D325 Networks-Questions All Solved (A Pass) 2026
Update
Swap fiber strands to fix no connectivity
Swapping the TX/RX fiber strands at one end corrects transmitter/receiver polarity and restores
physical connectivity.
TX/RX mismatch
A common fiber issue where transmit and receive lines are reversed, causing no link lights or
connectivity.
Crosstalk
Interference caused by signals in adjacent copper cables, leading to errors and packet loss.
Twinaxial cable
Short-range, high-speed cable used for SATA 3.0 and SFP+ uplinks in the same rack.
PDU
Device used to distribute electrical power efficiently to rack equipment in a data center.
Clean agent fire suppression
Gas-based fire suppression (like FM-200) that extinguishes fires without damaging electronic
equipment.
MDF
Primary termination point for external ISP/carrier links entering a building.
, North-South traffic
Traffic entering or leaving the data center from external networks.
East-West traffic
Traffic moving within the data center between internal servers and systems.
802.1Q
VLAN tagging standard used on trunk ports to carry multiple VLANs on a single link.
Voice VLAN
Special VLAN used to prioritize VoIP traffic on switchports that connect phones and PCs.
Broadcast domains on an unmanaged switch
An unmanaged Layer 2 switch has one broadcast domain, regardless of port count.
LACP (Link aggregation control protocol)
combines multiple physical links into one logical link for bandwidth and redundancy.
Primary purpose of link aggregation
To create a higher-bandwidth, redundant logical link from multiple physical links.
802.11h
Wireless amendment adding Transmit Power Control (TPC) and DFS for regulated frequency
bands.
Transmit Power Control (TPC)
Adjusts wireless transmit power to reduce interference and comply with regulatory limits.
Update
Swap fiber strands to fix no connectivity
Swapping the TX/RX fiber strands at one end corrects transmitter/receiver polarity and restores
physical connectivity.
TX/RX mismatch
A common fiber issue where transmit and receive lines are reversed, causing no link lights or
connectivity.
Crosstalk
Interference caused by signals in adjacent copper cables, leading to errors and packet loss.
Twinaxial cable
Short-range, high-speed cable used for SATA 3.0 and SFP+ uplinks in the same rack.
PDU
Device used to distribute electrical power efficiently to rack equipment in a data center.
Clean agent fire suppression
Gas-based fire suppression (like FM-200) that extinguishes fires without damaging electronic
equipment.
MDF
Primary termination point for external ISP/carrier links entering a building.
, North-South traffic
Traffic entering or leaving the data center from external networks.
East-West traffic
Traffic moving within the data center between internal servers and systems.
802.1Q
VLAN tagging standard used on trunk ports to carry multiple VLANs on a single link.
Voice VLAN
Special VLAN used to prioritize VoIP traffic on switchports that connect phones and PCs.
Broadcast domains on an unmanaged switch
An unmanaged Layer 2 switch has one broadcast domain, regardless of port count.
LACP (Link aggregation control protocol)
combines multiple physical links into one logical link for bandwidth and redundancy.
Primary purpose of link aggregation
To create a higher-bandwidth, redundant logical link from multiple physical links.
802.11h
Wireless amendment adding Transmit Power Control (TPC) and DFS for regulated frequency
bands.
Transmit Power Control (TPC)
Adjusts wireless transmit power to reduce interference and comply with regulatory limits.
