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Lowest abstraction layer in the Internet protocol suite
networking, the link layer is the lowest layer in the Internet protocol suite, the networking architecture of the Internet. The link layer is the group of
Link_layer
OSI model layer for node-to-node data transfer
The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers
Data_link_layer
Protocol used by network devices for advertising their identity
The Link Layer Discovery Protocol (LLDP) is a link-layer protocol used by network devices for advertising their identity, capabilities, and neighbors on
Link_Layer_Discovery_Protocol
Framework for communication protocols used in IP networking
the layers are the link layer, containing communication methods for data that remains within a single network segment (link); the internet layer, providing
Internet_protocol_suite
Reference model for network communication
communication system are distinguished in seven abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
OSI_model
LattisNet LocalTalk L2F Layer 2 Forwarding Protocol L2TP Layer 2 Tunneling Protocol LLDP Link Layer Discovery Protocol LLDP-MED Link Layer Discovery Protocol
List of network protocols (OSI model)
List_of_network_protocols_(OSI_model)
Highest layer in network protocol models
An application layer is an abstraction layer that specifies the shared communication protocols and interface methods used by hosts in a communications
Application_layer
OSI model layer for physical data transmission
In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer: the layer most closely associated with
Physical_layer
Topics referred to by the same term
animated cat Link layer in computer networking ln (Unix), command-line program to create a link to a file Chainlink (blockchain), a cryptocurrency Link (Indonesia)
Link
OSI model layer for packet routing
In the seven-layer OSI model of computer networking, the network layer is layer 3. The network layer is responsible for packet forwarding including routing
Network_layer
Layer for end-to-end network communication
networking, the transport layer is an abstraction layer in the Internet protocol suite and the OSI model. The protocols of this layer provide end-to-end communication
Transport_layer
Unit of data on an Ethernet network
link layer protocol data unit and uses the underlying Ethernet physical layer transport mechanisms. In other words, a data unit on an Ethernet link transports
Ethernet_frame
Computer expansion bus standard
PCI Express is a layered protocol, consisting of a transaction layer, a data link layer, and a physical layer. The Data Link Layer is subdivided to include
PCI_Express
Sublayer of the Open Systems Interconnection model
the logical link control (LLC) data communication protocol layer is the upper sublayer of the data link layer (layer 2) of the seven-layer OSI model. The
Logical_link_control
Transmission of data at irregular intervals
modems older than V.2. Asynchronous communication at the data link layer or higher protocol layers is known as statistical multiplexing, for example Asynchronous
Asynchronous_communication
Group of internetworking methods in the TCP/IP suite
the link types. Such protocols belong to the link layer. Internet-layer protocols use IP-based packets. A common design aspect in the internet layer is
Internet_layer
Information exchange standards
application level. Each layer receives information from the layer above, processes it and passes it down to the next layer. Each layer adds encapsulation information
OSI_protocols
Communications protocol
exchange broadcast (slave-to-slave communication) The data link layer FDL (Field bus Data Link) servicesand protocols work with a hybrid access method that
Profibus
hostless system, directly to the Link Manager/ACL link. L2CAP's functions include: Multiplexing data between different higher layer protocols. Segmentation and
List_of_Bluetooth_protocols
Service layer in IEEE 802 network standards
logical link control (LLC) sublayer together make up the data link layer. The LLC provides flow control and multiplexing for the logical link (i.e. EtherType
Medium_access_control
Proprietary link layer protocol by Microsoft
Link Layer Topology Discovery (LLTD) is a proprietary link layer protocol for network topology discovery and quality of service diagnostics. Microsoft
Link_Layer_Topology_Discovery
Radio communication link
communication link between the two stations in mobile or wireless communication. The air interface involves both the physical and data link layers (layer 1 and
Air_interface
Data link layer communication protocol
In computer networking, Point-to-Point Protocol (PPP) is a data link layer (layer 2) communication protocol between two routers directly without any host
Point-to-Point_Protocol
Topics referred to by the same term
Look up layer or layers in Wiktionary, the free dictionary. Layer or layered may refer to: Layers (Kungs album) Layers (Les McCann album) Layers (Royce
Layer
2-wire serial data and power interface
eBUS specifications – physical layer / data-link layer V.1.3.1 (March 2007) Archived eBUS specifications – application layer V1.6.1 (March 2007) Archived
EBUS_(serial_buses)
Network protocol
Technical Overview Define the OSI seven-layer architecture model the physical layer, data link layer and application layer Network in addition to the signal
DeviceNet
Associates addresses in the layers of a networked device implementation
communication protocol for discovering the link layer address, such as a MAC address, associated with an internet layer address, typically an IPv4 address. The
Address_Resolution_Protocol
OSI model layer for communication sessions
In the seven-layer OSI model of computer networking, the session layer is layer 5. The session layer provides the mechanism for opening, closing and managing
