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CCTDC DC Networking Question Bank (12 Questions)

Browse all 12 practice questions covering Data Center Networking Basics for the CCTDC certification exam. Each question includes the full answer and a detailed explanation to help you understand the concepts.

Question 1Cisco Data Center Administration
What does Virtual Port Channel (VPC) provide on Nexus switches?
AVLAN tagging
BAllows a device to form a port-channel across two Nexus switches, eliminating spanning tree blocking and providing active-active paths✓
CVirtual machine management
DStorage encryption
Show Answer & Explanation
Correct Answer: B
Explanation:
VPC enables a downstream device (switch, server, FI) to connect to two Nexus peers via a single logical port-channel. Both uplinks are active (no STP blocking), providing redundancy and doubling bandwidth. Key components: peer link, peer keepalive, VPC domain.
Question 2Cisco Data Center Administration
What is zoning in a Fibre Channel SAN?
APhysical rack placement
BAccess control that defines which initiators (servers) can communicate with which targets (storage) on the SAN fabric✓
CVLAN assignment for data traffic
DPower zone management
Show Answer & Explanation
Correct Answer: B
Explanation:
FC zoning controls which server HBAs (initiators) can see which storage ports (targets). Types: soft zoning (name server filtering), hard zoning (fabric-enforced). Best practice: single-initiator zoning — one server HBA per zone with its storage targets.
Question 3Data Center Software and Configuration
What is a vPC (virtual Port Channel) on Nexus switches?
AA virtual VLAN
BA technology allowing two Nexus switches to appear as a single logical switch to downstream devices, providing active-active redundancy✓
CA virtual router
DA VPN connection
Show Answer & Explanation
Correct Answer: B
Explanation:
vPC enables a device to connect to two Nexus switches using a single port-channel. Both links are active (no STP blocking). Provides: double bandwidth, fast failover, and loop-free topology without STP.
Question 4Cisco Data Center Troubleshooting
What is the first thing to check when a Virtual Port Channel (VPC) is not coming up?
ADNS resolution
BVPC peer link status, VPC domain configuration consistency, and peer keepalive connectivity between switches✓
CDHCP configuration
DNTP synchronization
Show Answer & Explanation
Correct Answer: B
Explanation:
VPC troubleshooting: 1) Check peer link status ('show vpc'), 2) Verify VPC domain IDs match, 3) Check peer keepalive link (management connectivity), 4) Run 'show vpc consistency-parameters' to identify mismatched config between peers.
Question 5Cisco Data Center Troubleshooting
What is a common cause of FCoE (Fibre Channel over Ethernet) connectivity problems?
AIP address conflicts
BMissing or incorrect DCB (Data Center Bridging) configuration including PFC (Priority Flow Control) and ETS settings✓
CDNS misconfiguration
DNTP drift
Show Answer & Explanation
Correct Answer: B
Explanation:
FCoE requires lossless Ethernet achieved through DCB: PFC (Priority Flow Control) prevents frame drops on the FCoE class, ETS (Enhanced Transmission Selection) allocates bandwidth. Missing PFC causes storage traffic drops and SCSI errors.
Question 6Cisco Data Center Troubleshooting
Why might a port-channel on a Nexus switch show individual links as suspended?
AThe switch is out of memory
BLACP parameter mismatch, speed/duplex mismatch, or incompatible port-channel mode (static vs active/passive) between the two ends✓
CThe cable is too long
DThe power supply is failing
Show Answer & Explanation
Correct Answer: B
Explanation:
Suspended port-channel members: check LACP mode (active/passive) matches, speed/duplex settings are identical, port-channel mode is compatible, and 'channel-group' config matches on both sides. 'show port-channel summary' and 'show lacp neighbor' help diagnose.
Question 7Cisco Data Center Administration
How are VLANs created on a Cisco Nexus switch?
AThey are automatically created
BUsing 'vlan <id>' in global config, then assigning a name, and assigning access or trunk ports✓
CUsing the web interface only
DVLANs are not supported on Nexus
Show Answer & Explanation
Correct Answer: B
Explanation:
On NX-OS: 'vlan 100' (creates VLAN), 'name DATA' (assigns name). Then assign to access ports ('switchport access vlan 100') or allow on trunks ('switchport trunk allowed vlan add 100'). NX-OS requires explicit feature enablement for some protocols.
Question 8Cisco Data Center Administration
What is a Virtual Port Channel (vPC) in Cisco NX-OS?
AA VLAN trunking protocol
BA technology allowing links from two switches to appear as one port-channel to a downstream device✓
CA virtual routing instance
DA storage virtualization feature
Show Answer & Explanation
Correct Answer: B
Explanation:
vPC allows two Nexus switches to present a unified port-channel to a downstream device, providing active-active redundancy and eliminating STP blocking while doubling bandwidth.
Question 9Cisco Data Center Administration
Which NX-OS command displays the vPC status and peer-link health between two Nexus switches?
Ashow spanning-tree
Bshow vpc✓
Cshow port-channel summary
Dshow vlan
Show Answer & Explanation
Correct Answer: B
Explanation:
'show vpc' displays the vPC domain status, peer-link state, peer keepalive status, and the operational state of all vPC member port-channels.
Question 10Cisco Data Center Troubleshooting
A vPC peer-link between two Nexus switches is down. What is the MOST critical impact?
AAll vPC member ports go down on the secondary switch✓
BOSPF adjacencies fail
CAll VLANs are deleted
DNTP synchronization stops
Show Answer & Explanation
Correct Answer: A
Explanation:
When the vPC peer-link fails, the secondary switch suspends all its vPC member ports to prevent duplicate traffic, since it can no longer synchronize with the primary. The keepalive link determines roles.
Question 11Cisco Data Center Troubleshooting
A server connected to a Nexus switch via vPC is experiencing intermittent connectivity. Which log should be checked first?
Ashow logging | include vpc✓
Bshow tech-support
Cshow environment
Dshow ntp status
Show Answer & Explanation
Correct Answer: A
Explanation:
Checking logs filtered for vPC events reveals peer-link flaps, role changes, or member port state changes that could cause intermittent connectivity for hosts using vPC port-channels.
Question 12Cisco Data Center Troubleshooting
A Nexus vPC keeps flapping. What is a common cause?
AIncorrect hostname
BvPC peer-link misconfiguration, inconsistent vPC parameters, or physical link issues between peers✓
CWrong DNS server
DIncorrect time zone
Show Answer & Explanation
Correct Answer: B
Explanation:
vPC flapping commonly results from peer-link failures, type-1 consistency check failures (mismatched VLAN, STP, or QoS settings), or keepalive link problems between peer switches.

