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SK0-004 · Question #69

A technician is configuring switches with SFP ports on multiple floors in a building. A switch on the first floor must be connected to a switch on the second floor for trunking VLAN traffic. Which…

The correct answer is A. Multimode fiber. SFP ports are designed for fiber optic transceivers, making multimode fiber the correct choice for inter-floor switch connections supporting VLAN trunking.

Server hardware installation and management

Question

A technician is configuring switches with SFP ports on multiple floors in a building. A switch on the first floor must be connected to a switch on the second floor for trunking VLAN traffic. Which of the following would be the MOST appropriate cable type for the technician to use?

Options

  • AMultimode fiber
  • BCoaxial cable
  • CCAT5e rollover
  • DCAT6 straight through

How the community answered

(22 responses)
  • A
    77% (17)
  • B
    14% (3)
  • C
    5% (1)
  • D
    5% (1)

Why each option

SFP ports are designed for fiber optic transceivers, making multimode fiber the correct choice for inter-floor switch connections supporting VLAN trunking.

AMultimode fiberCorrect

SFP (Small Form-factor Pluggable) ports are fiber-capable interfaces commonly used for high-speed uplinks between switches. Multimode fiber is ideal for intra-building runs between floors, supporting Gigabit or 10G speeds over distances up to 550 meters, and is the standard pairing with SFP transceivers for this use case.

BCoaxial cable

Coaxial cable is not compatible with SFP ports and is not used for modern switch-to-switch trunking.

CCAT5e rollover

A rollover (console) cable is used for out-of-band management access to a device CLI, not for carrying VLAN trunk traffic between switches.

DCAT6 straight through

CAT6 straight-through is a copper Ethernet cable used with RJ-45 ports, not SFP ports, making it incompatible unless a copper SFP transceiver is used, which is not the most appropriate choice here.

Concept tested: SFP port cabling and fiber selection

Source: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/product_bulletin_c25-530836.html

Topics

#SFP#multimode fiber#VLAN trunking#network cabling

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