Session_layer
Using multiple network connections in parallel to increase capacity and reliability
that combine multiple frequency bands. OSI layer 2 (data link layer, e.g. Ethernet frame in LANs or multi-link PPP in WANs, Ethernet MAC address) aggregation
Link_aggregation
Overview of and topical guide to the Internet
Internet standard – Request for Comments (RFC) – Internet protocol suite – Link layer – Address Resolution Protocol (ARP/InARP) – Neighbor Discovery Protocol
Outline_of_the_Internet
Network communications domain that is isolated at the data link layer
in a virtual network at the data link layer (OSI layer 2). A VLAN behaves like a virtual network switch or network link that can share the same physical
VLAN
Protocol for statefully assigning IPv6 addresses on an IPv6 network
January 2000, modulo 2³²) link-layer address The time component reduces the likelihood of collisions if the same link-layer address is reused on another
DHCPv6
IL2P (Improved Layer 2 Protocol) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur
Improved_Layer_2_Protocol
Security vulnerabilities of the network interface layer
The link layer is the lowest layer in the TCP/IP model. It is also referred to as the network interface layer and mostly equivalent to the data link layer
Link_layer_security
IEEE standards for local and metropolitan area networks
the OSI data link layer into two sub-layers: logical link control (LLC) and medium access control (MAC), as follows: Data link layer LLC sublayer MAC sublayer
IEEE_802
Protocol in the Internet protocol suite used with IPv6
nodes to determine and advertise an IPv6 address corresponding to a given link-layer address, similar to Inverse ARP for IPv4. The Secure Neighbor Discovery
Neighbor_Discovery_Protocol
Network protocol for industrial automation
strictly scheduled and highly deterministic. Due to the unique physical layer, common network sniffers such as Wireshark cannot be used to sniff ControlNet
ControlNet
Computer networking protocol
widely-deployed protocol for establishing a data link layer connection over an unreliable, point-to-point data link. L2TP provides a mechanism to multiplex and
Layer_2_Tunneling_Protocol
OSI model layer for data translation
In the seven-layer OSI model of computer networking, the presentation layer is layer 6 and serves as the data translator for the network. It is sometimes
Presentation_layer
Communications technology
band used can be selected from among standardized patterns. The data link layer manages quality of service and other control functions using control frames
Nessum
Standard for serial communication between devices without host computer
link layer, and ISO 11898-2 which covers the CAN physical layer for high-speed CAN. ISO 11898-3 was released later and covers the CAN physical layer for
CAN_bus
System for exchanging messages between computing systems
reported to the network layer. The exchange of data link units (including flow control) is defined by this layer. The physical layer describes details like
Communication_protocol
Dynamic table that maps network addresses to ports
table. At the data link layer, a FIB is most notably used to facilitate Ethernet bridging based on MAC addresses. Other data-link-layer technologies using
Forwarding_information_base
Smallest message entity exchanged using Internet Protocol version 6
segment of the higher-level transport layer protocol, but may be data for an internet layer (e.g., ICMPv6) or link layer (e.g., OSPF) instead. IPv6 packets
IPv6_packet
Open standard processor interconnection for data centers
protocols operate with a common link/transaction layer, which is separate from the CXL.io protocol link and transaction layer. CXL.cache and CXL.mem transmit
Compute_Express_Link
Standard for computer networking over a cable television system
options available at Open Systems Interconnection (OSI) layers 1 and 2—the physical and data link layers. Channel width: Downstream: All versions of DOCSIS
DOCSIS
Network routing scheme based on labels identifying paths
operates at a layer between traditional definitions of OSI Layer 2 (data link layer) and Layer 3 (network layer), and is often referred to as a layer 2.5 protocol
Multiprotocol_Label_Switching
Computer networking technique
the group. Network assisted multicast may be implemented at the data link layer using one-to-many addressing and switching such as Ethernet multicast
Multicast
Application-level throughput of a network
layer, network layer and sometimes data link layer protocol overhead is included in the throughput, but is excluded from the goodput. Transport layer
Goodput
Network that allows computers to share resources and communicate with each other
generally function at the lower three layers of the OSI model: the physical layer, the data link layer, and the network layer. A global area network (GAN) is
Computer_network
Processor interconnect developed by Intel
is the 80-bit flit, which has 8 bits for error detection, 8 bits for "link-layer header", and 64 bits for data. One 80-bit flit is transferred in two clock
Intel_QuickPath_Interconnect
Size of largest allowed packet on a network segment
network layer transaction. The MTU relates to, but is not identical to the maximum frame size that can be transported on the data link layer, e.g., Ethernet
Maximum_transmission_unit
Computer networking technology
higher-layer protocols trigger retransmission of lost frames. Per the OSI model, Ethernet provides services up to and including the data link layer. The
Ethernet
Electrical or optical properties between network devices
MAC layer and the logical link layer. An implementation of a specific physical layer is commonly referred to as PHY. The Ethernet physical layer has evolved
Ethernet_physical_layer
Unique identifier assigned to network interfaces
