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Barracuda Essentials

Glossary

macOS

Macintosh Operating System. Formerly known as Mac OS X.

mail server

A server that receives, stores, sends, and processes emails.

malicious site

An Internet site that attempts to install malware onto your device, usually to steal your personal information or to disrupt the operation of your system.

Mb

A megabit.

MBPS

A unit of measure used to describe the rate of data transmission equal to one millions bits per second.

MHz
  • Also known as: megahertz

A unit of frequency equal to 10^6 hertz, which is defined as one cycle per second. 

Microsoft Office 365
  • Also known as: O365

Microsoft's software plus services model that offers Microsoft Office on a subscription-based pricing model, with cloud storage abilities.

Microsoft SharePoint

A web application platform in the Microsoft Office server suite, mainly used for document management and storage.

 

MIME type

Two-part identifier for file formats and format contents transmitted over the Internet.

MOS
  • Also known as: Mean Opinion Score

Measure representing the overall quality of a system or stimulus, calculated by taking the arithmetic mean of individual values of quality. Often used for, but not limited to, video, audio and audiovisual quality.

multi-factor authentication
  • Also known as: multifactor authentication, MFA

Security feature that requires at least two forms of authentication to access a destination or service. 

multilayer switch

Switch that filters and forwards packets based on MAC addresses and network addresses. A subset of LAN switch.

multiplexing

Scheme that allows multiple logical signals to be transmitted simultaneously across a single physical channel.

multitenancy
  • Also known as: multitenant

The existence of multiple clients sharing resources (services or applications) on distinct physical hardware. Due to the on-demand nature of cloud, most services are multitenant.

MX records
  • Also known as: mail exchange record

Resource record in DNS that specifies a mail server responsible for accepting email messages for a recipient’s domain. Includes a preference value to prioritize mail delivery when there are multiple mail servers.

NAT instance

A NAT device, configured by a user, that performs network address translation in a VPC public subnet to secure inbound Internet traffic.

NDR
  • Also known as: non-delivery report, bounce, non-delivery notification (NDN)

An automated email message from the mail system informing the sender that there was a delivery problem with an email message that they sent.

NetBIOS
  • Also known as: Network Basic Input/Output System

API used by applications on an IBM LAN to request services from lower-level network processes. These services might include session establishment and termination, and information transfer.

network layer

Layer 3 of the OSI reference model. This layer provides connectivity and path selection between two end systems. The network layer is the layer at which routing occurs.

non-stub area

Resource-intensive OSPF area that carries a default route, static routes, intra-area routes, interarea routes, and external routes. The only OSPF areas that can have virtual links configured across them and that can contain an ASBR.

NoSQL

Nonrelational database systems that are highly available, scalable, and optimized for high performance. Instead of the relational model, NoSQL databases (like Amazon DynamoDB) use alternate models for data management, such as key–value pairs or document storage.

null ciphers

Form of encryption where the plaintext is mixed with a large amount of non-cipher material.

offline authentication

Authentication method with an internal IP address as destination. Offline Authentication Works with all protocols (for example, POP3).

offsite

Refers to a location other than the subject site. Example: Barracuda Cloud Storage subscription plans provide diverse offsite storage that scales to meet your changing data requirements.

offsite vaulting
  • Also known as: off-site vaulting

The ability to store longer-term backups exclusively in the cloud to free space for daily needs.

On-Demand Instance

An Amazon EC2 pricing option that charges you for compute capacity by the hour with no long-term commitment.

ONC-RPC
  • Also known as: Open Network Computing Remote Procedure Call

Remote procedure call system based on calling conventions used in Unix and the C programming language.

onsite

At the place where a business or activity happens. Compare to offsite.

OpenStack

A free and open-source cloud computing software platform used to control pools of processing, storage, and networking resources in a datacenter.

OSB transformation

Orthogonal sparse bigram transformation. In machine learning, a transformation that aids in text string analysis and that is an alternative to the n-gram transformation. OSB transformations are generated by sliding the window of size n words over the text, and outputting every pair of words that includes the first word in the window.

outbound filtering

Scanning email messages from local users before any potentially harmful messages can be delivered to others on the Internet.

OWA
  • Also known as: Outlook Web Access, Outlook Web App

Microsoft provides OWA as part of Exchange Server to allow users to connect to their email accounts via a web browser, without requiring the installation of Microsoft Outlook.