Glossary

Symmetric-key block cipher used in data encryption that applies the Data Encryption Standard (DES) cipher algorithm three times to each data block.

Wireless networking standard that uses multiple antennas to increase data rates. 

IEEE 802.1Q is a standard for virtual LANs (VLANs) on an Ethernet network that defines VLAN tagging for Ethernet frames and frame handling for bridges and switches, and contains provisions for a quality of service prioritization scheme (IEEE 802.1p). It also defines the Generic Attribute Registration Protocol.

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

Software utility that can be used in conjunction with a device or service; for example, Barracuda Outlook Add-In.

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

Malicious cyber attacks directed at a specific target, usually over a long period of time. APTs are often run by professional organizations, looking to steal information rather than just money.

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 network attacks that combine several different known evasion methods to create a new technique that is delivered over several layers of the network simultaneously. 

Protection against attacks that involve obfuscated code. Obfuscation may involve encrypting code, stripping out potentially revealing metadata, renaming useful class and variable names, or adding meaningless code to an application binary. 

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.

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

Device or piece of equipment.

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.

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

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

Type of attack in which a malicious actor sends falsified ARP (Address Resolution Protocol) messages over a local area network. This results in the linking of an attacker's MAC address with the IP address of a legitimate computer or server on the network.

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

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

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

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.

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. 

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.

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

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

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.

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).

Rate of data transfer, usually expressed in multiples of bits per second (bps).

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

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. 

A complementary component of all Barracuda Networks products, providing an added layer of protection and scalability.

Dynamically balances traffic across multiple ISP links to ensure Internet continuity and availability, even during ISP outages. It balances both outbound and inbound traffic intelligently, so users have Internet access whenever they need it.

Credentialed account used to log into Barracuda Services and Barracuda Appliance Control.

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

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

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.

Entry point into Barracuda cloud services.

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

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

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

Licence-free symmetric encryption algorithm that can be used as a replacement for the DES and IDEA algorithms.

Data deduplication method that analyzes data streams at the byte level by performing a byte-by-byte comparison of new data streams versus previously stored ones.

Licence-free symmetric encryption algorithm (key block cipher).

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.

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.

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

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).

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.

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.

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

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.

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.

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.

Traffic in excess of network capacity.

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

Masks the virtualization environment, so payload can be detonated more effectively.

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.

A facility used to house computer systems and associated components, such as telecommunications and storage systems.

Occurs when data or a data stream is stored in a location too short to hold its entire length. May occur automatically, such as when a long string is written to a smaller buffer, or deliberately, when only a portion of the data is wanted.

Document that summarizes the performance and other technical characteristics of a product, machine, component (e.g., an electronic component), material, a subsystem (e.g., a power supply) or software in sufficient detail to be used by a design engineer to integrate the component into a system.

Remote procedure call system that allows programmers to write distributed software without having to worry about the underlying network code.

An Internet hosting option where an organization leases an entire server, fully dedicated to their use. This is also an option in the public cloud. The price for a Dedicated Host varies by instance family, region, and payment option.

Amazon EC2 instance that runs on single-tenant hardware dedicated to a single customer.

An option you can purchase from a cloud vendor to guarantee that sufficient capacity will be available to launch Dedicated Instances into a virtual private cloud (VPC).

Distributed database that translates domain names, like www.example.com, into unique IP address.

A temporary database, maintained by a computer's operating system, that contains records of all recent visits and attempted visits to websites and other Internet domains.

Database record used to map a URL to an IP address.

Portion or administrative space within the global Domain Name System (DNS). Each DNS zone represents a boundary of authority, subject to management by certain entities. The total of all DNS zones are organized in a hierarchical, tree-like order of cascading lower-level domains and form the DNS namespace.

Open-source software that automates the deployment of applications inside virtualized software containers.

A layered file system template that is the basis of a Docker container. Docker images can comprise specific operating systems or applications.

A  cyber-attack where the perpetrator seeks to make a computer or network resource unavailable to users by temporarily or indefinitely disrupting services of a host connected to the Internet. Denial of Service attacks are typically accomplished by flooding the target with superfluous requests in an attempt to overload systems and prevent legitimate requests from being fulfilled. See also Distributed Denial of Service or DDoS.