addresses are used in the medium access control protocol sublayer of the data link layer. As typically represented, MAC addresses are recognizable as six groups
MAC_address
Standard for vehicle-to-grid communications
15118-10: Physical layer and data link layer requirements for single-pair Ethernet ISO 15118-11: Physical layer and data link layer requirements for single-pair
ISO_15118
Logical identifier addressing a specific group of devices on a network
addressing can be used in the link layer (layer 2 in the OSI model), such as Ethernet multicast, and at the internet layer (layer 3 for OSI) for Internet Protocol
Multicast_address
Set of standards under development by the IEEE for real-time networking
retransmitting dropped packets at the transport layer, but there are no means to prevent congestion at the link layer. Data can be lost when the buffers are too
Time-Sensitive_Networking
consists of link layer and application layer formats. DF1 works over half duplex and full duplex modes of communication. Application layer message format
DF-1_Protocol
Networking hardware that forwards packets based on hardware address
forward data at the data link layer (layer 2) of the OSI model. Some switches can also forward data at the network layer (layer 3) by additionally incorporating
Network_switch
Network switch providing functionality above the data link layer
Multi-layer switching can make routing and switching decisions based on the following MAC address in a data link frame Protocol field in the data link frame
Multilayer_switch
Communications protocol standard in FM radio broadcasts
transport layers are excluded, as this is a unidirectional broadcast standard.) Data channel (Physical layer) Baseband coding (Data-link layer) Message
Radio_Data_System
Means of addressing all devices on a network with a single transmission
single device. For network layer communications, a broadcast address may be a specific IP address. At the data link layer on Ethernet networks, it is
Broadcast_address
Device or point within a network capable of creating, receiving, or transmitting data
area network (WAN), every LAN or WAN node that participates on the data link layer must have a network address, typically one for each network interface
Node_(networking)
Spacecraft communications network
electronics. SpaceWire replaced old PECL differential drivers in the physical layer of IEEE 1355 DS-DE by low-voltage differential signaling (LVDS). SpaceWire
SpaceWire
Field in Ethernet frames indicating which protocol is encapsulated in the payload
the payload of the frame and is used at the receiving end by the data link layer to determine how the payload is processed. The same field is also used
EtherType
Link layer communications protocol
The Aurora Protocol is a link layer communications protocol for use on point-to-point serial links. Developed by Xilinx, it is intended for use in high-speed
Aurora_(protocol)
Unit of information transmitted over a computer network
are: The Layer 4: transport layer PDU is the segment. The Layer 3: network layer PDU is the packet or the datagram. The Layer 2: data link layer PDU is
Protocol_data_unit
Communication protocol property
delivered in order. Although the lower-layer switching is connectionless, or it may be a data link layer or network layer switching mode, where all data packets
Connection-oriented communication
Connection-oriented_communication
Section of a computer network in which all nodes can broadcast to each other
network, in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment or it can be bridged
Broadcast_domain
Ethernet protocol
(commonly known as RJ45) and M12 are accepted. The standard Ethernet data link layer is extended by an additional bus scheduling mechanism, which guarantees
Ethernet_Powerlink
Group of all devices on the same wireless network
A service set forms a logical network of nodes operating with shared link-layer networking parameters; they form one logical network segment. A service
Service_set_(802.11_network)
Network protocol
Ethernet link layer protocol and hence allows communication between any two hosts in the same Ethernet broadcast domain. RoCE v2 is an internet layer protocol
RDMA_over_Converged_Ethernet
Obsolete computer networking protocol
(IPv4) address from a computer network, when all it has available is its link-layer or hardware address, such as a MAC address. The client broadcasts the
Reverse Address Resolution Protocol
Reverse_Address_Resolution_Protocol
Interface to data link layers on a Unix-like system
operating system level. It provides a raw interface to data link layers, permitting raw link-layer packets to be sent and received, and allows a userspace
Berkeley_Packet_Filter
Digital telecommunications protocol for voice, video, and data
second. In the Open Systems Interconnection (OSI) reference model data link layer (layer 2), the basic transfer units are called frames. In ATM, these frames
Asynchronous_Transfer_Mode
Communication protocol that allows connections between networks
The Internet Protocol (IP) is the network layer communications protocol in the Internet protocol suite for relaying datagrams across network boundaries
Internet_Protocol
Version 6 of the Internet Protocol
the IPv6 packet is assumed to be assured by both the link layer or error detection in higher-layer protocols, namely the Transmission Control Protocol
IPv6
Detection of half-working Ethernet links
Unidirectional Link Detection (UDLD) is a data link layer protocol from Cisco Systems to monitor the physical configuration of cables and detect unidirectional
Unidirectional_Link_Detection
Topics referred to by the same term
associated with the title Heaviside layer. If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended
Heaviside_layer
Cryptographic protocols for securing data in transit
Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network, such as the Internet.
