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Appendix B IP Addresses and Subnetting
ES-1528 User’s Guide
155
Figure 97
Subnetting Example: After Subnetting
In a 25-bit subnet the host ID has 7 bits, so each sub-network has a maximum of 2
7
– 2 or 126
possible hosts (a host ID of all zeroes is the subnet’s address itself, all ones is the subnet’s
broadcast address).
192.168.1.0 with mask 255.255.255.128 is subnet
A
itself, and 192.168.1.127 with mask
255.255.255.128 is its broadcast address. Therefore, the lowest IP address that can be assigned
to an actual host for subnet
A
is 192.168.1.1 and the highest is 192.168.1.126.
Similarly, the host ID range for subnet
B
is 192.168.1.129 to 192.168.1.254.
Example: Four Subnets
The previous example illustrated using a 25-bit subnet mask to divide a 24-bit address into two
subnets. Similarly, to divide a 24-bit address into four subnets, you need to “borrow” two host
ID bits to give four possible combinations (00, 01, 10 and 11). The subnet mask is 26 bits
(11111111.11111111.11111111.
11
000000) or 255.255.255.192.
Each subnet contains 6 host ID bits, giving 2
6
- 2 or 62 hosts for each subnet (a host ID of all
zeroes is the subnet itself, all ones is the subnet’s broadcast address).
Table 78
Subnet 1
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address (Decimal)
192.168.1.
0
IP Address (Binary)
11000000.10101000.00000001.
00
000000
Subnet Mask (Binary)
11111111.11111111.11111111.
11
000000
Subnet Address:
192.168.1.0
Lowest Host ID: 192.168.1.1
Broadcast Address:
192.168.1.63
Highest Host ID: 192.168.1.62
Содержание ES-1528 - V1.12
Страница 1: ...www zyxel com ES 1528 Ethernet Switch User s Guide Version 1 12 10 2006 Edition 1...
Страница 2: ......
Страница 7: ...Safety Warnings ES 1528 User s Guide 7 This product is recyclable Dispose of it properly...
Страница 8: ...Safety Warnings ES 1528 User s Guide 8...
Страница 10: ...Contents Overview ES 1528 User s Guide 10...
Страница 20: ...List of Figures ES 1528 User s Guide 20...
Страница 24: ...List of Tables ES 1528 User s Guide 24...
Страница 26: ...26...
Страница 30: ...Chapter 1 Getting to Know Your Switch ES 1528 User s Guide 30...
Страница 34: ...Chapter 2 Hardware Installation and Connection ES 1528 User s Guide 34...
Страница 40: ...Chapter 3 Hardware Overview ES 1528 User s Guide 40...
Страница 42: ...42...
Страница 54: ...Chapter 5 System ES 1528 User s Guide 54...
Страница 58: ...Chapter 6 Port Settings ES 1528 User s Guide 58...
Страница 70: ...Chapter 10 Mirroring ES 1528 User s Guide 70...
Страница 86: ...Chapter 13 Level 2 L2 Management ES 1528 User s Guide 86...
Страница 88: ...Chapter 14 Cable Diagnostics ES 1528 User s Guide 88...
Страница 92: ...Chapter 15 Auto Denial of Service DoS ES 1528 User s Guide 92...
Страница 96: ...96...
Страница 101: ...Chapter 17 Event Logging ES 1528 User s Guide 101 Figure 55 Searching RAM Flash Logs...
Страница 104: ...Chapter 17 Event Logging ES 1528 User s Guide 104...
Страница 118: ...Chapter 18 SNMP ES 1528 User s Guide 118...
Страница 132: ...Chapter 19 RMON Lite ES 1528 User s Guide 132...
Страница 144: ...Chapter 21 Troubleshooting ES 1528 User s Guide 144...
Страница 146: ...146...
Страница 150: ...Appendix A Product Specifications ES 1528 User s Guide 150...
Страница 162: ...Appendix C Legal Information ES 1528 User s Guide 162...