Cisco Networks: Engineers' Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA

© Chris Carthern and William Wilson and Noel Rivera 2021

C. Carthern et al.Cisco Networkshttps://doi.org/10.1007/978-1-4842-6672-4_3

3. Data Link Layer

Chris Carthern¹  , William Wilson² and Noel Rivera³

(1)

Bangkok, Krung Thep, Thailand

(2)

FPO, AP, USA

(3)

APO, AE, USA

 

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 ...