思科认证考试
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 rec
题目
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 received
- B、check to see if any packet received at a router interface arrives on the best return path
- C、combine with a configured ACL
- D、log its events，if you specify the logging options for the ACL entries used by the unicast rpf command
- E、inspect IP packets encapsulated in tunnels， such as GRE
相似问题和答案
第1题：
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
第2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3题：
A. ip sa-validate
B. ip split-horizon
C. ip access-routes
D. ip filter-options
第4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
第5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6题：
A.Reverse protocol forwarding
B.Reverse protocol flooding
C.Reverse path forwarding
D.Reverse path flooding
第7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8题：
A. reverse path of the RRO
B. least cost to the ingress router
C. shortest path to the egress router
D. reverse path of the path vector TLV
第9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10题：
How is an RSVP resv message sent back to the ingress router?（）
- A、reverse path of the RRO
- B、least cost to the ingress router
- C、shortest path to the egress router
- D、reverse path of the path vector TLV
正确答案:A