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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.

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To protect your VM instance from low-level threats, such as rootkits and bootkits, you shouldcreate a shielded instancein Oracle Cloud Infrastructure (OCI). Shielded instances are designed to provide enhanced security features, including:

Secure Boot:Ensures that the instance boots only with trusted software.

Measured Boot:Records boot metrics, allowing verification that the instance has not been tampered with.

Trusted Platform Module (TPM):Provides additional security through cryptographic functions.

These features help protect against low-level threats that could compromise the integrity of the instance at boot time.

References:

Oracle Cloud Infrastructure Documentation:Shielded Instances

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To ensure secure communication between database servers and OCI Object Storage, you should use aService Gateway. A Service Gateway enables instances in your VCN to privately access OCI services like Object Storage without traversing the public internet.

Security:The traffic between your database servers and Object Storage remains within the Oracle network, providing a secure and high-performance connection.

References:

Oracle Cloud Infrastructure Documentation:Service Gateway Overview

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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

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