Appendix A IP Addresses and Subnetting
VES-1616F-3x Series User’s Guide
287
Subnet masks are expressed in dotted decimal notation just like IP addresses. The following
examples show the binary and decimal notation for 8-bit, 16-bit, 24-bit and 29-bit subnet
masks.
Network Size
The size of the network number determines the maximum number of possible hosts you can
have on your network. The larger the number of network number bits, the smaller the number
of remaining host ID bits.
An IP address with host IDs of all zeros is the IP address of the network (192.168.1.0 with a
24-bit subnet mask, for example). An IP address with host IDs of all ones is the broadcast
address for that network (192.168.1.255 with a 24-bit subnet mask, for example).
As these two IP addresses cannot be used for individual hosts, calculate the maximum number
of possible hosts in a network as follows:
Notation
Since the mask is always a continuous number of ones beginning from the left, followed by a
continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the
number of ones instead of writing the value of each octet. This is usually specified by writing
a “/” followed by the number of bits in the mask after the address.
For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with subnet mask
255.255.255.128.
The following table shows some possible subnet masks using both notations.
Table 97
Subnet Masks
BINARY
DECIMAL
1ST
OCTET
2ND
OCTET
3RD
OCTET
4TH OCTET
8-bit mask
11111111
00000000
00000000
00000000
255.0.0.0
16-bit mask
11111111
11111111
00000000
00000000
255.255.0.0
24-bit mask
11111111
11111111
11111111
00000000
255.255.255.0
29-bit mask
11111111
11111111
11111111
11111000
255.255.255.248
Table 98
Maximum Host Numbers
SUBNET MASK
HOST ID SIZE
MAXIMUM NUMBER OF HOSTS
8 bits
255.0.0.0
24 bits
2
24
– 2
16777214
16 bits
255.255.0.0
16 bits
2
16
– 2
65534
24 bits
255.255.255.0
8 bits
2
8
– 2
254
29 bits
255.255.255.248 3 bits
2
3
– 2
6
Table 99
Alternative Subnet Mask Notation
SUBNET MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
255.255.255.0
/24
0000 0000
0
255.255.255.128
/25
1000 0000
128
Summary of Contents for VDSL SWITCH VES-1616F-3X
Page 1: ...www zyxel com VES 1616F 3x Series VDSL Switch User s Guide Version 3 60 5 2007 Edition 2 ...
Page 2: ......
Page 7: ...Safety Warnings VES 1616F 3x Series User s Guide 7 ...
Page 8: ...Safety Warnings VES 1616F 3x Series User s Guide 8 ...
Page 28: ...List of Tables VES 1616F 3x Series User s Guide 28 ...
Page 30: ...30 ...
Page 34: ...Chapter 1 Getting to Know Your Switch VES 1616F 3x Series User s Guide 34 ...
Page 42: ...Chapter 3 Hardware Overview VES 1616F 3x Series User s Guide 42 ...
Page 44: ...44 ...
Page 62: ...Chapter 5 System Status and Port Statistics VES 1616F 3x Series User s Guide 62 ...
Page 84: ...Chapter 6 Basic Setting VES 1616F 3x Series User s Guide 84 ...
Page 86: ...86 ...
Page 106: ...Chapter 10 Spanning Tree Protocol VES 1616F 3x Series User s Guide 106 ...
Page 120: ...Chapter 15 Port Authentication VES 1616F 3x Series User s Guide 120 ...
Page 126: ...Chapter 17 Queuing Method VES 1616F 3x Series User s Guide 126 ...
Page 131: ...Chapter 18 Classifier VES 1616F 3x Series User s Guide 131 Figure 51 Classifier Example ...
Page 132: ...Chapter 18 Classifier VES 1616F 3x Series User s Guide 132 ...
Page 138: ...Chapter 19 Policy VES 1616F 3x Series User s Guide 138 Figure 53 Policy Example ...
Page 144: ...Chapter 20 VLAN Stacking VES 1616F 3x Series User s Guide 144 ...
Page 156: ...Chapter 21 Multicast VES 1616F 3x Series User s Guide 156 ...
Page 160: ...Chapter 22 Differentiated Services VES 1616F 3x Series User s Guide 160 ...
Page 161: ...161 PART IV Routing Protocol Static Route 163 DHCP Relay 165 ...
Page 162: ...162 ...
Page 168: ...168 ...
Page 178: ...Chapter 25 Maintenance VES 1616F 3x Series User s Guide 178 ...
Page 192: ...Chapter 27 Diagnostic VES 1616F 3x Series User s Guide 192 ...
Page 196: ...Chapter 28 Syslog VES 1616F 3x Series User s Guide 196 ...
Page 202: ...Chapter 29 Cluster Management VES 1616F 3x Series User s Guide 202 ...
Page 208: ...208 ...
Page 242: ...Chapter 32 Introducing the Commands VES 1616F 3x Series User s Guide 242 ...
Page 266: ...Chapter 34 IEEE 802 1Q Tagged VLAN Commands VES 1616F 3x Series User s Guide 266 ...
Page 274: ...Chapter 35 Troubleshooting VES 1616F 3x Series User s Guide 274 ...
Page 282: ...Chapter 36 Product Specifications VES 1616F 3x Series User s Guide 282 ...
Page 284: ...284 ...
Page 298: ...Appendix B Legal Information VES 1616F 3x Series User s Guide 298 ...