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多項(xiàng)選擇題For what two purposes does the Ethernet protocol use physical addresses？（）

A.to uniquely identify devices at Layer 2
B.to allow communication with devices on a different network
C.to differentiate a Layer 2 frame from a Layer 3 packet
D.to establish a priority system to determine which device gets to transmit first
E.to allow communication between different devices on the same network
F.to allow detection of a remote device when its physical address is unknown

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1.多項(xiàng)選擇題What are three characteristics of the OSPF routing protocol？（）

A. It converges quickly.
B. OSPF is a classful routing protocol.
C. It uses cost to determine the best route.
D. It uses the DUAL algorithm to determine the best route.
E. OSPF routers send the complete routing table to all directly attached routers.
F. OSPF routers discover neighbors before exchanging routing information.

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2.單項(xiàng)選擇題Which device might be installed at a branch office to enable and manage an IPsec site-to-site VPN？（）

A.Cisco IOS IPsec/SSL VPN client
B.Cisco VPN Clinet
C.ISDN terminal adapter
D.Cisco Adaptive Security Appliance

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3.單項(xiàng)選擇題what is the cause of this problem?（）

A.The OSPF area is not configured properly.
B.The priority on R1 should be set higher.
C.The cost on R1 should be set higher.
D.The hello and dead timers are not configured properly.
E.A backup designated router needs to be added to the network.
F.The OSPF process ID numbers must match.

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4.單項(xiàng)選擇題At which layer of the OSI model is RSTP used to prevent loops？（）

A.data link
B.network
C.physical
D.transport

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5.單項(xiàng)選擇題While troubleshooting a connectivity issue from a PC you obtain the following information:Local PC IP address: 10.0.0.35/24Default Gateway: 10.0.0.1Remote Sever: 10.5.75.250/24You then conduct the following tests from the local PC:Ping 127.0.0.1 – SuccessfulPing 10.0.0.35 – SuccessfulPing 10.0.0.1 – UnsuccessfulPing 10.5.75.250 – UnsuccessfulWhat is the underlying cause of this problem?（）

A.A remote physical layer problem exists.
B.The host NIC is not functioning.
C.TCP/IP has not been correctly installed on the host.
D.A local physical layer problem exists.

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