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?
- Reliable node-to-node data transfer across a single network link
- What is a MAC address?
- A unique hardware identifier assigned to a network interface card
- What is framing, at the Data Link layer?
- Organizing a stream of bits into discrete units called frames with defined boundaries
- What is error detection at the Data Link layer used for?
- Identifying corrupted data introduced during transmission
- What is a checksum?
- A calculated value used to verify data integrity, detecting transmission errors
- What is Cyclic Redundancy Check (CRC)?
- A common error-detection method using polynomial division to catch transmission errors
- What is flow control?
- Managing the rate of data transmission to prevent overwhelming the receiver
- What is a switch, as a Data Link layer device?
- A device that forwards frames to the correct device based on MAC address
- What is a collision, in networking?
- 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)?
- A method where devices check if the medium is free before sending, and detect and handle collisions
- What is CSMA/CA (Collision Avoidance)?
- A method, common in wireless networks, where devices try to avoid collisions before they happen
- What is Ethernet?
- A widely used set of Data Link and Physical layer technologies for wired LANs
- What is a VLAN (Virtual LAN)?
- A logically segmented network created within a physical network, isolating traffic groups
- What is the difference between a hub and a switch?
- A hub broadcasts to all ports; a switch intelligently forwards data only to the intended recipient
- What is ARP (Address Resolution Protocol)?
- A protocol that maps an IP address to its corresponding MAC address on a local network
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