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Oracle Cloud Infrastructure 2022 Developer Professional Sample Questions (Q52-Q57):
NEW QUESTION # 52
A leading insurance firm is hosting its customer portal in Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes with an OCI Autonomous Database. Their support team discovered a lot of SQL injection attempts and cross-site scripting attacks to the portal, which is starting to affect the production environment.
What should they implement to mitigate this attack?
- A. Network Security Groups
- B. Network Security Firewall
- C. Network Security Lists
- D. Web Application Firewall
Answer: D
Explanation:
Web Application Firewall (WAF):
Oracle Cloud Infrastructure Web Application Firewall (WAF) is a cloud-based, Payment Card Industry (PCI) compliant, global security service that protects applications from malicious and unwanted internet traffic. WAF can protect any internet facing endpoint, providing consistent rule enforcement across a customer's applications.
WAF provides you with the ability to create and manage rules for internet threats including Cross-Site Scripting (XSS), SQL Injection and other OWASP-defined vulnerabilities. Unwanted bots can be mitigated while tactically allowed desirable bots to enter. Access rules can limit based on geography or the signature of the request.
The global Security Operations Center (SOC) will continually monitor the internet threat landscape acting as an extension of your IT infrastructure.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/WAF/Concepts/overview.htm
NEW QUESTION # 53
You have written a Node.js function and deployed it to Oracle Functions. Next, you need to call this function from a microservice written in Java deployed on Oracle Cloud Infrastructure (OCI) Container Engine for Kubernetes (OKE).
Which can help you to achieve this?
- A. Oracle Functions does not allow a microservice deployed on OKE to invoke a function.
- B. Use the OCI Java SDK to invoke the function from the microservice.
- C. Use the OCI CLI with kubect1 to invoke the function from the microservice.
- D. OKE does not allow a microservice to invoke a function from Oracle Functions.
Answer: B
Explanation:
Invoking Functions
You can invoke a function that you've deployed to Oracle Functions in different ways:
1. Using the Fn Project CLI.
2. Using the Oracle Cloud Infrastructure CLI.
3. Using the Oracle Cloud Infrastructure SDKs.
4. Making a signed HTTP request to the function's invoke endpoint. Every function has an invoke endpoint.
Using the Fn Project CLI to Invoke Functions
To invoke a function deployed to Oracle Functions using the Fn Project CLI:
Log in to your development environment as a functions developer.
In a terminal window, enter:
$ fn invoke <app-name> <function-name>
Using SDKs to Invoke Functions:
If you're writing a program to invoke a function in a language for which an Oracle Cloud Infrastructure SDK exists, Oracle recommends you use that SDK to send API requests to invoke the function. Among other things, the SDK will facilitate Oracle Cloud Infrastructure authentication.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/Functions/Tasks/functionsinvokingfunctions.htm
NEW QUESTION # 54
How can you find details of the tolerations field for the sample YAML file below?
- A. kubectl explain pod.spec.tolerations
- B. kubectl describe pod.spec tolerations
- C. kubectl get pod.spec.tolerations
- D. kubectl list pod.spec.tolerations
Answer: A
Explanation:
kubectl explain to List the fields for supported resources
explainkubectl explain [--recursive=false] [flags]Get documentation of various resources. For instance pods, nodes, services, etc.
References:
https://kubernetes.io/docs/reference/generated/kubectl/kubectl-commands#explain
https://kubernetes.io/docs/reference/kubectl/cheatsheet/
NEW QUESTION # 55
What is the difference between blue/green and canary deployment strategies?
- A. In blue/green, current applications are slowly replaced with new ones. In canary, both old and new applications are In production at the same time.
- B. In blue/green, current applications are slowly replaced with new ones. In < MW y, Application ll deployed incrementally to a select group of people.
- C. In blue/green, application Is deployed In minor increments to a select group of people. In canary, both old and new applications are simultaneously in production.
- D. In blue/green, both old and new applications are in production at the same time. In canary, application is deployed Incrementally to a select group of people.
