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Terms

Burstiness

Data that is transferred or transmitted in short, uneven spurts. LAN traffic is typically bursty. Opposite of streaming data.

CA

Certificate Authority. Issues certificates to gateways, users, or computers, to identify itself to connecting entities with Distinguished Name, public key, and sometimes IP address. After certificate validation, entities can send encrypted data using the public keys in the certificates.

Certificate

An electronic document that uses a digital signature to bind a cryptographic public key to a specific identity. The identity can be an individual, organization, or software entity. The certificate is used to authenticate one identity to another.

Intelligent Queuing Engine

A bandwidth allocation algorithm that guarantees high priority traffic takes precedence over low priority traffic.

Interface

A boundary across which two systems communicate independently with each other.

Jitter

Variation in the delay of received packets. On the sending side, packets are spaced evenly apart and sent in a continuous stream. On the receiving side, the delay between each packet can vary according to network congestion, improper queuing or configuration errors.

Policy

A collection of rules that control network traffic and enforce organization guidelines for data protection and access to resources with packet inspection.

QoS

A policy-based bandwidth management solution.

QoS Action Properties

Properties that define bandwidth allocation, limits, and guarantees for a rule.

RDED

Retransmit Detect Early Drop. The bottleneck that results from the connection of a LAN to the WAN causes TCP to retransmit packets. RDED prevents inefficiencies by detecting retransmits in TCP streams and preventing the transmission of redundant packets when multiple copies of a packet are concurrently queued on the same flow.

Rule

A set of traffic parameters and other conditions that cause specified actions to be taken for a communication session.

Rule Base

The database that contains the rules in a security policy and defines the sequence, in which they are enforced.

WFQ

Weighted Fair Queuing. An algorithm to precisely control bandwidth allocation in QoS.

WFRED

Weighted Flow Random Early Drop. A mechanism for managing the packet buffers of QoS. Adjusting automatically and dynamically to the network traffic situation, WFRED remains transparent to the user.