JN0-102
单选题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
题目
to validate packet receipt on interfaces where the traffic should be received
to forward packets out the interfaces where the traffic should be received
to forward packets out the interfaces where the traffic should be sent
to validate packet receipt on interfaces where the traffic should be sent
相似问题和答案
第1题：
The router SIS-R has been configured in a CIS network. As a network administrator, you were required to enable MPLS on that router.Which of the following description is making sense on the basis of the output information?（）
A. CEF switching is only needed to forward labeled packets.
B. CEF switching is needed on both ingress and egress interfaces on which MPLS is enabled.
C. Interface-level CEF switching is needed only on egress interfaces that are sending IP packets on which the egress LSR performs the label imposition process.
D. Interface-level CEF switching is needed only on ingress interfaces that are receiving IP packets on which the ingress LSR performs the label imposition process.
第2题：
A. IGMP
B. IGMP snooping
C. PIM - DM
D. DVMRP
E. MOS PF
第3题：
阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the router’s network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the router’s routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.
A．is generating B．generate C．is generated D．generates A．forwarding table B．network interfaces C．routing policies D．destination address A．the destination address and network interfaces B．forwarding table and network interfaces C．the destination address and forward table D．routing policies and routing table
第4题：
Which two statements describe traffic policing？（）
- A、Traffic bursts are smoothed out by queuing the excess traffic to produce a steadier flow of data
- B、Excess traffic is buffered so that the traffic remains within the desired rate.
- C、Packets that conform to traffic policies are not delayed.
- D、Packet marking is available and allows excess packets to be re-marked with a lower priorit
正确答案:C,D
第5题：
A.R1 will forward the packet out all interfaces.
B.R1 will drop this packet because this it is not a valid IP address.
C.As R1 forwards the frame containing this packet, Sw-A will add 192.168.1.255 to its MAC table.
D.R1 will encapsulate the packet in a frame with a destination MAC address of FF-FF-FF-FF-FF-FF
E.As R1 forwards the frame containing this packet, Sw-A will forward it to the device assigned the IP address of 192.168.1.255.
第6题：
A. all interfaces in the path toward the destination
B. all networks in the path toward the destination
C. adjacent next hop router in the path toward the destination
D. all routers in the path toward the destination
E. all interfaces through which the packets can be routed
F. type of service and precedence in the IP packets
第7题：
A. It resembles a Layer 2 bridge.
B. Traffic flow through the IPS resembles traffic flow through a Layer 3 router.
C. Inline interfaces which have no IP addresses cannot be detected.
D. Malicious packets that have been detected are allowed to pass through, but all subsequent traffic is blocked.
第8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9题：
Which tech nology manages multicast traffic at Layer 2 by configuring Layer 2 LAN interfaces dynamically to forward multicast traffic only to those interfaces that want to receive it?（）
- A、IGMP
- B、IGMP snooping
- C、PIM - DM
- D、DVMRP
- E、MOS PF
正确答案:B
第10题：
On Cisco Nexus 5000 Series Switches， where are the virtual output queues implemented， and what is the main purpose of virtual output queues？（）
- A、 on all ingress interfaces； to ensure maximum throughput on a per-egress， per-CoS basis
- B、 on all ingress interfaces； to provide independent congestion management and 16 queues
- C、 on all egress interfaces； so that a congested egress port does not affect traffic directed to other egress ports
- D、 on all egress interfaces； to prevent head-of-line blocking by utilizing multiple virtual output queues
- E、 on all egress interfaces； to be able to use EEE 802.1p CoS
正确答案:A