Term 301
IPv6 address
An IPv6 address is a 128-bit numeric label used to identify a device on an Internet Protocol network, designed to replace IPv4 due to the exhaustion of available addresses.
Acronym study
Terms 301–330 of 716 CCNA acronyms and key terms. Each entry includes a plain-English definition and a link to the full 800-word glossary page with exam context and practice questions.
Term 301
An IPv6 address is a 128-bit numeric label used to identify a device on an Internet Protocol network, designed to replace IPv4 due to the exhaustion of available addresses.
Term 302
An IPv6 global unicast address is a public, globally unique IP address assigned to a single network interface, allowing direct communication over the Internet.
Term 303
An IPv6 link-local address is a self-assigned, non-routable address used for communication between devices on the same network segment without needing a central server.
Term 304
IS-IS is a link-state routing protocol used in large IP and OSI networks, known for its fast convergence and hierarchical design.
Term 305
An ISP is a company that provides individuals and organizations access to the Internet, along with related services like email and web hosting.
Term 306
Jitter is the unwanted variation in the delay of data packet delivery over a network, causing inconsistent communication timing.
Term 307
Journalctl is a command-line tool used to view and query logs collected by the systemd journal, which stores system and application messages on Linux systems.
Term 308
JSON is a lightweight, text-based format for storing and exchanging data that is easy for humans to read and write and easy for machines to parse and generate.
Term 309
Key escrow is a system where cryptographic keys are stored securely with a third party so that authorized parties can access encrypted data when the original key holder is unavailable or when lawful access is required.
Term 310
Key management is the process of creating, storing, distributing, using, rotating, and destroying cryptographic keys securely throughout their entire lifecycle.
Term 311
Key rotation is the process of replacing an old cryptographic key with a new one to maintain security and limit the damage from a potential key compromise.
Term 312
Key stretching is a technique that makes a weak password or key stronger by processing it through a slow, resource-intensive function to deter brute-force attacks.
Term 313
KMS (Key Management Service) is a Microsoft technology that automates volume licensing activation for Windows and Office products within an organization's network.
Term 314
A KVM switch is a hardware device that allows you to control multiple computers from a single keyboard, monitor, and mouse.
Term 315
LACP is a protocol that automatically combines multiple physical network links into a single logical link to increase bandwidth and provide redundancy.
Term 316
Local Area Network — a network confined to a single physical location such as an office, building, or campus.
Term 317
The last assignable IP address in a subnet, which is one less than the broadcast address.
Term 318
Latency is the time delay between a request being sent over a network and the response being received, often measured in milliseconds.
Term 319
Latency routing is a DNS-based traffic management method that directs user requests to the server location which can provide the lowest network latency for that specific user.
Term 320
A Layer 2 switch is a network device that forwards data frames based on the MAC addresses found in the frame headers, operating within a single local area network segment.
Term 321
A network device that combines the high-speed switching of a Layer 2 switch with the routing capabilities of a router, allowing it to forward traffic based on both MAC and IP addresses.
Term 322
In Spanning Tree Protocol (STP), the learning state is a temporary port state where the switch builds its MAC address table from incoming frames but does not yet forward user data, ensuring no loops are formed.
Term 323
A dedicated, uncontended telecommunications circuit rented from a service provider that provides a fixed, symmetrical bandwidth connection between two locations.
Term 324
A lifecycle rule is a set of automated policies that move or delete data based on its age or other conditions, helping manage storage costs and compliance.
Term 325
Link aggregation combines multiple physical network connections into a single logical link to increase bandwidth and provide redundancy.
Term 326
Link Aggregation Control Protocol (LACP) is a standard protocol that automatically bundles multiple physical network links into a single logical link to increase bandwidth and provide redundancy.
Term 327
Link Layer Discovery Protocol (LLDP) is a vendor-neutral protocol used by network devices to advertise their identity, capabilities, and neighbors over a local area network.
Term 328
A link-local address is a network address that is automatically assigned to a device for communication only within a single network segment, without needing a router or external server.
Term 329
A transitional state in the Spanning Tree Protocol where a port listens for Bridge Protocol Data Units (BPDUs) to learn the network topology but does not forward or learn MAC addresses.
Term 330
LLDP (Link Layer Discovery Protocol) is a vendor-neutral protocol used by network devices to advertise their identity, capabilities, and neighbors on a local Ethernet network.