DATA LINK LAYER WIRED NETWORKS
INTRODUCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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NIC
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Hub
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Router
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Switch
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Detailed explanation-1: -Layer 2 protocols or network L2 protocols are a list of communication protocols used by Layer 2 devices (such as network interface cards (NIC), switches, multiport bridges, etc.) to transfer data in a wide area network, or between one node to another in a local area network.
Detailed explanation-2: -The Cisco Catalyst 2950, Cisco 2960 series are typical examples of Layer 2 switches. The Cisco Catalyst 3550, 3560, 3750, 4500, 6500 series would be good examples of Layer 3 switches.
Detailed explanation-3: -Layer 2 switches are similar to bridges. They interconnect networks at layer 2, most commonly at the MAC sublayer, and operate as bridges, building tables for the transfer of frames among networks. Historically, layer 2 switches emerged to alleviate the contention problem of shared media LANs.
Detailed explanation-4: -There are three distinct functions of layer 2 switching (you need to remember these!): address learning, forward/filter decisions, and loop avoidance.