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? （）ALayer 2 TTLBLayer 3 TTLCLayer 3 source addressDLayer 3 transport protocolELayer 3 destination address
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
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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.
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
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
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
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 TTLB. Layer 3 TTLC. Layer 3 source addressD. Layer 3 transport protocolE. Layer 3 destination address
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
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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
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.
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 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 destination address
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 informationB、Data link layer adds physical source destination address an FCS to the segmentC、Packets are created when the network layer encapsulate a frame with source destination host address protocol related control informationD、Packets are created when the network layers adds layers 3 address control information to a segmentE、The presentation layer translated bits into bits into voltages for transmission across the physical link
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 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 transport protocolE、Layer 3 destination address
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 informationB、VPN traffic needs to be classified based on the IP precedence or DSCPC、VPN traffic needs to be classified based on IP flow or Layer 3 information， such as source and destination IP addressD、VPN traffic with Authentication Header （AH） needs to preserve the ToS byte
Which layer in the TCP/IP model is responsible for delivering packets to their destination?（）A、Application LayerB、Transport LayerC、Internet LayerD、Network Access Layer
What does a Layer 2 switch use to decide where to forward a received frame?（）A、source MAC addressB、source IP addressC、source switch portD、destination IP addressE、destination port addressF、destination MAC address
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.
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 payloadB、Inserted between the MPLS label stack and the Layer 3 HeaderC、Inserted between the MPLS label stack and the Layer 2 payloadD、Inserted between the MPLS label stack and the Layer 2 header
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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? （）ALayer 2 TTLBLayer 3 TTLCLayer 3 source addressDLayer 3 transport protocolELayer 3 destination address
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？（）AInserted between the MPLS label stack and the Layer 3 payloadBInserted between the MPLS label stack and the Layer 3 HeaderCInserted between the MPLS label stack and the Layer 2 payloadDInserted between the MPLS label stack and the Layer 2 header
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 nodeB The solicited node multicast address of the destination nodeC The Layer 2 address of the destination node based on the destination IPv6 addressD The IPv6 address of the destination node based on the destination Layer 2 address
单选题If the PFE does not have a route to the destination address of a packet, which action will be taken?（）AThe PFE floods the packet out of all interfaces.BThe PFE drops the packet and sends a destination unreachable notification back to source device.CThe PFE forwards the packet to the routing engine for furtherprocessing.DThe PFE queues the packet and sends are quest for a layer3 lookup to the routing engine.
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?（）ApresentationBsessionCtransportDnetworkEphysical
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?（）ALayer 2 TTLBLayer 3 TTLCLayer 3 source addressDLayer 3 destination address
多选题Which of the following correctly describe steps in the OSI data encapsulation process?（）ATransport layer divides a data stream into segments adds reliability flow control informationBData link layer adds physical source destination address an FCS to the segmentCPackets are created when the network layer encapsulate a frame with source destination host address protocol related control informationDPackets are created when the network layers adds layers 3 address control information to a segmentEThe presentation layer translated bits into bits into voltages for transmission across the physical link