Term used in context with Traffic Intelligence (TI). Using dynamic path selection, the session is balanced depending on the amount of traffic.

Routing that adjusts automatically to network topology or traffic changes. Also called adaptive routing.

A fully managed Amazon NoSQL database service that provides fast and predictable performance with seamless scalability.

Used by the AWS service CloudFront. Feature that offers content to end users via geographically closer locations to improve their experience.

Internet protocol for exchanging routing information between autonomous systems. 

A web service for deploying and managing applications in the AWS cloud without worrying about the infrastructure that runs those applications.

Provides Barracuda Networks products with protection from the latest Internet threats. These updates are sent out hourly, or more frequently if needed, to ensure that appliances always have the latest and most comprehensive protection. Barracuda Energize Updates subscriptions must be purchased with any Barracuda Networks appliance. Includes basic support, firmware maintenance, security updates, and early release firmware.

The use of a master key and a data key to algorithmically protect data. The master key is used to encrypt and decrypt the data key and the data key is used to encrypt and decrypt the data itself.

Local area network technology that uses special twisted pair or fiber optical cables. As per the OSI model, Ethernet provides services up to and including the data link layer.

Contract between the Barracuda and the purchaser, establishing the purchaser's right to use Barracuda software.

Bypassing an information security device in order to deliver an exploit, attack, or other form of malware to a target network or system, without detection.

The use of software, data, or commands to 'exploit' a weakness in a computer system or program to carry out some form of malicious intent, such as a denial-of-service attack, Trojan horses, worms, or viruses.

A Denial of Service (DoS) attack that is designed to bring a network or service down by flooding it with large amounts of traffic.

AWS service that enables you to capture information about the IP traffic going to and from network interfaces in a VPC.

Techniques of examining digital media with the aim of identifying, preserving, recovering, analyzing, and presenting facts and opinions about the digital information.

Standard network protocol used to transfer files between a client and server on a computer network.

Allows the proxy to control FTP traffic. When a client uploads or downloads files, the proxy identifies the traffic as FTP, allowing the appliance to control file transfers using TCP optimization and caching.

A gigabit, or 10^9 bits.

A gigabyte, or 10^9 bytes, or 8000 million bits.

A unit of frequency equal to 10^9 hertz, which is defined as one cycle per second.

Integration of Google Accounts, for example in authentication processes.

A service that enables developers to create and run web applications on Google's infrastructure and share their applications via a pay-as-you-go, consumption-based plan with no setup costs or recurring fees.

Standard that defines the protocols to provide audio-visual communication sessions on any packet network. H.323 addresses call signaling and control, multimedia transport and control, and bandwidth control for point-to-point and multi-point conferences.

Barracuda program that allows existing appliance customers with an active Energize Updates subscription to migrate to the latest hardware platforms at a reduced price -- ensuring customers benefit from the latest hardware improvements and firmware capabilities.

Deployment method that ensures that the services running on the system are always available even if one system is down due to maintenance or a hardware fault.

Protocol for submitting data over a network, commonly used to load website content in a web browser.

Consists of communication over HTTP within a connection encrypted by TLS or SSL. The main motivation is authentication of the visited website and protection of the privacy and integrity of the exchanged data.

Infrastructure is the backbone of all of your business operations.

Network security feature that monitors local and forwarding firewall traffic for malicious activities.

A framework of open standards for protecting communications over Internet Protocol (IP) networks.

Routing node in an OSI network.

Communication protocol offered by telephone companies that permits telephone networks to carry data, voice, and other source traffic.

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.

A kilobit.

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

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

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

Latest maintenance release for the previous major firmware version.

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

Macintosh Operating System. Formerly known as Mac OS X.

Modifying the source IP address and port of a packet (Source NAT) to be the primary IP address assigned to an outgoing interface with a dynamic address (DHCP).

A megabit.

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

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

A database used for managing the entities in a communication network. Often associated with SNMP.

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

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.

