time voice. Networks must provide secure, predictable, measurable, and sometimes guaranteed
services. Achieving the required QoS becomes the secret to a successful end-to-end business solution.
RADIUS
RADIUS is a client/server protocol and software that enables remote access servers to communicate
with a central server to authenticate dial-in users and authorize their access to the requested system or
service. RADIUS allows a company to maintain user profiles in a central database that all remote servers
can share. It provides better security, allowing a company to set up a policy that can be applied at a
single administered network point. With RADIUS, you can track usage for billing and for keeping
network statistics.
SNMP
Simple Network Management Protocol is a standard that uses a common software agent to remotely
monitor and set network configuration and runtime parameters. SNMP operates in a multivendor
environment, and the agent uses MIBs, which define what information is available from any manageable
network device. You can also set traps using SNMP, which send notifications of network events to the
system log.
SNTP
Simple Network Time Protocol is used to synchronize the system clocks throughout the network. An
extension of NTP, SNTP can usually operate with a single server and allows for IPv6 addressing.
SSL
Secure Socket Layer is a protocol for transmitting private documents using the Internet. SSL works by
using a public key to encrypt data that is transferred over the SSL connection. SSL uses the public-and-
private key encryption system, which includes the use of a digital certificate.
syslog
A protocol used for the transmission of event notification messages across networks, originally
developed on the University of California Berkeley Software Distribution (BSD) TCP/IP system
implementations, and now embedded in many other operating systems and networked devices. A
device generates a messages, a relay receives and forwards the messages, and a collector (a syslog
server) receives the messages without relaying them.
syslog uses the UDP as its underlying transport layer mechanism. The UDP port that has been assigned
to syslog is 514. (RFC 3164)
VLAN
The term VLAN is used to refer to a collection of devices that communicate as if they are on the same
physical LAN. Any set of ports (including all ports on the switch) is considered a VLAN. LAN segments
are not restricted by the hardware that physically connects them. The segments are defined by flexible
user groups you create with the CLI.
Glossary
