Common Layer 1 issues include

Question

Options

• ARouting
• BDistribution
• CMAC addresses
• DLoose or bad cables

• B
  4% (1)
• C
  8% (2)
• D
  88% (22)

Explanation

Layer 1 (Physical Layer) deals with the actual hardware and physical transmission of raw bits - cables, connectors, electrical signals, and physical media. Loose or bad cables (D) directly disrupt this physical signal path, making them a classic and common Layer 1 problem alongside issues like damaged connectors, interference, and incorrect cabling.

Why the distractors are wrong:

• A. Routing - operates at Layer 3 (Network), involving logical addressing and path selection via IP
• B. Distribution - refers to a network design tier (Distribution layer), not an OSI layer; it's an architectural concept, not a Layer 1 issue
• C. MAC addresses - belong to Layer 2 (Data Link), used for local hardware addressing within a network segment

Memory tip: Think of Layer 1 as everything you can physically touch or trip over - cables, ports, transceivers, and signals. If you can stub your toe on it, it's probably Layer 1. Routing and MAC addresses live in software/firmware, so they're always higher layers.

No community discussion yet for this question.