Key DC Networking Concepts for CCTDC

nexusnxosvlanport channelvpcfibre channelfcoezoning

CCTDC DC Networking Exam Tips

Data Center Networking Basics questions in CCTDC are typically scenario-based. Focus on service-level decision making aligned to official exam objectives. Priority concepts: nexus, nxos, vlan, port channel, vpc, fibre channel.

What CCTDC Expects

Anchor your answer in select the most practical, secure, and scalable answer for the stated scenario.
DC Networking scenarios for CCTDC are frequently mapped to Domain 2 (30%), so read the objective carefully before picking controls or architecture.
Expect multi-service scenarios where DC Networking interacts with IAM, networking, storage, or observability patterns rather than appearing as an isolated service question.
When two options are both technically valid, prefer the choice that best aligns with the exam's operational scope (Entry) and managed-service best practices.

High-Value DC Networking Concepts

Know the core DC Networking building blocks cold: nexus, nxos, vlan, port channel.
Review the edge-case features and limits for vpc, fibre channel; these details are commonly used to differentiate answer choices.
Practice service-integration reasoning: how DC Networking pairs with DC Hardware, DC Troubleshooting in real deployment patterns.
For CCTDC, explain why the chosen DC Networking design meets reliability, security, and cost expectations better than the alternatives.

Common CCTDC Traps

Watch for answers that partially solve the requirement but miss operational constraints.
Questions in Data Center Networking and Software often include distractors that look correct for DC Networking but violate least-privilege, durability, or availability requirements.
Avoid picking options purely by feature name; validate data path, failure handling, and governance impact before answering.
If the prompt hints at automation or repeatability, eliminate manual-only operational answers first.

Fast Review Checklist

Can you compare at least two DC Networking implementation paths and justify which one best fits the scenario?
Can you map the chosen answer back to Data Center Networking and Software (30%) outcomes for CCTDC?
Can you explain security and access boundaries for DC Networking without relying on default-open assumptions?
Can you describe how DC Networking integrates with DC Hardware and DC Troubleshooting during failure, scaling, and monitoring events?

Exam Domains Covering DC Networking

Domain 2Data Center Networking and Software30%

Related Resources

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