240
Appendix G IP subnetting
N0115789
is a summary for class C subnet planning.
Subnetting with Class A and Class B networks.
For class A and class B addresses the subnet mask also determines which bits are
part of the network number and which are part of the host ID.
A class B address has two host ID octets available for subnetting and a class A
address has three host ID octets (see
is a summary for class B subnet planning.
7
192
193
222
223
8
224
225
254
255
Table 59
Class C subnet planning
No. Borrowed Host Bits
Subnet Mask
No. Subnets
No. Hosts per Subnet
1
255.255.255.128 (/25)
2
126
2
255.255.255.192 (/26)
4
62
3
255.255.255.224 (/27)
8
30
4
255.255.255.240 (/28)
16
14
5
255.255.255.248 (/29)
32
6
6
255.255.255.252 (/30)
64
2
7
255.255.255.254 (/31)
128
1
Table 60
Class B subnet planning
No. “Borrowed” Host Bits
Subnet Mask
No. Subnets
No. Hosts per Subnet
1
255.255.128.0 (/17)
2
32 766
2
255.255.192.0 (/18)
4
16 382
3
255.255.224.0 (/19)
8
8 190
4
255.255.240.0 (/20)
16
4 094
Table 58
Eight subnets
Subnet
Subnet Address
First Address
Last Address
Broadcast Address
Содержание BCM50e
Страница 18: ...18 Figures N0115789 ...
Страница 22: ...22 Tables N0115789 ...
Страница 28: ...28 Preface N0115789 ...
Страница 38: ...38 Chapter 1 Getting to know your BCM50e Integrated Router N0115789 ...
Страница 44: ...44 Chapter 2 Introducing the SMT N0115789 SMT menus at a glance Figure 6 SMT overview ...
Страница 60: ...60 Chapter 4 LAN setup N0115789 ...
Страница 82: ...82 Chapter 6 Remote Node setup N0115789 ...
Страница 86: ...86 Chapter 7 IP Static Route Setup N0115789 ...
Страница 114: ...114 Chapter 9 Network Address Translation NAT N0115789 ...
Страница 136: ...136 Chapter 11 Filter configuration N0115789 ...
Страница 140: ...140 Chapter 12 SNMP Configuration N0115789 ...
Страница 144: ...144 Chapter 13 System security N0115789 ...
Страница 172: ...172 Chapter 15 Firmware and configuration file maintenance N0115789 ...
Страница 186: ...186 Chapter 17 Remote Management N0115789 ...
Страница 206: ...206 Appendix B Triangle Route N0115789 ...
Страница 226: ...226 Appendix D PPPoE N0115789 ...
Страница 232: ...232 Appendix F N0115789 ...
Страница 242: ...242 Appendix G IP subnetting N0115789 ...
Страница 304: ...304 Appendix K Log descriptions N0115789 ...
Страница 306: ...306 Appendix L Brute force password guessing protection N0115789 ...