264
Appendix F IP subnetting
NN47923-501
Table 62
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
Table 51
) available for subnetting.
Table 63
is a summary for class B subnet planning.
7
192
193
222
223
8
224
225
254
255
Table 62
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 63
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 61
Eight subnets
Subnet
Subnet Address
First Address
Last Address
Broadcast Address
Содержание 252
Страница 13: ...Contents 13 Nortel Business Secure Router 252 Configuration Advanced SIP Register Server 337 RTP 337 Index 341 ...
Страница 14: ...14 Contents NN47923 501 ...
Страница 20: ...20 Figures NN47923 501 ...
Страница 24: ...24 Tables NN47923 501 ...
Страница 30: ...30 Preface NN47923 501 ...
Страница 42: ...42 Chapter 1 Getting to know your Nortel Business Secure Router 252 NN47923 501 ...
Страница 48: ...48 Chapter 2 Introducing the SMT NN47923 501 SMT menus at a glance Figure 6 SMT overview ...
Страница 72: ...72 Chapter 3 WAN and Dial Backup Setup NN47923 501 ...
Страница 80: ...80 Chapter 4 LAN setup NN47923 501 ...
Страница 84: ...84 Chapter 5 Internet access NN47923 501 ...
Страница 98: ...98 Chapter 6 Remote Node setup NN47923 501 ...
Страница 102: ...102 Chapter 7 IP Static Route Setup NN47923 501 ...
Страница 130: ...130 Chapter 9 Network Address Translation NAT NN47923 501 ...
Страница 156: ...156 Chapter 12 SNMP Configuration NN47923 501 ...
Страница 178: ...178 Chapter 14 System information and diagnosis NN47923 501 ...
Страница 198: ...198 Chapter 15 Firmware and configuration file maintenance NN47923 501 ...
Страница 212: ...212 Chapter 17 Remote Management NN47923 501 ...
Страница 232: ...232 Appendix B Triangle Route NN47923 501 ...
Страница 252: ...252 Appendix D PPPoE NN47923 501 ...
Страница 256: ...256 Appendix E Hardware specifications NN47923 501 ...
Страница 266: ...266 Appendix F IP subnetting NN47923 501 ...
Страница 308: ...308 Appendix H NetBIOS filter commands NN47923 501 ...
Страница 332: ...332 Appendix K Brute force password guessing protection NN47923 501 ...