问答题what is RPF（ Reverse Path Forwarding ）？

考题 What is the term "ordered control" mean regarding how MPLS LSPs are established?() A. establish starting at the egress router going back to the ingress routerB. establish starting at the ingress router going downstream to the egress routerC. establish when a router learns of a new prefixD. establish when the path correctly matches the reverse path forwarding check

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考题 What is one of the uses of MBGP routes?() A. DVMRP hold-time periodB. Rendezvous point electionC. reverse path forwarding checksD. interdomain multicast next hops

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考题 What is the purpose of unicast reverse path forwarding?() A. to validate packet receipt on interfaces where the traffic should be receivedB. to forward packets out the interfaces where the traffic should be receivedC. to forward packets out the interfaces where the traffic should be sentD. to validate packet receipt on interfaces where the traffic should be sent

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考题组播转发技术中最为核心的技术就是RPF,下列关于RPF说法正确的有()。 A.RPF的全称为Reverse Path Forwarding;B.RPF的转发依据是报文的目的地址和单播路由表;C.PRF的转发依据是报文的源地址和单播路由表;D.RPF和具体的某种单播路由协议是无关的。

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考题 Refer to the exhibit. Which two conclusions can be drawn from the debug ip igmp output?() A. The router sent an IGMP version 2 query out interface Ethernet1 at multicast address 224.0.0.1.B. Router RTA received an IGMP report version 1 from host 192.168.9.1.C. Reverse Path Forwarding (RPF) is ena bled for 192.168.9.4.D. Reverse Path Forwarding (RPF) is enabled for 224.0.1.40.E. The IP multicast groups are 224.0.0.1, 224.0.1.40, and 239.255.0.1.F. IP PIM RP mapping is static.

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考题 Refer to the exhibit. IP multicast for group address 224.1.1.1 has been enabled on all router s in the network. Hosts on Network A receive the multicast traffic. However, hosts on Network B do not. On the basis of outputs provided, what could be the cause of the problem? （）A. The route to 224.69.15.0/24 will be out Ethernet 0B. The reverse path forwarding (RPF) for the route 224.2.0.1 failed to find the interface on which the multicast packet was rece ivedC. Multicast route to 224.69.15.0/24 was added to the mroute table and created by a source directly connected to the routerD. Multicast route to 10.16.0.0/16 was added to the mroute table and created by a source directly connected to the routerE. This router received an IGMP host report from a group member or a PIM join message

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考题下列关于RPF(Reverse Path Forwarding)的说法正确的是() A.RPF是广播数据采用的数据包转发方法B.RPF是组播数据包采用的数据转发方法C.RPF依据组播包源地址执行数据转发D.RPF依据组播包目的地址执行数据转发

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考题在组播网络中RPF代表什么?()。 A.Reverse protocol forwardingB.Reverse protocol floodingC.Reverse path forwardingD.Reverse path flooding

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考题 Which of the following is the most effective technique to prevent source IPAddress spoofing？（）A、 policy based routing （PBR）B、 unicast reverse path forwarding （uRPF）C、 lock and keyACLD、 RFC 1918filteringE、 IP source routing

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考题 Unicast Reverse Path Forwarding （Urpf ） can work in the following modes：（）A、Express modeB、Strict modeC、Loose modeD、Tunnel modeE、Safe mode

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考题 Which two statements are true about Unicast Reverse Path Forwarding Loose Mode？（）A、It is used in multihome network scenarios.B、It can be used with BGP to mitigate DoS and DDoS.C、It does not need to have CEF enabled.D、It is enabled via the interface level command ip verify unicast reverse-path.E、It cannot be used with "classification" access lists.

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考题 what is RPF（ Reverse Path Forwarding ）？

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考题 How is an RSVP resv message sent back to the ingress router?（）A、reverse path of the RROB、least cost to the ingress routerC、shortest path to the egress routerD、reverse path of the path vector TLV

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考题 The OSPF RFC 3623 Graceful Restart feature allows you to configure IETF NSF in ultivendor networks. When using OSPF Graceful Restart，which mechanism is used tocontinue forwarding packets during a switchover？（）A、Reverse Path ForwardingB、Hardware-based forwardingC、UDP forwardingD、Layer 2 Forwarding

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考题 Which of the following IOS features can prevent IP spoofing attacks？（）A、PPP over EthernetB、Cisco Express forwardingC、MPLS traffic EngineeringD、IS-IS routingE、Unicast Reverse Path Forwarding（uRPF）

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考题 Which IOS features are used to avoid Routing loops when dynamic Routing protocols are used betweenPE and CE in MPLS-VPN networks？（）A、Site Of Origin SOO.B、SHAM links with OSPFC、BGP cost communityD、BGP feature allow-as inE、RPF Reverse Path forwarding.F、Access-list Control in Distance Vector protocol like RIP and EIGRP.

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考题 Unicast Reverse Path Forwarding can perform all of these actions except which one？（）A、examine all packets received to make sure that the source addresses and source interfaces appear in the routing table and match the interfaces where the packets were receivedB、check to see if any packet received at a router interface arrives on the best return pathC、combine with a configured ACLD、log its events，if you specify the logging options for the ACL entries used by the unicast rpf commandE、inspect IP packets encapsulated in tunnels， such as GRE

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考题在组播网络中RPF代表什么？（）。A、Reverse protocol forwardingB、Reverse protocol floodingC、Reverse path forwardingD、Reverse path flooding

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考题 What is the purpose of unicast reverse path forwarding?（）A、to validate packet receipt on interfaces where the traffic should be receivedB、to forward packets out the interfaces where the traffic should be receivedC、to forward packets out the interfaces where the traffic should be sentD、to validate packet receipt on interfaces where the traffic should be sent

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考题 What is one of the uses of MBGP routes?（）A、DVMRP hold-time periodB、Rendezvous point electionC、reverse path forwarding checksD、interdomain multicast next hops

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考题单选题Which of the following is the most effective technique to prevent source IPAddress spoofing？（）A policy based routing （PBR）B unicast reverse path forwarding （uRPF）C lock and keyACLD RFC 1918filteringE IP source routing

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考题多选题Unicast Reverse Path Forwarding （Urpf ） can work in the following modes：（）AExpress modeBStrict modeCLoose modeDTunnel modeESafe mode

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考题单选题What is the term "ordered control" mean regarding how MPLS LSPs are established?（）A establish starting at the egress router going back to the ingress routerB establish starting at the ingress router going downstream to the egress routerC establish when a router learns of a new prefixD establish when the path correctly matches the reverse path forwarding check

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考题单选题Which configuration command allows the ERX Edge Router to perform Unicast Reverse Path Forwarding lookups on all packets received on an IP interface?（）A ip sa-validateB ip split-horizonC ip access-routesD ip filter-options

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考题多选题下列关于RPF（Reverse Path Forwarding）的说法正确的是（）ARPF是广播数据采用的数据包转发方法BRPF是组播数据包采用的数据转发方法CRPF依据组播包源地址执行数据转发DRPF依据组播包目的地址执行数据转发

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考题多选题Which two multicast protocol statements are true？（Choose two.）（）ADense mode multicast requires explicit join messages from their members.BDense mode multicast uses a push model to flood traffic throughout the network and then prunes the unwanted traffic.CSparse mode multicast uses a pull model to send multicast traffic to where it is requested.DSparse mode uses reverse path forwarding （RPF） to prune off redundant flows.EThe primary use of sparse mode multicast is for test labs and router performance testing.