; these
are recorded, along with the IP addresses, in Table 9-3. The IP addresses are assigned in
Table 9-4.
Table 9-3
Scenario 9-1, Part A--IP Subnet and IPX Network Planning Chart Completed
Location of Subnet/
Network Geographically
Subnet Mask
Subnet Number
IPX Network
R1 Ethernet
255.255.255.128
163.1.1.128
1
R2 Ethernet
255.255.255.128
163.1.2.128
2
R3 Ethernet
255.255.255.128
163.1.3.128
3
Serial between R1 and R2
255.255.255.128
163.1.12.128
12
Serial between R1 and R3
255.255.255.128
163.1.13.128
13
Serial between R2 and R3
255.255.255.128
163.1.23.128
23
Server 1 internal
--
--
101
Server 2 internal
--
--
102
Server 3 internal
--
--
103
Table 9-4
Scenario 9-1, Part A--IP Address Planning Chart Completed
Host
Address
PC11
163.1.1.211
PC12
163.1.1.212
PC13
163.1.1.213
PC21
163.1.2.221
PC31
163.1.3.231
PC32
163.1.3.232
R1-E0
163.1.1.201
R1-S0
163.1.12.201
ch09.fm Page 644 Monday, March 20, 2000 5:23 PM