JN0-214 Exam Dumps : Cloud Associate (JNCIA-Cloud)

Docker provides various commands to manage and interact with Docker objects such as containers, images, networks, and volumes. To obtainlow-level informationabout these objects, thedocker inspectcommand is used. Let’s analyze each option:

A. docker info <OBJECT_NAME>

Incorrect:Thedocker infocommand provides high-level information about the Docker daemon itself, such as the number of containers, images, and system-wide configurations. It does not provide detailed information about specific Docker objects.

B. docker inspect <OBJECT_NAME>

Correct:Thedocker inspectcommand retrieves low-level metadata and configuration details about Docker objects (e.g., containers, images, networks, volumes). This includes information such as IP addresses, mount points, environment variables, and network settings. It outputs the data in JSON format for easy parsing and analysis.

C. docker container <OBJECT_NAME>

Incorrect:Thedocker containercommand is a parent command for managing containers (e.g.,docker container ls,docker container start). It does not directly provide low-level information about a specific container.

D. docker system <OBJECT_NAME>

Incorrect:Thedocker systemcommand is used for system-wide operations, such as pruning unused resources (docker system prune) or viewing disk usage (docker system df). It does not provide low-level details about specific Docker objects.

Why docker inspect?

Detailed Metadata: docker inspectis specifically designed to retrieve comprehensive, low-level information about Docker objects.

Versatility:It works with multiple object types, including containers, images, networks, and volumes.

JNCIA Cloud References:

The JNCIA-Cloud certification covers Docker as part of its containerization curriculum. Understanding how to use Docker commands likedocker inspectis essential for managing and troubleshooting containerized applications in cloud environments.

For example, Juniper Contrail integrates with container orchestration platforms like Kubernetes, which rely on Docker for container management. Proficiency with Docker commands ensures effective operation and debugging of containerized workloads.

In cloud networking, overlay networks are used to create virtualized networks that abstract the underlying physical infrastructure. To supportmultipath capabilities, certain protocols provide efficient tunneling mechanisms. Let’s analyze each option:

A. MPLSoGRE

Incorrect:MPLS over GRE (MPLSoGRE) is a tunneling protocol that encapsulates MPLS packets within GRE tunnels. While it supports MPLS traffic, it does not inherently provide multipath capabilities.

B. VXLAN

Correct:VXLAN (Virtual Extensible LAN) is an overlay protocol that encapsulates Layer 2 Ethernet frames within UDP packets. It supports multipath capabilities by leveraging the Equal-Cost Multi-Path (ECMP) routing in the underlay network. VXLAN is widely used in cloud environments for extending Layer 2 networks across data centers.

C. VPN

Incorrect:Virtual Private Networks (VPNs) are used to securely connect remote networks or users over public networks. They do not inherently provide multipath capabilities or overlay tunneling for virtual networks.

D. MPLSoUDP

Correct:MPLS over UDP (MPLSoUDP) is a tunneling protocol that encapsulates MPLS packets within UDP packets. Like VXLAN, it supports multipath capabilities by utilizing ECMP in the underlay network. MPLSoUDP is often used in service provider environments for scalable and flexible network architectures.

Why These Protocols?

VXLAN:Provides Layer 2 extension and supports multipath forwarding, making it ideal for large-scale cloud deployments.

MPLSoUDP:Combines the benefits of MPLS with UDP encapsulation, enabling efficient multipath routing in overlay networks.

JNCIA Cloud References:

The JNCIA-Cloud certification covers overlay networking protocols like VXLAN and MPLSoUDP as part of its curriculum on cloud architectures. Understanding these protocols is essential for designing scalable and resilient virtual networks.

For example, Juniper Contrail uses VXLAN to extend virtual networks across distributed environments, ensuring seamless communication and high availability.

OpenStack is an open-source cloud computing platform that provides various services for managing infrastructure resources. Let’s analyze each option:

A. Keystone

Correct: Keystone is the OpenStack service responsible for identity management and API client authentication . It provides authentication, authorization, and service discovery for other OpenStack services.

B. Nova

Incorrect: Nova is the OpenStack compute service that manages virtual machines and bare-metal servers. It does not handle authentication or API client validation.

C. Heat

Incorrect: Heat is the OpenStack orchestration service that automates the deployment and management of infrastructure resources using templates. It does not provide authentication services.

D. Neutron

Incorrect: Neutron is the OpenStack networking service that manages virtual networks, routers, and IP addresses. It is unrelated to API client authentication.

Why Keystone?

Authentication and Authorization: Keystone ensures that only authorized users and services can access OpenStack resources by validating credentials and issuing tokens.

Service Discovery: Keystone also provides a catalog of available OpenStack services and their endpoints, enabling seamless integration between components.

JNCIA Cloud References:

The JNCIA-Cloud certification covers OpenStack services, including Keystone, as part of its cloud infrastructure curriculum. Understanding Keystone’s role in authentication is essential for managing secure OpenStack deployments.

For example, Juniper Contrail integrates with OpenStack Keystone to authenticate and authorize network resources, ensuring secure and efficient operation.