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A hardware addition to an existing computing device that increases the computer's processing speed and capabilities.

access control list

Constrains the flow of traffic by individual IP address or by a range of IP addresses.

Access Control service

Service on the Barracuda NextGen Firewall F-Series that defines security policies for network users and enables the firewall to perform identity and health checks on clients.

access key

The combination of an access key ID (like AKIAIOSFODNN7EXAMPLE) and a secret access key (like JalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY). You use access keys to sign API requests that you make to AWS.

access key ID

A unique identifier that's associated with a secret access key, the access key ID and secret access key are used together to sign programmatic AWS requests cryptographically.

Access Monitor

Component of the Barracuda Network Access Client. Monitoring software, responsible for sending the endpoint health status to the Access Control Service for baselining.

access rule

Forwarding rule that determines how clients on a source network access resources on a destination network.


Enables you to configure Microsoft Exchange accounts on a mobile device.

adaptive profiling

Technique of analyzing request and response traffic to generate customized security profiles for the web application. See also exception profiling. 


Additional feature, such as Barracuda Microsoft Outlook Add-In. 


A piece of software that enhances another software application and usually cannot be run independently.

address mapping

Technique that allows different protocols to interoperate by translating addresses from one format to another.

Advanced Threat Protection

Uses next-generation sandbox technology powered by full-system emulation to catch not only persistent threats and zero-day exploits, but also advanced malware designed to evade detection. Files are uploaded to and scanned in the Barracuda ATP cloud. Formerly known as Advanced Threat Detection, or ATD.

AES 256-bit

A specification for the encryption of electronic data. 256-bit refers to the key length and is the maximum value.

allow list

List of domains, users, or hosts that are allowed access, especially referring to mail and web traffic.

Amazon Elasticsearch Service

AWS-managed service for deploying, operating, and scaling Elasticsearch in the AWS Cloud.

Amazon Web Services

Amazon's public cloud platform that lets you build, deploy, and manage applications across a global network of datacenters.


AWS template that contains configuration, application server, and applications required to launch an EC2 AWS Instance.


Mobile device operating system. Compare to Apple iOS.


Protection against malicious software, used to disrupt computer or mobile operations, gather sensitive information, gain access to private computer systems, or display unwanted advertising.


Antivirus software, abbreviated: AV. Used to prevent, detect and remove malicious software.


 A set of tools and procedures provided by the programmer of an application so that other programmers can control, exchange data with, or extend the functionality of an application.


Access Point Name provided by an ISP for wireless WAN connections.

App Redirect access rule

Access rule that rewrites the destination IP address and forwards the traffic to a service running on a local IP address of the Barracuda NextGen Firewall F-Series.

Apple iOS

Apple mobile operating system for devices such as iPhone and iPad. Compare to Android.


Device or piece of equipment.

Application Control

Enables you to control application traffic, including sub-applications, such as chat function and picture uploading.

application layer

Layer 7 of the OSI reference model. This layer provides services to application processes (such as electronic mail, file transfer, and terminal emulation) that are outside of the OSI model.

Application Load Balancer

AWS feature that makes routing decisions at the application layer (HTTP/S), supports path-based routing, and can route requests to one or more ports on each EC2 instance or container instance in a VPC.

application object

Firewall object that references lists of applications. Can be applied to an application rule on the Barracuda NextGen Firewall F-Series.

application rule

Firewall rule that allows you to block or throttle traffic for detected applications.


Considering and inspecting application traffic. The Barracuda NextGen Firewall is an application-aware network firewall.

application-based provider/application-based link selection

When configured, the Barracuda NextGen Firewall F-Series routes traffic through the provider link that is defined in the connection object.


Protocol for mapping IP addresses to physical addresses such as Ethernet or Token Ring.


Referring to a standard 7-bit character system that includes the alphanumeric characters and printer control codes.


A broadband transmission system using 53-octet packets over a cell-switched network at speeds up to 2.2 GBPS.

Audit Log service

Service on the Barracuda NextGen Firewall F-Series that is used for central audit log file collection.

