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162 GLOSSARY
proxy cache The Webcache is connected to a Layer 2 switch in your LAN. The Web
browser on each client machine in your network must be configured to
explicitly direct its Web requests to the Webcache.
router A router is a device on your network which is used to forward IP
packets to a remote destination. An alternative name for a router is a
gateway.
server A computer in a network that holds the master version of a web
page/object. A web request that is not served by the Webcache must
go to the server across the World Wide Web. This is termed a cache
miss. A web request served by the Webcache is termed a cache hit.
SNMP Simple Network Management Protocol. The current IETF standard
protocol for managing devices on an TCP/IP network.
subnet An IP network can be divided into sub-networks, also known as
subnets. If you have a small network (less than 254 devices), you may
decide not to have multiple subnets.
subnet mask A subnet mask is used to divide the device part of the IP address into two
further parts. The first part identifies the subnet number. The second part
identifies the device on that subnet.
TCP/IP Transmission Control Protocol/Internet Protocol. This is the name for
two of the most well-known protocols developed for the
interconnection of networks. Originally a UNIX standard, TCP/IP is now
supported on almost all platforms, and is the protocol of the Internet.
TCP relates to the content of the data travelling through a network —
ensuring that the information sent arrives in one piece when it reaches
its destination. IP relates to the address of the client machine to which
data is being sent, as well as the address of the destination network.
Telne t A TCP/IP application protocol that provides a virtual terminal service,
letting a user log into another computer system and access a device as
if the user were connected directly to the device.
trace route This feature allows you to display the network hops from the
Webcache to a device on an IP network.
transparent cache The Webcache is connected to a Layer 4 device in your LAN which is
capable of Redirection. The Layer 4 switch (also known as a Layer 4
redirector or Web enabled switch) automatically redirects all Web
requests to the Webcache.