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NEW QUESTION: 1
A. Option A
B. Option B
C. Option C
D. Option D
Answer: B
Explanation:
Explanation
Explanation
When you connect an IP phone to a switch using a trunk link, it can cause high CPU utilization in the switches. As all the VLANs for a particular interface are trunked to the phone, it increases the number of STP instances the switch has to manage. This increases the CPU utilization. Trunking also causes unnecessary broadcast / multicast / unknown unicast traffic to hit the phone link.
In order to avoid this, remove the trunk configuration and keep the voice and access VLAN configured along with Quality of Service (QoS). Technically, it is still a trunk, but it is called a Multi-VLAN Access Port (MVAP). Because voice and data traffic can travel through the same port, you should specify a different VLAN for each type of traffic. You can configure a switch port to forward voice and data traffic on different VLANs. Configure IP phone ports with a voice VLAN configuration. This configuration creates a pseudo trunk, but does not require you to manually prune the unnecessary VLANs.
The voice VLAN feature enables access ports to carry IP voice traffic from an IP phone. You can configure a voice VLAN with the "switchport voice vlan ..." command under interface mode. The full configuration is shown below:
Switch(config)#interface fastethernet0/1
Switch(config-if)#switchport mode access
Switch(config-if)#switchport access vlan 10
Switch(config-if)#switchport voice vlan 20
Reference:
http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4500-series-switches/69632-configuring-cat-ip-pho Configure the Switch Port to Carry Both Voice and Data Traffic When you connect an IP phone to a switch using a trunk link, it can cause high CPU utilization in the switches. As all the VLANs for a particular interface are trunked to the phone, it increases the number of STP instances the switch has to manage. This increases the CPU utilization. Trunking also causes unnecessary broadcast / multicast / unknown unicast traffic to hit the phone link.
In order to avoid this, remove the trunk configuration and keep the voice and access VLAN configured along with Quality of Service (QoS). Technically, it is still a trunk, but it is called a Multi-VLAN Access Port (MVAP). Because voice and data traffic can travel through the same port, you should specify a different VLAN for each type of traffic. You can configure a switch port to forward voice and data traffic on different VLANs. Configure IP phone ports with a voice VLAN configuration. This configuration creates a pseudo trunk, but does not require you to manually prune the unnecessary VLANs.
The voice VLAN feature enables access ports to carry IP voice traffic from an IP phone. The voice VLAN feature is disabled by default. The Port Fast feature is automatically enabled when voice VLAN is configured.
When you disable voice VLAN, the Port Fast feature is not automatically disabled.
NEW QUESTION: 2
Which of the following is not a major task of Exit criteria?
A. Checking test logs against the exit criteria specified in test planning.
B. Writing a test summary report for stakeholders.
C. Assessing if more tests are needed.
D. Logging the outcome of test execution.
Answer: D
NEW QUESTION: 3
사용자가 사전 서명된 URL을 사용하여 프라이빗 S3 버킷에서 파일을 다운로드할수 있는 EC2 인스턴스에서 실행중인 애플리케이션이 있습니다. URL을 생성하기 전에 응용 프로그램은 S3에서 파일이 있는지 확인해야 합니다.
애플리케이션은 어떻게 AWS 자격 증명을 사용하여 S3 버킷에 안전하게 액세스해야 합니까?
A. S3 버킷에 대한 목록 액세스를 허용하는 권한이 있는 애플리케이션의 IAM 사용자를 생성합니다. 인스턴스를 IAM 사용자로 시작하고 EC2 인스턴스 사용자 데이터에서 IAM 사용자의 자격 증명을 검색하십시오.
B. S3 버킷에 대한 목록 액세스를 허용하는 권한이 있는 애플리케이션의 IAM 사용자를 생성합니다. 애플리케이션은 애플리케이션 사용자에게만 읽기 액세스를 허용하는 권한이 있는 임시 디렉토리에서 IAM 사용자 자격 증명을 검색합니다.
C. S3 버킷에서 객체에 대한 목록 액세스를 허용하는 EC2에 대한 IAM 역할을 생성합니다. 역할이 있는 인스턴스를 시작하고 EC2 인스턴스 메타 데이터에서 역할 자격 증명을 검색합니다.
D. AWS 계정 액세스 키를 사용하십시오. 응용 프로그램은 응용 프로그램의 소스 코드에서 자격 증명을 검색합니다.
Answer: C
Explanation:
http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-metadata.html
