220-801 · Question #444
Which of the following will send all received packets out all of its ports except the port it was received on?
The correct answer is D. Hub. A hub is an OSI Layer 1 device that floods all incoming traffic out every port except the one it was received on, creating a shared collision domain.
Question
Which of the following will send all received packets out all of its ports except the port it was received on?
Options
- ASwitch
- BRouter
- CWAP
- DHub
How the community answered
(32 responses)- A6% (2)
- C3% (1)
- D91% (29)
Why each option
A hub is an OSI Layer 1 device that floods all incoming traffic out every port except the one it was received on, creating a shared collision domain.
A switch operates at OSI Layer 2 and uses a MAC address table to forward frames only to the specific port associated with the destination MAC address, preventing unnecessary flooding.
A router operates at OSI Layer 3, uses routing tables to forward packets between different networks based on IP addresses, and does not broadcast frames to all ports.
A WAP (Wireless Access Point) bridges wireless 802.11 clients to a wired Ethernet segment; it does not flood frames out all physical ports.
A hub has no MAC address intelligence and operates purely at the physical layer; every electrical signal it receives is immediately regenerated and broadcast out all other ports, making all connected devices share the same collision domain. This flooding behavior is the defining characteristic that distinguishes a hub from a switch.
Concept tested: Hub Layer 1 flooding behavior vs switch forwarding
Source: https://www.cisco.com/c/en/us/support/docs/lan-switching/ethernet/12006-chapter9.html
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