8- and 24-Port Gigabit L2 Managed Power-over-Ethernet (PoE) Switches
724-746-5500 | blackbox.com
24
According to the scheme above, a subnet mask 255.255.255.0 will partition a network with the class C. A maximum of 254 effective nodes
exist in this sub-netted network. It is considered a physical network in an autonomous network, so it owns a network IP address, for
example, 168.1.2.0.
With the subnet mask, a bigger network can be divided into smaller networks. If you want to have more than two independent networks in
a worknet, you can partition the network. In this case, subnet mask must be applied.
For different network applications, the subnet mask might be 255.255.255.240. This small network accommodates a maximum of 15 nodes.
3.5.3 Default Gateway
For the routed packet, if the destination is not in the routing table, all the traffic is sent to the device with the designated IP address, known
as the default router. The gateway setting is used for Trap Events Host only in the switch.
Before assigning an IP address to the switch, check to see what IP address of the network will be connected with the switch. Use the same
network address and append your host address to it.
Figure 3-12
First, type in the IP Address: as shown in Fig. 2-12, enter default IP address “192.168.1.1,” for instance. An IP address such as 192.168.1.x
must be set on your PC.
Second, type in the Subnet Mask: as shown in Fig. 2-12, enter “255.255.255.0.” Any subnet mask such as 255.255.255.x is allowed in this
case.
3.5.4 DNS
The Domain Name Server translates human-readable machine names to IP addresses. Every machine on the Internet has a unique IP
address. A server has a static IP address. To connect to a server, the client needs to know the IP of the server. However, users generally
use the name to connect to the server. Thus, the switch DNS client program (such as a browser) will ask the DNS to resolve the IP address
of the named server.
3.6 Typical Application
LPB4008A implements 8 Gigabit Ethernet TP ports with Auto MDI-X and two slots for the removable module supporting fiber connections,
including LC and BiDi-LC SFP modules. LPB4024A has 20 Gigaibit Ethernet TP ports with Auto-MDIX and four slots for fiber modules.
The switch is suitable for the following applications.
• Edge Site/Remote site application is used in PoE environment (See Figure 3-13).
• Peer-to-peer application is used in two remote offices (See Figure 3-14).
• Office network (See Figure 3-15).