Transport_Layer_Security
Professional network website
skills and professional reputation, adding a layer of social proof to their profile. Additionally, LinkedIn provides analytics that show profile views
Application running at the network layer and above
networking, a network service is an application running at the network layer and above, that provides data storage, manipulation, presentation, communication
Network_service
Interface technology communication architecture
UniPro, the OSI Physical Layer is split into two sublayers: Layer 1 (the actual physical layer) and Layer 1.5 (the PHY Adapter layer) which abstracts from
UniPro_protocol_stack
HTTP extension supporting TLS encryption
communication protocol is encrypted using Transport Layer Security (TLS) or, formerly, Secure Sockets Layer (SSL). The protocol is therefore also referred
HTTPS
Fourth version of the Internet Protocol
section. Typically, the link layer encapsulates IP packets in frames with a CRC footer that detects most errors. Many transport-layer protocols carried by
IPv4
Method of solving the Rubik's Cube
Layer-by-layer methods are a family of methods for solving the 3×3×3 Rubik's Cube. Such methods are the most frequently known as beginners' methods, as
Layer-by-layer_method
ISBN 978-0-470-17560-6. CCNA Exploration 4.0 5.0 Routing Protocols and Concepts Student Lab Manual. Cisco Press. The ISO model is used for layer names.
List of information technology initialisms
List_of_information_technology_initialisms
Amateur radio data communications protocol
AX.25 (Amateur X.25) is a data link layer protocol originally derived from layer 2 of the X.25 protocol suite and designed for use by amateur radio operators
AX.25
the maximum time which may elapse between two Link Layer data packets having been received before the link is considered to have been lost. The Peripheral
Asynchronous connection-oriented logical transport
Asynchronous_connection-oriented_logical_transport
Data transmission unit
at the data link layer. Frames are the result of the final layer of encapsulation before the data is transmitted over the physical layer. A frame is "the
Frame_(networking)
Family of wireless network protocols
stack. For internetworking purposes, Wi-Fi is usually layered as a link layer below the internet layer of the Internet Protocol. This means that nodes have
Wi-Fi
Network topology in which nodes are interconnected by network switches
memory access (DMA)-based architecture on top of a serial physical and link layer. In the Fibre Channel Switched Fabric (FC-SW-6) topology, devices are
Switched_fabric
between the protocol stack and the adapter driver. It resides in Layer 2, the Data Link layer, of the OSI model. This interface also enables one or more network
Open_Data-Link_Interface
Proprietary data link network protocol
Cisco Discovery Protocol (CDP) is a proprietary data link layer protocol developed by Cisco Systems in 1994 by Keith McCloghrie and Dino Farinacci. It
Cisco_Discovery_Protocol
Low-power, low-bandwidth wireless mesh network
specifies the lower protocol layers—the physical layer (PHY), and the media access control portion of the data link layer. The basic channel access mode
Zigbee
Information transmission rate expressed in bits per second
The physical layer net bitrate is the datarate measured at a reference point in the interface between the data link layer and physical layer, and may consequently
Bit_rate
Global system of connected computer networks
layer code is independent of the type of network that it is physically running over.[citation needed] At the bottom of the architecture is the link layer
Internet
Form of amateur radio data communications using the AX25 protocol
name, AX.25 defines both the physical and data link layers of the OSI model. (It also defines a network layer protocol, though this is seldom used.) Packet
Packet_radio
Formatted unit of data carried by a packet-switched network
network layer. A data unit at layer 2, the data link layer, is a frame. In layer 4, the transport layer, the data units are segments and datagrams. Thus
Network_packet
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