Appliance Trim Kit User Manual

Appendix A: Glossary
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non-cacheable objects A number of objects are not cached by the Blue Coat appliance because they are
considered non-cacheable. You can add or delete the kinds of objects that the
appliance considers non-cacheable. Some of the non-cacheable request types are:
• Pragma no-cache, requests that specify non-cached objects, such as when you click
refresh in the Web browser.
• Password provided, requests that include a client password.
• Data in request that include additional client data.
• Not a GET request.
.nsc file Created from the multicast station definition and saved through the browser as a text
file encoded in a Microsoft proprietary format. Without an .nsc file, the multicast
station definition does not work.
NTP To manage objects in an appliance, an SG appliance must know the current Universal
Time Coordinates (UTC) time. By default, the SG appliance attempts to connect to a
Network Time Protocol (NTP) server to acquire the UTC time. SG appliance includes
a list of NTP servers available on the Internet, and attempts to connect to them in the
order they appear in the NTP server list on the NTP tab.
O
object (used in caching) An object is the item that is stored in an appliance. These objects can be frequently
accessed content, content that has been placed there by content publishers, or Web
pages, among other things.
object (used in Visual Policy
Manager)
An object (sometimes referred to as a condition) is any collection or combination of
entry types you can create individually (user, group, IP address/subnet, and
attribute). To be included in an object, an item must already be created as an
individual entry.
object pipelining This patented algorithm opens as many simultaneous TCP connections as the origin
server will allow and retrieves objects in parallel. The objects are then delivered from
the appliance straight to the user's desktop as fast as the browser can request them.
origin content server (OCS) Also called origin server. This is the original source of the content that is being
requested. An appliance needs the OCS to acquire data the first time, to check that
the content being served is still fresh, and to authenticate users.
outbound traffic (bandwidth
gain)
Network packets flowing out of the SG appliance. Outbound traffic mainly consists
of the following:
• Client outbound: Packets sent to the client in response to a Web request.
• Server outbound: Packets sent to an OCS or upstream proxy to request a service.
P
PAC (Proxy
AutoConfiguration) scripts
Originally created by Netscape, PACs are a way to avoid requiring proxy hosts and
port numbers to be entered for every protocol. You need only enter the URL. A PAC
can be created with the needed information and the local browser can be directed to
the PAC for information about proxy hosts and port numbers.
packet capture (PCAP) Allows filtering on various attributes of the Ethernet frame to limit the amount of
data collected. You can capture packets of Ethernet frames going into or leaving an
SG appliance.