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GL-1
Cisco 10000 Series Router Service Selection Gateway Configuration Guide
OL-4387-02
GLOSSARY
A
authentication
A security feature that allows access to information to be granted on an individual basis.
B
bandwidth
The range of frequencies a transmission line or channel can carry. The greater the bandwidth, the
greater the information-carrying capacity of a channel. For a digital channel this is defined in bits. For
an analog channel it is dependent on the type and method of modulation used to encode the data.
broadcast
A packet delivery system where a copy of a given packet is given to all hosts attached to the network.
For example: Ethernet.
C
captive portal
A server that is programmed to respond to redirected packets. Captive portals enable service providers
to capture a subscriber’s attention with targeted messages such as authentication, requests for
per-service payment, and blocked access to a particular service. A captive portal group consists of one
or more servers. A captive portal group is identified by its unique name. Each server in a captive portal
group is identified by its IP address and TCP port. SSG selects one server from the group in a
round-robin fashion to receive the redirected packets. Servers can be in the SSG Open Garden or default
network.
CEF
Cisco Express Forwarding. An advanced Layer 3 IP switching technology. CEF optimizes network
performance and scalability for networks with large and dynamic traffic patterns such as the Internet,
on networks characterized by intensive Web-based applications, or interactive sessions.
D
DSL
Digital Subscriber Line.