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Common Spanning Tree Protocols (STP): Lab 6: www.youtube.com/watch?v=g3UlDOX0ePA Need redundancy, but there will be a broadcast message!What will happen?Then how can prevent what is called a 'LOOP', AKA 'Broadcast Storm'?STP requires election to be performed firstThe Winner must be: 1-Lowest...

https://developer.cisco.com/site/sandbox https://github.com/openconnect/openconnect-gui/releases Data Path Virtualization: Virtual Routing & Forwarding (VRF):For Service ProvidersWith multiple clientsisolate each client in a 'Routing Table'for duplicated addressesrequires ISP's network MPLS...

Quality of Service (QoS): if traffic was more than bandwidth!if congestion WILL happen, can some traffic be more preferred than another?Generally, UDP will be preferred over TCP (TCP will automatically do A re-transmission)QoS Tools that will do the specific desired 'Preferring'. (Classification...

Tier 2 will be for Small/Mid networks: One building networkOnly 2 Tiers (Access and Aggregation)Access: The first layer facies/authenticates endpoint devicesConnects the endpoint to their gateways (aggregation)Aggregation: Aggregates/Communicates all the access layersRuns both Layer2 and Layer3...

ติดตั้งใช้ Instance Run Web Server ใน Subnet ใน VPC เมื่อพยายามเชื่อมต่อ Instance ผ่าน Browser โดยใช้ HTTP ทาง Internet พบว่า Connection Timeout สามารถตรวจสอบได้โดย: ตรวจสอบว่า VPC มี Internet Gateway และ Default Route 0.0.0.0/0 ชี้ไปหา Internet Gatewayตรวจสอบว่า Security Group...

ฐานข้อมูล MySQL, MariaDB, PostgreSQL, Oracle, SQL Server, และ Aurora ของ Amazon Relational Database Service (Amazon RDS) รองรับ Read Replica. Amazon DynamoDB เหมาะที่สุดสำหรับฐานข้อมูลที่ไม่สัมพันธ์ สถานะ Session, ตะกร้าสินค้า, และ Catalog สินค้า เป็นตัวเลือกที่ดีที่จะจัดเก็บไว้ใน Cache...

Lab: https://support.cloudmylab.com/.../vxlan-lab-on-eve-ng Spine = Fabric, Leaf = Line Card (LC) https://ithitman.blogspot.com/2018/05/configuring-otv-otv-configuration-and.html

Database กำลัง Run อยู่บน EC2 instance, Software มีการ Backup ข้อมูลที่ต้องใช้ Block Storage,EBS Cold HDD Volume มีต้นทุนน้อยที่สุด Amazon Simple Queue Service และ Elastic Load Balancing ช่วยอำนวยความสะดวกในการใช้งานสถาปัตยกรรมที่มีความเป็นอิสระต่อกัน (Loosely Coupled) Web มี SLA 99%...

Versioning:Can version files in Amazon S3It is enabled at the bucket levelSame key overwrite will increment the 'version': 1, 2, 3....It is best practice to version buckets: Protect against unintended deletes (ability to restore a version)Easy roll back to previous versionNotes: Any file that is...

Have an ASG that scales on demand based on the traffic going to new website: Triangle.Com. Would like to optimize for cost, so have selected an ASG that scales based on demand going through ELB. Still, want solution to be highly available so have selected the minimum instances to 2. Can further...

Stateful Web App: WordPress.com:Trying to create a fully scable WordPress websiteWant that website to access and correctly display picture uploadsUser data, and the blog content should be stored in a MySQL database. Use 5. architecture of Clothes.com If want to go big & scale up better & easier...

Have purchased 'coolcompany.com' on the AWS registrar and would like for it to point to lb1-1234.ap-southeast-1.elb.amazonaws.com. Alias sort of Route 53 record is POSSIBLE to set up for this. The DNS protocol does not allow to create a CNAME record for the top node of a DNS namespace...

Weighted Routing Policy:Control the % of the requests that go to specific endpointHelpful to test 1% of traffic on new app version for exampleHelpful to split traffic between two regionsCan be associated with Health Checks Latency:Redirect to the server that has the least latency close to...

EC2 User Data:It is possible to bootstrap our instances using an EC2 User data script.bootstrapping means launching commands when a machine startsThat script is only run once at the instance first startEC2 user data is used to automate boot tasks such as: Installing updates / softwareDownloading...

AWS Cost Optimization: How We Saved Over $1,000 By Building CloudForecast With Serverless And AWS Lambda: https://www.cloudforecast.io/blog/how-we-saved-money-using-aws-serverless-lambda http://awscostlabs.com How many instances could right-size?What benefits could get from using reserved...

Amazon ElastiCache Overview:The same way RDS is to get managed Relational Databases...Is to get managed Redis or MemcachedCaches are in-memory databases with really high performance, low latencyHelps reduce load off of databases for read intensive workloadsHelps make application statelessAWS...

Amazon Aurora:Is a proprietary technology from AWS (not open sourced)Postgres and MySQL are both supported as Aurora DB (that means drivers will work as if Aurora was a Postgres or MySQL database)Is 'AWS cloud optimized' and claims 5x performance improvement over MySQL on RDS, over 3x the...

AWS Cost Calculator Overview: Pricing Philosophy - High volume / low margin businesses are in core DNA:Trade CapEx for variable expense: Pay for what useEconomies of scale provide with lower costs: 80 price reductions since 2006Pricing model choice to support variable and stable workloads...

RDS Backups:Backups are automatically enabled in RDSAutomated backups: Daily full backup of the database (during the maintenance window)Transaction logs are backed-up by RDS every 5 minutes=> ability to restore to any point in time (from oldest backup to 5 minutes ago)7 days retention (can be...

Elastic File System:Mounting 100s of instances across AZEFS share website files (WordPress)Only for Linux Instances (POSIX) EFS has a higher price point than EBSCan leverage EFS-IA for cost savings Instance in us-east-1a just got terminated, and the attached EBS volume is now available...