NETGEAR NMS100 manual Subnet Mask

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Reference Manual for the ProSafe Network Management System NMS1000

SSID

A Service Set Identification is a thirty-two character (maximum) alphanumeric key identifying a wireless local area network. For the wireless devices in a network to communicate with each other, all devices must be configured with the same SSID.

This is typically the configuration parameter for a wireless PC card. It corresponds to the ESSID in the wireless Access Point and to the wireless network name. See also Wireless Network Name and ESSID.

Subnet Mask

A mask used to determine what subnet an IP address belongs to. Subnetting enables a network administrator to further divide an IP address into two or more subnets.

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 the network 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. This is easier to see if we show the IP address in binary format. The full address 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, however, then the first 4 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, therefore, the subnet mask would be 11111111.11111111.11110000.00000000. It's 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 subnet address, therefore, is 150.215.016.000.

TCP/IP

The main internetworking protocols used in the Internet. The Internet Protocol (IP) used in conjunction with the Transfer Control Protocol (TCP) form TCP/IP.

TLS

Short for Transport Layer Security, TLS is a protocol that guarantees privacy and data integrity between client/server applications communicating over the Internet.

The TLS protocol is made up of two layers. The TLS Record Protocol ensures that a connection is private by using symmetric data encryption and ensures that the connection is reliable. The second TLS layer is the TLS Handshake Protocol, which allows authentication between the server and client and the negotiation of

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Glossary

September 2004 202-10036-01

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Contents September 2004 NETGEAR, IncStatement of Conditions TrademarksCustomer Support World Wide Web Contents Chapter Data and Statistics Appendix a Contents Typographical Conventions Audience, Scope, Conventions, and FormatsManual Scope Other ProSafe NMS Features OverviewDevice Access Modes ProSafe Network Management SystemSystem Requirements Recommended system requirementsPackage Contents Introduction Introduction Chapter Installation and Startup Installing the ProSafe NMS Server and Local ConsoleInstalling the Air Messenger Pro Paging Software Starting the ProSafe NMS Server and Local ConsoleStarting a Local Console Session Disabling Automatic Console LoginStopping and Starting the Server Console Elements Main button bar Edit button bar Selection ToolEvent Log Tool Element FunctionConsole Button Commands Zoom toSelection Tool Event Log ToolSelection Tool tabs Selection Tab DescriptionView Window Area Installation and Startup Working with the Map Database Map Selection TreeUsing Map View Windows View All Zoom OutZoom RectangleMoving Map Objects Moving Objects at the Root LevelMoving Objects Inside Subnet Levels Automatically arranged and manually arranged submap levelsMoving Objects from One Subnet to Another Changing Object Properties AttributesObject Properties Access tab Access ParametersAttribute Name Description Type-Dependent Attributes Object Properties Attribute tab Object Attribute Name Description Type aObject Types Adding Map ObjectsType Description MIB Selection Tree Viewing Device MIB DataManage Menus Table Display Elements Custom MenusGraph Display Elements Graph StylesSaving Long-term Statistics Creating a New ReportViewing Trend Data in a Graph Window Limiting Saved Instances Threshold Alarms Setting Threshold AlarmsAlarm Type Description Setting Status Variable Polling Configuring Automatic AlarmsSetting Manual Threshold Alarms Discovery of Four Built-in Services Polling TCP Application ServicesTCP Service Polling Custom TCP Service Polling Managing Polling for the DeviceEmailing or Paging the Administrator on an Event To modify an existing Custom TCP Service definitionThen, set the Email/Paging global event options Add an Event Filter for the pollDeviceDown event Then, set the Email/Page event actions ProSafe NMS Events Other Event TypesEvent Subtree Trap Name Description Emailing or Paging Multiple Users First, add a grouped set of usersThen, add an Event Filter for the selected devices Duration of Network Discovery Troubleshooting Network DiscoveryNormal Discovery Map Layout Failure Symptoms and Solutions Sample top-level and Subnet Map views for a small networkDiscovery Agent Fails to Connect to the Server Incorrect or Missing Community NamesFirewalls Block Snmp Operations Snmp Device Access Control ListNot Enough Seeds Broadcast Packet Losses Setting Up New FiltersLimiting the Scope of Discovery Stopping Discovery Auto-Layout Event Parameters Event ParametersEvent Description Parameters Set Community name of the target device List of Glossary Terms Auto Uplink Denial of Service attackCat Dynamic Host Configuration Protocol Domain Name DoSIP Address GatewayInternet Protocol Lightweight Directory Access Protocol Local area networkMAC address MbpsNetBIOS Network Address TranslationPacket Perfect Forward SecrecyPPPoE PPP over ATMPPP over Ethernet RouterSubnet Mask Wi-Fi Windows Internet Naming Service Universal Plug and PlayWEB Proxy Server Wide area networkWireless Network Name Ssid Index Index Index
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