Blue Coat Systems Blue Coat Systems SG Appliance, SGOS Version 5.2.2 manual Appendix a Glossary

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Appendix A: Glossary

cache efficiency

A tab found on the Statistics pages of the Management Console that shows the

 

percent of objects served from cache, the percent loaded from the network, and the

 

percent that were non-cacheable.

cache hit

Occurs when the SG appliance receives a request for an object and can serve the

 

request from the cache without a trip to the origin server.

cache miss

Occurs when the appliance receives a request for an object that is not in the cache.

 

The appliance must then fetch the requested object from the origin server. .

cache object

Cache contents includes all objects currently stored by the SG appliance. Cache

 

objects are not cleared when the SG appliance is powered off.

Certificate Authority (CA)

A trusted, third-party organization or company that issues digital certificates used to

 

create digital signatures and public key/private key pairs. The role of the CA is to

 

guarantee that the individuals or company representatives who are granted a unique

 

certificate are who they claim to be.

child class (bandwidth gain)

The child of a parent class is dependent upon that parent class for available

 

bandwidth (they share the bandwidth in proportion to their minimum/maximum

 

bandwidth values and priority levels). A child class with siblings (classes with the

 

same parent class) shares bandwidth with those siblings in the same manner.

client consent certificates

A certificate that indicates acceptance or denial of consent to decrypt an end user's

 

HTTPS request.

client-side transparency

A way of replacing the appliance IP address with the Web server IP address for all

 

port 80 traffic destined to go to the client. This effectively conceals the SG appliance

 

address from the client and conceals the identity of the client from the Web server.

concentrator

An SG appliance, usually located in a data center, that provides access to data center

 

resources, such as file servers.

content filtering

A way of controlling which content is delivered to certain users. SG appliances can

 

filter content based on content categories (such as gambling, games, and so on), type

 

(such as http, ftp, streaming, and mime type), identity (user, group, network), or

 

network conditions. You can filter content using vendor-based filtering or by

 

allowing or denying access to URLs.

D

 

default boot system

The system that was successfully started last time. If a system fails to boot, the next

 

most recent system that booted successfully becomes the default boot system.

default proxy listener

See proxy service (d efault).

denial of service (DoS)

A method that hackers use to prevent or deny legitimate users access to a computer,

 

such as a Web server. DoS attacks typically send many request packets to a targeted

 

Internet server, flooding the server's resources and making the system unusable. Any

 

system connected to the Internet and equipped with TCP-based network services is

 

vulnerable to a DoS attack.

 

The SG appliance resists DoS attacks launched by many common DoS tools. With a

 

hardened TCP/IP stack, SG appliance resists common network attacks, including

 

traffic flooding.

