Which two mechanisms are available to secure NTP、 (Choose two.)哪两种机制可用于保护 NTP？ （选择两项。）

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• 1Which technology provides a secure communication channel for all traffic at Layer 2 of the OSI model、哪种技术为 OSI 模型第 2 层的所有流量提供安全通信通道？

  A.SSL

  B.Cisco TrustSec

  C.MACsec

  D.IPsec

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• 2Which two methods are used by an AP that is trying to discover a wireless LAN controller、 (Choose two.)尝试发现无线 LAN 控制器的 AP 使用哪两种方法？ （选择两项。）

  A.Cisco Discovery Protocol neighbor

  B.querying other APs

  C.DHCP Option 43

  D.broadcasting on the local subnet

  E.DNS lookup CISCO-DNA-PRIMARY.localdomain

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• 3Which IP SLA operation requires the IP SLA responder to be configured on the remote end、哪个IP SLA操作需要在远端配置IP SLA响应器？

  A.UDP jitter

  B.ICMP jitter

  C.TCP connect

  D.ICMP echo

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• 4Which statement explains why Type 1 hypervisor is considered more efficient than Type2 hypervisor、哪个陈述解释了为什么类型 1 管理程序被认为比类型 2 管理程序更有效？

  A.Type 1 hypervisor is the only type of hypervisor that supports hardware acceleration techniques.

  B.Type 1 hypervisor relies on the existing OS of the host machine to access CPU, memory, storage, and network resources.

  C.Type 1 hypervisor runs directly on the physical hardware of the host machine without relying on the underlying OS.

  D.Type 1 hypervisor enables other operating systems to run on it.

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• 5A client with IP address 209.165.201.25 must access a web server on port 80 at 209.165.200.225. To allow this traffic, an engineer must add a statement to anaccess control list that is applied in the inbound direction on the port connecting to the web servers.Which statement allows this traffic、IP 地址为 209.165.201.25 的客户端必须访问端口 80 上的 Web 服务器，地址为 209.165.200.225。 要允许此流量，工程师必须向在连接到 Web 服务器的端口上的入站方向应用的访问控制列表中添加一条语句。哪个语句允许此流量？

  A.permit tcp host 209.165.200.225 lt 80 host 209.165.201.25

  B.permit tcp host 209.165.201.25 host 209.165.200.225 eq 80

  C.permit tcp host 209.165.200.225 eq 80 host 209.165.201.25

  D.permit tcp host 209.165.200.225 host 209.165.201.25 eq 80

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• 6Which QoS component alters a packet to change the way that traffic is treated in the network、哪个 QoS 组件会更改数据包以更改网络中处理流量的方式？

  A.policing

  B.classification

  C.marking

  D.shaping

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• 7If a VRRP master router fails, which router is selected as the new master router、如果 VRRP 主路由器出现故障，选择哪个路由器作为新的主路由器？

  A.router with the lowest priority

  B.router with the highest priority

  C.router with the highest loopback address

  D.router with the lowest loopback address

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• 8Which PAgP mode combination prevents an EtherChannel from forming、哪种 PAgP 模式组合会阻止形成 EtherChannel？

  A.auto/desirable

  B.desirable/desirable

  C.desirable/auto

  D.auto/auto

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• 9Refer to this output.R1# *Feb 14 37:09:53.129: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet0/1, changed state to upWhat is the logging severity level、请参阅此输出。R1# *Feb 14 37:09:53.129: %LINEPROTO-5-UPDOWN：接口 GigabitEthernet0/1 上的线路协议，将状态更改为日志严重性级别是什么？

  A.notification

  B.emergency

  C.critical

  D.alert

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• 10Which protocol does REST API rely on to secure the communication channel、REST API 依赖哪种协议来保护通信通道？

  A.HTTP

  B.SSH

  C.HTTPS

  D.TCP

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