31
In this diagram, you can see the subnet mask with 25-bit long, 255.255.255.128,
contains 126 members in the sub-netted network. Another is that the length of network
prefix equals the number of the bit with 1s in that subnet mask. With this, you can easily
count the number of IP addresses matched. The following table shows the result.
Prefix Length No. of IP matched No. of Addressable IP
/32 1
-
/31 2
-
/30 4
2
/29 8
6
/28 16
14
/27 32
30
/26 64
62
/25 128
126
/24 256
254
/23 512
510
/22 1024
1022
/21 2048
2046
/20 4096
4094
/19 8192
8190
/18 16384
16382
/17 32768
32766
/16 65536
65534
Table 2-4
According to the scheme above, a subnet mask 255.255.255.0 will partition a
network with the class C. It means there will have a maximum of 254 effective nodes
existed in this sub-netted network and is considered a physical network in an autonomous
network. So it owns a network IP address which may looks like 168.1.2.0.
With the subnet mask, a bigger network can be cut into small pieces of network. If
we want to have more than two independent networks in a worknet, a partition to the
network must be performed. In this case, subnet mask must be applied.
Summary of Contents for L2 Plus
Page 1: ......
Page 2: ......
Page 3: ...16 Port SFP 8 Port Combo GbE L2 Plus Managed Switch...
Page 4: ...2...
Page 36: ...34 Fig 2 15 Office Network Connection Fig 2 14 Peer to peer Network Connection...
Page 56: ......
Page 78: ...22 Fig 3 24...
Page 81: ...25 Fig 3 26...
Page 88: ...32 Fig 3 31...
Page 96: ...40 Fig 3 39 Fig 3 40 Fig 3 41...
Page 112: ...56 Fig 3 62 Set up VLAN Tag Priority Mapping Finish...
Page 119: ...63 Fig 3 67 Ingress Port Fig 3 68...
Page 121: ...65 Fig 3 70...
Page 122: ...66 Fig 3 71 Fig 3 72 Fig 3 73 ARP...
Page 123: ...67 Fig 3 74 ARP Fig 3 75 ARP Fig 3 76 ARP Fig 3 77 ARP...
Page 124: ...68 Fig 3 78 ARP Fig 3 79 ARP Fig 3 80 ARP Fig 3 81 ARP...
Page 125: ...69 Fig 3 82 ARP Fig 3 83 ARP Fig 3 84 ARP Fig 3 85 ARP Fig 3 86 ARP...
Page 126: ...70 Fig 3 87 IPv4 Fig 3 88 IPv4 Fig 3 89 IPv4...
Page 127: ...71 Fig 3 90 IPv4 Fig 3 91 IPv4 Fig 3 92 IPv4 Fig 3 93 IPv4 Fig 3 94 IPv4...
Page 128: ...72 Fig 3 95 IPv4 Fig 3 96 IPv4 Fig 3 97 IPv4 Fig 3 98 IPv4 Fig 3 99 IPv4...
Page 129: ...73 Fig 3 100 IPv4 Fig 3 101 IPv4 Fig 3 102 IPv4...
Page 130: ...74 Fig 3 103 IPv4 Fig 3 104 IPv4 Fig 3 105 IPv4...
Page 131: ...75 Fig 3 106 IPv4 Fig 3 107 IPv4 Fig 3 108 IPv4...
Page 132: ...76 Fig 3 109 IPv4 Fig 3 110 IPv4 Fig 3 111 IPv4...
Page 133: ...77 Fig 3 112 IPv4 Fig 3 113 IPv4 Fig 3 114 IPv4...
Page 134: ...78 Fig 3 115 IPv4 Fig 3 116 IPv4 Fig 3 117 Action...
Page 135: ...79 Fig 3 118 Rate Limiter Fig 3 119 Port Copy...
Page 136: ...80 Fig 3 120 DMAC Filter Fig 3 121 VLAN ID Filter Fig 3 122 VLAN ID Filter...
Page 148: ...92 Fig 3 125 Set up Policy Rules Fig 3 126 Set up Policy Rules Fig 3 127 Set up Policy Rules...
Page 150: ...94 Fig 3 131 Set up Port Policies Fig 3 132 Set up Port Policies Finish...
Page 164: ...108 Fig 3 143 802 1X Server Configuration...
Page 168: ...112 Fig 3 145 802 1X Status...
Page 194: ...138 Fig 3 161 Mirror Configuration...
Page 214: ...158 Fig 4 1 Fig 4 2 LGB1005A R2 LGB1005A R2 LGB1005A R2 LGB1005A R2...
