326 APPENDIX : GLOSSARY
Routing Information
Protocol (RIP)
The RIP protocol seeks to find the shortest route to another device by
minimizing the distance-vector, or hop count, which serves as a rough
estimate of transmission cost. RIP-2 is a compatible upgrade to RIP. It
adds useful capabilities for subnet routing, authentication, and
multicast transmissions.
Simple Mail Transfer
Protocol (SMTP)
A standard host-to-host mail transport protocol that operates over TCP,
port 25.
Simple Network
Management
Protocol (SNMP)
The application protocol in the Internet suite of protocols which offers
network management services.
Simple Network Time
Protocol (SNTP)
SNTP allows a device to set its internal clock based on periodic updates
from a Network Time Protocol (NTP) server. Updates can be requested
from a specific NTP server, or can be received via broadcasts sent by
NTP servers.
Spanning Tree
Protocol (STP)
A technology that checks your network for any loops. A loop can often
occur in complicated or backup linked network systems. Spanning Tree
detects and directs data along the shortest available path, maximizing
the performance and efficiency of the network.
Telne t Defines a remote communication facility for interfacing to a terminal
device over TCP/IP.
Protocol-Independent
Multicasting (PIM)
This multicast routing protocol floods multicast traffic downstream, and
calculates the shortest-path back to the multicast source network via
reverse path forwarding. PIM uses the router’s IP routing table rather
than maintaining a separate multicast routing table as with DVMRP.
PIM - Sparse Mode is designed for networks where the probability of a
multicast client is low, such as on a Wide Area Network. PIM - Dense
Mode is designed for networks where the probability of a multicast
client is high and frequent flooding of multicast traffic can be justified.
Terminal Access
Controller Access
Control System Plus
(TACACS+)
TACACS+ is a logon authentication protocol that uses software running
on a central server to control access to TACACS-compliant devices on
the network.
Transmission Control Protocol/Internet Protocol (TCP/IP)
Protocol suite that includes TCP as the primary transport protocol, and
IP as the network layer protocol.
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