For each of these layers I am using references from books and learning materials I have used while at EKU.

Click on the 7 layers of projects above to see seven layers of projects.

Click on the 7 layers of security above to see seven layers of security issues.

Data Link layer, defines the rules for gathering and completing all the elements that make up a data frame and putting the whole thing together, so that it can be passed to a Physical-layer device and on to the network.

 

Meyers, Mike; Jonathan Weissman. Mike Meyers’ CompTIA Network+ Certification Passport, Fifth Edition (Exam N10-006) (Mike Meyers' Certification Passport) (p. 13). McGraw-Hill Education. Kindle Edition.