Question # 1
| Which TWO statements are TRUE about Private IP addresses in Oracle Cloud Infrastructure (OCI)? | | A. By default, the primary VNIC of an instance in a subnet has one primary private IP address and one secondary private IP address. | | B. Each VNIC can only have one private IP address. | | C. By default, the primary VNIC of an instance in a subnet has one primary private IP address. | | D. A private IP can have an optional public IP assigned to it if it resides in a public subnet. |
C. By default, the primary VNIC of an instance in a subnet has one primary private IP address.
D. A private IP can have an optional public IP assigned to it if it resides in a public subnet.
Explanation:
In Oracle Cloud Infrastructure (OCI), understanding how private IP addresses work is crucial for configuring network interfaces and managing instances within your Virtual Cloud Network (VCN).
Primary VNIC and Private IP Address:
When an instance is launched in OCI, it is attached to a Virtual Network Interface Card (VNIC). The primary VNIC, which is automatically created during the instance launch, is associated with a primary private IP address by default. This private IP address is essential for the instance to communicate within the VCN. The primary private IP address is automatically assigned and cannot be removed from the primary VNIC while the instance is running.This supports the statementC.
Additional Private IPs:
Contrary to statement B, each VNIC can indeed have multiple private IP addresses, but by default, the primary VNIC comes with only one primary private IP. You can manually add secondary private IPs if needed. However, the additional IPs are not assigned by default; hence,Ais incorrect.
Public IP Association:
For instances requiring internet access, a public IP address can be optionally assigned to the private IP address if the instance is in a public subnet. This is critical for scenarios where an instance needs to communicate with the internet or external networks.This aligns with statementD.
Relevant OCI Documentation:
Oracle Cloud Infrastructure Networking Overview
VNICs and Private IPs
These references provide additional context and detail on how private IP addresses work within OCI and clarify the correct statements.
=================
Question # 2
| How many capacity reservations would you create to meet the requirement for high availability and distribution across Availability Domains? | | A. One | | B. Two | | C. Three | | D. Four |
C. Three
Explanation:
In Oracle Cloud Infrastructure (OCI), to ensure high availability and distribution across Availability Domains (ADs), the recommended approach is as follows:
Capacity Reservations for High Availability: To achieve high availability, especially across all three Availability Domains in a region, you should createthree capacity reservations. Each reservation corresponds to one AD, ensuring that your instances or resources are evenly distributed and resilient to AD-level failures.
Why Three: This setup provides redundancy and load distribution across the ADs, meeting the high availability requirements.
Relevant OCI Documentation:
Capacity Reservations
This document outlines how to create and manage capacity reservations to meet high availability and fault tolerance requirements.
=================
Question # 3
| Which statement is true about pre-authenticated requests? | | A. You cannot edit a pre-authenticated request. | | B. Deleting a pre-authenticated request does not revoke access. | | C. You need to provide your OCI credentials to the partner company. | | D. Pre-authenticated requests can be used to delete buckets. |
A. You cannot edit a pre-authenticated request.
Explanation:
In Oracle Cloud Infrastructure (OCI),pre-authenticated requests (PARs)allow users to grant access to specific objects in Object Storage without requiring the recipient to have an OCI account or credentials. This feature is useful for sharing objects securely without exposing broader access.
Cannot Edit a PAR: Once a pre-authenticated request is created, you cannot edit it. If you need to change the settings, such as the expiration date or the object being shared, you must delete the existing PAR and create a new one.
Other Statements:
Deleting a PARdoes indeed revoke access immediately, contradicting option B.
Providing OCI credentials (C)is not required for using PARs. The purpose of PARs is to avoid sharing credentials.
Deleting Buckets (D): PARs are designed for accessing objects, not for administrative actions like deleting buckets.
Relevant OCI Documentation:
Managing Pre-Authenticated Requests
This reference outlines the features and limitations of pre-authenticated requests, including the inability to edit them once created.
=================
Question # 4
| Which statement accurately describes ephemeral principals? | | A. Ephemeral principals are temporary credentials granted to resources. | | B. Ephemeral principals are another term for dynamic groups. | | C. Ephemeral principals are user accounts with limited lifespans. | | D. Ephemeral principals represent long-lived service accounts. |
A. Ephemeral principals are temporary credentials granted to resources.
Explanation:
Ephemeral principals in Oracle Cloud Infrastructure (OCI) refer to temporary security credentials granted to resources, such as compute instances, to enable them to interact with OCI services securely. These credentials have a limited lifespan and are typically used in situations where resources need to authenticate temporarily without the need for long-lived credentials.
Use Case:Ephemeral principals are often used for instance principals, allowing compute instances to make API calls without the need to manage long-term keys or credentials.
