Networking Devices: Identifying the Non-Networking Device Among Hub, Bridge, and Switch
To answer “Which device is not a networking device?” we first need clear definitions of the listed devices and how they participate in data communication on a network. A Hub and a Switch both operate to move frames within a local network. A Bridge also forwards frames between LAN segments at the data-link layer.
Therefore, among (i) Hub, (ii) Bridge, and (iii) Switch, all three are networking devices, so the correct choice is (iv) None of these.
Key learning terms: hub, bridge, switch, LAN.
Networking Hub vs Switch vs Router (Concept Overview)
Why Hub, Bridge, and Switch are all networking devices
At a high level, networking devices are those that enable communication by forwarding or managing data packets/frames across network segments.
- A Hub is a physical/data-link assisting device for Ethernet frames (though it does not intelligently filter traffic).
- A Bridge filters/forwards frames to reduce unnecessary traffic between segments.
- A Switch is more advanced than a bridge in typical Ethernet LAN designs, using a MAC address table for efficient forwarding.
So none of (i)-(iii) is “not a networking device.”
Answer Selection for the MCQ
- 1Step 1
Consider (i) Hub, (ii) Bridge, (iii) Switch as potential networking devices.
- 2Step 2
Confirm each device participates in Ethernet frame forwarding/repeating, which is core networking functionality.
- 3Step 3
Since hub/bridge/switch are all networking devices, no elimination applies to (i)-(iii).
- 4Step 4
If none of the first three is incorrect, select (iv) None of these.
Pro Tip
In MCQs like this, “None of these” is often correct when every listed option is actually a valid example of the category (here: networking devices). Focus on definitions first.
Common Mistake
Students sometimes label a hub as “not smart” and assume that means “not a networking device.” Even a hub is still a networking component because it transmits/forwards network signals/frames.
Conceptual Evolution (Not Required for the MCQ, but Helps Understanding)
Basic frame repetition
HubBroadcasts frames to all ports."
Segment interconnection
BridgeForwards frames between LAN segments using address learning."
Efficient per-port forwarding
SwitchUses MAC address table for targeted forwarding."
Knowledge Check
Which of the following devices is not a networking device?