OCI Foundations 2020 Associate Certification | 1Z0–1085–20 | Preparation…
Oracle Cloud Infrastructure Foundations 2020 Associate Certification | 1Z0–1085–20 | Preparation Guide
Table Of Contents
Introduction
This certification provides candidates with foundational knowledge of core cloud computing concepts and an understanding of those services in Oracle Cloud Infrastructure.
Target Audience
Designed for professionals who is new to the cloud computing or want to know about Oracle Cloud Infrastructure.
Certification Details
Certification Name: Oracle Cloud Infrastructure Foundations 2020 Associate
Exam Number: 1Z0–1085–20
Format: Multiple Choice
Exam Duration: 105 minutes
Number of Questions: 60
Passing Score: 68%
Certification Topics
Preparation
Oracle University online learning platform provides a learning path for preparing to this certification and you can access it by following the below link:
It comes with video tutorials for the certifications syllabus and a set of 25 questions practice exam too.
Notes
This section contains the notes for the certification topics for quick reference and its the biggest section in this article :) If you want, you can skip it and jump to the next section.
OCI Architecture
OCI Regions — 21 Available + 15 Planned; Commercial, Govt, Microsoft Azure Interconnect
Region — Localized Geographical area comprised of 1 or more AD
Availability Domains — One or more fault-tolerent, isolated DC located within a region, but connected to each other by low latency, high bandwidth network; Do not share physical infra
Fault Domains — Grouping of hardware and infrastructure with in an AD to provide anti-affinity(logical data center); 3 FD per AD; Do not share SPOHF; change procedures are isolated at FD
One AD Regions — within one year second AD or region will be made available
Choosing Region — Location, Data Residency & Compliance, Service Availability
Avoid SPOF — Design architecture to deploy instances that perform same tasks in different FD or different AD for multiple AD regions
Data Guard — Data replication across AD
HA Design — FD, AD, Region Pair
Compartments — collection of related resources; helps to isolate and control access to resources; Tenancy/Root compartment; Compartment Network, Compartment Storage etc;
Each resource belong to a single compartment; Resource can interact with other resource in diff compartment; Resources and compartments can be added/deleted anytime;
Resources can be moved from one to another; Resources from multiple regions can be in the same compartment; Compartments can be nested (6 levels deep); can give group of users access to compartments by writing policies; Analyze cost and assign budget for resources in compartments
OCI Compute Services
Bare Metal — Code, App Container, Language Runtime, OS, Virtualization; No virtualization
Dedicated Virtual Hosts — Code, App Container, Language Runtime, OS;
Virtual Machines — Code, App Container, Language Runtime, OS; Guset on a host server with hypervisor based virtualization;
Container Engine — Code, App Container (Docker);
Functions — Code; Consumption based pricing
BM — Direct Hardware access; Single Tenant server; Use Case: Performance intensive workloads (DB), workloads not virtualized; workload that require specific Hypervisor, workload requires BYO licensing (SQL, Exchange etc)
VM — Multi-tenant VMs; Use cases: to control all aspects of env, to deploy legacy app running on windows/linux, to move apps from on-premise to OCI
Dedicated Virtual Host — Single-tenant VMs
Instance Basics — various instance sizes(CPU, RAM, Bandwidth); Support both Intel and AMD processors; Provide GPU and HPC instance options(RDMA); instance placed on virtual network with powerful connectivity options; Depends on other OCI services such as Block volume (Boot(OS)/Data) and VCN(Virtual Nic)
Vertical Scaling — Scale up/Down; Downtime required;
Autoscaling — Enable large scale deployment of VM from a single gold image with automatic configuration; Scale out/Scale in; If one VM fails, others will keep working; based on metrics; Running Instance -> Config (Gold Image — OS image, metadata, shape, vNICs, Storage, subnets) -> Instance Pool (put in diff ADs, Manage all together) -> Scaling Rule
How to Deploy containers? 1. Manually SSH into machines and run Docker 2. Scripting or Config mgmt tools 3. Orchestration Systems
Oracle Kubernetes Engine — K8S; Containers in Pods, Pods in Node (Instances); OKE and OCIR
Functions — small but powerful blocks of code that generally do one simple thing; stores as Docker image; invoked in response to a CLI command or signed HTTP request Push container to Registry -> Configure Function Trigger -> Code runs only when triggered -> Pay for code execution time only; based on FN project
OCI Storage Services
Block Volume, Local NVMe, File Storage, Object Storage, Archive Storage
Storage Requirements — Persistent vs Non-persistent, What type of data?(Database, videos, audio, photos, text), Performance (max capacity, IOPS, throughput), Durability (Copies of data), Connectivity (Local vs network, How does apps access the data), Protocol (Block vs File vs HTTPs)
Block Storage — Hard drive in a server(on a remote chassis); stored on device in fixed sized blocks (512 bytes); Access by OS as mounted drive volume; Storage for compute services; 2 types (Boot Volume/OS Disk, Block Volume/Data Disks) Use cases — Databases, Exchange, VMWare, Server Boot. Block volume stores replica of data in 3 separate FDs; No need to configure s/w based protection(RAID-10 etc); Periodic backups (automated schedule backups);
