Computer Networks, unit: The Data Link Layer. Core concepts, terminology, and worked-example cues a college student meets for this unit, building on prior units without repeating them. Front: a term, concept, or short problem cue. Back: the definition, explanation, or answer.
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- What is the Data Link layer responsible for?
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Reliable node-to-node data transfer across a single network link- What is a MAC address?
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A unique hardware identifier assigned to a network interface card- What is framing, at the Data Link layer?
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Organizing a stream of bits into discrete units called frames with defined boundaries- What is error detection at the Data Link layer used for?
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Identifying corrupted data introduced during transmission- What is a checksum?
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A calculated value used to verify data integrity, detecting transmission errors- What is Cyclic Redundancy Check (CRC)?
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A common error-detection method using polynomial division to catch transmission errors- What is flow control?
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Managing the rate of data transmission to prevent overwhelming the receiver- What is a switch, as a Data Link layer device?
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A device that forwards frames to the correct device based on MAC address- What is a collision, in networking?
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When two devices transmit data on a shared medium at the same time, corrupting both signals- What is CSMA/CD (Carrier Sense Multiple Access with Collision Detection)?
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A method where devices check if the medium is free before sending, and detect and handle collisions- What is CSMA/CA (Collision Avoidance)?
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A method, common in wireless networks, where devices try to avoid collisions before they happen- What is Ethernet?
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A widely used set of Data Link and Physical layer technologies for wired LANs- What is a VLAN (Virtual LAN)?
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A logically segmented network created within a physical network, isolating traffic groups- What is the difference between a hub and a switch?
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A hub broadcasts to all ports; a switch intelligently forwards data only to the intended recipient- What is ARP (Address Resolution Protocol)?
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A protocol that maps an IP address to its corresponding MAC address on a local network
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