Which mechanism can you use to achieve sub-second failover for link failure detection when a switched Ethernet media is used and loss of signal is not supported by the link provider？（） OSPF standard hellos。 Cisco Discovery Protocol link detection。 Bidirectional Forwarding Detection。 Fast Link Pulse。 autonegotiatio。
Which three statements about the Cisco MPLS TE Fast Reroute （FRR） process are true？（） TE tunnels that are configured with the FRR option cannot be used as backup tunnels.。 TE tunnels that are configured with the FRR option can be used as backup tunnels.。 The backup tunnel that is used to protect a physical interface must have a valid IP address configured.。 Interfaces must use MPLS global label allocation.。 The source IP address of use backup tunnel and the merge point （MP） should not be reachable.。
在市场经济条件下，报酬和风险是成反比的，即报酬越高，风险越小。（）
因为企业的价值与预期的报酬成正比，与预期的风险成反比，因此企业的价值只有在报酬最大风险最小时才能达到最大。（）
Which of the following is the most effective technique to prevent source IPAddress spoofing？（） policy based routing （PBR）。 unicast reverse path forwarding （uRPF）。 lock and keyACL。 RFC 1918filtering。 IP source routing。
根据CI策划埋论。学校形象是由一套识别系统组成的，包括：（）
