单选题When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）A Layer 2 TTLB Layer 3 TTLC Layer 3 source addressD Layer 3 transport protocolE Layer 3 destination address

题目
单选题
When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）
A

Layer 2 TTL

B

Layer 3 TTL

C

Layer 3 source address

D

Layer 3 transport protocol

E

Layer 3 destination address

相似考题

1.Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)A. The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.B. The DHCP Discover message uses UDP as the transport layer protocol.C. The DHCP Discover message uses a special Layer 2 multicast address as the destination address.D. The DHCP Discover message uses TCP as the transport layer protocol.E. The DHCP Discover message does not use a Layer 2 destination address.F. The DHCP Discover message does not require a transport layer protocol.

2.Together with the network layer,the transport layer is the heart of the protocol（ ）The network layer provides end-to-end（ ） delivery using datagrams or virtual circuits.The transport layer builds on the network layer to provide data transport from a process on a（ ）machine to a process on a destination machine with a desired level of reliability that is independent of the physical （ ） currently in use.It provides the abstractions that applications nedd to use the network..Without the（ ） layer,the whole concept of layered protocols would make little sense.A.transport B.network C.hierarchy D.service A.packet B.data C.command D.record A.connection B.terminal C.source D.destination A.traffic B.connection C.lines D.networks A.network B.transport C.link D.physical

3.Routers perform the decision process that selects what path a packet takes. These （ ） layer devices participate it the collection and distribution of network-layer information, and perform Layer 3 switching based on the contents of the network layer （ ） of each packet. You can connect the routers directly by point-to-point （ ） or local-area networks, or you can connect them by LAN or WAN switches. These Layer 2 switches unfortunately do not have the capability to hold Layer 3 （ ） information or to select the path taken by a packet through analysis of its Layer 3 destination address. Thus, Layer 2 switches be involved in the Layer 3 packet （ ） decision process.A.application B. network C.physical D.link A.header B.connection C.protocol D.data A.medium B.links C.switches D.carriers A.network B.links C.protocol D.routing A.switching B.processing C.forwarding D.connecting

4.TCP functions at the Open Systems Interconnection(OSI)transport layer, or Layer 4. Its chief responsibility is to ensure reliable end-to-end connectivity. IP, located one layer （1）, at the OSI network layer, or Layer 3,communicates the addresses of each packet’s sender and receiver to the routers along the way .Routers and Layer 3 switches can read IP and other Layer 3 protocols. This information, combined with routing tables and other network intelligence, it takes to get across the room or around the world（2）TCP/IP.The routing process begins with an IP address that is（3）to the sending end station. End stations may be assigned permanent IP addresses or they may borrow them as needed from a Dynamic Host Configuration Protocol(DHCP)server or other service. If the sending end station determines that the destination address is not local, the packet goes to a first-hop router, typically one that is close and has been reassigned to the（4）. The router inspects the packet’s IP address and performs a route table lookup to see if the destination end station resides on the local(physically connected)network, typically called an IP subnet. An IP subnet usually is assigned to each of the router’s network interfaces. If the destination IP address is local, the router searches an internal store of IP addresses and local-device media access control(MAC)addresses. This store is known as the Address Resolution Protocol(ARP) cache. ARP is the universal tool for（5）IP addresses to MAC addresses. If the destination’s MAC address appears, the router installs that MAC address in the packet header(removing its own MAC address because that’s no longer needed)and sends the packet to the destination end station.（1）A. upB. downC. sidewardD. back-fence（2）A. viaB. throughC. byD. through out（3）A. specialB. especialC. uniqueD. particular（4）A. accepterB. senderC. routerD. server（5）A. searchingB. lookingC. locatingD. matching

更多“单选题When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）A Layer 2 TTLB Layer 3 TTLC Layer 3 source addressD Layer 3 transport protocolE Layer 3 destination address”相关问题

  • 第1题：

    When an IP packet is Layer 3－switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? ()

    A. Layer 2 TTL

    B. Layer 3 TTL

    C. Layer 3 source address

    D. Layer 3 transport protocol

    E. Layer 3 destination address


    参考答案：B

  • 第2题：

    Which of the following correctly describe steps in the OSI data encapsulation process?()

