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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
更多 “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” 相关考题
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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 routers 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 routers 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
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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
考题
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 TTLB. Layer 3 TTLC. Layer 3 source addressD. Layer 3 transport protocolE. Layer 3 destination address
考题
Which roaming option will keep them on the same IP subnet when client traffic is being bridged through LAN interfaces on two WLCs?()
A. Layer 1intercontroller roamingB. Layer 2intercontroller roamingC. Layer 3intercontroller roamingD. Layer 4intercontroller roaming
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Traditional IP packet forwarding analyzes the（ ）IP address contained in the network layer header of each packet as the packet travels from its source to its final destination.A router analyzes the destination IP address independently at each hop in the network.Dynamic（ ）protocols or static configuration builds the database needed to analyze the destination IP address（the routing table）.The process of implementing traditional IP routing also is called hop-by-hop destination-based（ ）routing.Although successful，and obviously widely deployed，certain restrictions，which have been realized for some time，exist for this method of packet forwarding that diminish is（请作答此空）.New techniques are therefore required to address and expand the functionality of an IP-based network infrastructure.This first chapter concentrates on identifying these restrictions and presents a new archiecture，known as multiprotocol（ ）switching，that provides solutions some of these restrictions.
A.reliability
B.flexibility
C.stability
D.capability
考题
Which of these recommendations is most appropriate for the Cisco Campus Architecture?（）A、Utilize Layer 3 switching.B、Utilize software accelerated services.C、Aggregate end users and support a feature-rich environment.D、Perform packet manipulation and filtering at the core layer.E、Use redundant point-to-point Layer 2 interconnections when there is a link or node failure.
考题
Which of these recommendations is most appropriate for the core layer in the Cisco Campus Architecture？（）A、 Utilize Layer 3 switchingB、 Utilize software accelerated servicesC、 Aggregate end users and support a feature-rich environmentD、 Perform packet manipulation and filtering at the core layerE、 Use redundant point to-point Layer 2 interconnections when where is a link or node failure.
考题
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
考题
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.
考题
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 TTLB、Layer 3 TTLC、Layer 3 source addressD、Layer 3 destination address
考题
Which two options can be used as traffic descriptors when classifying and marking traffic？ （）A、incoming interfaceB、Layer 2 differentiated services code point （DSCP）C、Layer 3 IP precedenceD、outgoing interface
考题
Which roaming option will keep them on the same IP subnet when client traffic is being bridged through LAN interfaces on two WLCs?（）A、Layer 1intercontroller roamingB、Layer 2intercontroller roamingC、Layer 3intercontroller roamingD、Layer 4intercontroller roaming
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What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？（）A、codecB、link speedC、Layer 2 encapsulationD、packet overhead （IP/UDP/RTP）E、link delayF、total number of simultaneous calls that are allowed
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Which two statements about an interface configured with the asr-group command are correct?（）A、The FWSM supports up to 16 asymmetric routing groups.B、If a matching packet is not found, the packet is dropped.C、Asymetric routing of return traffic is enabled.D、If a matching packet is found, the Layer 3 header is rewritten.E、If a matching packet is found, the Layer 3 header is rewritten and the packet is forwarded to the default gateway.
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Overlay Transport Virtualization （OTV） overlay interface is a logical multiaccess and multicast- capable interface that must be explicitly defined by the user and where the entire OTV configuration is applied. Which statements are true about OTV overlay interface？（）A、 When an OTV edge device receives a Layer 2 frame destined for a remote data center site， the frame is logically forwarded to the overlay interface.B、 The OTV edge device performs the dynamic OTV encapsulation on the Layer 2 packet and sends it to the join interface toward the routed domain.C、 When the OTV edge device receives a Layer 2 frame destined for a remote data center site， the frame is logically forwarded to the join interface.D、 The OTV edge device performs the dynamic OTV encapsulation on the Layer 2 packet and sends it to the overlay interface toward the routed domain.
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What are the DSL-specific factors that require additional bandwidth when supporting Voice-over-IP over an IPSec VPN?（）A、A voice packet is sent via multiple fixed-length cells; a portion of the last cell is padding, requiring more bandwidth.B、ADSL typically uses PPPoE encapsulation, which adds additional overhead to each voice packet.C、A voice packet is sent via multiple fixed-length cells; each cell has about 10% Layer-2 header overhead. D、IPSec requires additional overhead for the header and hash. E、ADSL carrier band requires additional bits to be carried over the wire to the DSL Access Concentrator.
考题
Which roaming option will keep them on the same IP subnet when client traffic is being bridged through LAN interfaces on two WLCs？（）A、 Layer 1 intercontroller roamingB、 Layer 2 intercontroller roamingC、 Layer 3 intercontroller roamingD、 Layer 4 intercontroller roaming
考题
For IKE phase 1 negotiations， when is aggressive mode typically used？（）A、when one of the tunnel peers has a dynamic IP addressB、when one of the tunnel peers wants to force main mode to be usedC、when fragmentation of the IKE packet is required between the two peersD、when one of the tunnel peers wants to specify a different phase 1 proposal
考题
When an SRX series device receives an ESP packet, what happens?（）A、If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, it willB、If the destination IP address in the outer IP header of ESP does not match the IP address of the ingress interface, it willC、If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, based packet.D、If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, based of inner header, it will decrypt the packet.
考题
单选题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.
考题
单选题Which of these recommendations is most appropriate for the core layer in the Cisco Campus Architecture？（）A
Utilize Layer 3 switchingB
Utilize software accelerated servicesC
Aggregate end users and support a feature-rich environmentD
Perform packet manipulation and filtering at the core layerE
Use redundant point to-point Layer 2 interconnections when where is a link or node failure.
考题
多选题If an edge Label Switch Router （LSR） is properly configured，which three combinations are possible？（）AA received IP packet is forwarded based on the IP destination address and the packet is sent as an IP packet.BAn IP destination exists in the IP forwarding table. A received labeled packet is dropped because the label is not found in the LFIB table.CThere is an MPLS label-switched path toward the destination. A received IP packet is dropped because the destination is not found in the IP forwarding table.DA received IP packet is forwarded based on the IP destination address and the packet is sent as a labeled packet.EA received labeled IP packet is forwarded based upon both the label and the IP address.FA received labeled packet is forwarded based on the label. After the label is swapped，the newly labeled packet is sent.
考题
单选题When an SRX series device receives an ESP packet, what happens?（）A
If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, it willB
If the destination IP address in the outer IP header of ESP does not match the IP address of the ingress interface, it willC
If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, based packet.D
If the destination address of the outer IP header of the ESP packet matches the IP address of the ingress interface, based of inner header, it will decrypt the packet.
考题
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 TTLB
Layer 3 TTLC
Layer 3 source addressD
Layer 3 transport protocolE
Layer 3 destination address
考题
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
考题
单选题Which roaming option will keep them on the same IP subnet when client traffic is being bridged through LAN interfaces on two WLCs？（）A
Layer 1 intercontroller roamingB
Layer 2 intercontroller roamingC
Layer 3 intercontroller roamingD
Layer 4 intercontroller roaming
考题
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 TTLB
Layer 3 TTLC
Layer 3 source addressD
Layer 3 destination address
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