References:
Oracle Cloud Infrastructure Documentation:Using Instance Principals
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Question # 5
| Which Oracle Cloud Infrastructure (OCI) Identity and Access Management (IAM) policy is invalid? | | A. Allow dynamic-group 'Default'/'FrontEnd' to manage instance-family in compartment Project-A | | B. Allow group 'Default'/'A-Admins' to manage all-resources in compartment Project-A | | C. Allow any-user to inspect users in tenancy | | D. Allow group 'Default'/'A-Developers' to create volumes in compartment Project-A |
C. Allow any-user to inspect users in tenancy
Explanation:
In Oracle Cloud Infrastructure (OCI), Identity and Access Management (IAM) policies are used to control access to resources. The policy in optionCis invalid because"any-user"is not a valid principal in OCI IAM policies. OCI policies can only grant permissions togroupsordynamic groups, but not to arbitrary users.
Here’s an explanation for each option:
A. Allow dynamic-group 'Default'/'FrontEnd' to manage instance-family in compartment Project-A: This is valid. It grants the dynamic group 'FrontEnd' the ability to manage instances within the Project-A compartment.
B. Allow group 'Default'/'A-Admins' to manage all-resources in compartment Project-A: This is valid. It provides full administrative access to all resources in the Project-A compartment for the 'A-Admins' group.
C. Allow any-user to inspect users in tenancy: This is invalid because OCI does not allow the use of "any-user" in policies. You must specify a valid group or dynamic group to define permissions.
D. Allow group 'Default'/'A-Developers' to create volumes in compartment Project-A: This is valid. It permits the 'A-Developers' group to create volumes in the Project-A compartment.
For reference:
OCI Policy Reference
=================
Question # 6
| Which components are required for establishing remote peering between two Virtual Cloud Networks (VCNs) in Oracle Cloud Infrastructure (OCI)? | | A. A single VCN with nonoverlapping CIDRS in each region, a dynamic routing gateway (DRG) attached to each VCN, and a direct connection between the DRGS. | | B. Two VCNs with overlapping CIDRS in different regions, a virtual private network (VPN) gateway attached to each VCN, and a direct connection between the VPN gateways. | | C. Two VCNs with nonoverlapping CIDRS in the same region, a dynamic routing gateway (DRG) attached to each VCN, and a direct connection between the DRGs. | | D. Two VCNs with nonoverlapping CIDRS in different regions, a dynamic routing gateway (DRG) attached to each VCN, a remote peering connection (RPC) on each DRG, and a connection established between the RPCs. |
D. Two VCNs with nonoverlapping CIDRS in different regions, a dynamic routing gateway (DRG) attached to each VCN, a remote peering connection (RPC) on each DRG, and a connection established between the RPCs.
Explanation:
Remote peering in Oracle Cloud Infrastructure allows two VCNs in different regions to communicate securely. To establish remote peering, the following components are required:
Two VCNs with Nonoverlapping CIDRs:
The CIDR blocks of the two VCNs must not overlap. This is crucial to avoid routing conflicts and ensure that traffic is correctly routed between the VCNs.
Dynamic Routing Gateway (DRG) Attached to Each VCN:
A DRG is a virtual router that provides a path for traffic between the VCN and networks outside the VCN, such as other VCNs via remote peering, on-premises networks, or other cloud services.Each VCN needs its own DRG.
Remote Peering Connection (RPC):
An RPC is a specialized connection on the DRG used specifically for remote peering. You need to create an RPC on each DRG associated with the VCNs you wish to peer.
Connection Between RPCs:
Finally, a connection must be established between the RPCs of the two DRGs. This connection facilitates the secure and private exchange of traffic between the VCNs over Oracle's backbone network.
Incorrect Options:
Option Ainvolves a single VCN, which does not fulfill the requirement of remote peering between two VCNs.
Option Binvolves overlapping CIDRs and VPN gateways, which are incorrect for remote peering.
Option Csuggests peering within the same region, which would be considered local peering rather than remote peering.
Relevant OCI Documentation:
OCI Remote VCN Peering
Dynamic Routing Gateway (DRG) Overview
These resources provide a detailed guide on configuring remote peering in OCI, ensuring secure and effective communication between VCNs across regions.
=================
Question # 7
| Which is NOT a necessary step to complete this setup for instance principals? | | A. Deploy the application and the SDK to all the instances that belong to the dynamic group. | | B. Create a dynamic group with matching rules to specify which instances can make API calls against services. | | C. Create a policy granting permissions to the dynamic group to access services in your compartment or tenancy. | | D. Generate Auth Tokens to enable instances in the dynamic group to authenticate with APIs. |
D. Generate Auth Tokens to enable instances in the dynamic group to authenticate with APIs.
Explanation:
Instance principals in OCI allow compute instances to directly make API calls against OCI services without requiring a user account. To set up instance principals, the following steps are necessary:
A. Deploy the application and SDK:The application running on the instances must use the OCI SDK or CLI to make API calls.
B. Create a dynamic group:Define a dynamic group with matching rules to identify which instances can use the API permissions.
C. Create a policy:Write an IAM policy that grants the dynamic group the necessary permissions to access services.
Option D is NOT necessarybecause instances in a dynamic group use instance principals to authenticate and do not require Auth Tokens, which are used for user authentication with APIs.
References:
Oracle Cloud Infrastructure Documentation:Using Instance Principals
=================
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