    A. Transport layer divides a data stream into segments & adds reliability & flow control information

    B. Data link layer adds physical source & destination address & an FCS to the segment

    C. Packets are created when the network layer encapsulate a frame with source & destination host address& protocol related control information

    D. Packets are created when the network layers adds layers 3 address & control information to a segment

    E. The presentation layer translated bits into bits into voltages for transmission across the physical link


    参考答案：A, D

  • 第3题：

    When an IP packet is Layer 3-switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? （）

    • A、Layer 2 TTL
    • B、Layer 3 TTL
    • C、Layer 3 source address
    • D、Layer 3 transport protocol
    • E、Layer 3 destination address

    正确答案:B

  • 第4题：

    Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）

    • A、Layer 2 TTL
    • B、Layer 3 TTL
    • C、Layer 3 source address
    • D、Layer 3 destination address

    正确答案:B

  • 第5题：

    When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）

    • A、Layer 2 TTL
    • B、Layer 3 TTL
    • C、Layer 3 source address
    • D、Layer 3 transport protocol
    • E、Layer 3 destination address

    正确答案:B

  • 第6题：

    Which layer in the TCP/IP model is responsible for delivering packets to their destination?（）

    • A、Application Layer
    • B、Transport Layer
    • C、Internet Layer
    • D、Network Access Layer

    正确答案:C

  • 第7题：

    Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true?（）

    • A、The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.
    • B、The DHCP Discover message uses UDP as the transport layer protocol.
    • C、The DHCP Discover message uses a special Layer 2 multicast address as the destination address.
    • D、The DHCP Discover message uses TCP as the transport layer protocol.
    • E、The DHCP Discover message does not use a Layer 2 destination address.
    • F、The DHCP Discover message does not require a transport layer protocol.

    正确答案:A,B

  • 第8题：

    During the IPv6 address resolution， a node sends a neighbor solicitation message in order to discover which of these？（）

    • A、The Layer 2 multicast address of the destination node
    • B、The solicited node multicast address of the destination node
    • C、The Layer 2 address of the destination node based on the destination IPv6 address
    • D、The IPv6 address of the destination node based on the destination Layer 2 address

    正确答案:C

  • 第9题：

    单选题
    When an IP packet is Layer 3-switched from a source in one VLAN to a destination in another VLAN,which field in a packet will be rewritten? （）
    A

    Layer 2 TTL

    B

    Layer 3 TTL

    C

    Layer 3 source address

    D

    Layer 3 transport protocol

    E

    Layer 3 destination address


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    During the IPv6 address resolution， a node sends a neighbor solicitation message in order to discover which of these？ （）
    A

     The Layer 2 multicast address of the destination node

    B

     The solicited node multicast address of the destination node

    C

     The Layer 2 address of the destination node based on the destination IPv6 address

    D

     The IPv6 address of the destination node based on the destination Layer 2 address


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    Data transfer is slow between the source and destination. The quality of service requested by the transport layer in the OSI reference model is not being maintained. To fix this issue, at which layer should the troubleshooting process begin?（）
    A

    presentation

    B

    session

    C

    transport

    D

    network

    E

    physical


    正确答案： C
    解析： 暂无解析

  • 第12题：

    多选题
    Which of the following correctly describe steps in the OSI data encapsulation process?（）
    A

    Transport layer divides a data stream into segments & adds reliability & flow control information

    B

    Data link layer adds physical source & destination address & an FCS to the segment

    C

    Packets are created when the network layer encapsulate a frame with source & destination host address& protocol related control information

    D

    Packets are created when the network layers adds layers 3 address & control information to a segment

    E

    The presentation layer translated bits into bits into voltages for transmission across the physical link


    正确答案： C,D
    解析： 暂无解析

  • 第13题：

    When an IP packet is Layer 3－switched from a source in one VLAN to a destination in anotherVLAN, which field in a packet will be rewritten? ()

    A. Layer 2 TTL

    B. Layer 3 TTL

    C. Layer 3 source address

    D. Layer 3 transport protocol

    E. Layer 3 destination address


    参考答案：B

  • 第14题：

    Which of the following correctly describe steps in the OSI data encapsulation process?（）

    • A、The transport layer divides a data stream into segments and may add reliability and flow control information.
    • B、The data link layer adds physical source and destination addresses and an FCS to the segment.
    • C、Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.
    • D、Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
    • E、The presentation layer translates bits into voltages for transmission across the physical link.

