678 Chapter 9: Scenarios for Final Preparation
Solutions to Scenario 9-3, Part A--Planning Answers
The IP subnet design includes the use of mask 255.255.254.0. The same mask is used
throughout the network, therefore at least 9 host bits are needed because at least one subnet
contains 300 hosts.
The IPX network number assignment process is straightforward when using multiple
encapsulations on the same Ethernet--you simply have to chose two different network
numbers, one per encapsulation type. Each encapsulation type on the router requires the use of
a separate IPX network. The subnets, networks, and IP addresses are recorded in Table 9-13 and
Table 9-14.
Table 9-12
Scenario 9-3, Part A--IP Subnet Planning Chart
Subnet Number
Subnet Broadcast Address
Range of Valid Addresses
Table 9-13
Scenario 9-3, Part A--IP Subnet and IPX Network Planning Chart Completed
Location of Subnet/
Network Geographically
Subnet Mask
Subnet Number
IPX Network
Ethernet off R1
255.255.254.0
170.1.2.0
2, 3
Ethernet off R2
255.255.254.0
170.1.4.0
4, 5
Ethernet off R3
255.255.254.0
170.1.6.0
6, 7
Ethernet off R4
255.255.254.0
170.1.8.0
8, 9
Virtual circuit between R1
and R2
255.255.254.0
170.1.10.0
10
Virtual circuit between R1
and R3
255.255.254.0
170.1.12.0
12
Virtual circuit between R1
and R4
255.255.254.0
170.1.14.0
14
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ch09.fm Page 678 Monday, March 20, 2000 5:23 PM