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【简答题】
生铁和钢是重要的金属材料，在生产、生活中有广泛的用途。 ⑴ 生铁和钢属于_________（填“纯净物”或“混合物”）； ⑵ 每年世界上钢铁的产量很高，钢铁的锈蚀也给人类带来了巨大的损失。空气中锈蚀，实际上是空气中的氧气和 共同作用的结果。防止家用铁锅生锈，最简易方法是____________________；人们还采用隔绝氧气的方法防止钢铁制品的锈蚀，具体方法有_________________（举一例）； ⑶ 工业上炼铁的主要反应过程如下（赤铁矿的主要成分为氧化铁）： 请写出第③步反应的化学方程式： ； ⑷ 用1000 t含氧化铁的质量分数为70%的赤铁矿石，理论上可炼出含铁98%的生铁_____________ t 。
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【单选题】关于 overlay 网络下列说法不正确的是( )
A.
Overlay 网络是一个建立在已有网络上的虚拟网络，逻辑节点和逻辑链路构成了 Overlay 网络
B.
可以解决 4K VLAN 上限的问题
C.
Overlay 边缘设备决定了数据报文的封装 / 解封装节点，决定了 Overlay 网络的规模
D.
Overlay 数据平面提供提供数据封装和隧道管理功能
【简答题】问：请问什么是overlay方式？
【简答题】overlay ______。
【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...
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.
【多选题】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...
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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