    正确答案:A,D

  • 第15题：

    How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）

    • A、It will fragment the packet at Layer 2.
    • B、It will fragment the packet at Layer 3.
    • C、It will drop the packet and send an ICMPv6 message "packet too big" back to the source.
    • D、It will drop the packet.

    正确答案:C

  • 第16题：

    Which of the following correctly describe steps in the OSI data encapsulation process?（）

    • A、Transport layer divides a data stream into segments & adds reliability & flow control information
    • B、Data link layer adds physical source & destination address & an FCS to the segment
    • C、Packets are created when the network layer encapsulate a frame with source & destination host address& protocol related control information
    • D、Packets are created when the network layers adds layers 3 address & control information to a segment
    • E、The presentation layer translated bits into bits into voltages for transmission across the physical link

    正确答案:A,D

  • 第17题：

    Which QoS preclassification option will require the use of the qos pre-classify command for the VPN traffic？ （）

    • A、VPN traffic needs to be classified based on the Layer2 header information
    • B、VPN traffic needs to be classified based on the IP precedence or DSCP
    • C、VPN traffic needs to be classified based on IP flow or Layer 3 information， such as source and destination IP address
    • D、VPN traffic with Authentication Header （AH） needs to preserve the ToS byte

    正确答案:C

  • 第18题：

    What does a Layer 2 switch use to decide where to forward a received frame?（）

    • A、source MAC address
    • B、source IP address
    • C、source switch port
    • D、destination IP address
    • E、destination port address
    • F、destination MAC address

    正确答案:F

  • 第19题：

    In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）

    • A、Inserted between the MPLS label stack and the Layer 3 payload
    • B、Inserted between the MPLS label stack and the Layer 3 Header
    • C、Inserted between the MPLS label stack and the Layer 2 payload
    • D、Inserted between the MPLS label stack and the Layer 2 header

    正确答案:C

  • 第20题：

    If the PFE does not have a route to the destination address of a packet, which action will be taken?（）

    • A、The PFE floods the packet out of all interfaces.
    • B、The PFE drops the packet and sends a destination unreachable notification back to source device.
    • C、The PFE forwards the packet to the routing engine for furtherprocessing.
    • D、The PFE queues the packet and sends are quest for a layer3 lookup to the routing engine.

    正确答案:B

  • 第21题：

    单选题
    In Any Transport over MPLS （AtoM） Control word is an optional 4-byte field used in the pseudowire packet.The control word carries generic and Layer 2 payload-specific information to emulate L2 packets correctly.In pseudowire packet， where is this Control Word inserted？（）
    A

    Inserted between the MPLS label stack and the Layer 3 payload

    B

    Inserted between the MPLS label stack and the Layer 3 Header

    C

    Inserted between the MPLS label stack and the Layer 2 payload

    D

    Inserted between the MPLS label stack and the Layer 2 header


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    If the PFE does not have a route to the destination address of a packet, which action will be taken?（）
    A

    The PFE floods the packet out of all interfaces.

    B

    The PFE drops the packet and sends a destination unreachable notification back to source device.

    C

    The PFE forwards the packet to the routing engine for furtherprocessing.

    D

    The PFE queues the packet and sends are quest for a layer3 lookup to the routing engine.


    正确答案： A
    解析： 暂无解析

  • 第23题：

    单选题
    Assuming that an IP packet is sent from a source address in VLAN1 to a destination address in VLAN2 through a layer-3 switch, which part of the packet will be changed?（）
    A

    Layer 2 TTL

    B

    Layer 3 TTL

    C

    Layer 3 source address

    D

    Layer 3 destination address


    正确答案： A
    解析： 暂无解析

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