Block volume backup — Complete point-in-time snapshot copy of block volumes; Encrypted and stored in Object Storage and can be restored as new volumes to any AD within same region; Can copy block volume backups from one-region to another(X-Region Backup); Backups can be scheduled
Block Volume Tiers — (50 GB — 32 TB, up to 32 volumes/instance (32x32=1PB); Data encrypted at rest and in-transit(oracle managed/customer managed key) * Basic(2 IOPS/GB, 240 KB/s/GB Throughput); throughput intensive workloads with large sequential I/O such as big data & streaming, log processing and data warehouses. * Balanced (60 IOPS/GB, 480 KB/s/GB); most workloads that perform random I/O such as boot disks * High Performance (75 IOPS/GB, 600 KB/s/GB); workload require best possible performance including large DB’s
Local NVMe — temp storage, locally attached to compute instance; app require high performance local storage; Use case — NoSQL DB, In-memory DB, Scale-out txn DB, Data warehousing. Storage non-persistent but survives reboot. OCI uses NVMe(Non-Volatile Memory Express) interface for very high performance. OCI provides no RAID, snapshots, backup capabilities
File Storage — Hierarchical collection of docs organized into named directories which are themselves structured files. Distributed file systems make distributed look exactly like local file systems. Distributed file standards — NFS and SMB (provide access over networks). FSS — supports NFS v.3; Data protection: Snapshots(10000 per file system); Security (Data at rest, in-transit encryption). Use cases: Oracle Apps, HPC, Big Data and Analytics, General purpose file systems. FS — replicates data in 3 FDs; can take snapshot and restore snapshot
Object Storage — All data, managed as objects; Each object stored in a bucket, relies on standard HTTP verbs; flat structure; OSS — An internet-scale, high performance storage platform; ideal for unstructured data; regional service; storage classes (hot/cold); Use cases: content repo for data, images, logs & video etc; Archive/Backup, Storing log data for analysis; Storing large datasets; Big Data/Hadoop storage OS replicates in 3 FDs; stores replica of data in more than AD
OS Tiers — Standard Storage Tier(Hot) Fast, immediate, and frequent access; Data retrieval in instances; Always serves the most recent copy of the data when retrieved; Standard buckets can’t be downgraded to archive storage. Archive Storage Tier (Cold) Seldom or rarely accessed data but must be retained and preserved for long periods of time; 10x cheaper than standard tier ($0.0026 vs $0.0255 Gb/month); 90 days min retention period; objects needs to be restored before download; TTFB after restore request is made: 4 hours; Archive bucket can’t be upgraded to Standard
OCI Network Services
Virtual Cloud Network — software defined private network that you setup in OCI; Enable OCI resources to communicate
VCN address space — Address space 10.0.0.0/16; Every resource will get its own unique private IP address; subnet — divide VCN into one or more sub networks;
Gateways — IGW; Public Subnet(DMZ);
NAT Gateway (Blocks inbound connection)
DRG — virtual router that provides a path for private traffic between your VCN and destinations other than the internet; DRG to establish a connection with on-premises network via IPsec VPN, FastConnect(private, dedicated connectivity)
Service Gateway — Communication to public OCI services — access without using internet
Peering — process of connecting multiple VCN; Local VCN peering (same region); Remote VCN peering (Different Region) No transitive peering VCN Security — Firewall rules (Subnet layer); Network Security Group (VNIC layer)
Load Balancer — sits between client and backends; performs tasks such as: Service Discovery, Health Check, Algorithm. LB Benefits — Fault tolerance and HA; Scale; Naming abstraction. LB Types — Public LB, LB pair for HA
OCI IAM
IAM — Identities, Permissions
Principals — IAM entity that is allowed to interact with OCI resources; IAM users and Instance Principals
IAM Users and Groups — 1st IAM user is default admin; Users -> Groups -> at least one policy
Instance Principals — let instances make API calls against other OCI services
Network Admin, Storage Admin etc — Policies
Authentication — deals with user identity; Username/Password, API Signing key, Auth Tokens
Authorization — actions performed by principals; Policies; Allow group <> to <> resource-type in tenancy/compartment where conditions <> Policies — Allow to in where Verb — inspect(list resources), read(inspect_user-specified metadata), use (Read+Update), manage(all permissions) Resource type — all-resources, database-family, instance-family, object-family etc
Common Policies — Network admin(manage virtual-network-family), Instance Launchers(manage instance-family, use volume-family, use virtual-network-family)
OCI Database Services
OCI DB Options — VM (Fast Provisioning), Bare metal(Fast performance), RAC (Managed HA), Exadata DB systems(Managed Exadata Infra), Autonomous — Shared/Dedicated(Self-driving, Self-Securing, Self-Repairing)
