Term 511
Registered Jack Function 45
An RJ45 connector is the clear plastic plug at the end of an Ethernet cable that connects computers, routers, and switches to form a wired network.
Acronym study
Terms 511–540 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 511
An RJ45 connector is the clear plastic plug at the end of an Ethernet cable that connects computers, routers, and switches to form a wired network.
Term 512
Remote Desktop Protocol is a technology that lets you connect to and control another computer from a different location, as if you were sitting in front of it.
Term 513
A REST API is a set of rules that allows different software applications to communicate with each other over the internet using standard HTTP methods.
Term 514
RESTCONF is a protocol that uses HTTP methods to manage and configure network devices, replacing older command-line methods with a modern web-based approach.
Term 515
Restrict mode is a port security violation action on a managed switch that allows the port to stay active and forward traffic for authorized devices, but discards traffic from unauthorized devices while logging the violation.
Term 516
RIP (Routing Information Protocol) is a distance-vector routing protocol that routers use to exchange information about network paths to determine the best route for data packets based on hop count.
Term 517
RJ45 is a standardized physical connector used to plug Ethernet cables into computers, routers, switches, and other networking devices.
Term 518
A rogue access point is an unauthorized wireless access point installed on a network without the network administrator's knowledge or permission, creating a serious security vulnerability.
Term 519
A Rogue Access Point is an unauthorized wireless access point connected to a network without the network administrator's permission, creating a serious security vulnerability.
Term 520
ROMMON is the low-level firmware stored in the router's ROM that provides a minimal operating system for booting the device, password recovery, and troubleshooting when the main IOS image is missing or corrupted.
Term 521
The root bridge is the central reference point in a Spanning Tree Protocol (STP) network, serving as the logical root of the spanning tree topology.
Term 522
Root Guard is a Spanning Tree Protocol (STP) feature that protects the root bridge placement on a network port to prevent unauthorized switches from becoming the root bridge.
Term 523
A root port is the port on a non-root switch in a Spanning Tree Protocol network that has the lowest cost path to the root bridge.
Term 524
A route is a path that data takes through a network from one device or network to another, determined by routing protocols and configured rules.
Term 525
Route 53 is Amazon Web Services’ cloud-based Domain Name System (DNS) web service that translates human-readable domain names into IP addresses and routes end-user requests to internet applications.
Term 526
Route summarization is a technique that combines multiple network routes into a single, more general route advertisement to reduce the size of routing tables and improve network performance.
Term 527
A route table is a set of rules, called routes, that determine where network traffic from a subnet or virtual network is directed.
Term 528
A router is a networking device that connects different networks together and directs data traffic between them by choosing the best path for data to travel.
Term 529
A Router Advertisement is a message sent by a router on a network to inform devices about the router's presence and provide them with essential configuration information for communication.
Term 530
The Router ID is a unique 32-bit identifier assigned to a router running the OSPF routing protocol, used to distinguish it from other routers in the network.
Term 531
A router-on-a-stick is a network configuration where a single router interface is used to route traffic between multiple VLANs by connecting to a switch through a trunk link.
Term 532
Routing Information Protocol (RIP) is a distance-vector routing protocol that routers use to exchange information about network paths, using hop count as its metric to find the shortest route.
Term 533
A routing table is a data set stored in a router or host that contains information about network paths and is used to determine where to forward data packets.
Term 534
RSA is a cryptographic algorithm that uses a pair of keys—a public key and a private key—to secure data in transit and verify identities.
Term 535
RSTP (Rapid Spanning Tree Protocol) is a network protocol that quickly detects and recovers from link failures in Ethernet networks to prevent loops and ensure fast convergence.
Term 536
rsync is a command-line tool that synchronizes files and directories between two locations efficiently by transferring only the differences.
Term 537
Safe Mode is a diagnostic startup mode in operating systems that loads only essential drivers and services, allowing users to troubleshoot and fix problems caused by non-critical software or hardware.
Term 538
Salting is the process of adding a unique, random string of data to each password before it is hashed, so that even identical passwords produce completely different hash values.
Term 539
Satellite internet is a type of internet connection that uses satellites orbiting the Earth to send and receive data, allowing users in remote or rural areas to get online.
Term 540
SCP (Secure Copy Protocol) is a network protocol used to securely transfer files between computers over an encrypted SSH connection.