The data link layer help me to learn about Enables upper layers to access the media. The upper layer protocol is completely unaware of the type of media that is used to forward the data. Accepts data, usually Layer 3 packets (i.e., IPv4 or IPv6), and encapsulates them into Layer 2 frames.
while the module 7 contains a lab using Wireshark in which I can see at Ethernet frames and another lab where I view network device MAC addresses. There are also some instructional videos to help me better understand Ethernet.
6.1.5 Check Your Understanding - Purpose of the Data Link Layer
6.2.9 Check Your Understanding - Topologies
6.3.5 Check Your Understanding - Data Link Frame
6.4.2 Module Quiz - Data Link Layer
7.1.5 Check Your Understanding - Ethernet Switching
7.2.7 Lab - View Network Device MAC Addresses
7.3.7 Lab - View the Switch MAC Address Table
7.4.6 Check Your Understanding - Switch Speeds and Forwarding Methods
7.5.2 Module Quiz - Ethernet Switching