Authentication Client

Application used to automate Offline Firewall Authentication on the Barracuda NextGen Firewall F-Series.

authoritative DNS

Name server that gives answers in response to queries about names in a DNS zone.

authority zone

Associated with DNS. A section of the domain-name tree for which one name server is the authority.

Auto Scaling

A web service designed to launch or terminate AWS instances automatically based on user-defined policies, schedules, and health checks.

Auto Scaling Group

A representation of multiple EC2 instances that share similar characteristics, and that are treated as a logical grouping for the purposes of instance scaling and management.

autonomous system

Collection of networks under a common administration sharing a common routing strategy. Autonomous systems are subdivided by areas. An autonomous system must be assigned a unique 16-bit number by the IANA. 

Availability Zone

A distinct location within an AWS region that is insulated from failures in other Availability Zones, and provides inexpensive, low-latency network connectivity to other Availability Zones in the same region.


Virus scanning engine used by the Barracuda NextGen Firewall F-Series. Avira is integrated in the Virus Scanner service.

AWS Certificate Manager

A web service for provisioning, managing, and deploying Secure Sockets Layer/Transport Layer Security (SSL/TLS) certificates for use with AWS services.

AWS Direct Connect

Enables you to use the Internet privately through AWS cloud services by linking your internal network to an AWS Direct Connect location. You can create virtual interfaces directly to the AWS cloud and to Amazon VPC, bypassing Internet service providers in your network path.


A managed cloud platform that lets connected devices easily and securely interact with cloud applications and other devices.

AWS region

A named set of AWS resources in the same geographical area. A region comprises at least two Availability Zones.

AWS Route Table

Routing table used in AWS subnets, that can be modified, for example, to use an Internet gateway as the target for the default route.

AWS Management Console

A simple and intuitive web-based user interface to access and manage AWS.


Microsoft's public cloud platform that lets you build, deploy, and manage applications across a global network of datacenters.

Azure PowerShell

A set of modules that provide cmdlets to manage Azure with Windows PowerShell. 

Azure Resource Manager

Azure deployment mode that enables you to work with the resources in your solution as a group. Recommended for new deployments.

Azure Route Table

Allows you to create network routes for traffic between subnets and to the Internet.

Azure Security Center

Feature that helps to prevent, detect, and respond to threats with increased visibility of Azure resources, and provides security monitoring and policy management.

Azure Service Manager

Classic deployment mode used in legacy Azure deployments. ASM offers a web interface and PowerShell for deployments. 

Azure Storage Resource Group

Microsoft Azure resource group that may contain storage accounts for OS disks, source images, and all other data an application requires. 

back-end server

Part of the back-end process, that usually consists of server, application, and database. The back end is where the technical processes happen, as opposed to the front end, which is usually where the user's interaction occurs.


Referring to the Internet, a central network that provides a pathway for other networks to communicate.

Backup Export Tool

Allows export of historical revisions of data backed up and stored on Barracuda Backup appliances..


Operating mode for Ethernet bundles where the link is chosen by calculating the hash out of the source/destination MAC (Layer 2) combined with the IP addresses (Level 3).

Bare-Metal Restore 

The process of reformatting a computer from scratch after a catastrophic failure. Typically, the process involves reinstalling the operating system and software applications and then, if possible, restoring data and settings.

Barracuda Backup-as-a-Service

Versions of Barracuda Backup can be purchased as an annual service that includes an appliance, Energize Updates, Instant Replacement, and Unlimited Cloud storage.

Barracuda Campus

Online documentation for all Barracuda products, located at campus.barracuda.com. Contains feature descriptions, how-to articles, and release notes. Formerly known as Barracuda University and Barracuda TechLibrary.

Barracuda Central

Provides a wide range of statistics, threat information, and a number of useful services to help manage and secure your network. Shares information with Barracuda Networks customers and the Internet security community. 

Barracuda cloud

Barracuda's cloud, where services such as the Barracuda Web Security Service and Email Security Service are situated.

Barracuda Cloud Control

A comprehensive cloud-based service that enables administrators to monitor and configure multiple Barracuda Networks products from a single console.

Barracuda Earth

Barracuda NextGen Firewall F-Series feature that provides a visual representation of the status of VPN site-to-site tunnels around the world. Information is retrieved from the Control Center.

