Consul 1.15 Practice Test 8 — 10 Questions

Question 1

You have a service that needs to talk to a service in a different datacenter. What configuration is required?

Accepted Answer

A mesh gateway deployment.. Mesh gateways are required to route cross-datacenter traffic in a Consul Connect mesh.

Answer

Direct VPC peering.

Answer

An external service definition.

Answer

A global intention.

Question 2

Which file path is standard for storing the Consul server configuration, including WAN settings?

Accepted Answer

/etc/consul.d. The '/etc/consul.d' directory is the standard location for Consul configuration files on Linux systems.

Answer

/tmp/consul

Answer

/opt/consul/bin

Answer

/var/lib/consul

Question 3

Which THREE configuration items are part of a complete WAN gossip setup?

Accepted Answer

The 'server' role flag set to true.. WAN setup requires joining the WAN pool, defining the server role, and potentially setting encryption.

Answer

The 'client_addr' restricted to local only.

Answer

The 'ui' configuration set to true.

Question 4

When using multiple datacenters, what is the primary role of the 'consul-template' tool?

Accepted Answer

To generate configuration files based on Consul data.. Consul-template is often used to watch for changes in the Consul catalog and update application configurations, which can be useful when reflecting cross-DC service information.

Answer

To provision infrastructure.

Answer

To replicate KV stores.

Answer

To manage the Consul cluster nodes.

Question 5

Which TWO of the following are true about Consul datacenters?

Accepted Answer

Each datacenter must have at least one server node.. Datacenters are logical groupings and require independent server quorums.

Answer

They are strictly physical locations.

Answer

They must share the same Raft quorum.

Answer

They allow a single Consul agent to join multiple DCs.

Question 6

When configuring an ACL policy for cross-datacenter access, what policy rule is necessary to read service information from a remote datacenter?

Accepted Answer

node_prefix "" { policy = "read" }. You need 'service_prefix' or 'node_prefix' policies that explicitly allow reading in the target datacenter.

Answer

service_prefix "*" { policy = "write" }

Answer

agent_prefix "" { policy = "read" }

Answer

acl_prefix "" { policy = "read" }

Question 7

What is the primary role of the Consul Connect 'upstream' configuration?

Accepted Answer

To define the services that a local service can connect to.. Upstreams define the dependencies of a service, allowing the proxy to route to specific services.

Answer

To set intention priority.

Answer

To register external services.

Answer

To define health check ports.

Question 8

Which THREE of the following fields are typically included in a service metadata (meta) block?

Accepted Answer

environment. Meta is used for arbitrary key-value pairs to support application logic.

Answer

kernel_version

Answer

password

Question 9

What is the recommended number of Consul servers per datacenter to ensure high availability?

Accepted Answer

3. The recommended number for a consensus-based system like Consul is 3 or 5, to tolerate n/2-1 failures.

Answer

2

Answer

1

Answer

10

Question 10

You have a service that requires specific routing logic based on the environment. How can you distinguish between 'production' and 'staging' instances of the same service name using metadata?

Accepted Answer

Apply 'production' or 'staging' tags to the service definition.. Service tags are the standard way to categorize and filter services within the Consul catalog.

Answer

Use different service names for every environment.

Answer

Modify the service's port number.

Answer

Assign different Consul datacenters.