![]() It’s divided into seven layers, each performing specific functions. This model is a conceptual framework that describes how data is sent and received over a network. The reason for having both IP and MAC addresses lies in the way the Internet works, specifically in the structure of the OSI Model. ![]() Reason to Have Both IP and MAC Addresses. Frames that are destined with MAC address FF-FF-FF-FF-FF-FF will reach every computer belonging to that LAN segment. Ethernet frames with ones in all bits of the destination address (FF-FF-FF-FF-FF-FF) are referred to as the broadcast addresses. Broadcast: Similar to Network Layer, Broadcast is also possible on the underlying layer( Data Link Layer). IEEE has allocated the address block 01-80-C2-xx-xx-xx (01-80-C2-00-00-00 to 01-80-C2-FF-FF-FF) for group addresses for use by standard protocols.ģ. In Layer-2 (Ethernet) Multicast address, the LSB (least significant bit) of the first octet of an address is set to one. Multicast: The multicast address allows the source to send a frame to a group of devices. The MAC Address of the source machine is always Unicast.Ģ. If the LSB (least significant bit) of the first octet of an address is set to zero, the frame is meant to reach only one receiving NIC. Unicast: A Unicast-addressed frame is only sent out to the interface leading to a specific NIC. Software Engineering Interview Questionsġ.Top 10 System Design Interview Questions and Answers.Top 20 Puzzles Commonly Asked During SDE Interviews.Commonly Asked Data Structure Interview Questions.Top 10 algorithms in Interview Questions.Top 20 Dynamic Programming Interview Questions.Top 20 Hashing Technique based Interview Questions.Top 50 Dynamic Programming (DP) Problems.Top 20 Greedy Algorithms Interview Questions.Top 100 DSA Interview Questions Topic-wise.
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