Answer:
Data Link Layer- The second layer of the OSI model, responsible for node-to-node delivery.
OSI stands for Open Systems Interconnection model
Explanation:
The OSI model is a conceptual framework that is used to describe how a network functions. In another words, the OSI model helped standardize the way computer systems send information to each other.
Nodes
A node is a physical electronic device hooked up to a network, for example a computer, printer, router, and so on. If set up properly, a node is capable of sending and/or receiving information over a network.
Nodes may be set up adjacent to one other, wherein Node A can connect directly to Node B, or there may be an intermediate node, like a switch or a router, set up between Node A and Node B.
Typically, routers connect networks to the Internet and switches operate within a network to facilitate intra-network communication.
Links
Links connect nodes on a network. Links can be wired, like Ethernet, or cable-free.
Links to can either be point-to-point, where Node A is connected to Node B, or multipoint, where Node A is connected to Node B and Node C.
When we’re talking about information being transmitted, this may also be described as a one-to-one vs. a one-to-many relationship.
Networks
A network is a general term for a group of computers, printers, or any other device that wants to share data.
OSI MODEL:OSI stands for Open System Interconnection is a reference model that describes how information from a software application in one computer moves through a physical medium to the software application in another computer.
OSI consists of seven layers, and each layer performs a particular network function.
How to remember all the names of the layers? Easy.
- Please | Physical Layer
- Do | Data Link Layer
- Not | Network Layer
- Tell (the) | Transport Layer
- Secret | Session Layer
- Password (to) | Presentation Layer
- Anyone | Application Layer
Physical Layer(Layer 1):
The lowest layer of the OSI reference model is the physical layer. It is responsible for the actual physical connection between the devices. The physical layer contains information in the form of bits. It is responsible for transmitting individual bits from one node to the next.
Data Link Layer (Layer 2):
The data link layer is responsible for the node-to-node delivery of the message. The main function of this layer is to make sure data transfer is error-free from one node to another, over the physical layer.
Network Layer (Layer 3) :
The network layer works for the transmission of data from one host to the other located in different networks. It also takes care of packet routing i.e. selection of the shortest path to transmit the packet, from the number of routes available. The sender & receiver’s IP addresses are placed in the header by the network layer.
Transport Layer (Layer 4) :
The transport layer provides services to the application layer and takes services from the network layer. The data in the transport layer is referred to as Segments. It is responsible for the End to End Delivery of the complete message.
Session Layer (Layer 5) :
This layer is responsible for the establishment of connection, maintenance of sessions, authentication, and also ensures security.
Presentation Layer (Layer 6):
The presentation layer is also called the Translation layer. The data from the application layer is extracted here and manipulated as per the required format to transmit over the network.
Application Layer (Layer 7) :
At the very top of the OSI Reference Model stack of layers, we find the Application layer which is implemented by the network applications. These applications produce the data, which has to be transferred over the network. This layer also serves as a window for the application services to access the network and for displaying the received information to the user.
Example: Application – Browsers, Skype Messenger, etc.
