Consul 1.15 Practice Test 2 — 10 Questions

Question 1

A service has a TTL check configured with a 30-second TTL. If the application crashes and stops sending heartbeats, when will the service status change to 'critical'?

Accepted Answer

After 30 seconds. Consul marks a TTL check as critical if the heartbeat is not received within the specified TTL duration.

Answer

After 60 seconds

Answer

Once the agent restarts

Answer

Immediately

Question 2

Which states can a health check report? (Select THREE)

Accepted Answer

passing. The three standard states are passing, warning, and critical.

Answer

terminated

Answer

pending

Question 3

When using the Consul KV store, what is the maximum size allowed for a single value in a key?

Accepted Answer

512 KB. Consul enforces a hard limit of 512 KB per KV entry value.

Answer

There is no limit.

Answer

128 KB

Answer

1 MB

Question 4

You need to ensure that a read operation from the KV store is strongly consistent. Which consistency mode should you specify?

Accepted Answer

consistent. The 'consistent' consistency mode forces the leader to verify its leadership with a quorum of peers, ensuring strong consistency.

Answer

default

Answer

quorum

Answer

stale

Question 5

When configuring a Service-specific health check, what is the impact of setting the 'expose' field to true?

Accepted Answer

The check status is exposed on the HTTP interface. Setting 'expose' to true allows the service to expose its health checks via the local agent's HTTP interface, enabling external access to the health check status.

Answer

The service is automatically registered with a Load Balancer

Answer

The check is bypassed

Answer

The agent automatically upgrades the check to HTTP

Question 6

Which THREE of the following are required to successfully acquire a lock on a KV key?

Accepted Answer

A valid session ID. To acquire a lock, you need a session, the key itself, and the acquire parameter in the API call.

Answer

A 'write' ACL policy

Answer

A 'wait' parameter

Question 7

Which THREE of the following represent potential bottlenecks for Consul KV performance?

Accepted Answer

Very large number of keys. High update frequency, massive key counts, and large value sizes all impact KV performance.

Answer

High read frequency

Answer

Using HTTP instead of RPC

Question 8

Which TWO of the following accurately describe Consul's WAN gossip protocol behavior?

Accepted Answer

It involves only the server nodes of each datacenter.. WAN gossip is designed for high latency links and involves only server nodes, not all cluster nodes.

Answer

It relies on a central hub-and-spoke architecture.

Answer

It includes all client nodes in the gossip pool.

Answer

It is mandatory for service discovery.

Question 9

Which actions can you perform on a TTL check? (Select TWO)

Accepted Answer

pass. You can tell Consul that the check passed or is in a warning state.

Answer

restart

Answer

suspend

Answer

fail

Question 10

What is the default value for the Consul KV flags field if not provided during a write?

Accepted Answer

0. The default value for flags is 0.

Answer

1

Answer

null

Answer

-1