A subnet mask of 255.255.255.0 (/24) is chosen, which provides a maximum
number of 254 hosts per subnet.
Tables 2-2, 2-3, and 2-4 show the allocation of VLANs and IP subnets in the buildings.
Table 2-2 Building A: VLANs and IP Subnets
Department VLAN IP Subnet Address
IT VLAN 11 10.1.1.0/24
Human Resources VLAN 12 10.1.2.0/24
For future growth 10.1.3.0??“10.1.255.0
Table 2-3 Building B: VLANs and IP Subnets
Department VLAN IP Subnet Address
Sales VLAN 21 10.2.1.0/24
Marketing VLAN 22 10.2.2.0/24
For future growth 10.2.3.0??“10.2.255.0
Table 2-4 Building C: VLANs and IP Subnets
Department VLAN IP Subnet Address
Finance VLAN 31 10.3.1.0/24
Accounting VLAN 32 10.3.2.0/24
For future growth 10.3.3.0??“10.3.255.0
20 Chapter 2: Medium-Sized Switched Network Construction
Some of the currently unused VLANs and IP subnets will be used to manage the network
devices. If the company decides to implement IP telephony, for example, some of the
unused VLANs and IP subnets are allocated to the voice VLANs.
Considering Traffic Source to Destination Paths
When you are designing and implementing networks, a key factor for VLAN deployment
is understanding the traf?¬?c patterns and the various traf?¬?c types.
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