Cloud-based Architecture Design of Conventional Applications
Scalability generally means that a system or service can accommodate changes in scale by flexibly adjusting its architecture or resource configuration as business demand increases. Which of the following are examples of vertical scaling?
Choose two
AAdding read replicas added for an RDS instance
BDowngrading RDS instance specifications from 8 vCPUs and 32 GB to 4 vCPUs and 16 GB
CIncreasing the number of ECSs from 2 to 5
DUpgrading ECS specifications from 2 vCPUs and 4 GB to 4 vCPUs and 8 GB
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Cloud-based Architecture Design of Conventional Applications
In architecture design, security generally means the capacity of a product or service to remain operational or executable under specified conditions and for a defined period. This attribute reflects both the product’s availability and maintainability.
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Cloud-based Architecture Design of Conventional Applications
A customer bought compute-intensive Elastic Cloud Servers (ECSs) and deployed Linux applications to test services. The ECSs use pay-per-use billing. When no tests are running, some ECSs are stopped to reduce costs. After the ECSs are stopped, which of the following resources are not billed?
Choose two
AElastic Volume Service (EVS) disks
BElastic IP
CMemory
DvCPUs
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For processing high-quality images and videos, as well as performing big data analytics, memory-optimized Elastic Cloud Servers (ECSs) are recommended, including M8, M7, and M5 ECSs.
ATRUE
BFALSE
A user has purchased an Elastic Cloud Server (ECS) with the c6s.6xlarge.2 flavor on Huawei Cloud. Which of the following statements about this ECS flavor are correct?
Choose two
AThere are 24 vCPUs.
BThere is 64 GiB of memory.
CThere is 48 GiB of memory.
DThere are 12 vCPUs.
A customer purchased a general computing-plus Elastic Cloud Server (ECS) with the c9.xlarge.2 flavor on Huawei Cloud. This indicates that the ECS has 4 vCPUs and 16 GiB of memory.
ATRUE
BFALSE
Which statements accurately describe the ways databases can be classified?
Choose three
ADatabases can be classified as either open-source or commercial, depending on the business model.
BDatabases can be classified as either relational or non-relational, depending on their data structure.
CDatabases can be classified as either Online Transaction Processing (OLTP) or Online Analytical Processing (OLAP), depending on the applications they are used for.
DDatabases can be classified as either storage or computing, depending on their architecture.
After read replicas are created, they can serve read-intensive workloads for the primary instance and reduce its load. Which of the following statements about high-availability (HA) read replicas are true?
Choose three
AAn HA read replica must have the same configuration as its primary instance. Otherwise, it will be unavailable.
BRead replicas include single-node read replicas and HA read replicas.
CIf the physical server where the primary read replica resides fails, the standby read replica automatically takes over workloads from the primary read replica.
DIf a single-node read replica fails, the database proxy routes requests to other read replicas or the primary instance.
A cloud connection lets an on-premises data center access VPCs in multiple Regions, allowing users to use a single physical connection for high-speed access to cloud compute and storage resources in any Region.
ATRUE
BFALSE
Elastic Load Balance (ELB) provides dedicated and shared load balancers. Which of the following statements about shared load balancers is false?
Choose two
AWhen backend servers receive requests from a shared load balancer, source IP addresses are translated into those in 100.125.0.0/16.
B“Transfer Client IP Address” is enabled for Layer 4 and Layer 7 listeners by default. Users do not need to manually enable it.
CAfter backend servers are added to a load balancer, users must check the security group rules and network ACL rules of the backend servers.
DIf “Transfer Client IP Address” is enabled for the Layer 4 listeners of a shared load balancer, each source IP address will be translated into an IP address in 100.125.0.0/16.
DNAT rules allow servers in a VPC to provide services that are accessible from the Internet. DNAT lets users bind an EIP to a public NAT gateway and supports both IP address mapping and port mapping. After requests are received on a particular port using a particular protocol, the public NAT gateway can use port mapping to forward them to a particular port on the target server. Users can also configure an EIP for a server. The public NAT gateway can then use IP address mapping to forward all requests addressed to that EIP to a particular server. This enables multiple servers to share the same EIP and bandwidth, reducing bandwidth costs.
ATRUE
BFALSE
A company plans to use a Virtual Private Network (VPN) to enable communication between its on-premises data center and multiple VPCs on Huawei Cloud. Which statement about VPN is false?
AVPN connections use IKE and IPsec to encrypt transmitted data, ensuring service data security.
BA VPN consists of a VPN gateway, a customer gateway, and VPN connections. VPN connections are secure channels between the VPN gateway and the customer gateway.