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Contents Blue Coat Systems SG Appliance Contact Information Contents Diagnostics Appendix a Glossary Index Volume 9 Managing the Blue Coat SG Appliance Document Conventions About Managing the SG ApplianceVolume 9 Managing the Blue Coat SG Appliance Automatically Registering the SG Appliance with Director Using Director to Manage SG SystemsDirector Registration Requirements Related CLI Commands for Director RegistrationRegistering the SG Appliance with Director To register the appliance with a DirectorTo view the fingerprint of the key Setting up Director and SG Appliance CommunicationSystem Summary Monitoring the System and DisksTo delete a key To view the system summary statisticsTo view the system environment statistics Viewing System Environment SensorsTo view disk status or take a disk offline Viewing Disk StatusConfiguring Which Events to Log Setting Up Event Logging and NotificationViewing SSL Accelerator Card Information To view SSL accelerator cardsRelated CLI Commands for Setting the Event Logging Level Setting Event Log SizeRelated CLI Commands to Set the Event Log Size Enabling Event NotificationTo enable event notifications Related CLI Commands to Enable Event NotificationsSyslog Event Monitoring Viewing the Event Log Configuration Viewing Event Log Configuration and ContentTo enable syslog monitoring Related CLI Commands to Enable Syslog MonitoringViewing the Event Log Contents To enable and configure Snmp Configuring SnmpRelated CLI Commands to Enable and Configure Snmp Enabling SnmpTo set or change community strings Configuring Snmp Community StringsConfiguring Snmp Traps To enable Snmp trapsRelated CLI Commands for Enabling Snmp Traps Health Monitoring Requirements Configuring Health MonitoringAbout Health Monitoring About the Health Monitoring Metric TypesAbout License Expiration Metrics Health Monitoring ExampleAbout Health Monitoring Notification About the General MetricsAbout the Licensing Metrics Metric Threshold States and Corresponding Values About the Status MetricsTo change the threshold and notification properties Changing Threshold and Notification PropertiesGetting a Quick View of the SG Appliance Health To review the health monitoring statistics Viewing Health Monitoring StatisticsRelated CLI Syntax to View Health Monitoring Statistics TroubleshootingVolume 9 Managing the Blue Coat SG Appliance Restarting the SG Appliance Hardware and Software Restart OptionsTo restart the SG appliance Restore-Defaults Restoring System DefaultsKeep-Console Factory-DefaultsClearing the DNS Cache To restore system defaultsClearing the Object Cache To clear the DNS cacheClearing the Byte Cache Troubleshooting TipClearing Trend Statistics Upgrading the SG ApplianceTo upgrade the SG appliance SG Appliance 5.x Version UpgradeRelated CLI Syntax to Upgrade the Sgos Software To view Sgos system replacement options Managing SG Appliance SystemsTo view details for an Sgos system version Setting the Default Boot System Example SessionTo set the SG appliance to run on the next hardware restart Replacing an SG Appliance System Locking and Unlocking SG Appliance SystemsTo lock a system To unlock a systemDisk Reinitialization Deleting an SG Appliance SystemMulti-Disk SG Appliances To delete a systemDeleting Objects from the SG Appliance Single-Disk SG ApplianceTo delete a single object from the SG appliance To delete multiple objects from the SG applianceDiagnostics Diagnostic Reporting Service Information Sending Service Information AutomaticallyTo send service information automatically Managing the Bandwidth for Service Information Related CLI Syntax to Send Service InformationTo manage bandwidth for service information To send service information Configure Service Information SettingsSGOS#diagnostics service-info subcommands Creating and Editing Snapshot Jobs To create a new snapshot jobTo edit an existing snapshot job Related CLI Syntax to Edit an Existing Snapshot Job Following subcommands are availablePacket Capturing the Job Utility Pcap File Name FormatCommon Pcap Filter Expressions Using Filter Expressions in the CLI Configuring Packet CapturingTo enable, stop, and download packet captures Diagnostics Viewing Current Packet Capture Data Related CLI Syntax to Define Packet Capturing SettingsCore Image Restart Options To configure core image restart optionsUploading Packet Capture Data To view current packet capture statisticsDiagnostic Reporting Heartbeats To set daily heartbeats and/or Blue Coat monitoringRelated CLI Syntax to Manage Heartbeats and Monitoring Diagnostic Reporting CPU Monitoring To configure and view CPU monitoringRelated CLI Syntax to Configure and View CPU Monitoring Volume 9 Managing the Blue Coat SG Appliance Selecting the Graph Scale StatisticsTraffic Mix Viewing Traffic Distribution StatisticsUnderstanding Chart Data Refreshing the DataAbout Bypassed Bytes About the Default Service Statistics Viewing Bandwidth Usage or GainTo view bandwidth usage or gain statistics Viewing Client Byte and Server Byte Traffic Distribution Viewing Traffic HistoryTo view client and server byte statistics Supported Proxy Types and Services Unsupported Proxy Types Viewing Bandwidth Management Statistics Viewing the ADN HistoryViewing Protocol Statistics To view client and server byte or bandwidth gain statisticsSSL History Resources Statistics Viewing System StatisticsViewing CPU Utilization To view CPU utilizationTo view concurrent users Viewing Concurrent UsersViewing Memory Use Statistics Viewing Disk Use StatisticsTo view disk use statistics To view memory use statisticsTo view data allocation statistics Viewing Data Allocation Statistics in RAM and on DiskContents Statistics To view the event log Event Logging StatisticsFailover Statistics Active Sessions-Viewing Per-Connection StatisticsTo view failover statistics Viewing Proxied Sessions Analyzing Proxied SessionsAbout the Proxied Sessions Statistics To view proxied sessionsProvided. See Viewing Sessions with Multiple Connections on Cache Hit Is unavailable if the content is non-cacheable or for Cifs Using the Tool Tips About MMS Streaming ConnectionsViewing Sessions with Multiple Connections MMS Understanding the Tree ViewWhat Is Not Displayed Filtering the DisplayAbout the Byte Totals Analyzing Bypassed Connections Statistics Viewing Html and XML Views of Proxied Sessions DataViewing Bypassed Connections About the Bypassed Connection StatisticsTo view bypassed connections 14. Filter Drop-Down List Viewing Html and XML Views of Bypassed Connections Data Viewing the Access LogViewing Health Monitoring Statistics Viewing Health Check StatisticsUsing the CLI show Command to View Statistics Statistics Volume 9 Managing the Blue Coat SG Appliance Appendix a Glossary URL Appendix a Glossary Drtr Icmp Volume 9 Managing the Blue Coat SG Appliance MACH5 MIB NTP 100 Network Tunneling tab 102 103 104 Index 106 Snmp 108