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200-150 · Question #28

A network engineer proposes that old hubs be replaced by new Layer 2 switches in the company network. Which three are reasons for this proposal? (Choose three.)

The correct answer is A. Each port on a switch becomes its own collision domain. C. Hubs create one large collision domain and one large broadcast domain, which greatly F. Data transmission is faster on switches because switches work at line card speed. Switches improve on hubs by isolating collision domains per port, eliminating the single large collision domain that hubs impose, and forwarding frames at hardware line card speed.

Cisco Data Center Networking Technologies

Question

A network engineer proposes that old hubs be replaced by new Layer 2 switches in the company network. Which three are reasons for this proposal? (Choose three.)

Options

  • AEach port on a switch becomes its own collision domain.
  • BLayer 2 switches provide IP routing at line card speed.
  • CHubs create one large collision domain and one large broadcast domain, which greatly
  • DSwitches create one large collision domain and one large broadcast domain, which greatly
  • EBy connecting each device directly to a port on the hub, each port on a switch becomes its own
  • FData transmission is faster on switches because switches work at line card speed.

How the community answered

(36 responses)
  • A
    89% (32)
  • B
    3% (1)
  • D
    8% (3)

Why each option

Switches improve on hubs by isolating collision domains per port, eliminating the single large collision domain that hubs impose, and forwarding frames at hardware line card speed.

AEach port on a switch becomes its own collision domain.Correct

Each switch port is its own collision domain, meaning only the two endpoints on a point-to-point link contend for bandwidth, eliminating the CSMA/CD collisions that occur when multiple devices share a hub's single medium.

BLayer 2 switches provide IP routing at line card speed.

Layer 2 switches operate at the data link layer and do not perform IP routing - IP forwarding at line rate is a feature of Layer 3 switches or routers, not Layer 2 switches.

CHubs create one large collision domain and one large broadcast domain, which greatlyCorrect

Hubs operate at Layer 1 and force all connected devices to share one collision domain, causing collisions and throughput degradation as more devices are added - this is a primary technical reason to replace them with switches.

DSwitches create one large collision domain and one large broadcast domain, which greatly

Switches do not create one large collision domain - they segment the network into individual per-port collision domains, which is the opposite of hub behavior and the key reason switches are preferred.

EBy connecting each device directly to a port on the hub, each port on a switch becomes its own

This choice incorrectly attributes collision domain isolation to 'a port on the hub,' when collision domain isolation is a property of switch ports, not hub ports.

FData transmission is faster on switches because switches work at line card speed.Correct

Switches use dedicated ASICs to process frames at line card speed, providing deterministic high-throughput forwarding compared to hubs, which simply regenerate electrical signals with no buffering or intelligent forwarding.

Concept tested: Hub vs switch collision domains and throughput

Source: https://www.cisco.com/c/en/us/solutions/small-business/resource-center/networking/what-is-a-network-switch.html

Topics

#collision domain#hub vs switch#Layer 2 switching#network segmentation

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