Duties of IEEE 802.2 Logical Link Control (LLC) -Study Notes for PSC, SSC, and VSSC IT Officer Exams

Welcome to the Computer Science and Technology Study Materials section from CoreNetworkZ EdTech Solutions, a leading mock test and competitive exam preparation platform, for students preparing for SSC, DSSSB, and Kerala PSC examinations. Today, I will explain the duties of IEEE 802.2 Logical Link Control (LLC).

I have trained the Network Engineers in CoreNetworkZ EdTech Solutions for seven years. Logical Link Control (LLC) is one of the fundamental concepts in my training section. Today, I explain the LLC and its duties.

In IEEE's version of Ethernet, the top sublayer of the Data link layer is Logical Link Control(LLC).

LLC' performs its functions in the software part of the Data Link Layer. LLC defines how to multiplex multiple network layer protocols in the data link layer frames. So, any logical operation in the Data Link Layer is happening in LLC.

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Understanding the duties of IEEE 802.2 Logical Link Control (LLC) is essential for candidates appearing for the DSSSB PGT/TGT Computer Science, Kerala PSC Degree Level Exam, SSC Scientific Assistant (CS), VSSC Technical Assistant, and System Analyst posts. These networking fundamentals are core parts of the Computer Science syllabus.

Kerala PSC Degree Level examinations have a Computer Science section where students can expect questions from the duties of IEEE 802.2 Logical Link Control (LLC). You can check the Kerala PSC Degree Level Common Prelims Syllabus under the Computer Science section. I recommend you download the syllabus using this official link.

Reference: https://www.keralapsc.gov.in/sites/default/files/2021-02/syllubus.pdf

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Let us check the IEEE definition of Logical Link Control(LLC). Logical Link Control sublayer comes under IEEE 802.2. Ronald asked me in the comment section about the types of LLC frames. There are two types of IEEE 802.2 frames. They are:

1. Service Access Point(SAP)
   
   
2. Subnetwork Access Protocol(SNAP)

Logic Link Control (LLC) has a few duties in the OSI reference model. Let us check them.

Lijo John asked me about the duties of the LLC. The duties of the Logical Link control are:

1. Multiplex multiple network layer protocols into frames.

2. The second duty is Sequencing and flow control.

IEEE 802.2 uses the SAP(Service Access Point) or SNAP(Subnetwork Access Protocol) field to differentiate between encapsulated layer three payloads.

IEEE 802.2 (LLC) concerns Ethernet, Token Ring, and FDDI. To read more about the MAC sublayer, visit the link below.

Though LLC can do the sequencing and flow control, the Transport layer does it better. Let me explain how different the LLC and Transport Layer are in sequencing and flow control. LLC is limited to the same LAN. It does not work outside the LAN.

1. https://www.keralapsc.gov.in/sites/default/files/2021-02/syllubus.pdf
2. https://www.cisco.com/c/en/us/support/docs/ibm-technologies/logical-link-control-llc/12247-45.html