# Definitions + **Availability:** Percentage of time a connection is usable. + **Border gateway protocol (BGP):** Standardized routing protocol that enables autonomous networks to exchange routing information and determine optimal paths for data to travel across the internet. + **Bidirectional forwarding detection (BFD):** A detection protocol that provides fast forwarding path failure detection times. These fast failure detection times facilitate faster routing reconvergence times. + **Customer gateway:** On-premises resource needs to establish hybrid network connectivity to cloud. + **Equal cost multi path (ECMP):** Network routing method that distributes traffic across multiple network paths of the same cost to a single destination. + **IPSec:** Protocol suite that secures IP communications by authenticating and encrypting each IP packet in a data stream, creating secure tunnels between networks. + **Link aggregation group (LAG):** Method for combining multiple network links into a single logical link to increase bandwidth and reliability. + **Media access control security (MACsec):** IEEE standard that provides Layer 2 point-to-point encryption, ensuring data confidentiality, data integrity, and data origin authenticity between network equipment + **Quality of service (QoS):** Techniques and mechanisms used to prioritize network traffic, manage bandwidth allocation, and ensure consistent performance for critical applications and services. + **Resiliency:** Ability to recover from disruptions. + **Transport layer security (TLS):** Security protocol that encrypts communication between a client and a server to protect data from being intercepted or altered. + **Virtual private network (VPN):** Establishes a secure and encrypted connection between a network or device.