COMPUTER NETWORKS AND COMMUNICATIONS
NETWORK PROTOCOLS AND STANDARDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Layer 1-Physical
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Layer 2-Data Link
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Layer 3-Network
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Layer 4-Transport
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Layer 5-Application
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Detailed explanation-1: -Examples of data link protocols are Ethernet, the IEEE 802.11 WiFi protocols, ATM and Frame Relay. In the Internet Protocol Suite (TCP/IP), the data link layer functionality is contained within the link layer, the lowest layer of the descriptive model, which is assumed to be independent of physical infrastructure.
Detailed explanation-2: -Layer 2 Ethernet refers to the second layer of the OSI model, which is the data link layer of the network. Layer 2 is where data packets are encoded and decoded into bits. The protocol layer enables the transfer of data between adjacent network nodes in a network segment, such as a LAN.
Detailed explanation-3: -Layer 2 of the OSI model is known as the data link layer. The Layer 2 protocol you’re likely most familiar with is Ethernet. Devices in an Ethernet network are identified by a MAC (media access control) address, which is generally hardcoded to a particular device and doesn’t normally change.
Detailed explanation-4: -The data link layer (Layer 2) of the OSI model actually consists of two sublayers: the Media Access Control (MAC) sublayer and the Logical Link Control (LLC) sublayer. The MAC sublayer controls device interaction. The LLC sublayer deals with addressing and multiplexing.