單項選擇題Where does routing occur within the DoD TCP/IP reference model?（）

A.application
B.internet
C.network
D.transport


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1.多項選擇題Which three statements accurately describe layer 2 Ethernet switches?（）

A.Microsegmentation decreases the number of collisions on the network.
B.if a switch receives a frame for an unkown destination,it uses ARP to resolve the address.
C.Spanning Tree Protocol allows switches to automatically share vlan information.
D.In a properly functioning network with redundant switched paths,each switched aegment will contain one root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have only one root port.
E.Establishing vlans increases the number of broadcast domains.
F.Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information.

2.多項選擇題

Refer to the exhibit.What two results would occur if the hub were to be replaced with a switch that is configured with one Ethernet VLAN?（）

A.The number of collision domains would decrease.
B.The number of collision domains would increase.
C.The number of broadcast domains would remain the same.
D.The number of collision domains would remain the same.
E. The number of broadcast domains would increase.

3.單項選擇題

Refer to the graphic.Host A is communicating with the seiver. What will be the source MAC address of the frames received by Host A from the server?（）

A.the MAC address of the seiver network interface
B.the MAC address of host A
C.the MAC address of router interface e 1
D.the MAC address of router interface e0

4.多項選擇題Which of the following correctly describe steps in the OSI data encapsulation process?（）

A.The transport layer divides a data stream into segments and may add reliability and flow control information.
B.The data link layer adds physical source and destination addresses and an FCS to the segment.
C.Packets are created when the network layer encapsulates a frame with source and destination host addresses and protocol-related control information.
D.Packets are created when the network layer adds Layer 3 addresses and control information to a segment.
E.The presentation layer translates bits into voltages for transmission across the physical link.