Wavetronix Click 342 (lean managed ethernet switch) (CLK-342) - Managed Switches User Guide - Manual (Page 19)

18 CHAPTER 1 • CLICK 340/341/342 MANAGED SWITCHES
Figure 2.3 – Class B Subnet Mask
Using this subnet mask, the TCP/IP protocol software differentiates between the devices
that are connected to the local subnetwork and the devices that are located in other sub-
networks.
Example
Device 1 wants to establish a connection with device 2 using the above subnet mask.
Device 2 has IP address 59.EA.55.32.
IP address display for device 2:
˽ Hexadecimal representation: 59.EA.55.32
˽ Binary representation: 0101 1001.1110 1010.0101 0101.0011 0010
The individual subnet mask and the IP address for device 2 are then ANDed bit-by-bit by
the software to determine whether device 2 is located in the local subnetwork. The figure
below shows the ANDing of the subnet mask and IP address for device 2 (see Figure 2.4).
Figure 2.4 – ANDing the Subnet Mask and IP Address
After ANDing, the software determines that the relevant subnetwork (01) does not cor-
respond to the local subnetwork (11) and the data telegram is forwarded to a subnetwork
router.
Flowchart After a Restart
The figure below is a flowchart showing how to load Configuration Data (see Figure 2.5).