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質問 1：
What is true for a virtual IP address in the context of keepalived? (Choose TWO correct answers.)
A. The distinct IP addresses of all backend servers are called virtual IP addresses.
B. Within the whole LVS cluster managed by keepalived, the virtual IP address never appears on any network interface.
C. Every server running keepalived has exactly one virtual IP address and cannot have any additional virtual IP addresses.
D. The virtual IP address is the address to which incoming connections are made in order to reach the load balancer.
E. keepalived uses VRRP to ensure the availability of the virtual IP address.
正解：D,E
質問 2：
Which of the following statements are true regarding IaaS computing instances? (Choose TWO correct answers.)
A. Instances may be created when needed and destroyed when they become obsolete.
B. Once created, computing instances are seldom deleted in order to ensure the accessibility of the instance's data.
C. The root file system of a computing instance is always persistent and can be accessed after the instance is destroyed.
D. Each and every user of an IaaS cloud has exactly one computing instance.
E. Creation of new instances can be automated by using scripts or APIs and service interfaces.
正解：A,E
質問 3：
Which of the following statements is true regarding a failover cluster?
A. Failover clusters always require storage that is shared by all nodes.
B. The core component of every failover cluster is a load balancer.
C. Every service may not be run more than once in a cluster.
D. In normal operation, services may be spread over all nodes.
E. Failover clusters provide scalability of a service beyond the capacities of one cluster node.
正解：D
質問 4：
When using the gatewaying/direct routing forwarding method of Linux Virtual Server (LVS), which of the following statements is true?
A. On the backend servers, all packets appear to originate from the IP address of the LVS host.
B. When using gatewaying/direct routing, only the round robin algorithm is available.
C. The link layer addresses of all backend servers must be included in the LVS configuration.
D. Every backend server must accept packets addressed to the IP address of the virtual service.
E. The default route of all backend servers must point to the LVS host.
正解：D
質問 5：
CORRECT TEXT
In the command
vzctl ____ 105 /usr/bin/apt-get install wget
which subcommand of vzctl is missing in order to install wget in the OpenVZ container 105?
正解：
exec, exec2
質問 6：
How can data in a computing instance in an IaaS cloud be permanently saved and accessed even after the recreation of the computing instance? (Choose TWO correct answers.)
A. By saving the data on persistent block devices that must be explicitly connected to the computing instance.
B. By saving the data to the memory of the computing instance using tmpfs.
C. By saving the data to /cloud/persistent/ which is provided in all common IaaS clouds.
D. By saving the data anywhere in the computing instance's file system.
E. By saving the data to object stores provided by a separate service in the cloud.
正解：A,E
What is true for a virtual IP address in the context of keepalived? (Choose TWO correct answers.)
A. The distinct IP addresses of all backend servers are called virtual IP addresses.
B. Within the whole LVS cluster managed by keepalived, the virtual IP address never appears on any network interface.
C. Every server running keepalived has exactly one virtual IP address and cannot have any additional virtual IP addresses.
D. The virtual IP address is the address to which incoming connections are made in order to reach the load balancer.
E. keepalived uses VRRP to ensure the availability of the virtual IP address.
正解：D,E
質問 2：
Which of the following statements are true regarding IaaS computing instances? (Choose TWO correct answers.)
A. Instances may be created when needed and destroyed when they become obsolete.
B. Once created, computing instances are seldom deleted in order to ensure the accessibility of the instance's data.
C. The root file system of a computing instance is always persistent and can be accessed after the instance is destroyed.
D. Each and every user of an IaaS cloud has exactly one computing instance.
E. Creation of new instances can be automated by using scripts or APIs and service interfaces.
正解：A,E
質問 3：
Which of the following statements is true regarding a failover cluster?
A. Failover clusters always require storage that is shared by all nodes.
B. The core component of every failover cluster is a load balancer.
C. Every service may not be run more than once in a cluster.
D. In normal operation, services may be spread over all nodes.
E. Failover clusters provide scalability of a service beyond the capacities of one cluster node.
正解：D
質問 4：
When using the gatewaying/direct routing forwarding method of Linux Virtual Server (LVS), which of the following statements is true?
A. On the backend servers, all packets appear to originate from the IP address of the LVS host.
B. When using gatewaying/direct routing, only the round robin algorithm is available.
C. The link layer addresses of all backend servers must be included in the LVS configuration.
D. Every backend server must accept packets addressed to the IP address of the virtual service.
E. The default route of all backend servers must point to the LVS host.
正解：D
質問 5：
CORRECT TEXT
In the command
vzctl ____ 105 /usr/bin/apt-get install wget
which subcommand of vzctl is missing in order to install wget in the OpenVZ container 105?
正解：
exec, exec2
質問 6：
How can data in a computing instance in an IaaS cloud be permanently saved and accessed even after the recreation of the computing instance? (Choose TWO correct answers.)
A. By saving the data on persistent block devices that must be explicitly connected to the computing instance.
B. By saving the data to the memory of the computing instance using tmpfs.
C. By saving the data to /cloud/persistent/ which is provided in all common IaaS clouds.
D. By saving the data anywhere in the computing instance's file system.
E. By saving the data to object stores provided by a separate service in the cloud.
正解：A,E
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