Chapter 9 Troubleshooting Flashcards
There has been a steady increase in the response time of a cloud-hosted MySQL database application running on an IaaS deployment. When comparing current results against her baseline measurements, it shows that there has been a steady increase in the number of read requests over the past six months. What resource would you focus your troubleshooting efforts on?
Storage
What network service provides accurate time synchronization information?
NTP
Erving is asking you about cloud virtualization techniques and wants to know what a software representation of his three tier public cloud deployment is called. What is he referring to?
Templates
____ are software representations of network systems.
templates
By using templates, you can deploy complete cloud systems at a single time. This allows you to implement “one-click provisioning” instead of deploying and configuring individual cloud objects.
Chapter 9 (page 272)
____ ____ ____ allows all devices to synchronize to a central time service.
Network Time Protocol
Network Time Protocol (NTP) ensures that all devices report the same time to allow for synchronization of logging information.
Chapter 9 (pate 272)
____ can be defined as the maximum amount that something can contain or support
Capacity
Cloud capacity planning is the process of monitoring your operations and adding resources prior to them becoming exhausted. If you do not plan and add resources in a proactive manner, then you will, at some point run into resource starvation and performance issues.
Chapter 9 (page 273)
In the event of CPU capacity starvations, you can either ____ ____ or ____ ____.
reduce load
increase capacity
In the event of CPU starvation, the only option is to either reduce what is consuming the resources, admittedly not always a viable option, or add CPU resources.
Chapter 9 (page 274)
Expansion planning can be unexpectedly challenged by ____ and ____.
Mergers
Acquisitions
Growth in business operations or through mergers and acquisitions can challenge your expansion planning. The on-demand rapid provisioning model of cloud computing allows you to rapidly deploy additional resources to meet these needs.
Chapter 9 (page 276)
DNS maps the ____ ____ to an ____ ____.
domain name
IP addresses
DNS maps human-readable domain names to the IP addressing scheme used by the Internet. It’s just like a phone directory that tells you Bob is at 555-1212. So, if you, for example, change a server’s IP address or add a new load balancer to your deployment, there will be a DNS change or addition.
Chapter 9 (page 277)
After implementing a change, you should always ____ that it is working as expected.
validate
When performing a change management operation, you have learned that you must then test to make sure the change was implemented correctly and is operating as expected. This is referred to as validations. This is an important operation as it is critical that the change management process is followed and that when systems get put back into production, they are operating as expected.
Chapter 9 (page 280)
A centralized collection of device activity, known as ____ ____, assists in analyzing events during troubleshooting.
log files
____ backups are valuable for quick restoration of a failed cloud service.
Configuration
Proper network ____ allow for a visual representation of your cloud deployment and facilitate troubleshooting.
diagram
Common cloud resources in your deployment that may saturate over time include which of the following?(Choose three.)
A. RAM B. Power C. CPU D. Storage E. Monitoring F. IaaS
RAM
CPU
Storage
Resources such as the amount of RAM needed, CPU cycles, and storage capacity are common systems that may become saturated as your cloud compute requirements grow.
Connie has noticed an increase in the response time of the SQL database application she runs in her IaaS deployment. When comparing current results against her baseline measurements that she recorded when the database was deployed, she verified that there has been a steady increase in the number of read requests. What should she focus her troubleshooting on?
A. Memory
B. CPU
C. Storage
D. Networking
Storage
Database read and write requests utilize storage I/O and should be the focus of troubleshooting.
What are recommended procedures to take when preparing an outage response plan? (Choose three.)
A. Configuration backups B. SLA C. Documentation D. Diagram E. PaaS
Configuration backups
Documentation
Diagram
When troubleshooting, it is helpful to have access to configurations, documentations, and diagrams to provide information on your cloud deployment.
Jeff has been monitoring resource usage increases in his web server farm. Based on trending data he collected, there will be regular requirements to increase CPU capacity for his web servers as usage increases. Jeff wants to use the automation capabilities of his private cloud to automatically use the orchestration software to add CPU cores as required. What can he implement to automate this?
A. Puppet B. Chef C. Docker D. Autoscaling E. SaaS F. OpenStack G. Resilient-scaling
Autoscaling
Cloud autoscaling can dynamically add server capacity based on loading.
Sharon posted a new software update to her company’s popular smartphone application. After announcing the release, she has been monitoring her dashboard information and has noticed a large spike in activity. What cloud resource should she focus on?
