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

题目
多选题
Unicast Reverse Path Forwarding （Urpf ） can work in the following modes：（）
A

Express mode

B

Strict mode

C

Loose mode

D

Tunnel mode

E

Safe mode

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相似问题和答案

第1题：

What is the purpose of unicast reverse path forwarding?()

A. to validate packet receipt on interfaces where the traffic should be received

B. to forward packets out the interfaces where the traffic should be received

C. to forward packets out the interfaces where the traffic should be sent

D. to validate packet receipt on interfaces where the traffic should be sent


参考答案：A

第2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 keyACL
  • D、 RFC 1918filtering
  • E、 IP source routing

正确答案:B

第3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-validate

B. ip split-horizon

C. ip access-routes

D. ip filter-options


参考答案：A

第4题：

what is RPF（ Reverse Path Forwarding ）？


正确答案:Forwarding multicast traffic away from the source， rather than to the receiver， is called Reverse Path Forwarding （RPF）. This RPF check helps to guarantee that the distribution tree will be loop-free.

第5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.

正确答案:A,B

第6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.


参考答案：A, B

第7题：

Unicast Reverse Path Forwarding （Urpf ） can work in the following modes：（）

  • A、Express mode
  • B、Strict mode
  • C、Loose mode
  • D、Tunnel mode
  • E、Safe mode

正确答案:B,C

第8题：

What is one of the uses of MBGP routes?()

A. DVMRP hold-time period

B. Rendezvous point election

C. reverse path forwarding checks

D. interdomain multicast next hops


参考答案：C

第9题：

Which of these statements accurately identifies how Unicast Reverse Path Forwarding can be employed to prevent the use of malformed or forged IP sources addresses？（）

  • A、It is applied only on the input interface of a router.
  • B、It is applied only on the output interface of a router.
  • C、It can be configured either on the input or output interface of a router.
  • D、It cannot be configured on a router interface.
  • E、It is configured under any routing protocol process.

正确答案:A

第10题：

What is true about Unicast RPF in strict mode？（）

  • A、It works well with a multihomed environment.
  • B、It will inspect IP packets that are encapsulated in tunnels， such as GRE，LT2P，or PPTP.
  • C、uRPF is performed within the CEF switching path.
  • D、There might be a problem with DHCP as Unicast RPF is blocking packets with a 0.0.0.0 sourceaddress.

正确答案:C

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