📖 11. Data Link Control (DLC)

📖 From Data Communication and Networks • 227 questions available

About 11. Data Link Control (DLC)

Data Link Control protocols manage the orderly exchange of frames between two directly connected nodes, implementing flow control to prevent fast senders from overwhelming slow receivers. Stop-and-Wait ARQ is the simplest method but inefficient for high-bandwidth-delay products, while Go-Back-N and Selective Repeat ARQ allow multiple outstanding frames with sliding windows, dramatically improving throughput by keeping the pipe full and selectively retransmitting only corrupted or lost frames.

These protocols also handle sequencing, acknowledgment, timeout management, and piggybacking of ACKs onto reverse traffic, creating a reliable byte-stream service atop unreliable physical links. HDLC and PPP are classic examples that standardize frame formats and negotiation procedures, demonstrating how DLC abstracts physical diversity into uniform interfaces, enabling interoperable communication across serial lines, dial-up connections, and modern tunneling scenarios.

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🔄 Last updated: 2026-08-01