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。（）
抽样调查
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。
Nexus# conf t Enter configuration commands， one per line. End with CNTL/Z. Nexus（config）# interface Loopback10 % Permission denied Nexus（config）# ？ no Negate a command or set its defaults username Configure user information. end Go to exec mode exit Exit from command interpreter What is the reason why this user is not able to enter configuration commands？（） The user did not enter enable prior to going into configuration mode.。 The software license installed on Nexus is Layer 2 only， which does not allow the creation of Layer 3 interfaces.。 The user RBAC role is set to network-operator.。 The user failed authentication and user access defaulted to read-only mode.。 The AAA server is currently not responding.。
在主信道上进行测试时，一般需要对哪些指标进行测试（）