CThere are two types of VPNs: Site-to-Cloud VPN (S2C VPN) and Point-to-Cloud VPN (P2C VPN). S2C VPN uses IPsec, and P2C VPN uses SSL.
DVPN connections can be created between VPN gateways in the same region on the cloud for cross-VPC communications.
Each EIP can be associated with only one cloud resource at a time, and the EIP and that resource must be in the same Region.
ATRUE
BFALSE
Both Cloud Connect and Direct Connect can establish high-speed, low-latency networks. Which of the following statements regarding their differences is false?
ADirect Connect establishes a high-speed, low-latency, stable, and secure dedicated network connection that links an on-premises data center to the cloud.
BUsers can use Direct Connect to connect an on-premises data center to the cloud, and then use Cloud Connect to connect VPCs in different regions, so that the on-premises data center can access the VPCs across regions.
CCloud Connect can work with EIPs to enable private communications between on-premises servers and cloud instances.
DCloud Connect provides both cloud connections and central networks to connect VPCs in different regions. It can also work with Direct Connect to create a hybrid cloud network.
After a company migrates its workloads to the cloud, multiple cloud servers in a virtual private cloud (VPC) need Internet access. However, the EIPs associated with the cloud servers might be attacked. An engineer suggests adding multiple EIPs when configuring DNAT rules. If one EIP is attacked, the other EIPs can continue to provide services and keep operations running normally.
ATRUE
BFALSE
Scalable File Service (SFS) supports general-purpose file systems that provide users with scalable, high-performance file storage. Which of the following statements regarding general-purpose file systems are true?
Choose three
ABy default, a general-purpose file system has no capacity limit. Users can configure a capacity limit for a general-purpose file system as required.
BBefore a general-purpose file system is deleted, it has to be unmounted from the operating system (OS), and the OS needs to be restarted. Otherwise, the file system cannot be deleted.
CWhen mounting a general-purpose file system to Elastic Cloud Servers (ECSs), users must ensure that they have configured a VPC endpoint. Otherwise, the file system cannot be mounted and accessed.
DWhen mounting a general-purpose file system, users need to check whether the NFS software package is installed. If not, they have to install the software first.
After a user attaches a newly created data disk to an Elastic Cloud Server (ECS), the Elastic Volume Service (EVS) disk must be initialized—including creating partitions and file systems and mounting the partitions—before it can be used. Which of the following statements about disk initialization is false?
AIf the EVS disk capacity is less than 2 TiB, the user can create either MBR or GPT partitions.
BIn Linux, an initialized EVS disk is not automatically mounted. The disk can be mounted by using the mount command or configuring auto mount at system start.
CThe MBR and GPT partition tables used in Linux are not supported in Windows. NTFS, FAT, or exFAT partition tables are recommended for Windows.
DIn Linux, users can use the fdisk or parted tool to initialize EVS disks.
Parallel File System (PFS) is an OBS high-performance file system. In a parallel file system, every directory level in the access path is handled as an independent file. For example, in the path /dir01/dir02/example.txt, /dir0l/, /dir01/dir02/, and /dir01/dir02/example.txt are all objects simulated by using files. These are special file representations in object storage.
ATRUE
BFALSE
A small or micro enterprise intends to use Huawei Cloud Elastic Cloud Server (ECS) to deploy a small web-based forum for technical and experience sharing and enterprise promotion. The enterprise wants data to be stored separately from ECSs and to support independent access. Which of the following storage services are recommended as cost-effective options?
Choose two
AScalable File Service (SFS)
BObject Storage Service (OBS)
CDedicated Distributed Storage Service (DSS)
DElastic Volume Service (EVS)
Elastic Volume Service (EVS) offers several disk types, each suited to different workloads. Which of the following statements about EVS disk types and their use cases are false?
Choose two
AExtreme SSD disks are suitable for general workloads, latency-insensitive applications, and common development and testing.
BGeneral Purpose SSD disks are suitable for mainstream high-performance, low-latency interactive applications, such as typical enterprise office applications and development and testing.
CHigh I/O disks are suitable for workloads that require ultra-large bandwidth and ultra-low latency, such as mission-critical databases and AI.
DCommon I/O disks are suitable for applications with small workloads that do not demand much write performance but do require robust read performance.
The Anti-DDoS “black hole” indicates that a server or ECS is under an attack whose traffic exceeds what basic defense can handle. When this threshold is exceeded, the platform activates black-hole access and directs the attack traffic to the black hole for traffic scrubbing.
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