Valid lifetime
The period during which an IPv6 address or delegated prefix remains valid for existing and new use, subject to preferred-state rules. When it expires, the resource must not be used.
Read definitionAlphabetical glossary
V glossary terms
11 definitions beginning with V.
11 terms
Validating resolver
A recursive resolver that performs DNSSEC validation and classifies responses as secure, insecure, bogus, or indeterminate. It may set AD for trusted clients when validation succeeds.
Read definitionVendor class
Client information identifying a vendor, device family, or functional class. Servers use it for matching policies and returning vendor-specific configuration.
Read definitionVendor option
A DHCP option or nested option whose meaning is defined by a vendor or enterprise namespace. Standardized enterprise-number containers reduce collisions compared with uncoordinated private codes.
Read definitionView
A server configuration that selects a set of zones, recursion behavior, or policy according to the client or request context. The same queried name can therefore receive different answers.
Read definitionVIP
Virtual IP address, a service address presented by a cluster, load balancer, HA pair, or other abstraction rather than tied permanently to one interface.
Read definitionVLAN
Virtual LAN, a Layer 2 broadcast-domain segmentation identified by a VLAN ID on Ethernet networks. A VLAN often maps to one or more IP subnets, but the relationship is not inherently one-to-one.
Read definitionVLAN pool
A defined set or range of VLAN IDs available for allocation to domains or encapsulations. In Cisco ACI, VLAN pools are associated with physical or virtual domains and AAEP policy.
Read definitionVNI
Virtual Network Identifier, a 24-bit VXLAN segment identifier. A VNI represents a logical overlay segment and can map to a bridge domain or tenant network.
Read definitionVRF
Virtual Routing and Forwarding, a separate routing-table context on a device or network. VRFs allow overlapping addresses and should be modeled explicitly in IPAM or network views.
Read definitionVRRP
Virtual Router Redundancy Protocol, which lets routers or appliances share a virtual IPv4 or IPv6 address and elect an active master. Some HA DDI systems use VRRP-like service VIP behavior.
Read definition