Answer: D
Explanation:
Blue-green deployment is a technique that reduces downtime and risk by running two identical production environments called Blue and Green. At any time, only one of the environments is live, with the live environment serving all production traffic. For this example, Blue is currently live and Green is idle.
https://docs.cloudfoundry.org/devguide/deploy-apps/blue-green.html
Canary deployments are a pattern for rolling out releases to a subset of users or servers. The idea is to first deploy the change to a small subset of servers, test it, and then roll the change out to the rest of the servers. ... Canaries were once regularly used in coal mining as an early warning system.
https://octopus.com/docs/deployment-patterns/canary-deployments
NEW QUESTION # 56
Your Oracle Cloud Infrastructure Container Engine for Kubernetes (OKE) administrator has created an OKE cluster with one node pool in a public subnet. You have been asked to provide a log file from one of the nodes for troubleshooting purpose.
Which step should you take to obtain the log file?
- A. It is impossible since OKE is a managed Kubernetes service.
- B. ssh into the node using public key.
- C. Use the username open and password to login.
- D. ssh into the nodes using private key.
Answer: D
Explanation:
Kubernetes cluster is a group of nodes. The nodes are the machines running applications. Each node can be a physical machine or a virtual machine. The node's capacity (its number of CPUs and amount of memory) is defined when the node is created. A cluster comprises:
- one or more master nodes (for high availability, typically there will be a number of master nodes)
- one or more worker nodes (sometimes known as minions)
Connecting to Worker Nodes Using SSH
If you provided a public SSH key when creating the node pool in a cluster, the public key is installed on all worker nodes in the cluster. On UNIX and UNIX-like platforms (including Solaris and Linux), you can then connect through SSH to the worker nodes using the ssh utility (an SSH client) to perform administrative tasks.
Note the following instructions assume the UNIX machine you use to connect to the worker node:
Has the ssh utility installed.
Has access to the SSH private key file paired with the SSH public key that was specified when the cluster was created.
How to connect to worker nodes using SSH depends on whether you specified public or private subnets for the worker nodes when defining the node pools in the cluster.
Connecting to Worker Nodes in Public Subnets Using SSH
Before you can connect to a worker node in a public subnet using SSH, you must define an ingress rule in the subnet's security list to allow SSH access. The ingress rule must allow access to port 22 on worker nodes from source 0.0.0.0/0 and any source port To connect to a worker node in a public subnet through SSH from a UNIX machine using the ssh utility:
1- Find out the IP address of the worker node to which you want to connect. You can do this in a number of ways:
Using kubectl. If you haven't already done so, follow the steps to set up the cluster's kubeconfig configuration file and (if necessary) set the KUBECONFIG environment variable to point to the file. Note that you must set up your own kubeconfig file. You cannot access a cluster using a kubeconfig file that a different user set up. See Setting Up Cluster Access. Then in a terminal window, enter kubectl get nodes to see the public IP addresses of worker nodes in node pools in the cluster.
Using the Console. In the Console, display the Cluster List page and then select the cluster to which the worker node belongs. On the Node Pools tab, click the name of the node pool to which the worker node belongs. On the Nodes tab, you see the public IP address of every worker node in the node pool.
Using the REST API. Use the ListNodePools operation to see the public IP addresses of worker nodes in a node pool.
2- In the terminal window, enter ssh [email protected]<node_ip_address> to connect to the worker node, where <node_ip_address> is the IP address of the worker node that you made a note of earlier. For example, you might enter ssh [email protected]
Note that if the SSH private key is not stored in the file or in the path that the ssh utility expects (for example, the ssh utility might expect the private key to be stored in ~/.ssh/id_rsa), you must explicitly specify the private key filename and location in one of two ways:
Use the -i option to specify the filename and location of the private key. For example, ssh -i ~/.ssh/my_keys/my_host_key_filename [email protected] Add the private key filename and location to an SSH configuration file, either the client configuration file (~/.ssh/config) if it exists, or the system-wide client configuration file (/etc/ssh/ssh_config). For example, you might add the following:
Host 192.0.2.254 IdentityFile ~/.ssh/my_keys/my_host_key_filename
For more about the ssh utility's configuration file, enter man ssh_config Note also that permissions on the private key file must allow you read/write/execute access, but prevent other users from accessing the file. For example, to set appropriate permissions, you might enter chmod 600 ~/.ssh/my_keys/my_host_key_filename. If permissions are not set correctly and the private key file is accessible to other users, the ssh utility will simply ignore the private key file.
References:
https://docs.cloud.oracle.com/en-us/iaas/Content/ContEng/Tasks/contengconnectingworkernodesusingssh.htm
NEW QUESTION # 57
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