A. CPU B. Network bandwidth C. RAM D. API E. Storage
Network bandwidth
A large number of users downloading a new application would cause an increase in network bandwidth usage.
Jim has added a new group of users to his IaaS based MySQL database. What license requirements does he need to investigate to ensure compliance? (Choose all that apply.)
A. Total connections B. Named users C. Current connections D. Usage metrics E. All of the above
All of the above
Any of these answers would be correct depending on his licensing agreement with the database provider.
Hank designed an application tier for his company’s new e-commerce site. He decided on using an IP subnet that uses a /28 IPv4 subnet. He is planning for a maximum of 14 servers. You are brought in as a cloud architect to validate his design. What other devices may be on this subnet other than the servers that would also require IP address assignments? (Choose three.)
A. SLA B. Default gateway C. DNS D. NTP E. API F. SNMP
Default gateway
DNS
NTP
In addition to the web servers, IP addresses may be required for the NTP and DNS services and the default gateway.
Dale has been monitoring storage volume utilization and is writing a change request to add capacity. He has decided to automate the volume allocation size. What cloud feature can he take advantage of?
A. SaaS
B. API
C. Elasticity
D. OpenStack
Elasticity
Elasticity allows for cloud services to expand and contract based on actual usage and would be applicable to increasing storage capacity.
Performance issues are measured by the load on a system. Which of the following should Jane be concerned about as she integrates her new marketing group into her PaaS cloud fleet?
A. APIs
B. Users
C. Cores
D. Licensing
Users
When troubleshooting cloud performance issues, the current number of users on the system can be important indicator of load. When there are high user counts, you can track what parts of your deployment are most heavily used and track the load on all the devices to see where the congestion points are.
Cloud capacity can be measured by comparing current usage to what?
A. Orchestration B. Automation C. NTP D. Baseline E. APIs
Baseline
A baseline measurement is used as a reference to determine cloud capacity increases and decreases.
SaaS orchestration systems are whose responsibility in the public cloud?
A. Customer
B. Provider
C. Automation vendor
D. DevOps
Provider
The cloud service provider owns its automation and orchestration systems, and they cannot be directly accessed by the customer.
During a recent downtime window, the server team was applying patches to an application, and the networking team was upgrading a router’s interface to 10 Gbps. When the network was down for the upgrade, the server team complained that they could not download the needed software patches. During a post-downtime status meeting, it was determined that which process should be modified to prevent this from happening in the future?
A. Orchestration
B. Automation
C. Change management
D. API calls
Change management
The change management process would need to be modified to prevent one change from affecting another that is takin place simultaneously.
Jerry is expanding a public subnet in his company’s e-commerce site. After performing the address change for all of his public-facing web servers, he tested connecting from a bastion host located offshore. He was unable to connect. What does he need to change to allow remote site to connect to the web server?
A. NTP
B. STP
C. DNS
D. API
DNS
The domain name system (DNS) records need to be changed to reflect the new IP address mapped to the domain name.
What are software representations of a cloud network?
A. Automation
B. Templates
C. Orchestration
D. APIs
Templates
Templates are software definitions of a cloud network and are used for automated deployments.
What application tracks a process from start to finish?
A. API
B. NTP
C. Workflow
D. Orchestration
Workflow
Workflow applications track process from start to finish and sequence the applications that are required to complete the process.
Capacity boundaries can cause which of the following? (Choose three.)
A. Application failure B. Latency C. API bends D. Request drops E. Workflow loops
Application failure
Latency
Request drops
Symptoms of reaching the capacity boundary of a service include the application failing, increased delays, and latency and requests to drop.
API request capacity is measure with what metric?
A. Total lookups per second
B. Connections per second
C. Burst capacity
D. IOPS
Connections per second
The common measurement for an API request is total connections performed each second.
Large batch processing jobs are common for which type of application?
A. DNS
B. NTP
C. Databases
D. Middleware
Databases
It is common for batch processing to be performed on database applications.
When configuring a machine image, what compute resources do you define? (Choose two.)
A. Slots
B. Cores
C. Clock speed
D. Threads
Cores
Clock speed
The total number of CPU cores and clock speed are common parameters to define when configuring a machine image.
What determines the size of a group of servers sharing the same network range?
A. Default gateway
B. DNS
C. NTP
D. Subnet
Subnet
The subnet mask determines the size of an IP network.
