EX188 Networking And Compose Practice Test 4 — 15 Questions

Question 1

Two containers running on the same custom user-defined bridge network need to communicate with each other. What built-in mechanism allows them to resolve each other by container name?

Accepted Answer

Automatic DNS resolution provided by the CNI/Netavark network backend. User-defined bridge networks in Podman (backed by CNI or Netavark) provide automatic internal container name resolution through embedded DNS services.

Answer

Static ARP table broadcasting managed by the kernel

Answer

Multicast DNS (mDNS) running inside every container image by default

Answer

Automatic editing of the host's /etc/hosts file by the Podman daemon

Question 2

An administrator needs to inspect the configuration details, including subnet and gateway, of an existing custom network named 'my-net'. Which command should be executed?

Accepted Answer

podman network inspect my-net. The 'podman network inspect' command displays detailed configuration JSON for a specified network.

Answer

podman network show my-net

Answer

podman network details my-net

Answer

podman inspect network my-net

Question 3

You are deploying a container and want to bind its published port exclusively to the loopback interface (127.0.0.1) on the host to prevent external network access. Which syntax is correct?

Accepted Answer

-p 127.0.0.1:8080:80. Podman allows binding ports to a specific host IP using the format ip:host_port:container_port. Therefore, 127.0.0.1:8080:80 accomplishes this.

Answer

-p 8080:80@127.0.0.1

Answer

-p 80:80 --host-ip 127.0.0.1

Answer

--bind-ip 127.0.0.1 -p 8080:80

Question 4

An administrator needs to connect an already running container named 'web1' to an existing user-defined network named 'backend-net' without restarting the container. Which command accomplishes this?

Accepted Answer

podman network connect backend-net web1. The 'podman network connect' command attaches a running container to an additional network interface.

Answer

podman network attach backend-net web1

Answer

podman container modify --network backend-net web1

Answer

podman network join --container web1 backend-net

Question 5

You have a Kubernetes YAML manifest file named 'app.yaml' that defines a Pod with network settings. You want to deploy this directly as a Podman container/pod on your local system. Which command should you use?

Accepted Answer

podman play kube app.yaml. The 'podman play kube' command reads a Kubernetes YAML file and deploys the defined pods and containers locally.

Answer

podman-compose up --file app.yaml

Answer

podman run --kube app.yaml

Answer

podman apply -f app.yaml

Question 6

When utilizing Podman Compose, how are service dependencies and container startup orders typically managed within the YAML structure?

Accepted Answer

Using the 'depends_on' configuration key under the service definition. The 'depends_on' key in a Compose file is used to express startup dependencies between services.

Answer

By ordering the service keys alphabetically in the YAML file

Answer

Using the 'links' parameter exclusively

Answer

Through the 'startup_order' directive

Question 7

Which configuration block in a Podman Compose YAML file is used to define custom isolated networks for the multi-container application?

Accepted Answer

networks:. At the root level of a Compose file, the 'networks:' top-level element defines custom networks that services can attach to.

Answer

interfaces:

Answer

bridges:

Answer

connections:

Question 8

An operator runs a Podman container and needs to inspect its assigned IP address directly from the container's runtime inspection output. Which command filters the JSON output to show only the IP address?

Accepted Answer

podman inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' container_name. The --format flag with Go templates allows extracting specific fields like network IP addresses from 'podman inspect'.

Answer

podman show-ip container_name

Answer

podman network ip container_name

Answer

podman inspect --ip container_name

Question 9

You need to completely remove a custom user-defined bridge network named 'test-net' that has no active containers attached to it. Which command performs this action?

Accepted Answer

podman network rm test-net. The 'podman network rm' command deletes an existing unused user-defined network.

Answer

podman network prune --force

Answer

podman rm network test-net

Answer

podman network delete test-net

Question 10

When configuring container networking in Podman, which TWO built-in network modes are available by default without creating custom networks? (Choose two)

Accepted Answer

bridge. Podman provides default network behaviors including 'bridge' (the default NAT network) and 'host' (sharing the host network stack).

Answer

macvlan

Answer

routed

Answer

overlay

Question 11

Which TWO statements are true regarding user-defined bridge networks in Podman? (Choose two)

Accepted Answer

They allow administrators to specify custom subnets and gateways during creation.. User-defined bridge networks provide automatic container name resolution via internal DNS and allow defining custom subnets.

Answer

They require the host firewall to be completely disabled to function.

Answer

Containers attached to different user-defined networks can communicate without explicit routing.

Answer

They prevent containers from communicating with the outside internet entirely.

Question 12

When working with Podman Compose files, which TWO options are valid keys that can be specified under a service definition for port and networking configuration? (Choose two)

Accepted Answer

networks. In Compose files, 'ports' defines port mappings to the host, and 'networks' assigns the service to specific custom networks.

Answer

firewall

Answer

nat_mapping

Answer

ip_address

Question 13

Which THREE commands are valid Podman subcommands for managing container networks? (Choose three)

Accepted Answer

podman network ls. Podman provides network management via 'podman network ls', 'podman network inspect', and 'podman network create'.

Answer

podman network restart

Answer

podman network upgrade

Question 14

When publishing container ports using the Podman CLI, which THREE methods or syntaxes are valid for the -p / --publish flag? (Choose three)

Accepted Answer

-p 8080:80. Valid port publishing syntaxes include mapping host port to container port, specifying protocol (UDP/TCP), and binding to a specific host IP.

Answer

-p container=80,host=8080

Answer

-p 80:8080:tcp:bind

Question 15

Which THREE actions occur when a container is executed with the --network none flag? (Choose three)

Accepted Answer

No default gateway is configured in the container's routing table.. Using --network none results in no external network interfaces except loopback, no default gateway, and no external IP address assigned.

Answer

The container automatically shares the host's physical network card.

Answer

The container is assigned a private IP address on the default bridge.