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NEW QUESTION: 1
응용 프로그램은 데이터베이스 계층에 Amazon RDS MySQL 클러스터를 사용합니다. 데이터베이스 증가는 인스턴스의주기적인 크기 조정이 필요합니다. 현재 관리자는 일주일에 한 번 수동으로 사용 가능한 디스크 공간을 확인합니다.
이 프로세스를 어떻게 개선 할 수 있습니까?
A. Amazon CloudWatch를 사용하여 저장 용량을 모니터링합니다.
B. AWS CloudTrail을 사용하여 저장 용량을 모니터링하십시오.
C. 데이터베이스에 가장 큰 인스턴스 유형을 사용하십시오.
D. 자동 크기 조정을 사용하여 저장소 크기를 늘립니다.
Answer: D
NEW QUESTION: 2
Which of the following statements are true when VSS is implemented on a distribution layer switch pair in a campus network? (Choose two.)
A. Aggressive mode UDLD should be used to monitor link integrity.
B. VSS eliminates the need to use an FHRP for convergence.
C. Loop Guard should be disabled throughout the VSS-enabled network.
D. Each access layer switch uses a single, active physical uplink to the distribution switch pair.
E. MEC trunk links should not be configured using the auto-desirable option.
Answer: B,C
Explanation:
Explanation/Reference:
Section: Enterprise Network Design Explanation
Explanation:
When Virtual Switching System (VSS) is implemented on a distribution layer switch pair in a campus network, it eliminates the need to use a First Hop Redundancy Protocol (FHRP) for convergence and Loop Guard should be disabled throughout the VSS-enabled network. VSS is a Cisco device virtualization feature that can enable a pair of switches to function as a single logical switch. The switch pair is connected by an EtherChannel bundle known as a Virtual Switch Link (VSL). The trunk links in a VSL bundle should be configured as auto-desirable or desirable-desirable in order to ensure a consistent trunk state across the link.
With VSS, access layer devices can connect to the switch pair using several active, physical uplinks that are bundled together into a single logical link using Multi-chassis EtherChannel (MEC). Because all of the links in the bundle to the distribution switch pair are active, each access layer device is reduced to having a single logical link to the virtual distribution layer switch, therefore, Spanning Tree Protocol (STP) is no longer required to prevent loops. In addition, since there is only a single logical link to the virtual distribution layer switch, the access layer device can load balance traffic across all of its active links and the device does not need to rely on an FHRP for convergence if a link in the MEC bundle fails.
Cisco recommends disabling the Loop Guard feature in a VSS-enabled campus network to mitigate the possibility that active links in an EtherChannel bundle are incorrectly placed into a root-inconsistent state.
In addition, Cisco recommends configuring MEC trunk links as auto-desirable or desirable-desirable to mitigate the potential for configuration errors that might occur during cycles of change management.
In a Layer 2 switched hierarchical design, only the access layer of the enterprise campus module uses Layer 2 switching exclusively. The access layer of the enterprise campus module provides end users with physical access to the network. In addition to using VSS in place of FHRPs for redundancy, a Layer 2 switching design requires that inter-VLAN traffic be routed in the distribution layer of the hierarchy. Also, STP in the access layer will prevent more than one connection between an access layer switch and the distribution layer from becoming active at a given time.
In a Layer 3 switching design, the distribution and campus core layers of the enterprise campus module use Layer 3 switching exclusively. Thus a Layer 3 switching design relies on FHRPs for high availability. In addition, a Layer 3 switching design typically uses route filtering on links that face the access layer of the design.
Because access layer devices provide hosts and other devices with access to the network, the access layer is the ideal place to perform user authentication and to institute port security. High availability, broadcast suppression, and rate limiting are also characteristics of access layer devices.
Aggressive mode UniDirectional Link Detection (UDLD) should not be used to monitor MEC link integrity.
Aggressive mode UDLD can cause false positives when CPU utilization is particularly high or while a line card is initializing. These false positives could place MEC links into an error-disabled state, disrupting the link on both switches. Cisco recommends using normal mode UDLD to monitor MEC links because its default timer values are much less likely to produce false positives when checking link viability.
Reference:
CCDA 200-310 Official Cert Guide, Chapter 3, Distribution Layer Best Practices, pp. 97-99 Cisco: Campus 3.0 Virtual Switching System Design Guide: VSS Enabled Campus Design
NEW QUESTION: 3
An HP Comware switch is controlled by a team of HP VAN SDN Controllers. The controllers have these roles within the region that contains the switch.
Controller 1 = Master
Controller 2 = Primary slave
Controller 3 =Secondary slave
A failed network connection causes Controller 1 to lose contact with the switch. Controller 2 and Controller
3 can still reach all the controlled devices. Controller 1 is still up and has contact with other controllers and switches. How does the team handle this situation?
A. Controller 2 becomes the master for all switches in the region, and Controller 1 becomes the primary slave for the region.
B. Controller 1, as master, contacts OpenFlow-enabled devices near the switch and attempts to repair the connection.
C. Controller 2 becomes the master for this switch, although Controller 1 remains master for other switches.
D. Controller 1, as master, removes the switch from any active flows and sends updated flows to Controller 2 andController 3.
Answer: C
Explanation:
Explanation/Reference:
Explanation:
Device Owner Service triggers the failover operation in two cases:
* Device disconnect (the scenario here in this question): The Device Owner Service instance in a controller is notified of a communication failure with network device(s) through the Controller Service notifications. It instantly communicates with all Device Owner Service instances in the team to determine if the network device(s) in question are still connected to any of the backup (slave) controllers within the team. If that is the case, it elects one of the slaves to assume the master role over the affected network device(s).
The first slave will be chosen as master if it still has connectivity with the device(s), and the second slave will be chosen as master if neither the configured master or first slave have connectivity with the device(s).
* Controller failure: The Device Owner Service detects a controller failure in a team through notifications from the teaming subsystem. If Device Owner Service determines that the failed controller instance was a master for any devices within a region, it immediately elects an appropriate backup (slave) controller to assume the master role over the affected devices.
References:
http://h22208.www2.hpe.com/eginfolib/networking/docs/sdn/sdnc2_6/5998-8472admin/content/s_curl- team-config.html#s_region-failover
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