The Logical Link Control sub-layer is a part of which of the following?

The Open Systems Interconnection (OSI) model's Data Link layer (Layer 2) is divided into two distinct sub-layers: the Logical Link Control (LLC) and the Media Access Control (MAC). The LLC sub-layer, standardized as IEEE 802.2, acts as the upper portion of the Data Link layer. Its primary functions are to provide an interface to the Network layer (Layer 3), multiplex protocols running over the MAC layer, and optionally provide flow control and error control. It allows different network layer protocols to operate over the same network interface and media.

B. The Reference monitor is an abstract security concept for an operating system kernel that enforces access control, not a network layer.

C. The Transport layer (Layer 4) is responsible for end-to-end communication and data segmentation (e.g., TCP/UDP), which is a different function from the LLC at Layer 2.

D. Change management control is a formal administrative process for managing and controlling changes to IT systems, unrelated to network protocol architecture.

1. IEEE Standards Association. (2014). IEEE Standard for Local and Metropolitan Area Networks: Overview and Architecture. IEEE Std 802-2014. Section 6.2.3

"Relationship of IEEE 802 standards to the ISO/IEC OSI basic reference model

" explicitly shows the LLC and MAC sublayers residing within the Data Link Layer of the OSI model.

2. Stallings

W. (2014). Data and Computer Communications (10th ed.). Pearson Education. In Chapter 15

"Local Area Network Overview

" Section 15.2

"LAN Protocol Architecture

" Figure 15.2 clearly illustrates the IEEE 802 protocol architecture

positioning the Logical Link Control (LLC) as a sublayer of the Data Link Layer

situated above the Media Access Control (MAC) sublayer.

3. Kurose

J. F.

& Ross

K. W. (2017). Computer Networking: A Top-Down Approach (7th ed.). Pearson Education. Chapter 6

"The Link Layer: Links

Access Networks

and LANs

" discusses the services and structure of the link layer

explaining its division into sublayers for LAN technologies.