22
Class D and E:
Class D is a class with first 4 MSB (Most significance bit) set to 1-1-1-0 and
is used for IP Multicast. See also RFC 1112. Class E is a class with first 4 MSB set
to 1-1-1-1 and is used for IP broadcast.
According to IANA (Internet Assigned Numbers Authority), there are three
specific IP address blocks reserved and able to be used for extending internal
network. We call it Private IP address and list below:
Class A
10.0.0.0 --- 10.255.255.255
Class B
172.16.0.0 --- 172.31.255.255
Class C
192.168.0.0 --- 192.168.255.255
Please refer to RFC 1597 and RFC 1466 for more information.
Subnet mask:
It means the sub-division of a class-based network or a CIDR block. The
subnet is used to determine how to split an IP address to the network prefix and the
host address in bitwise basis. It is designed to utilize IP address more efficiently and
ease to manage IP network.
For a class B network, 128.1.2.3, it may have a subnet mask 255.255.0.0 in
default, in which the first two bytes is with all 1s. This means more than 60
thousands of nodes in flat IP address will be at the same network. It’s too large to
manage practically. Now if we divide it into smaller network by extending network
prefix from 16 bits to, say 24 bits, that’s using its third byte to subnet this class B
network. Now it has a subnet mask 255.255.255.0, in which each bit of the first
three bytes is 1. It’s now clear that the first two bytes is used to identify the class B
network, the third byte is used to identify the subnet within this class B network and,
of course, the last byte is the host number.
Not all IP address is available in the sub-netted network. Two special
addresses are reserved. They are the addresses with all zero’s and all one’s host
number. For example, an IP address 128.1.2.128, what IP address reserved will be
looked like? All 0s mean the network itself, and all 1s mean IP broadcast.
10000000.00000001.00000010.1 0000000
128.1.2.128/25
25 bits
1 0000000
1 1111111
All 0s = 128.1.2.128
All 1s= 128.1.2.255
Subnet
Network
Содержание LGB1002A-R2
Страница 1: ...i 16 Port 1000BASE TX L2 Plus Managed Ethernet Switch...
Страница 5: ...v Revision History Release Date Revision 0 91 2008 03 12 A1 0 95 2008 06 30 A2...
Страница 32: ...26 Fig 2 15 Office Network Connection Fig 2 14 Peer to peer Network Connection...
Страница 43: ...37 Fig 3 6...
Страница 71: ...65 Fig 3 24...
Страница 89: ...83 Fig 3 39 Fig 3 40 Fig 3 41...
Страница 101: ...95 Fig 3 54 Set up Typical Network Application Rules Finish Fig 3 55 Set up Typical Network Application Rules Finish...
Страница 105: ...99 Fig 3 62 Set up VLAN Tag Priority Mapping Finish...
Страница 113: ...107 Fig 3 69 Frame Type Fig 3 70...
Страница 114: ...108 Fig 3 71 Fig 3 72 Fig 3 73 ARP...
Страница 115: ...109 Fig 3 74 ARP Fig 3 75 ARP Fig 3 76 ARP Fig 3 77 ARP...
Страница 116: ...110 Fig 3 78 ARP Fig 3 79 ARP Fig 3 80 ARP Fig 3 81 ARP...
Страница 117: ...111 Fig 3 83 ARP Fig 3 84 ARP Fig 3 85 ARP Fig 3 86 ARP Fig 3 87 ARP...
Страница 118: ...112 Fig 3 88 IPv4 Fig 3 89 IPv4 Fig 3 90 IPv4...
Страница 119: ...113 Fig 3 91 IPv4 Fig 3 92 IPv4 Fig 3 93 IPv4 Fig 3 94 IPv4 Fig 3 95 IPv4...
Страница 120: ...114 Fig 3 96 IPv4 Fig 3 97 IPv4 Fig 3 98 IPv4 Fig 3 99 IPv4 Fig 3 100 IPv4...
Страница 121: ...115 Fig 3 101 IPv4 Fig 3 102 IPv4 Fig 3 103 IPv4...
Страница 122: ...116 Fig 3 104 IPv4 Fig 3 105 IPv4 Fig 3 106 IPv4...
Страница 123: ...117 Fig 3 107 IPv4 Fig 3 108 IPv4 Fig 3 109 IPv4...
Страница 124: ...118 Fig 3 110 IPv4 Fig 3 111 IPv4 Fig 3 112 IPv4...
Страница 125: ...119 Fig 3 113 IPv4 Fig 3 114 IPv4 Fig 3 115 IPv4...
Страница 126: ...120 Fig 3 116 IPv4 Fig 3 117 IPv4 Fig 3 118 Action...
Страница 127: ...121 Fig 3 119 Rate Limiter Fig 3 120 Port Copy...
Страница 128: ...122 Fig 3 121 DMAC Filter Fig 3 122 VLAN ID Filter Fig 3 123 VLAN ID Filter...
Страница 140: ...134 Fig 3 126 Set up Policy Rules Fig 3 127 Set up Policy Rules Fig 3 128 Set up Policy Rules...
Страница 141: ...135 Fig 3 129 Set up Policy Rules Finish Fig 3 130 Set up Port Policies Fig 3 131 Set up Port Policies...
Страница 196: ...190 Fig 3 170...
Страница 204: ...198 Fig 4 1 Fig 4 2 LGB1002A R2 LGB1002A R2 LGB1002A R2 LGB1002A R2...
Страница 255: ...249 MAC Address Alias 1 00 02 03 04 05 06 aaa 2 00 33 03 04 05 06 ccc 3 00 44 33 44 55 44 www...
Страница 258: ...252 6 Enable 6 Normal 7 Enable 7 Normal 8 Enable 8 Normal...
Страница 318: ......
