Computer Networking: Data Link Layer | Free Online Course | Alison

FLASH SALE: 25% Off Certificates and Diplomas! Sale ends on Friday, 23rd October 2020

Claim My 25% Discount

Computer Networking: Data Link Layer

In this free online course, learn about computer networking in the data link layer of the TCP/IP protocol stack.

Network and Security
Free Course
In this free online course, learn about computer networking and specifically the data link layer, which is one of the predominant layers in the protocol stack. The various LLC services in this layer are discussed, along with the MAC frame format. How you can manage flow and error control is also explained. Boost your computer networking knowledge and skills, by studying this specialized course.
  • Duration

    5-6 Hours
  • Assessment

  • Certification

  • Responsive

  • Publisher






View course modules


In this free online course, you are introduced to the world of computer networking particularly focusing on the data link layer. You will explore the two sub-layers of the data link layer, as well as the features of the Ethernet protocol and the flexibility that organizations get from using VLANs. Demonstrations, problems, examples, and assessment questions in this instructor-led video-based course, are designed to provide you with a comprehensive foundation, which will enable you to take serious steps into understanding this section of the protocol stack.

The course begins by introducing you to the reasons why the data link layer is one of the predominant layers in the OSI TCP/IP protocol stack. Then the two sub-layers, which are the medium access control (MAC) layer and the logical link control (LLC) layer, are discussed to help you understand their uses in the network. You will explore the different ways of controlling access to a shared transmission medium and the collision detection process.

The course includes topics on LLC services, LAN protocols, MAC frame format, Ethernet technologies, collision detection, error and flow control mechanisms, ARP operation, RARP packet format, VLAN tagging, and more. This course will be of interest to computer engineering students, networking and programming professionals, or those looking to enhance their career prospects in the computer networking industry. Start this course here today.

Start Course Now

Learning Outcomes

Upon successful completion of this course, you should be able to:

  • Explain the LLC services, Ethernet frame, flow and error control
  • Discuss the communication model and network security policies
  • Describe the LLC services and asynchronous MAC techniques
  • Explain the generic MAC frame format and MAC protocols
  • Discuss ethernet technologies, multiple access methods, and collision detection
  • Describe the error and flow control mechanisms used in the data link layer
  • Discuss the encapsulation of ARP packets and the BOOTP packet format
  • Explain the DHCP exchanging messages and the RARP operation
  • Describe VLAN tagging, connecting LANs with bridges and wireless LAN protocols


All Alison courses are free to enrol, study and complete. To successfully complete this Certificate course and become an Alison Graduate, you need to achieve 80% or higher in each course assessment. Once you have completed this Certificate course, you have the option to acquire an official Certificate, which is a great way to share your achievement with the world. Your Alison Certificate is:

Ideal for sharing with potential employers - include it in your CV, professional social media profiles and job applications
An indication of your commitment to continuously learn, upskill and achieve high results
An incentive for you to continue empowering yourself through lifelong learning

Alison offers 3 types of Certificates for completed Certificate courses:

Digital Certificate - a downloadable Certificate in PDF format, immediately available to you when you complete your purchase
Certificate - a physical version of your officially branded and security-marked Certificate, posted to you with FREE shipping
Framed Certificate - a physical version of your officially branded and security-marked Certificate in a stylish frame, posted to you with FREE shipping

All Certificates are available to purchase through the Alison Shop. For more information on purchasing Alison Certificates, please visit our FAQs. If you decide not to purchase your Alison Certificate, you can still demonstrate your achievement by sharing your Learner Record or Learner Achievement Verification, both of which are accessible from your Dashboard. For more details on our Certificate pricing, please visit our Pricing Page.



    You have received a new notification

    Click here to view them all