Which of the following two statements about Cisco NSF and SSO are the most relevant to thenetwork designer？ （）
A. You can reduce outage 1 to 3 seconds by using SSO in Layer 2 environment or Cisco NSF withSSO in a Layer 3 environment.
B. SSO and NSF each require the device to either be graceful restart-capable or graceful-aware.
C. In a fully redundant topology adding redundant supervisor a with NSF and SSO may causelonger convergence times than single supervisors with turned IGP times
D. The primary deployment scenario for Cisco NSF with SSO is in the Distribution and Corelayers.
E. Cisco NSF-aware neighbor relationship are independent of any turned IGP times
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以下为全文数据库的是（）。
A. proquest
B. cnki
C. 万方
D. 维普
E. pubmed
Refer to the exhibit. Which of the following is an advantage of device clustering utilizing Virtual Port Channels （vPC）？（）
A logical star topology provides a loop free environment so that all links will be used forwardtraffic
B. Enhanced EtherChannel hashing load balancing using the vPC peer link internal to the VPC
C. The control plane functions of the Nexus switches are merged to hide the use of virtualization
D. Neighboring devices connect on a Layer 3 MEC for improved packet forwarding
请参见图示。根据 ping 命令的输出可得出哪两条结论（）
A. 出现了目的地不可达错误
B. 数据包类型未知
C. 一个数据包超时
D. ping中断
E. 成功收到四个数据包
F. 超过了数据包的TTL值
请参见图示。四台主机被添加到172.16.112.0网络中。作为此网络的主机地址，下列哪个IP地址无效？（）
A. 172.16.113.55
B. 172.16.112.255
C. 172.16.127.255
D. 172.16.112.89
E. 172.16.120.96
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