Vantage CNM 2.0 User’s Guide
270
Appendix E
IP Subnetting
IP Addressing
Routers “route” based on the network number. The router that delivers the data packet to the
correct destination host uses the host ID.
IP Classes
An IP address is made up of four octets (eight bits), written in dotted decimal notation, for
example, 192.168.1.1. IP addresses are categorized into different classes. The class of an
address depends on the value of its first octet.
• Class “A” addresses have a 0 in the left most bit. In a class “A” address the first octet is
the network number and the remaining three octets make up the host ID.
• Class “B” addresses have a 1 in the left most bit and a 0 in the next left most bit. In a class
“B” address the first two octets make up the network number and the two remaining
octets make up the host ID.
• Class “C” addresses begin (starting from the left) with 1 1 0. In a class “C” address the
first three octets make up the network number and the last octet is the host ID.
• Class “D” addresses begin with 1 1 1 0. Class “D” addresses are used for multicasting.
(There is also a class “E” address. It is reserved for future use.)
Therefore:
A class “C” network (8 host bits) can have 2
8
–2 or 254 hosts.
A class “B” address (16 host bits) can have 2
16
–2 or 65534 hosts.
A class “A” address (24 host bits) can have 2
24
–2 hosts (approximately 16 million hosts).
Table 117 Classes of IP Addresses
IP ADDRESS:
OCTET 1
OCTET 2
OCTET 3
OCTET 4
Class A
0
Network number
Host ID
Host ID
Host ID
Class B
10
Network number
Network number
Host ID
Host ID
Class C
110
Network number
Network number
Network number
Host ID
Note: Host IDs of all zeros or all ones are not allowed.
Содержание VANTAGE CNM 2.0 -
Страница 30: ...Vantage CNM 2 0 User s Guide 33 Chapter 1 Introducing Vantage ...
Страница 40: ...Vantage CNM 2 0 User s Guide 43 Chapter 2 GUI Introduction ...
Страница 66: ...Vantage CNM 2 0 User s Guide 69 Chapter 4 Configuration Select Device BB General ...
Страница 78: ...Vantage CNM 2 0 User s Guide 81 Chapter 5 Configuration LAN ...
Страница 96: ...Vantage CNM 2 0 User s Guide 99 Chapter 7 Configuration DMZ ...
Страница 126: ...Vantage CNM 2 0 User s Guide 129 Chapter 8 Configuration WAN ...
Страница 140: ...Vantage CNM 2 0 User s Guide 143 Chapter 9 Configuration NAT ...
Страница 144: ...Vantage CNM 2 0 User s Guide 147 Chapter 10 Configuration Static Route ...
Страница 162: ...Vantage CNM 2 0 User s Guide 165 Chapter 11 Configuration VPN ...
Страница 182: ...Vantage CNM 2 0 User s Guide 185 Chapter 12 Configuration Firewall ...
Страница 188: ...Vantage CNM 2 0 User s Guide 191 Chapter 13 Configuration Device Log ...
Страница 236: ...Vantage CNM 2 0 User s Guide 239 Chapter 18 Other System Screens ...
Страница 239: ...Vantage CNM 2 0 User s Guide Chapter 19 Monitor Alarms 242 Figure 132 Monitor Current Alarms ...
Страница 242: ...Vantage CNM 2 0 User s Guide 245 Chapter 19 Monitor Alarms ...
Страница 248: ...Vantage CNM 2 0 User s Guide 251 Chapter 20 Other Monitor Screens ...
Страница 254: ...Vantage CNM 2 0 User s Guide 257 Figure 151 WFTPD Pro Log On ...
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Страница 286: ...Vantage CNM 2 0 User s Guide 289 ...
Страница 288: ...Vantage CNM 2 0 User s Guide 291 ...
Страница 291: ...Vantage CNM 2 0 User s Guide 294 Figure 181 ESS Provides Campus Wide Coverage ...
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