A packet-forwarding method for high performance networks. Directs data between network nodes based on short path labels, instead of long addresses.

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

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

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.

The process of modifying IP address information in IP packet headers while in transit across a traffic routing device. The simplest type of NAT provides a one to one translation of IP addresses.

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

A computer networking methodology with the goal to establish and maintain Internet protocol connections across gateways that implement network address translation (NAT). NAT breaks the principle of end-to-end connectivity originally envisioned in the design of the Internet.

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.

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.

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.

A network administration command-line tool available for many computer operating systems for querying the Domain Name System (DNS) to obtain domain name or IP address mapping or for any other specific DNS record.

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

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

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.

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

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

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

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

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.

Cloud platform services, where the computing platform (operating system and associated services) is delivered as a service over the Internet by the provider.

A unit of data routed between an origin and a destination over a network.

Part of the processing of TCP IP traffic that consists of fragmenting, sending, and reassembling packets.

Additional, meaningless data adds to a packet to increase its size.

Conserves IP addresses by permitting multiple devices on a local network to be mapped to a single public IP address. An extension to network address translation (NAT).

A device to which a computer has a network connection that is relatively symmetrical and where both devices can initiate or respond to a similar set of requests.

A data storage solution where the data remains intact until it is deleted.

Component of the Barracuda Network Access Client. Centrally managed host firewall that can handle up to four different rulesets at once, depending on the policy applicable to user, machine, date, and time

Logical grouping of AWS instances within a single Availability Zone.

Also called source-based routing, is used when the source IP address of the connection determines, in part or completely, which route is used.

A tool in the IAM AWS Management Console that helps you test and troubleshoot policies so you can see their effects in real-world scenarios.

A means of Media Access Control where a device may only transmit information when it is given permission to transmit by a controller device.

Network protocol for encapsulating PPP (point to point protocol) frames inside Ethernet frames.

A network protocol that is used to establish VPN tunnels.

24/7 support, offered by Barracuda Networks

A VPC subnet whose instances cannot be reached from the Internet.

Public Domain Name System (DNS) resolution service.

A subnet whose instances can be reached from the Internet.

Overall performance of the network, especially as seen by the network users. Includes things such as throughput, availability, and error rate. 

AWS term, managed Relational Database Service

The time in which an action is performed.

A combination of characters or character classes and operators that describe text for matching purposes.

A pricing option for EC2 instances that discounts the on-demand usage charge for instances that meet the specified parameters. Customers pay for the entire term of the instance, regardless of how they use it.

IP addresses reserved for special purposes. For example, IP addresses reserved and assigned to Azure cloud services.

Support the secondary function of Domain Name System (DNS) - the resolution of IP addresses to host names.

The HTTP Proxy directs incoming requests from other servers to clients without providing the origin details.

Numbered authorization provided by a merchant, like Barracuda Networks, to permit the return of a product.

A return to a previous state after an installation or configuration failure.

A CA-signed or self-signed public key certificate that identifies the root certificate authority (CA).

AWS service for DNS-based load balancing that connects user requests to EC2 instances, ELBs, S3 buckets, and Internet applications and provides health checks for monitoring or to route traffic to healthy endpoints.

In AWS, a set of routing rules that controls the traffic leaving any subnet that is associated with the route table. You can associate multiple subnets with a single route table, but a subnet can be associated with only one route table at a time.

Bridging mode where the router acts as a bridge.

Congestion control algorithm designed for fast download times such as user response times, or flow-completion times. 

One of the four storage classes in AWS. 99.9& SLA reduced redundancy storage, lower fault tolerance, stored in 1 region.

A collection of one or more access or application rules.

Feature of Google Search that acts as an automated filter of pornography and potentially offensive content.

An online SaaS company that is best known for delivering customer relationship management (CRM) software to companies over the Internet.

The suitability of a network system to operate properly and efficiently when configured on a large scale.

Network layer protocol that provides extended routing, flow control, segmentation, connection orientation, and error correction facilities in Signaling System 7 telecommunications networks.

A wide area network controlled by software. Control and data are decoupled, simplifying both network hardware and management.

