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| Secure and Fast - Alibaba Cloud Elastic Compute Service (ECS) |
The Alibaba Cloud Elastic Compute Service (ECS) exam, specifically the 6th Generation Elastic Compute Service Technical Essentials, is a comprehensive certification that tests your understanding of Alibaba Cloud’s ECS. This exam covers topics such as the use of ECS, the features that make Alibaba Cloud’s 6th generation instances faster and more powerful, and how to choose the right instance type for your workload. It also includes understanding the ECS pricing model to optimize cost. The exam is conducted online and is available in English. This certification is ideal for system administrators, developers, and engineers.
Notice!
Always refer to the official Alibaba Documentaion for the most accurate and up-to-date information.
Exam Question
Single answer1.Which statement about Cloud Disk is WRONG?
B. It does not support cross-zone mounting
C. It can be mounted to only one instance at a time
D. It can be mounted to multiple instances at the same time
A cloud disk in Alibaba Cloud can only be mounted to one instance at a time. It cannot be mounted to multiple instances simultaneously. The other statements are correct. It can be mounted to any instances in the same zone and it does not support cross-zone mounting.
Single answer2.ECS is an important computing service on Alibaba Cloud. ECS is ____ .
B. Enhanced computing Service
C. Electronic Container Service
D. Exchange Container Service
ECS (Elastic Computing Service/ Elastic Compute Service) is an IaaS offering by Alibaba Cloud and provides high-performance, reliable, and scalable computing capacity in the cloud. ECS eliminates your need to invest in IT hardware up front, so that you can deploy applications efficiently. ECS allows you to scale up and down as your requirements change.
Single answer3.__ is a public IP address resource that you can purchase and possess independently. You can bind an EIP address to an ECS instance of the VPC network, a private SLB instance of the VPC network, or a NAT gateway.
B. EIP
C. ECS
D. PolarDB
An Elastic IP Address (EIP) is a public IP address resource that you can purchase and possess independently. You can bind an EIP address to an ECS instance of the VPC network, a private SLB instance of the VPC network, or a NAT gateway. It allows you to mask the failure of an instance or software by rapidly remapping the address to another instance in your account.
Single answer4.In ECS name ‘ecs.sn1.3xlarge’, what does ‘1’ in ‘sn1’ mean?
B. Instance generation
C. Instance size
D. Instance zone
In the ECS instance type ‘ecs.sn1.3xlarge’, ‘sn1’ refers to the instance family, and the ‘1’ in ‘sn1’ denotes the generation of the instance. So, ‘1’ stands for the first generation of the ‘sn’ instance family. Different generations may have different hardware specifications or performance characteristics.
Single answer5.In Alibaba Cloud, availability zone usually refers to a __ .
B. Data center
C. Security group
D. VPC
In Alibaba Cloud, an availability zone (AZ) usually refers to a data center. It’s a physical location where Alibaba Cloud’s resources run. Each availability zone is isolated, but the availability zones in a region are connected through low-latency links. This design ensures that applications remain highly available and reliable.
Single answer6.Currently Alibaba Cloud has three types Cloud disks available. Which is NOT one of them?
B. Standard SSD
C. Enhanced SSD
D. VPC
VPC (Virtual Private Cloud) is not a type of cloud disk. It’s a private, isolated network environment in Alibaba Cloud. The three types of cloud disks available in Alibaba Cloud are Ultra Disk, Standard SSD, and Enhanced SSD. These are used for data storage in cloud computing environments.
Single answer7.The __specifies one or more firewall rules, including the network protocol, port and source IP that are allow to access. E.g., 100.100.0.0/16, protocol=tcp, port=0/65535, policy=accept, nictype=intranet.
B. Image
C. Security Group
D. EIP
A Security Group in Alibaba Cloud specifies one or more firewall rules, including the network protocol, port, and source IP that are allowed to access. It acts as a virtual firewall for your instance to control inbound and outbound traffic. For example, it can specify rules like 100.100.0.0/16, protocol=tcp, port=0/65535, policy=accept, nictype=intranet.
