Troubleshooting practice questions

Which TWO of the following are valid ways to troubleshoot inter-datacenter communication issues?

Trap 1: Change the datacenter name in the config.

This will break the existing cluster configuration.

Trap 2: Restart all clients in the datacenter.

This is disruptive and rarely resolves DC issues.

Trap 3: Use 'consul kv export' to sync data.

This is not for troubleshooting communication.

A
Change the datacenter name in the config.
Why wrong: This will break the existing cluster configuration.
B
Inspect server logs for RPC errors between datacenters.
RPC logs reveal cross-DC connectivity issues.
C
Restart all clients in the datacenter.
Why wrong: This is disruptive and rarely resolves DC issues.
D
Use 'consul members -wan' to verify remote server visibility.
Correct troubleshooting command.
E
Use 'consul kv export' to sync data.
Why wrong: This is not for troubleshooting communication.

Question 2mediummulti select

When troubleshooting a failing health check, which tools are recommended? (Select TWO)

Trap 1: DNS query

DNS does not show check details.

Trap 2: Consul key-value store

Irrelevant.

Trap 3: System metrics

Not for check debugging.

A
Consul UI
Provides a visual check status.
B
Agent logs
Useful for errors.
C
DNS query
Why wrong: DNS does not show check details.
D
Consul key-value store
Why wrong: Irrelevant.
E
System metrics
Why wrong: Not for check debugging.

Question 3mediummultiple choice

You are troubleshooting why a service registered via HTTP API is not showing up in the catalog. Which tool provides the most immediate insight into the registration status?

Trap 1: consul kv get

KV store is separate from the service catalog.

Trap 2: consul reload

This command triggers a configuration reload.

Trap 3: consul members

This shows cluster membership, not service state.

A
consul kv get
Why wrong: KV store is separate from the service catalog.
B
consul catalog services
This command lists all services currently registered in the catalog.
C
consul reload
Why wrong: This command triggers a configuration reload.
D
consul members
Why wrong: This shows cluster membership, not service state.

Question 4mediummultiple choice

You are troubleshooting a health check that seems to be hanging. Which flag, if available, would provide more information about the check's execution within the agent logs?

Trap 1: -verbose

This flag is not used for logging.

Trap 2: -monitor-checks

This flag does not exist.

Trap 3: -trace

This is not a valid flag.

A
-verbose
Why wrong: This flag is not used for logging.
B
-log-level=debug
Debug level logs show detailed check activity.
C
-monitor-checks
Why wrong: This flag does not exist.
D
-trace
Why wrong: This is not a valid flag.

Question 5hardmultiple choice

You are troubleshooting a partition between two datacenters. The WAN gossip shows high latency. Which Consul CLI tool provides the best insight into the WAN gossip state?

Trap 1: consul operator raft list-peers

This shows Raft peers within a single DC, not WAN members.

Trap 2: consul monitor

Monitor shows agent logs, not global gossip state.

Trap 3: consul kv get

KV access does not show network gossip status.

A
consul operator raft list-peers
Why wrong: This shows Raft peers within a single DC, not WAN members.
B
consul members -wan
This command specifically shows members across the WAN gossip pool.
C
consul monitor
Why wrong: Monitor shows agent logs, not global gossip state.
D
consul kv get
Why wrong: KV access does not show network gossip status.

Question 6hardmultiple choice

When troubleshooting a service that fails to start its Envoy proxy, which service definition field should you check for incorrect configuration?

Trap 1: checks

Checks are for health monitoring.

Trap 2: meta

Meta fields don't affect proxy startup.

Trap 3: tags

Tags are for service discovery.

A
proxy
Errors here directly impact proxy startup.
B
checks
Why wrong: Checks are for health monitoring.
C
meta
Why wrong: Meta fields don't affect proxy startup.
D
tags
Why wrong: Tags are for service discovery.

Question 7hardmultiple choice

You are troubleshooting a connection error where the sidecar proxy cannot reach the upstream service. Which log file provides the most detail regarding Envoy's connectivity issues?

Trap 1: System syslog

Syslog is too generic.

Trap 2: Consul server audit log

Audit logs track administrative actions.

Trap 3: Consul agent log

The agent log focuses on the service registry, not the data plane proxy traffic.

A
System syslog
Why wrong: Syslog is too generic.
B
Consul server audit log
Why wrong: Audit logs track administrative actions.
C
Consul agent log
Why wrong: The agent log focuses on the service registry, not the data plane proxy traffic.
D
Envoy access log
Envoy access logs specifically detail proxy-level connectivity.