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多項(xiàng)選擇題Host 1 is trying to communicate with Host 2. The e0 interface on Router C is down. Which of the following are true (Choose two.)（）。

A.Router C will use ICMP to inform Host 1 that Host 2 cannot be reached
B.Router C will use ICMP to inform Router B that Host 2 cannot be reached
C.Router C will use ICMP to inform Host 1, Router A, and Router B that Host 2 cannot be reached
D.Router C will send a Destination Unreachable message type
E.Router C will send a Router Selection message type
F.Router C will send a Source Quench message type

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1.單項(xiàng)選擇題Which IPV6 routing protocol uses multicast group FF02::8 to send updates?（）

A.RIPng
B.OSPFv3
C.IS-IS for IPv6
D.static

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2.多項(xiàng)選擇題What information does a router running a link-state protocol use to build and maintain its topological database?（）

A.hello packets
B.SAP messages sent by other routers
C.LSAs from other routers
D.beacons received on point-to-point links
E.routing tables received from other link-state routers
F.TTL packets from designated routers

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3.多項(xiàng)選擇題OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? （）

A.Each OSPF area requires a loopback interface to be configured.
B.Areas may be assigned any number from 0 to 65535.
C.Area 0 is called the backbone area.
D.Hierarchical OSPF networks do not require multiple areas.
E.Multiple OSPF areas must connect to area 0.
F.Single area OSPF networks must be configured in area 1.

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4.多項(xiàng)選擇題Which are valid modes for a switch port used as a VLAN trunk? （）

A.transparent
B.auto
C.on
D.desirable
E.blocking
F.forwarding

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5.填空題流控的三種方式是（）、（）、（）。

參考答案：抑制技術(shù)；緩存技術(shù)；窗口機(jī)制