Barracuda Message Center 

An encrypted email message service for the Barracuda Email Security Gateway and the Barracuda Email Security Service.

Barracuda Networks account

Credentials granted and used to log into your Barracuda Networks product.

Barracuda Networks Technical Support

Contact Barracuda Networks Technical Support if you need help with your Barracuda Networks product. Visit https://www.barracuda.com/support/index for details.

Barracuda NextGen Admin

Application used to administer Barracuda NextGen Firewalls F-Series and Barracuda NextGen Control Centers. 

Barracuda NextGen Control Center

Central administration appliance designed to manage a large number of Barracuda NextGen Firewalls F-Series. 

Barracuda NextGen Firewall F-Series

Enterprise-grade, next-generation firewall, purpose-built for efficient deployment and operation within dispersed, highly dynamic, and security-critical network environments.

Barracuda NextGen Firewall FSC-Series

Enables Internet of Things (IoT) devices and micro-networks to connect to the corporate datacenter via Secure Access Concentrators (FSACs).

Barracuda NextGen Firewall X-Series

Application-aware network firewall appliance, designed for organizations without dedicated IT personnel to manage firewalls.

Barracuda NG Web Security Gateway (IBM ISS)

Web Security Gateway engine used by the URL Filter service on the Barracuda NextGen Firewall F-Series. The Barracuda NG Web Security Filter can only be used in combination with the HTTP proxy and is not compatible with Application Control. Requires a Barracuda NG Web Security Gateway subscription.

Barracuda portal

Entry point into Barracuda cloud services.

Barracuda Reputation

A database maintained by Barracuda Central and includes a list of IP addresses of known, good senders as well as known spammers, or IP addresses with a poor reputation.

Barracuda Reputation Block List

Real time blocklist provided by Barracuda Networks that is by default added to the Email Security Gateway service rules.

Barracuda VPN Client

Component of the Barracuda Network Access Client, available for Windows, Linux and macOS. VPN client that secures mobile desktops connecting to the corporate LAN through the Internet.

Barracuda Web Security Agent

A tamper-proof client that can be installed on remote, off-network laptops or desktops to help implement a consistent web security policy across localized and distributed workforces.

Barracuda Web Security Gateway

Integrated content filtering, application blocking, and malware protection solution that enforces Internet usage policies on and off network by blocking access to websites and Internet applications and eliminates spyware and other forms of malware.

Barracuda Web Security Service

A cloud-based service that deploys Barracuda’s web security technology for organizations looking to leverage the scalability and flexibility of the cloud. The WSS unites spyware, malware, and virus protection with a policy and reporting engine.

Barracuda F-Series Install

Downloadable tool used to install the Barracuda NextGen Firewall F-Series.

Bayesian analysis

A statistical procedure that estimates parameters of an underlying distribution based on the observed distribution.

BGP neighbors

BGP peers that are established by manual configuration between routers to create a TCP session on port 179. 


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


The standard TCP/IP naming service that links network names with IP addresses.

block device

Storage device that moves data in sequences of bytes or bits (blocks). Example: hard disk, CD-ROM drive, flash drive.

block device mapping

Defines the block devices (instance store volumes and EBS volumes) to attach to an AWS instance. 


List of domains, users, or hosts that are denied access, especially refers to mail and web traffic. Sometimes known as blacklist. Compare to allow list or whitelist.

Boolean search

Allows searchers to combine words and phrases using the words AND, OR, NOT (known as Boolean operators) to limit, broaden, or define a search.


Loader for the operating system. A program that runs after completion of the self tests in the hard boot process, then loads and runs the software.

border gateway

Router that communicates with routers in other autonomous systems.

Border Gateway Protocol

A standardized dynamic routing protocol designed to exchange routing and reachability information between autonomous systems on the Internet.


A network of private computers infected with malicious software and controlled as a group without the owners’ knowledge, for example, to send spam messages. The word botnet is a combination of the words “robot” and “network”.

box layer

An operating level of the Barracuda NextGen Firewall F-Series. Services run on the box layer.

box level

A configurable operating instance of the Barracuda NextGen Control Center.


