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名词解释题
叠加overlay
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考题
In IPv6 network, an IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across the existing IPv4 infrastructurE. There are currently fiv e IPv6 overlay tunnel types. Which three IPv6 overlay tunnel statements are true？（）A、Overlay tunnels can only be configured between border routers capable of supporting IPv4 and IPv6.B、An manual overlay tunnel supports point - to - multipo int tunnels capable of carrying IPv6 and Connectionless Network Service (CLNS) packets.C、Overlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.D、Overlay tunnels can be configured between border route rs or between a border router and a host capable of supporting IPv4 and IPv6.E、Cisco IOS supports manual, generic routing encapsulation (GRE), IPv4 - compatible, 6to4, and Intra - Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechan isms.F、Cisco IOS supports manual, generic routing encapsulation (GRE), IPv6 - compatible, 4to6, and Multiprotocol Label Switching (MPLS) overlay tunneling mechanisms.
考题
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.
考题
Overlay Transport Virtualization （OTV） provides an overlay that enables Layer 2 connectivity between separate Layer 2 domains， while keeping these domains independent and preserving the fault isolation， resiliency， and load-balancing benefits of an IP-based interconnection. Which statements are true about OTV Adjacency Server？（）A、 Adjacency Server is required when OTV is deployed with unicast-only transport.B、 Adjacency Server is required when OTV is deployed with multicast-enabled transport.C、 Each OTV device wishing to join a specific OTV logical overlay needs to first register with the Adjacency Server.D、 Each OTV device trying to join a specific OTV logical overlay needs to be configured as an Adjacency Server.
考题
Which three of these items are IPv6 transition mechanisms? （）(Choose three.)A、ISATAPB、NATV6C、manually configured overlay tunnelsD、dual stack configurations
考题
单选题When using Overlay Transport Virtualization （OTV）， how do L2 multicast frames traverse the overlay？（）A
The L2 multicast frames are encapsulated in an OTV packet using the configured control-group multicast address for transportB
The L2 multicast frames are dropped because multicast cannot be carried across the overlay C
The L2 multicast frames are encapsulated in an OTV packet using the configured data-group multicast address for transportD
The L2 multicast frames are forwarded natively across the overlay based on their multicast IDs
考题
多选题In IPv6 network, an IPv6 overlay tunnel is required to communicate with isolated IPv6 networks across the existing IPv4 infrastructurE. There are currently fiv e IPv6 overlay tunnel types. Which three IPv6 overlay tunnel statements are true？（）AOverlay tunnels can only be configured between border routers capable of supporting IPv4 and IPv6.BAn manual overlay tunnel supports point - to - multipo int tunnels capable of carrying IPv6 and Connectionless Network Service (CLNS) packets.COverlay tunneling encapsulates IPv6 packets in IPv4 packets for delivery across an IPv4 infrastructure.DOverlay tunnels can be configured between border route rs or between a border router and a host capable of supporting IPv4 and IPv6.ECisco IOS supports manual, generic routing encapsulation (GRE), IPv4 - compatible, 6to4, and Intra - Site Automatic Tunnel Addressing Protocol (ISATAP) overlay tunneling mechan isms.FCisco IOS supports manual, generic routing encapsulation (GRE), IPv6 - compatible, 4to6, and Multiprotocol Label Switching (MPLS) overlay tunneling mechanisms.
考题
单选题非电气化区段正线采用（）发码方式，股道采用（）发码方式。A
叠加；叠加B
叠加；预叠加C
预叠加；叠加D
预叠加；预叠加
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