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Glossary
- PaaS
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Cloud platform services, where the computing platform (operating system and associated services) is delivered as a service over the Internet by the provider.
- packet
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A unit of data routed between an origin and a destination over a network.
- packet fragmentation
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Part of the processing of TCP IP traffic that consists of fragmenting, sending, and reassembling packets.
- padding
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Additional, meaningless data adds to a packet to increase its size.
- PAYG
- peer
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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.
- persistent storage
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A data storage solution where the data remains intact until it is deleted.
- Personal Firewall
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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
- phishing
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Attempt to obtain sensitive information such as usernames, passwords, and credit card details (and, indirectly, money), often for malicious reasons, by disguising as a trustworthy entity in an electronic communication. See also spear phishing.
- Placement Group
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Logical grouping of AWS instances within a single Availability Zone.
- policy routing
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Also called source-based routing, is used when the source IP address of the connection determines, in part or completely, which route is used.
- policy simulator
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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.
- polling
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A means of Media Access Control where a device may only transmit information when it is given permission to transmit by a controller device.
- POP
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A protocol used to retrieve email from a mail server.
- PPTP
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A network protocol that is used to establish VPN tunnels.
- predictive sender profiling
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A method of blocking spammers who obfuscate their web identities.
- Premium Support
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24/7 support, offered by Barracuda Networks
- private subnet
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A VPC subnet whose instances cannot be reached from the Internet.
- provisioning
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Process of preparing and equipping a network or device to allow it to provide services to its users.
- public cloud
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Cloud computing model, in which a service provider makes resources, such as applications and storage, available to the general public over the Internet. Examples include Amazon AWS, Google Cloud Platform, and Microsoft Azure.
- Public DNS
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Public Domain Name System (DNS) resolution service.
- public key
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A value provided by a designated authority as an encryption key. Public key cryptography (asymmetric cryptography) uses pairs of keys: public keys that may be distributed widely, and private keys that are known only to the owner.
- public subnet
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A subnet whose instances can be reached from the Internet.
- quarantine
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Isolating a file suspected of being infected with a virus to a specific area of a system to prevent it from infecting other files.
- RADIUS
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Networking protocol that provides centralized Authentication, Authorization, and Accounting (AAA or Triple A) management for users who connect and use a network service.
- RAID
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Provides a way of storing the same data in different places (redundantly) on multiple hard disks.
- range-specific
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1. Relating to a set range of values.2. Global settings that apply to a range on a Barracuda NextGen Control Center.
- RBL
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List of IP addresses whose owners do not stop the proliferation of spam. The owners often have customers who are associated with creating or relaying the spam.
- RDS
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AWS term, managed Relational Database Service
- real time
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The time in which an action is performed.
- regular expression
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A combination of characters or character classes and operators that describe text for matching purposes.
- replication
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Involves sharing information to ensure consistency between sources. By comparison, backups save data unchanged for a long period of time; replicas undergo frequent updates.
- Reserved Instance
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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.
- Reserved IP addresses
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IP addresses reserved for special purposes. For example, IP addresses reserved and assigned to Azure cloud services.
- retention policy
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Rules that determine whether data older than a defined age will be deleted of offloaded to another device or cloud.
- reverse lookup zone
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Support the secondary function of Domain Name System (DNS) - the resolution of IP addresses to host names.
- reverse proxy
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The HTTP Proxy directs incoming requests from other servers to clients without providing the origin details.
- RMA
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Numbered authorization provided by a merchant, like Barracuda Networks, to permit the return of a product.
- role-based administration
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Gives administrators the ability to assign specific privileges to users and to present the user with only the tools and permissions necessary to perform specific tasks, based on their role within the organization.
- rollback
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A return to a previous state after an installation or configuration failure.
- root certificate
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A CA-signed or self-signed public key certificate that identifies the root certificate authority (CA).
- Round-Robin policy
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Method of traffic balancing among links/interfaces in circular order.
- Route 53
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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.
- route table
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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.
- routed bridging
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Bridging mode where the router acts as a bridge.
- RPC protocols
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Congestion control algorithm designed for fast download times such as user response times, or flow-completion times.
- RRS
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One of the four storage classes in AWS. 99.9& SLA reduced redundancy storage, lower fault tolerance, stored in 1 region.
- ruleset
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A collection of one or more access or application rules.