DB Systems — Managed DB systems, Complete Lifecycle automation (Provisioning, Patching, Backup & Restore), HA and DR (RAC & Data Guard), Scalability (Dynamic CPU and Storage Scaling), Security (Infra(IAM, VCN, Audit), Database(TDE, Encrypted RMAN backup/Block volume encryption)), BYOL
DB Systems Operations — Launch, start, stop or reboot DB systems(Billing continues in stop state for BM DB systems), Scale (CPU cores (BM DB), Storage(VM DB)), Patching (2 step process, For Exadata and RAC patches are rolling)
DB Systems Backup — Manual/Automatic Backups, Auto backups written to Oracle owned Object storage buckets, Runs between midnight — 6 AM in DB system time zone, Preset retention periods: 7, 15, 30, 45 and 60 Days; Recover DB from backup stored in Object storage(Last known good state, Timestamp specified, Using SCN)
DB Systems HA and DR — Oracle Data Guard — survive disasters and data corruptions (maintain sync between primary and standby DB); Active Data Guard (adv features for data protection and availability, included in Extreme Performance edition and Exadata service); 2 modes — switchover(planned migration, no data loss), Failover (unplanned, min data loss)
MAA — Primary and standby DB can be either a single-instance oracle db or RAC db
Autonomous Databases — Fully managed DB with 2 workload types; TP, DWH; Deployment options — Dedicated/Shared; Automates backing up DB, patching w/o downtime, Upgrade DB, Tune DB
OCI Security
Shared Security Model — OCI upto virtualization; Customer (Patching app and OS, OS config, IAM, Network security, Endpoint protection, Data Classification and Compliance)
Security Services — OCI IAM, MFA, Federation, Storage and DB services, Data Safe, Key Management, OS Management Service, Bare Metal, Dedicated VM hosts, VCN, NSG, SL, WAF
IAM — RBAC; Authentication -> OCI IAM -> Authorization -> Compartments -> Resources; MFA; SSO using IDP
Data Protection — Block volume (Data enc at-rest/in-transit, BYOK) File Storage (Data enc at-rest/in-transit, BYOK) Object Storage (Data enc at-rest, BYOK, Private Buckets, Pre authenticated requests) Database(TDE, Data safe, Data Vault) Key Management (BYOK, use HSM)
OS & Workload isolation — OS Mgmt service configured by default for Oracle Linux; Network protection — Tiered subnet strategy for VCN, Gateways, Security Lists, NSG, OCI WAF (XSS, SQL Injection), Protection against layer 7
OCI Pricing and Billing
Pricing Models — Pay as you go; Monthly Flex (Universal Credits) $1000 monthly charge/12 months -> 33% — 60% savings vs PAYG; BYOL (apply on-premise Oracle license); All OCI region have same pricing;
Block volume (Storage cost $0.0255 per GB/month, Performance Cost (VPU/GB) — NA for Basic, 10 VPU at $0.0017 for balanced, 20 VPU at $0.0034 for higher performance); Data Transfer costs — Ingress/Egress free b/w data transfers, Egress charge for different regions; To and from internet (Egress charged), DRG/FastConnect both Ingress/Egress free
Pricing Example — Outbound Data Transfer 10 TB free
Billing — Cost Tracking Tags, Cost Analysis, Budgets, Alert every 15 mins, Usage reports (automatically generated CSV file, 24 hrs data, retained for 1 year)
Free Tier — $300 free credit for 30 days; upto 8 instances, 5TB storage
Always Free — 2 Oracle Autonomous DB, 2 OCI Compute VMS, Block, Object and Archive Storage, LB and Data egress, Monitoring and Notifications
Certification Appointment Booking
Please follow below steps to book appointment for the certification exam:
Select Sign In under Oracle on top right.
Use your existing Pearson VUE account to log in or create a new account and log in.
Select Proctored Exam.
Type 1Z0–1085–20: Oracle Cloud Infrastructure Foundations 2020 Associate and select Go.
Select how you want to take the exam and follow the prompts.
System Test (Prior to Exam Day)
I highly recommend you to perform system test from the same computer and location you will be testing from on exam day. Please follow below link for further steps:
http://www.pearsonvue.com/oracle/op/
Ensure you have administrative rights on your computer to be able to download the software and proceed further with the prompts.
On Certification Day
The certification will be open 30 minutes before the booked time and please be ready at least before 15 minutes so that you will be ready for the booked time after completing the admission process.
Click on your exam under ‘Purchased Online Exams’
Click “Begin” and proceed through the self check-in process and wait for a Proctor to connect with you
Some tips…
There are totally 60 questions and you have 105 minutes — so you have approximately 2 minutes for each question. So take your time to read the question carefully before choosing the answer and also review the each question once you completed all questions.
Pass percentage is 68% — so even though you give wrong answers to 19 questions, you still can pass the exam :) Hence don’t panic if you don’t know answers for few questions.
Read questions properly, sometimes they are tricky and you can often miss some minute details which will be a key point to find the correct answer.
Few topics to concentrate more are OCI support, Databases, Storage and Network. You might comparatively get more questions on these topics.
If you take the exam from home, then you are video proctored. So strictly follow the PearsonVue guide for taking the exam.
Good that you read the whole article; hopefully it will be useful for you.
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