RCDD (RCDD): Case Studies and Concepts 4

Question 1

A school district is deploying IP security cameras throughout 15 buildings on a campus. The cameras require PoE and 4K video streaming. What cabling category does the RCDD recommend as the minimum for reliable performance?

Accepted Answer

CAT 6A

Answer

CAT 6A supports 10GBASE-T and full 4-pair PoE (IEEE 802.3bt) power delivery without significant heat buildup, making it the recommended minimum for high-bandwidth PoE cameras.

Question 2

The RCDD is performing a post-installation test of newly installed CAT 6A cabling. One link fails the alien crosstalk (ANEXT) test. What is the most likely cause?

Accepted Answer

Cables bundled tightly together without maintaining separation

Answer

Tight bundling of CAT 6A cables significantly increases alien crosstalk (ANEXT/AFEXT) by allowing coupling between adjacent cable pairs.

Question 3

An RCDD is designing a wireless LAN system and must place access points to achieve -67 dBm signal coverage. The facility has concrete walls with 15 dB attenuation. The AP transmits at 20 dBm with a 3 dBi antenna. How many AP placements are needed across a 50,000 sq ft floor?

Accepted Answer

Determine by calculating maximum radius from signal budget before coverage overlap

Answer

Proper AP placement requires a link budget calculation (Tx power + antenna gain − wall losses ≥ target RSSI) to determine maximum usable radius, then plan overlapping cells.

Question 4

During a design review for a new corporate campus, the RCDD identifies that the proposed main cross-connect (MC) is located in a space that floods during heavy rain events. What is the most appropriate corrective action?

Accepted Answer

Relocate the MC to a space that meets ANSI/TIA-569-D environmental requirements

Answer

ANSI/TIA-569-D requires that telecommunications rooms be located away from areas prone to flooding; the correct action is to relocate the MC.

Question 5

A case study involves a retail chain deploying a converged network for POS systems, inventory scanners, and VoIP phones across 50 stores. Which network architecture concept should the RCDD apply to prioritize POS and VoIP traffic?

Accepted Answer

VLAN segmentation with QoS policies applied at the distribution layer

Answer

VLAN segmentation with QoS (Quality of Service) policies allows the network to prioritize latency-sensitive POS and VoIP traffic over a shared physical infrastructure.

RCDD - Registered Communications Distribution Designer Practice Test

RCDD - Registered Communications Distribution Designer Practice Test

RCDD (RCDD): Case Studies and Concepts 4