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.

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

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

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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