In data communications: A single packet or unit of transmission at the data-link layer is referred to as what?
Computer Science
Computer Fundamentals
Difficulty: Easy
Choose an option
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ABlock
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BGroup
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CPath
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DFrame
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ENone of the above
Answer
Correct Answer: Frame
Explanation
Introduction / Context:The OSI model defines layers and the names of data units at each layer. At the data-link layer (Layer 2), network interface cards send and receive bounded units with headers and trailers.
Given Data / Assumptions:
- We are at the data-link layer, not the network or transport layers.
- Typical examples include Ethernet, 802.11, and PPP.
Concept / Approach:
The proper term for a data-link layer packet is a frame. Frames include addressing (MAC), control information, and a frame check sequence for error detection.
Step-by-Step Solution:
1) Identify the OSI layer: data-link.2) Recall units: bits (physical), frames (data-link), packets (network), segments (transport), data (application).3) Choose 'Frame' as the correct label.Verification / Alternative check:
Ethernet specifically defines an Ethernet frame with fields like Destination MAC, Source MAC, Type/Length, Payload, and FCS.
Why Other Options Are Wrong:
- Block/Group: generic terms, not OSI-specific.
- Path: refers to a route, not a data unit.
- None of the above: incorrect because 'Frame' is precise.
Common Pitfalls:
- Confusing network-layer 'packet' with data-link 'frame'.
Final Answer:
Frame.