The action taken by network equipment to create an aggregate network from either two or more communication networks, or two or more network segments. Bridging is distinct from routing, which allows multiple different networks to communicate independently while remaining separate.

brute-force protection

Protection against a brute-force attack, which consists of systematically checking all possible keys or passwords until the correct one is found. This type of attack uses a large number of attempts to gain access to a system.


In AWS, container for objects that can be stored in Amazon S3.


The practice of allowing employees or members of an organization to use their own computers, phones, or other devices for work.

Caching DNS service

Forwarding DNS service (BDNS) on the Barracuda NextGen Firewall F-Series that acts as a DNS proxy to speed up DNS queries.

CC Access Control service

Box-level service on the Barracuda NextGen Control Center that specifies the number of days to delete access cache entries generated by activities traversing the Access Control Server.

CC Configuration service

Box-level service on the Barracuda NextGen Control Center that allows remote configuration of both the Control Center and managed F-Series Firewalls.


Box-level service of the Barracuda NextGen Control Center that specifies DNS zones such as hosts, domains, and mail-exchangers.

CC Event service

Box-level service on the Barracuda NextGen Control Center that processes events generated by the managed F-Series Firewalls.

CC Firewall

Box-level service on the Barracuda NextGen Control Center. The CC Firewall service has the same features as the firewall service on a NextGen Firewall F-Series, except for Virus Scanning, URL Filtering, and ATD.

CC FW Audit Log service

Box-level service on the Barracuda NextGen Control Center that receives structured firewall data from managed F-Series Firewalls and stores the firewall audit information in a relational database installed on the Control Center. 

CC PKI service

Box-level service on the Barracuda NextGen Control Center that is used for handling certificates.

CC Statistics Collector (dstatm)

Box-level service on the Barracuda NextGen Control Center that collects raw data from the managed F-Series Firewalls and processes it according to specified transfer settings.

CC Statistics Viewer (qstatm)

Box-level service on the Barracuda NextGen Control Center that collects raw data from the managed F-Series Firewalls and processes it according to specified transfer settings.

CC syslog proxy

Box-level service of the Barracuda NextGen Control Center, used for syslog streaming.

CC Syslog service

Box-level service of the Barracuda NextGen Control Center that listens for and processes incoming log messages from managed boxes.

CC VPN service

Box-level service on the Barracuda NextGen Control Center that is responsible for tunnel termination and tunnel handling.

CC Firewall Audit Info Viewer 

Displays firewall data on the FWAUDIT tab of the Barracuda NextGen Control Center.

central management

Allows administrators to configure multiple units from a centralized location. For example, configuring multiple Barracuda NextGen Firewall F-Series units from the Barracuda NextGen Control Center.


A document or seal certifying the authenticity of something. A digital certificate certifies the ownership of a public key. This allows relying parties to rely upon signatures or on assertions made about the private key that corresponds to the certified public key.

certification authority

In cryptography, a certificate authority or certification authority (CA) is an entity that issues digital certificates.


Log of configuration changes on the appliance. Can be found in the release notes of the product.


The result of a mathematical operation that uses the binary representation of a group of data as its basis, usually to check the integrity of the data.


Technique supported by BGP4 and based on route aggregation. CIDR allows routers to group routes together in order to cut down on the quantity of routing information carried by the core routers. 


Enacted by US Congress in 2000 to address concerns about children's access to obscene or harmful content over the Internet.


Virus scanning engine that is used by the Barracuda NextGen Firewall F-Series. ClamAV is integrated in the Virus Scanner service.

Class A|B|C|D network

Classes of IP addresses as defined in the Internet Protocol hierarchy.

classic load balancer

In AWS, a Classic Load Balancer makes routing decisions at either the transport layer (TCP/SSL) or the application layer (HTTP/HTTPS), and supports either EC2-Classic or a VPC (virtual private cloud).


Malicious technique where a user is tricked into clicking on a button or link on a website using hidden clickable elements inside an invisible iFrame.

Client-to-Site VPN

Enables an encrypted connection to an organization'’s network from any desktop or mobile device. Contrast with site-to-site VPN.


