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
单选题
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

相似考题

1.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

2.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.

3.When policy － based routing (PBR) is being configured, which three criteria can the set command specify?()A. all interfaces in the path toward the destinationB. all networks in the path toward the destinationC. adjacent next hop router in the path toward the destinationD. all routers in the path toward the destinationE. all interfaces through which the packets can be routedF. type of service and precedence in the IP packets

4.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

更多“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 ”相关问题

  • 第1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


    参考答案：B

  • 第2题：

    If the router R1 has a packet with a destination address 192.168.1.255, what describes the operation of the network()。

    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.


    参考答案：B

  • 第3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4题：

    To ensure voice packets are kept within the Committed Information Rate （CIR） of a Frame Relaylink， what should be used in the CPE？（）

    • A、 prioritization
    • B、 classification
    • C、 fragmentation
    • D、 traffic shaping

    正确答案:D

  • 第5题：

    Which two statements are true about Voice over IP （VoIP） packet delivery in a digital infrastructure？ （）

    • A、 Packets can arrive out of order.
    • B、 Packets must take the same path to the destination.
    • C、 Once packets are received at the destination router， the router performs sampling to ensure the quality of the voice traffic.
    • D、 Packets can experience varying delays across the network.
    • E、 Packets containing voice samples are sequentially numbered by default， allowing for reordering upon arrival at the terminal router along the path.

    正确答案:A,D

  • 第6题：

    Which two statements about forwarding equivalence class （FEC） are true？（）

    • A、FEC might correspond to a destination IP subnet， but it might also correspond to any traffic class that the edge LSR considers significant.
    • B、FEC is a group of IP packets that is forwarded over a different path， but with the same forwarding treatment.
    • C、FEC is a group of IP packets that is forwarded over the same path， and with the same forwarding treatment.
    • D、FEC is a group of IP packets that is forwarded over a different path， but with the different forwarding treatment.
    • E、FEC is a group of IP packets that is forwarded over the same path， but with a different forwarding treatment

    正确答案:A,C

  • 第7题：

    Which three statements are true of the Link Aggregation Control Protocol （LACP）？（）

    • A、LACP is used to connect to non-Cisco devices.
    • B、LACP packets are sent with the command channel-group 1 mode desirable.
    • C、LACP packets are sent with the command channel-group 1 mode active.
    • D、Standby interfaces should be configured with a higher priority.
    • E、Standby interfaces should be configured with a lower priority.

    正确答案:A,C,D

  • 第8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

    正确答案:A

  • 第9题：

    多选题
    You are the network consultant from Cisco.com. Please point out two statements correctly describe an IPS device？（）
    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.


    正确答案： C,A
    解析： 暂无解析

  • 第10题：

    单选题
    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： E
    解析： 暂无解析

  • 第11题：

    单选题
    If the router R1 has a packet with a destination address 192.168.1.255, what describes the operation of the network（）。
    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.


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    The ip pim autorp listener command is used to do which of these？（）
    A

    enable a Cisco router to passively listen to Auto-RP packets without the router actively sending or forwarding any of the packets

    B

    allow Auto-RP packets in groups 224.0.1.39 and 224.0.1.40 to be flooded in dense mode out interfaces configured with the ip pim sparse-mode command

    C

    enable the use of Auto-RP on a router

    D

    configure the router as an Auto-RP mapping agent


    正确答案： C
    解析： 暂无解析

  • 第13题：

    You are the network consultant from Cisco.com. Please point out two statements correctly describe an IPS device()

    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.


    参考答案：A, C

  • 第14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15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

  • 第16题：

    When policy - based routing (PBR) is being configured, which three criteria can the set command specify?（）

    • 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

    正确答案:C,E,F

  • 第17题：

    The ip pim autorp listener command is used to do which of these？（）

    • A、enable a Cisco router to "passively" listen to Auto-RP packets without the router actively sending or forwarding any of the packets
    • B、allow Auto-RP packets in groups 224.0.1.39 and 224.0.1.40 to be flooded in dense mode out interfaces configured with the ip pim sparse-mode command
    • C、enable the use of Auto-RP on a router
    • D、configure the router as an Auto-RP mapping agent

    正确答案:B

  • 第18题：

    What Cisco IOS feature examines packets received to make sure that the source address and interfaceare in the routing table and matck the interface that the packet was received on？（）

    • A、MPLS Traffic Engineering
    • B、Dynamic access-lists
    • C、Authentication
    • D、Receive ACL
    • E、Unicast RPF

    正确答案:E

  • 第19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 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

    正确答案:E

  • 第20题：

    What are two purposes of a forwarding class?（）

    • A、to identify traffic that should be dropped
    • B、to classify traffic
    • C、to identify traffic that should receive common treatment
    • D、to assign traffic to output queues

    正确答案:C,D

  • 第21题：

    多选题
    When policy - based routing (PBR) is being configured, which three criteria can the set command specify?（）
    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


    正确答案： C,F
    解析： 暂无解析

  • 第22题：

    单选题
    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 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


    正确答案： B
    解析： 暂无解析

  • 第23题：

    单选题
    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： E
    解析： 暂无解析

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