What is encapsulation at the data link layer?

What is encapsulation at the data link layer?

The term encapsulation describes a process of putting headers (and sometimes trailers) around some data. Each layer adds its own header (Data Link protocols also add a trailer) to the data supplied by the higher layer. The encapsulated data will then be forwarded to the next layer, the Transport layer.

What are two services performed by the data link layer?

Specifically the data link layer performs two basic services: It accepts Layer 3 packets and encapsulates them into frames. It provides media access control and performs error detection.

Which protocol’s is are used in data link layer of an OSI model?

Examples of data link protocols are Ethernet, Point-to-Point Protocol (PPP), HDLC and ADCCP. In the Internet Protocol Suite (TCP/IP), the data link layer functionality is contained within the link layer, the lowest layer of the descriptive model, which is assumed to be independent of physical infrastructure.

At which layer of the OSI model would a logical address be added during encapsulation?

Logical addresses, also known as IP addresses, are encapsulated at the network layer. Physical addresses are encapsulated at the data link layer. Port addresses are encapsulated at the transport layer.

Why is the encapsulation process important for the data link layer?

Data encapsulation adds the protocol information to the data so that data transmission can take place in a proper way. This information can either be added in the header or the footer of the data. The data is encapsulated on the sender’s side, starting from the application layer to the physical layer.

What is the main function of data link layer?

The data link layer is the second layer in the OSI Model. The three main functions of the data link layer are to deal with transmission errors, regulate the flow of data, and provide a well-defined interface to the network layer.

What are the types of data link layer?

The data link layer (Layer 2) of the OSI model actually consists of two sublayers: the Media Access Control (MAC) sublayer and the Logical Link Control (LLC) sublayer.

Which two OSI model layers have the same?

Answers Explanation & Hints: The OSI transport layer is functionally equivalent to the TCP/IP transport layer, and the OSI network layer is equivalent to the TCP/IP internet layer. The OSI data link and physical layers together are equivalent to the TCP/IP network access layer.

What type of delivery uses data link layer addresses?

What type of delivery uses data link layer addresses? If a device is sending frames to another device on the same local network, it uses ARP to determine the MAC address of the receiving device. The sending device then uses the Layer 2 addresses to send the frames.

How are protocols encapsulated at the network layer?

Therefore, we have ONLY 2 Protocols to Encapsulation with at the Network Layer: IPv4 and IPv6, but at the Data Link Layer, there is no logical Addressing system, rather, it is Burned-in Address system such Ethernet MAC Addresses, PPP, HDLC, or Frame Relay Hardware Addressing, hence, each Technology uses different protocol to Frame IP Packets.

Why does Data Link Layer 2 use different protocols?

Since the Electronic Encoding of bits in each WAN technology is different, then cables, protocols, and encapsulation will be different. That’s explains why Layer 2 uses different set of protocols for different type of cables when it encapsulate frames. You will rarely see Frame Relay, HDLC, or PPP being used anymore.

How is the data link layer insulated from media transitions?

For the final link, the packet will use a wireless data link frame from the router to the laptop. The Data Link layer effectively insulates the communication processes at the higher layers from the media transitions that may occur end-to-end.

What is another name for the OSI data link layer?

What is another name for the OSI data link layer? The IEEE 802 LAN/MAN data link layer consists of which two sublayers? (Choose two.) Nice work!