Layer 2 of the OSI model has two sublayers. What are those sublayers, and what are two IEEE standards that describe technologies at that layer?

A.
LCL and MAC; IEEE 802.2 and 802.3

B.
LCL and MAC; IEEE 802.1 and 802.3

C.
Network and MAC; IEEE 802.1 and 802.3

D.
LLC and MAC; IEEE 802.2 and 802.3

Explanation:
D: The data link layer, or Layer 2, of the OSI model is responsible for adding a header and a trailer to a packet to prepare the packet for the local area network or wide area
network technology binary format for proper line transmission. Layer 2 is divided into two functional sublayers. The upper sublayer is the Logical Link Control (LLC) and is
defined in the IEEE 802.2 specification. It communicates with the network layer, which is immediately above the data link layer. Below the LLC is the Media Access Control
(MAC) sublayer, which specifies the interface with the protocol requirements of the physical layer. Thus, the specification for this layer depends on the technology of the physical
layer. The IEEE MAC specification for Ethernet is 802.3, Token Ring is 802.5, wireless LAN is 802.11, and so on. When you see a reference to an IEEE standard, such as
802.11 or 802.16, it refers to the protocol working at the MAC sublayer of the data link layer of the protocol stack.
A is incorrect because LCL is a distracter. The correct acronym for the upper sublayer of the data link layer is LLC. It stands for the Logical Link Control. By providing
multiplexing and flow control mechanisms, the LLC enables the coexistence of network protocols within a multipoint network and their transportation over the same network
media.
B is incorrect because LCL is a distracter. The sublayers of the data link layer are the Logical Link Control (LLC) and the Media Access Control (MAC). Furthermore, the LLC
is defined in the IEEE 802.2 specification, not 802.1. The IEEE 802.1 specifications are concerned with protocol layers above the MAC and LLC layers. It addresses LAN/MAN
architecture, network management, internetworking between LANs and WANs, and link security, etc.
C is incorrect because network is not a sublayer of the data link layer. The sublayers of the data link layer are the Logical Link Control (LLC) and the Media Access Control
(MAC). The LLC sits between the network layer (the layer immediately above the data link layer) and the MAC sublayer. Also, the LLC is defined in the IEEE 802.2 specification,
not IEEE 802.1. As just explained, 802.1 standards address areas of LAN/MAN architecture, network management, internetworking between LANs and WANs, and link security.
The IEEE 802.1 group’s four active task groups are Internetworking, Security, Audio/Video Bridging, and Data Center Bridging.