EX188 Networking And Compose Practice Test 3 — 15 Questions

Question 1

You have created a Podman pod and want to launch two containers inside this pod so they share the same network namespace. How do you specify this during container creation?

Accepted Answer

podman run --pod mypod -d myimage. Using '--pod <pod_name>' places the new container inside an existing pod, sharing its network, IPC, and UTS namespaces.

Answer

podman run --share-namespace mypod -d myimage

Answer

podman pod connect mypod myimage

Answer

podman run --network pod:mypod -d myimage

Question 2

How do you check the logs of all services managed by a Podman Compose file?

Accepted Answer

podman-compose logs. 'podman-compose logs' displays log output from all services defined in the compose file.

Answer

podman-compose monitor

Answer

podman-compose output

Answer

podman logs --compose

Question 3

Which environment file option can be used in a Podman Compose file to automatically load environment variables for service configuration?

Accepted Answer

env_file. The 'env_file' directive allows passing a .env file into containers or using them for interpolation.

Answer

environment_source

Answer

variables_file

Answer

load_env

Question 4

You need to configure container DNS servers explicitly when running a container, overriding the host's /etc/resolv.conf settings. Which Podman flag do you use?

Accepted Answer

--dns 8.8.8.8. The --dns flag specifies custom DNS servers for the container.

Answer

--resolv-conf custom

Answer

--nameserver 8.8.8.8

Answer

--dns-search 8.8.8.8

Question 5

When deploying containers using Podman Compose, what is the default network driver assigned to user-defined networks created by compose if no driver is specified?

Accepted Answer

bridge. The default bridge driver is used for user-defined compose networks unless specified otherwise.

Answer

host

Answer

macvlan

Answer

overlay

Question 6

Which TWO actions can be performed using the 'podman network' subcommand? (Choose two.)

Accepted Answer

ls. 'podman network' manages networks including listing (ls) and removing (rm).

Answer

start

Answer

build

Answer

commit

Question 7

Which THREE configuration keys are valid within a service definition block in a Podman Compose file for managing container networking and ports? (Choose three.)

Accepted Answer

ports. 'ports', 'expose', and 'networks' are valid compose keys.

Answer

interfaces

Answer

firewall

Question 8

Which TWO files or backend network management utilities are heavily relied upon by Podman for container networking stack configuration on modern Linux distributions? (Choose two.)

Accepted Answer

aardvark-dns. Netavark and aardvark-dns are the modern backend tools used by Podman.

Answer

libnetwork

Answer

docker-proxy

Answer

iptables-nft

Question 9

When generating Kubernetes YAML using 'podman generate kubernetes', which TWO object types can be targeted or generated by the command? (Choose two.)

Accepted Answer

Deployment. Podman can generate Kubernetes Pod and Deployment manifests.

Answer

DaemonSet

Answer

StatefulSet

Answer

Ingress

Question 10

Which THREE subcommands are valid under 'podman-compose' (or 'podman compose') for managing container lifecycles and application stacks? (Choose three.)

Accepted Answer

logs. 'up', 'down', and 'logs' are valid compose subcommands.

Answer

compile

Answer

deploy

Question 11

Which THREE methods or directives can be used to pass environment variables into containers via Podman Compose? (Choose three.)

Accepted Answer

env_file. Environment variables can be passed using 'environment', 'env_file', and shell interpolation.

Answer

sysctl_env

Answer

container_env

Question 12

An administrator needs to run a container that shares the host's network namespace directly so it can listen on privileged ports without port forwarding. Which Podman command flag achieves this network mode?

Accepted Answer

--network host. The --net=host or --network host flag causes the container to run in the host's network namespace, giving it direct access to the host network interfaces and ports.

Answer

--network bridge

Answer

--publish-all

Answer

--net=none

Question 13

You are troubleshooting a container that should have no network access whatsoever for security isolation. Which networking option should you apply?

Accepted Answer

--network none. The 'none' network driver disables all external networking for the container, leaving only the loopback interface active.

Answer

--network isolated

Answer

--network bridge

Answer

--network host

Question 14

A containerized web service must be accessible from the host system on TCP port 8080, while the application inside the container listens on port 80. Which flag correctly configures this port mapping?

Accepted Answer

-p 8080:80. The format for the --publish or -p flag is host_port:container_port. Thus, -p 8080:80 maps host port 8080 to container port 80.

Answer

--expose 8080:80

Answer

-p 80:8080

Answer

--port-map 8080=80

Question 15

An operator wants to create a custom user-defined bridge network named 'app-net' with a specific subnet of '192.168.100.0/24' using Podman. Which command is correct?

Accepted Answer

podman network create --subnet 192.168.100.0/24 app-net. User-defined networks are created with 'podman network create'. The --subnet flag specifies the CIDR block for the network.

Answer

podman bridge create app-net --subnet 192.168.100.0/24

Answer

podman create network --ip 192.168.100.0/24 app-net

Answer

podman network new --subnet=192.168.100.0/24 app-net