A port on a computing device that is capable of either transmitting or receiving one bit at a time. 

Certificate for a service, signed by a valid, trusted entity, that allows access without further validation. 

The layer in the OSI 7-Layer Model that is concerned with managing the resources required for the session between two computers.

Algorithm that reads its input exactly once, in order, without unbounded buffering. Generally requires O(n) time and less than O(n) storage (typically O), where n is the size of the input.

Communications protocol for signaling and controlling multimedia communication session such as voice and video calls.

Securely connects entire networks to each other, for example, connecting a branch office network to a company headquarters network.

A contractual agreement by which a service provider defines the level of service, responsibilities, priorities, and guarantees regarding availability, performance, and other aspects of the service.

Operates as an application-layer network protocol mainly used for providing shared access to files, printers, and serial ports and miscellaneous communications between nodes on a network.

Multi-Factor Authentication (MFA) solution that adds an extra security layer for a broad range of authentication clients.

IBM's communications architecture and strategy.

Capture of the state of a system at a particular point in time.

The SNMP service is used to remotely monitor the network and system state of a Barracuda NextGen Firewall using a network management system (NMS).

Feature to push notifications to mobile services and trigger actions, in Amazon Web Services (AWS).

Network package format for time synchronization, similar to NTP, only recommended for simple applications.

Changing the source address/port in the IP header of a packet. Example: changing a private IP address/port into a public address/port in the IP header of a packet leaving the network.

Used when the source IP address of the connection determines, either in whole or in part, which route is used.

A protocol enabling the owner of an Internet domain to specify which computers are authorized to send mail with envelope-from addresses from their own domain. 

Purchasing option that allows a customer to purchase unused Amazon EC2 computer capacity at a highly-reduced rate.

Amazon Simple Queue Service (SQS) is a fast, reliable, scalable, fully managed message queuing service.

VPN client that can be installed on the Barracuda CloudGen Firewall and then accessed through the Barracuda SSL VPN web portal. (Barracuda SSL VPN is a different product.)

Route that is explicitly configured and entered into the routing table. Static Routes take precedence over routes chosen by dynamic routing protocols.

Hosting of a static website in Amazon S3. When a bucket is enabled for Static website hosting, all content is accessible to web browsers via the Amazon S3 website endpoint of the bucket.

Data compression technique used in wireless networks.

Partitioning of an IP address space into several smaller address spaces.

Method for handling of log file messages that are to be transferred to another system for analyzing purposes.

An intrusion into a network cable by a connector.

The TCP Proxy is placed between browser and web server and filters requests and responses in TCP streams.

A Transport and Network Layer Protocol, respectively, used for communication in the Internet and often in private networks.

A protocol to access a remote computer system, often a Unix system, over the network. Origin: Teletype Network.

Communications processor that connects asynchronous devices such as terminals, printers, hosts, and modems to any LAN or WAN that uses TCP/IP, X.25, or LAT protocols.

A simplified version of FTP (file tranfer protocol).

A date/time string to mark an occurrence of an event. 

The HTTP Proxy operates transparently to the clients in the network.

Cryptographic protocol that provides communications security over a computer network.

To decrypt encrypted data. The antonym of encrypt.

Product or system.

Security term for traffic monitoring based on username, host, and IP address.

A cloud computing environment optimized for use and built around the compliance needs of specialized industries such as healthcare, financial services, and government operations.

Allows multiple guest virtual machines (VM) to run on a host operating system. Guest VMs can run on one or more levels above the host hardware, depending on the type of virtualization.

Any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). The physical interface behaves like several interfaces, and the switch behaves like multiple switches.

Specifies virtual model of a Barracuda Networks products. For example, Barracuda Web Application Firewall 460 Vx.

IP address used to connect your WAN to the Internet. It is shared by all devices in the WAN. 

Communication circuit that joins two or more local area networks (LANs) into a wide area network (WAN).

Web-based user interface.

A computer system that processes requests via HTTP, the basic network protocol used to distribute information on the web.

A technology for wireless local area networking with devices based on the IEEE 802.11 standards. 

A human-readable data serialization language, commonly used for configuration files.