A search engine optimization (SEO) technique in which the content presented to the search engine spider is different from that presented to the user’'s browser.

cloud integration

AWS cloud integration allows the firewall to connect directly to the AWS service fabric to rewrite routes in AWS route tables and to retrieve information for the cloud element on the dashboard. Cloud integration also works with Azure.

cloud operating system

A computer operating system that is specially designed to run in a provider's datacenter and be delivered to the user over the Internet or another network. Windows Azure is an example of a cloud operating system or 'cloud layer' that runs on Windows Server 2008.

cloud portability

The ability to move applications and data from one cloud provider to another. This is the opposite of "vendor lock-in".

Cloud Protection Layer

Optional feature of the Barracuda Email Security Gateway. An additional layer of protection that blocks threats before they reach the network and provides email continuity.

Cloud Relay Service

Allows you to relay journal mail from hosted mail services, such as Office 365 and Google Apps, to a Barracuda Message Archiver.

cloud replication

Replicates backup data to the Barracuda Cloud, ensuring against data loss in case of a catastrophe.

cloud storage

A model of data storage where the digital data is stored in logical pools, the physical storage spans multiple servers (and often locations), and the physical environment is typically owned and managed by a hosting company.

cloud-based encryption

A service offered by cloud storage providers whereby data is transformed using encryption algorithms and is then placed on a storage cloud.


AWS management tool that lets you create, manage, and update a collection of AWS resources using templates and allowing Json code for template deployment.

CloudFormation Stacks

Host uploaded content and can be deployed in CloudFormation, an AWS feature.


An AWS content delivery service that helps you improve the performance, reliability, and availability of your websites and applications.


Replacing traditional IT operations with lower-cost, outsourced cloud services.


AWS management tool to monitor resources and applications. Aggregates data and metrics (cpu load, network throughput, disk io, etc), filters it, and provides alarm actions.


Global settings that apply to a cluster on a Barracuda NextGen Control Center.

collision domain

In Ethernet, the network area within which frames that have collided are propagated. Repeaters and hubs propagate collisions. LAN switches, bridges and routers do not.

community string

Text string that acts as a password and is used to authenticate messages sent between a management station and a router containing an SNMP agent. The community string is sent in every packet between the manager and the agent.

compliance, regulatory

Regulatory compliance describes the steps organizations must take to comply with relevant laws and regulations.

compression, bandwidth

A reduction in either the time to transmit or in the amount of bandwidth required to transmit data.

compression, data

The process of encoding digital information by using fewer bits.

compression, HTTP

Capability in web servers and web clients to improve transfer speed and bandwidth utilization.


A synonym for a multi-port repeater that may also perform bridging and routing functions.

confirmation page

Feature of the Barracuda NextGen Firewall, allows you to control access to the Internet or other networks by only allowing authenticated users. 


Traffic in excess of network capacity.

connection draining

AWS feature, lets you scale down EC2 instances to reduce sessions.

connection object

A firewall object that can be applied to an access rule on the Barracuda NextGen Firewall F-Series. A connection object defines the egress interface and source (NAT) IP address for traffic matching the rule.

connection pool

Barracuda Web Application Firewall (WAF) feature. A cache of database connections is maintained so those connections can be reused when future requests to the database are required. Connection pools are used to enhance the performance of executing commands on a database and also cuts down on the amount of time a user must wait to establish a connection to the database.

content delivery network

A distributed system consisting of servers in discrete physical locations, configured in a way that clients can access the server closest to them on the network, thereby improving speeds.

content stripping

Configuring your mail gateway to remove certain types of content, like attachments and HTML tags, from email, before sending it to the recipient.


Configurable schedule for specific commands to be executed once or on a regular basis.

cross region replication

Feature of S3 storage class in AWS. Once enabled, every object uploaded to a particular S3 bucket is automatically replicated to a designated destination bucket located in a different AWS region.

cross-site scripting

A type of computer security vulnerability, typically found in web applications, that enables attackers to inject client-side scripts into web pages viewed by users.


Barracuda remote access client for mobile and desktop devices that provides VPN access and allows administrators to manage dynamic firewall rules.


Bullying that takes place using electronic technology and communication tools including social media sites, text messages, chat, and websites. The Barracuda Web Security Gateway provides an alert for cyberbullying.


Registering or using an Internet domain name, based on a name that is not yours, intending to profit from the owner of the name.