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Data Link Layer

Chris Carthern, William W. Wilson, Noel Rivera

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Abstract

This chapter discusses protocols associated with the data link layer and link layer functions. The protocols covered are the Address Resolution Protocol (ARP), Reverse Address Resolution Protocol (RARP), Link Layer Discovery Protocol (LLDP), and Cisco Discovery Protocol (CDP). As mentioned earlier, the data link layer must ensure that messages are transmitted to devices on a LAN using physical hardware addresses, and it also must convert packets sent from the network layer into frames to be sent out to the physical layer to transmit. The data link layer converts packets into frames, which adds a header that contains the device’s physical hardware source and destination addresses, flow control, and a footer with the checksum data (CRC). We are going to dive deeply into this layer.

About this research paper

What this paper is about

This chapter discusses protocols associated with the data link layer and link layer functions. The protocols covered are the Address Resolution Protocol (ARP), Reverse Address Resolution Protocol (RARP), Link Layer Discovery Protocol (LLDP), and Cisco Discovery Protocol (CDP). As mentioned earlier, the data link layer must ensure that messages are transmitted to devices on a LAN using physical hardware addresses, and it also must convert packets sent from the network layer into frames to be sent out to the physical layer to transmit. The data link layer converts packets into frames, which adds a header that contains the device’s physical hardware source and destination addresses, flow control, and a footer with the checksum data (CRC). We are going to dive deeply into this layer.

Why it matters

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Available abstract

This chapter discusses protocols associated with the data link layer and link layer functions. The protocols covered are the Address Resolution Protocol (ARP), Reverse Address Resolution Protocol (RARP), Link Layer Discovery Protocol (LLDP), and Cisco Discovery Protocol (CDP). As mentioned earlier, the data link layer must ensure that messages are transmitted to devices on a LAN using physical hardware addresses, and it also must convert packets sent from the network layer into frames to be sent out to the physical layer to transmit. The data link layer converts packets into frames, which adds a header that contains the device’s physical hardware source and destination addresses, flow control, and a footer with the checksum data (CRC). We are going to dive deeply into this layer.

Key concepts: Link layer, Data link layer, Checksum, Network layer, Header, Computer network, Computer science, Network packet

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