True/False8.Alibaba Cloud Disk snapshot designed with 'Incremental Mechanism' so that only the changed parts between 2 snapshots will be recorded.
False
Alibaba Cloud Disk snapshots are designed with an ‘Incremental Mechanism’. After the first full snapshot, subsequent snapshots are incremental and contain only data blocks that have changed since the previous snapshot. This design helps to significantly reduce the size of data to be copied. Only the changed parts between two snapshots are recorded.
True/False9.EIP is a standalone product providing public IP.
False
An Elastic IP Address (EIP) in Alibaba Cloud is a standalone product that provides a public IP address. This public IP address is a resource that you can purchase and possess independently. You can bind an EIP to various resources like an ECS instance, a private SLB instance, or a NAT gateway, and you can unbind and rebind it as needed. This provides flexibility and control over your public IP addressing.
True/False10.Bare metal instance can support any stack, such as VMware, Xen, KVM, etc.
False
Bare metal instances in Alibaba Cloud are non-virtualized physical servers that provide you with direct access to their underlying resources. This means they can support any stack, including VMware, Xen, KVM, etc. They offer the flexibility and benefits of cloud computing, but with the isolation and performance of dedicated servers.
True/False11.Bare metal instance is also a virtual machine, but it has all the advantages of physical machines as well.
False
A bare metal instance is a physical server with a non-virtualized operating system. Unlike a virtual machine, a bare metal instance provides direct access to the underlying physical resources of the server, which can lead to better performance and efficiency. It combines the benefits of cloud computing, such as scalability and flexibility, with the high performance and capabilities of physical servers. This makes bare metal instances ideal for workloads that require high computational power, such as big data processing, machine learning, and high-performance computing (HPC).
True/False12.Vswitch is a component majorly used for setup subnet in one VPC.
False
A VSwitch, or Virtual Switch, in Alibaba Cloud is indeed a major component used to set up a subnet within a Virtual Private Cloud (VPC). It is a basic network device that logically isolates a physical network into smaller, logical networks (subnets) within the VPC. This allows you to launch cloud resources in a virtual network that you define. So, a VSwitch is primarily used for setting up a subnet in a VPC.
True/False13.ECS snapshot is incremental. Only the changed parts between two snapshots will be recorded.
False
ECS snapshots in Alibaba Cloud are incremental. This means that only the changed parts between two snapshots will be recorded. This approach helps to save storage space and reduces the time required to create and restore snapshots. It’s an efficient way to back up data at specific points in time.
Multiple answers14.Which of the following options are Alibaba Cloud supported ECS instance image type? (The number of correct answer: 3)
B. User-defined Image
C. Marketplace Image
D. Network Image
The correct answers are:
A. System Image: This is a type of image
provided by Alibaba Cloud. It includes the operating system and pre-installed
software.
B. User-defined Image: This is an image created by users. It
can be created from an existing ECS instance and can include the operating
system, pre-installed software, and the user’s data.
C. Marketplace Image: This is an image provided by an Alibaba Cloud marketplace partner. It
includes the operating system and software applications provided by the
partner.
So, the Alibaba Cloud supported ECS instance image types are
System Image, User-defined Image, and Marketplace Image. Network Image is not
a supported ECS instance image type in Alibaba Cloud.
15.Which of the following products can have public IP attached? (The number of correct answer: 3)
B. Server Load Balancer
C. ECS
D. VPN Gateway
The correct answers are:
A. NAT Gateway: A NAT Gateway in Alibaba Cloud can
have a public IP attached to it. It allows instances in a private network to
access the internet.
B. Server Load Balancer: A Server Load Balancer
(SLB) in Alibaba Cloud can also have a public IP attached. It distributes
traffic among multiple instances to improve the service capabilities of your
applications.
C. ECS: An Elastic Compute Service (ECS) instance in
Alibaba Cloud can have a public IP attached to it. This allows the instance to
communicate with the internet.
So, the products that can have a public IP
attached are NAT Gateway, Server Load Balancer, and ECS. VPN Gateway is not
typically associated with a public IP in the same way. It’s used to establish
secure, encrypted communications between different networks over the internet.