At which Layer would you use trace route to validate the path?

The correct answer is C. Layer 3. Traceroute operates at Layer 3 (Network Layer) because it works by manipulating the IP TTL (Time To Live) field to discover routers along a path - routers are Layer 3 devices, and IP addressing/routing is a Layer 3 concern. Layer 1 (Physical) deals only with raw signals and…

Troubleshoot Industrial Network Protocols

Question

Options

ALayer 1
BLayer 2
CLayer 3
DLayer 4

How the community answered

(38 responses)

B
3% (1)
C
92% (35)
D
5% (2)

Explanation

Traceroute operates at Layer 3 (Network Layer) because it works by manipulating the IP TTL (Time To Live) field to discover routers along a path - routers are Layer 3 devices, and IP addressing/routing is a Layer 3 concern. Layer 1 (Physical) deals only with raw signals and cables, with no concept of paths or addressing. Layer 2 (Data Link) uses MAC addresses for local segment delivery, not end-to-end routing across networks. Layer 4 (Transport) handles TCP/UDP ports and connections, but traceroute's core mechanism is IP-based, not transport-layer - even though some implementations use UDP or TCP probes, the path discovery itself is an IP (Layer 3) function.

Memory tip: Think "Route = Layer 3" - traceroute has "route" in the name, and routing is the defining function of Layer 3.

Topics

#OSI Model#Layer 3 (Network)#Traceroute#Routing Diagnostics

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