Glossary
169
Glossary
SRQ
Service Request. An asynchronous request (an interrupt) from a remote
device indicating that the device requires servicing.
Subnet
A portion of a network that shares a common address component.
On TCP/IP networks, subnets are defined as all devices whose IP
addresses have the same prefix. For example, all devices with IP
addresses that start with 100.100.100. would be part of the same
subnet. Dividing a network into subnets is useful for both security and
performance reasons. IP networks are divided using a subnet mask.
Subnet Mask
A mask used to determine to what subnet an IP address belongs. An IP
address has two components: the network address and the host
address. For example, consider the IP address 150.215.017.009.
Assuming this is part of a Class B network, the first two numbers
(150.215) represent the Class B network address and the second two
numbers (017.009) identify a particular host on this network.
Subnetting enables a System Administrator to further divide the host
part of the address into two or more subnets. In this case, a part of the
host address is reserved to identify the particular subnet.
For example, the full address for 150.215.017.009 is
10010110.11010111.00010001.00001001. The Class B network part is
10010110.11010111 and the host address is 00010001.00001001. If this
network is divided into 14 subnets, the first four bits of the host address
(0001) are reserved for identifying the subnet.
The subnet mask is the network address plus the bits reserved for
identifying the subnetwork. (By convention, the bits for the network
address are all set to 1, though it would also work if the bits were set
exactly as in the network address.) In this case, the subnet mask is
11111111.11111111.11110000.00000000.
It is called a mask because it can be used to identify the subnet to which
an IP address belongs by performing a bitwise AND operation on the
mask and the IP address. The result is the subnetwork address:
Subnet Mask 255.255.240.000
11111111.11111111.11110000.00000000
IP Address 150.215.017.009
10010110.11010111.00010001.00001001
Subnet Address 150.215.016.000 10010110.11010111.00010000.00000000
The default subnet mask for the E5810 is 255.255.0.0
Summary of Contents for Agilent E5810A
Page 1: ...Agilent E5810A LAN GPIB Gateway for Windows User s Guide ...
Page 2: ......
Page 6: ...Contents 6 ...
Page 15: ...1 E5810 Description ...
Page 33: ...2 Installing the E5810 ...
Page 75: ...3 Using E5810 Web Access ...
Page 85: ...Chapter 3 85 Using E5810 Web Access Viewing and Modifying Configuration ...
Page 108: ...108 Chapter 3 Using E5810 Web Access Other Web Access Functions ...
Page 109: ...4 Troubleshooting Information ...
Page 131: ...A E5810 Specifications ...
Page 136: ...136 AppendixA E5810 Specifications Supported Network Protocols Notes ...
Page 137: ...B Using the Agilent IO Libraries ...
Page 152: ...152 Appendix B Using the Agilent IO Libraries Installing Custom Agilent IO Libraries Notes ...
Page 153: ...C Using the Telnet Utility ...
Page 160: ...160 Appendix C Using the Telnet Utility Telnet Commands for the E5810 Notes ...
Page 161: ...161 Glossary ...
Page 172: ...172 Glossary Glossary Notes ...
Page 176: ...176 Index ...
