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NET+ N10-009 V9 Network troubleshooting Branch services troubleshooting project · 2 of 2 Runs in your browser · no setup Original practice · Review pending

Resolve a changed branch-services incident

Diagnose a similar symptom with a different fault and reject the previous incident's fix.

Estimated20 min
DifficultyIntermediate
Points15
Changed-fault follow-up

Optional changed-fault follow-up with recommended spacing only. ITForMe does not verify elapsed time, so completion is not delayed-retention evidence. The cause and required configuration change differ from the earlier incident.

Scenario brief

Fictional Alder Street Workshop opens a Training VLAN. New training clients cannot obtain leases or resolve lab.alderstreet.test. CORE-DIST owns the Training gateway and DHCP relay; ALDER-SW1 is the Layer 2 access switch for the affected client. Change CHG-319 permits one evidence-based correction, client validation, and a documented rollback. Treat this as a new incident; do not assume the earlier cause repeated.

Content record

Original practice · Review pending

Mapped to CompTIA N10-009 objectives · Internal validation 2026-10-05 · Original ITForMe practice mapped to published objectives; not an official exam question. A named independent subject-matter expert has not yet verified the question and answer key.

Community review →
2.2Given a scenario, configure switching technologies and features. 5.1Explain the troubleshooting methodology. 5.3Given a scenario, troubleshoot common issues with network services. 5.5Given a scenario, use the appropriate tool or protocol to solve networking issues. 3.4Given a scenario, implement IPv4 and IPv6 network services. 3.1Explain the purpose of organizational processes and procedures.
Show review record and official sources

Method: Mapped to N10-009 objectives 2.2, 3.1, 3.4, 5.1, 5.3, and 5.5. The changed fault, additive trunk repair, misleading prior-scenario action, verification boundaries, and rollback evidence were checked against Cisco VLAN trunk documentation and the initial project's transfer contract.

Current-profile check: 2026-08-12 · Next review due 2027-02-08

01

Inspect the evidence

Use only the information provided to complete the tasks.

Ticket and approved service plan

table
ComponentApproved valueConstraint
Training VLAN70 · 192.0.2.128/27Gateway 192.0.2.129
DHCP and internal DNS198.51.100.42CORE-DIST Vlan70 relays to it
Training accessALDER-SW1 Gi1/0/14 access VLAN 70Uplink Gi1/0/24 must carry 10,30,70,99 to CORE-DIST
RollbackRemove only newly added VLAN 70Retain every pre-change allowed VLAN

If columns are offscreen, scroll sideways or focus the table and use arrow keys.

Client and comparison checks

code
TRAIN-LT03 after ipconfig /release and /renew
  Autoconfiguration IPv4 Address: 169.254.70.31/16
  DHCP Server: none
  MAC 00:50:56:aa:70:03 is learned on Gi1/0/14 in VLAN 70

STAFF-LT02 on VLAN 10
  ping 198.51.100.42 ............. PASS
  nslookup lab.alderstreet.test 198.51.100.42
    Name: lab.alderstreet.test
    Address: 198.51.100.71

CORE-DIST routed-service observations

code
show running-config interface vlan 70
  interface Vlan70
   ip address 192.0.2.129 255.255.255.224
   ip helper-address 198.51.100.42
   no shutdown
show ip interface brief | include Vlan70
  Vlan70  192.0.2.129  up  up

ALDER-SW1 Layer 2 observations

code
show interfaces gi1/0/14 switchport
  Operational Mode: static access
  Access Mode VLAN: 70
show interfaces trunk
  Gi1/0/24 allowed and active: 10,30,99
02

Complete the response

Partial credit is available for matching, ordering, and multi-select tasks.

Changes will save automatically.
01
single choice

Which fault best fits all of the current evidence?

3 pts
Need a hint?

Restate the exact outcome or failure the prompt asks about before comparing choices.

Show another hint

Eliminate choices that solve a nearby problem, change more than requested, or do not fit the evidence.

02
switch cli

Use the isolated ALDER-SW1 console to inspect the current state, correct only the supported path defect without removing working VLANs, verify the result, and save it.

5 pts
AtlasOS 4.2 training simulatorBounded IOS-style practice syntax
Browser simulator
Isolated configuration model—not a vendor emulator or packet simulator. Commands change only this published scenario state.
Need a hint?

Inspect the current state with show commands before changing configuration; enter ? to see available commands.

Show another hint

Change the smallest required scope, verify the resulting state, and save only when the scenario calls for it.

03
matching

Match each post-change check to the outcome it actually verifies.

4 pts
Need a hint?

Start with the row and choice that have the most distinctive purpose, then use that pair to narrow the rest.

Show another hint

For each remaining pair, explain the relationship in one sentence before selecting it.

04
single choice

Which ticket note documents this changed incident without importing the previous incident's assumption?

3 pts
Need a hint?

Restate the exact outcome or failure the prompt asks about before comparing choices.

Show another hint

Eliminate choices that solve a nearby problem, change more than requested, or do not fit the evidence.

Ready to check your work?Unanswered tasks and matches earn no points. A partial submission is scored and saved in your history.
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