Term 391
netstat
netstat (network statistics) is a command-line tool that displays active network connections, listening ports, routing tables, and network protocol statistics on a computer.
Acronym study
Terms 391–420 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 391
netstat (network statistics) is a command-line tool that displays active network connections, listening ports, routing tables, and network protocol statistics on a computer.
Term 392
A Network Access Analyzer is a security tool that monitors and analyzes who and what is trying to connect to a network, checking for unauthorized access and policy violations.
Term 393
A Network ACL is a virtual firewall that controls inbound and outbound traffic at the subnet level in a cloud network, acting as a stateless packet filter.
Term 394
A network address is a unique identifier that allows devices to find and communicate with each other on a computer network.
Term 395
Network Address Translation (NAT) is a method that allows multiple devices on a local network to share a single public IP address to access the internet.
Term 396
Network Functions Virtualization (NFV) is a way to replace specialized hardware network devices with software running on standard servers to make networks more flexible and cheaper to manage.
Term 397
A Network Interface Card (NIC) is a hardware component that allows a computer or device to connect to a network and communicate with other devices.
Term 398
A Network Load Balancer is a cloud service that automatically distributes incoming network traffic across multiple servers to ensure applications remain fast, available, and secure.
Term 399
Network monitoring is the practice of continuously observing a computer network for issues like slow performance, failures, or security threats to keep it running smoothly and reliably.
Term 400
A network profile is a collection of settings that defines how a device connects to and behaves on a specific type of network, such as public, private, or domain networks.
Term 401
A Network Security Group is a set of rules that controls inbound and outbound traffic to Azure resources like virtual machines and subnets.
Term 402
Network segmentation is the practice of dividing a computer network into smaller, isolated parts to improve performance, contain security threats, and simplify management.
Term 403
Network Time Protocol (NTP) is a networking protocol that synchronizes the clocks of computers and devices over a network to a common reference time source, typically Coordinated Universal Time (UTC).
Term 404
Network topology is the physical or logical arrangement of devices, cables, and data paths in a computer network.
Term 405
NetworkManager is a software utility in Linux-based operating systems that simplifies the management of network connections by automatically handling configuration, switching, and connectivity tasks for both wired and wireless networks.
Term 406
A next hop is the next immediate router or device that a packet is sent to on its path from source to destination.
Term 407
Near Field Communication is a short-range wireless technology that lets two devices exchange data when they are held close together, typically within a few centimeters.
Term 408
Network File System (NFS) is a protocol that allows a computer to access files over a network as if they were on its own local hard drive.
Term 409
nftables is a modern Linux kernel packet classification framework that replaces the older iptables, ip6tables, arptables, and ebtables tools for configuring network packet filtering, NAT, and firewall rules.
Term 410
NFV virtualizes network services like firewalls and routers, decoupling them from proprietary hardware to run as software on standard servers.
Term 411
A NIC is a hardware component that connects a computer to a network, enabling communication over wired or wireless media.
Term 412
nmcli is a command-line tool used in Linux to manage network connections, devices, and settings through NetworkManager.
Term 413
Non-repudiation is a security principle that ensures a party in a digital transaction cannot deny their involvement or the authenticity of their digital signature.
Term 414
A northbound API is an interface that allows higher-level software components, such as network management or orchestration platforms, to communicate with and control lower-level network devices like switches and routers.
Term 415
An NSG rule is a set of security rules in Microsoft Azure that controls whether network traffic is allowed or denied to and from Azure resources.
Term 416
Network Time Protocol is a networking protocol used to synchronize the clocks of computers and devices over a network to a common time reference.
Term 417
A numbered ACL is an access control list on a router or firewall that uses a number to identify the list and define rules for permitting or denying traffic based on source and destination IP addresses, ports, and protocols.
Term 418
OCSP (Online Certificate Status Protocol) is a method used to check whether a digital certificate is still valid or has been revoked in real time.
Term 419
Offline files are copies of network files stored locally on a device so they remain accessible even when the network is unavailable.
Term 420
OOB (Out-of-Band Management) is a method of managing network devices using a dedicated, separate network path that does not carry production traffic.