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Cisco

300-425 · Question #56

A network has two Cisco WLCs and two Layer 3 gigabit Ethernet switches. The customer requires two gigabit connections from each Cisco WLC to each of the switches that have copper RJ-45 gigabit…

The correct answer is A. Four straight-through Ethernet cables C. Four copper SFPs must be added to the kit list. Cisco WLC uplink ports are SFP-based rather than fixed RJ-45, so copper SFP transceivers and straight-through Ethernet cables are required to connect to switches with copper gigabit ports.

Wired and Wireless Infrastructure

Question

A network has two Cisco WLCs and two Layer 3 gigabit Ethernet switches. The customer requires two gigabit connections from each Cisco WLC to each of the switches that have copper RJ-45 gigabit ports. What two additional hardware are needed to connect the Cisco WLCs to the network? (Choose two.)

Options

  • AFour straight-through Ethernet cables
  • BLayer 3 switching module in each of the Cisco WLCs
  • CFour copper SFPs must be added to the kit list
  • DTwo console cables
  • EFour rollover Ethernet cables

How the community answered

(48 responses)
  • A
    92% (44)
  • B
    2% (1)
  • D
    2% (1)
  • E
    4% (2)

Why each option

Cisco WLC uplink ports are SFP-based rather than fixed RJ-45, so copper SFP transceivers and straight-through Ethernet cables are required to connect to switches with copper gigabit ports.

AFour straight-through Ethernet cablesCorrect

Four straight-through Ethernet cables are needed because each of the two WLCs requires two connections - one to each switch - totaling four physical links, and switch-to-controller connections use straight-through wiring where each pin maps to the same pin on the opposite end.

BLayer 3 switching module in each of the Cisco WLCs

A Layer 3 switching module is not a hardware component of Cisco WLC architecture and has no role in establishing the physical Ethernet uplink connections described in this scenario.

CFour copper SFPs must be added to the kit listCorrect

Cisco WLC uplink ports are SFP slots rather than built-in RJ-45 interfaces, so copper SFP transceivers must be inserted to provide the physical copper media type that mates with the switches' fixed copper gigabit ports. With two uplinks per WLC across two controllers, four copper SFPs are required in total.

DTwo console cables

Console cables provide out-of-band serial management access to the device CLI and cannot carry standard Ethernet network data traffic between WLCs and switches.

EFour rollover Ethernet cables

Rollover cables are used exclusively for RJ-45 console port connections to network devices and are not designed to carry standard Ethernet network traffic.

Concept tested: Cisco WLC hardware requirements for copper gigabit uplink connections

Source: https://www.cisco.com/c/en/us/td/docs/wireless/controller/5500/quick/guide/ctrl5500qsg.html

Topics

#WLC hardware#copper SFP#Ethernet cable#network connectivity

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