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多項選擇題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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1.多項選擇題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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2.多項選擇題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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3.填空題流控的三種方式是（）、（）、（）。

參考答案：抑制技術；緩存技術；窗口機制

4.多項選擇題Which two values are used by Spanning Tree Protocol to elect a root bridge (Choose two.)（）。

A.amount of RAM
B.bridge priority
C.IOS version
D.IP address
E.MAC address
F.speed of the links

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5.單項選擇題Which component of VPN technology ensures that data can be read only by its intended recipient?（）

A.dataintegrity
B.encryption
C.keyexchange
D.authentication

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