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In Ethernet switching, which method waits for the entire frame to be received and performs a cyclic redundancy check (CRC) before forwarding it, ensuring high integrity but higher latency?
Cut-through switching
Fragment-free switching
Store-and-forward switching
Adaptive switching
Store-and-forward switching
Store-and-forward switching is a technique where the switch buffers the entire Ethernet frame before forwarding it to the destination. This method performs a Cyclic Redundancy Check (CRC) to ensure data integrity, though it introduces higher latency compared to other techniques.
Store-and-forward switching is a technique where the switch buffers the entire Ethernet frame before forwarding it to the destination. This method performs a Cyclic Redundancy Check (CRC) to ensure data integrity, though it introduces higher latency compared to other techniques.
The fundamental principles of data transmission integrity relate to the OSI model layer 2 (Data Link Layer), standardized by IEEE 802.3 Ethernet protocols.
Store-and-forward switching guarantees high data integrity by error-checking frames before they are sent.
The inherent latency in this method is due to the buffering time required for the entire frame arrival.
This technique is ideal for environments where network errors are frequent or traffic is high.
Cut-through switching forwards the frame as soon as the destination MAC address is read, reducing latency but risking the transmission of corrupted frames.
Fragment-free switching (modified cut-through) waits for the first 64 bytes of a frame to ensure collision detection before forwarding.
Adaptive switching dynamically selects between cut-through and store-and-forward based on the error rate of the network link.
Option C is the correct answer because it is the only method that mandates a complete frame check via CRC.
C is correct тАФ Store-and-forward switching prioritizes frame integrity over speed by fully processing the frame and checking for errors before forwarding.
In competitive exams, relate switching techniques to the OSI model; while physical switching happens at Layer 2, routing and error correction protocols are foundational to understanding network architecture in IT-based exams.