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Glossary

jitter

Measure of the difference in packet delay, that is, the difference in the space between packet arrival times. Jitter can be remedied somewhat with a jitter buffer.

journaling

A file system that keeps track of changes not yet committed to the file system’s main part by recording the intentions of such changes in a data structure known as a “journal”. In the event of a system crash or power failure, such file systems can be brought back online quicker with lower likelihood of becoming corrupted.

JSON
  • Also known as: JavaScript Object Notation

An open, text-based data exchange format (like XML), that is human-readable and platform-independent. Data formatted according to the JSON standard is lightweight and can be parsed by JavaScript implementations.

kb

A kilobit.

Kerberos

A network authentication protocol, designed to provide strong authentication for client/server applications by using secret-key cryptography. Available for free from the Massachusetts Institute of Technology, also available in commercial products.

Kerio connect

Messaging and collaboration product with functionality across platforms.

KVM
  • Also known as: Kernel-Based Virtual Machine

A virtualization infrastructure for the Linux kernel that turns it into a hypervisor. KVM requires a processor with hardware virtualization extension.

L2TP
  • Also known as: Layer 2 Tunneling Protocol

A network protocol that supports tunneling of layer 2 frames between two networks over the Internet.

latency

Delay in transmission time that occurs while information remains in a device's buffered memory (such as a bridge or router) before it can be sent along its path.

Launch Configuration

AWS template that an Auto Scaling group uses to launch EC2 instances. Contains AMI, instance type, key pair, security groups, and block device mapping.

layer 4

The transport layer from the ISO/OSI model, which provides end-to-end or host-to-host communication services for applications within a layered architecture of network components and protocols.

Layer 7 Application Control

A legacy feature of the Barracuda NG Firewall. Barracuda Networks recommends using the new Application Control in Barracuda NextGen Firewall instead.

LDAP
  • Also known as: Lightweight Directory Access Protocol

Application protocol used to manage and access the distributed directory information service.

LDAPS
  • Also known as: LDAP over SSL, Secure LDAP

Connection protocol used between application and Network Directory or Domain Controller. LDAPS communication is encrypted and secure.

legacy

Latest maintenance release for the previous major firmware version.

Lempel-Ziv

A universal lossless data compression algorithm

link aggregation
  • Also known as: 802.3ad Link Aggregation, LAG

Operating mode for Ethernet bundles that uses the LACPDU protocol to negotiate automatic bundling links.

link balancing

Dynamically balancing traffic across multiple Internet Service Provider (ISP) links to ensure Internet continuity and availability, even during ISP outages.

link bonding
  • Also known as: multiport link aggregation

Allows you to aggregate multiple physical network links into a single logical link. You can use link aggregation to achieve multi-gigabit capacity to services and servers.

Link Protection

Barracuda service that automatically rewrites a deceptive URL in an email message to a safe Barracuda URL, and delivers that message to the user.

link state routing
  • Also known as: Open Shortest Path First

A routing protocol that takes link loading and bandwidth when selecting between alternate routes. Example: OSPF.

little-endian

Method of storing or transmitting data in which the least significant bit or byte is presented first. Compare with big-endian.

LiveBoot

Allows administrators to instantly recover VMware virtual guest machines.

LiveBrowse

Enables administrators to view and traverse file structures inside all backed up VMware and Hyper-V VMDK, VHD, and VHDX files. Files and directories can also be downloaded within VMware and Hyper-V snapshots.

local authentication database

Built-in user database for local authentication on the firewall.

local bridge

Bridge that directly interconnects networks in the same geographic area.

local control

Enables administrators to manage their Barracuda Backup appliance in a “connectionless” state, independent of the Barracuda Networks Cloud.

Log Viewer

LSA
  • Also known as: link-state advertisement, link state advertisement

Broadcast packet used by link-state protocols that contains information about neighbors and path costs. Used by the receiving routers to maintain their routing tables.