virtual local-area network (VLAN) A software layer
on top of a physical network that is used to create
separate broadcast domains.
virtual routing and forwarding (VRF) instance
An isolated routing table, also called a context or a
private network.
voice over IP (VoIP) Technology that routes voice and
video conversations over the Internet or any other IP-
based network.
vulnerability A weakness or gap in protection efforts.
W
Waterfall A linear and sequential process for software
development.
webhook A user-defined HTTP callback.
wide-area network (WAN) A network that spans a
large geographic area and uses public networks.
Y
YAML YAML Ain’t Markup Language is a data
serialization and a data storage format that is generally
used to store configuration.
Yet Another Next Generation (YANG) A data
modeling language that was defined by the IETF in RFC
6020 that is used to model configuration and state data
manipulated by NETCONF.