多选题For what two purposes does the Ethernet protocol use physical addresses?（）Ato uniquely identify devices at Layer 2Bto allow communication with devices on a different networkCto differentiate a Layer 2 frame from a Layer 3 packetDto establish a priority

题目

多选题

For what two purposes does the Ethernet protocol use physical addresses?（）

to uniquely identify devices at Layer 2

to allow communication with devices on a different network

to differentiate a Layer 2 frame from a Layer 3 packet

to establish a priority system to determine which device gets to transmit first

to allow communication between different devices on the same network

to allow detection of a remote device when its physical address is unknown

参考答案和解析

正确答案： A,E

解析：暂无解析

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相似问题和答案

第1题：

What are two advantages of Layer 2 Ethernet switches over hubs?()

A. decreasing the number of collision domains

B. filtering frames based on MAC addresses

C. allowing simultaneous frame transmissions

D. increasing the size of broadcast domains

E. increasing the maximum length of UTP cabling between devices

参考答案：B, C

第2题：

What are two reasons a network administrator would use CDP (Choose two.)()。

A.to verify the type of cable interconnecting two devices

B.to determine the status of network services on a remote device

C.to obtain VLAN information from directly connected switches

D.to verify Layer 2 connectivity between two devices when Layer 3 fails

E.to obtain the IP address of a connected device in order to telnet to the device

F.to determine the status of the routing protocols between directly connected routers

参考答案：D, E

第3题：

Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices)

A. The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address.

B. The DHCP Discover message uses UDP as the transport layer protocol.

C. The DHCP Discover message uses a special Layer 2 multicast address as the destination address.

D. The DHCP Discover message uses TCP as the transport layer protocol.

E. The DHCP Discover message does not use a Layer 2 destination address.

F. The DHCP Discover message does not require a transport layer protocol.

正确答案：AB
A,B 解析：Explanation:
DHCP uses UDP as its transport protocol. DHCP messages from a client to a server are sent to the DHCP server port (UDP port 67), and DHCP messages from a server to a client are sent to the DHCP client port (UDP port 68).The client broadcasts a DHCPDISCOVER message on its local physical subnet. The DHCPDISCOVER message may include options that suggest values for the network address and lease duration. BOOTP relay agents may pass the message on to DHCP servers not on the same physical subnet.

Each server may respond with a DHCPOFFER message that includes an available network address in the "ipaddr" field (and other configuration parameters in DHCP options). Servers need not reserve the offered network address, although the protocol will work more efficiently if the server avoids allocating the offered network address to another client. The server unicasts the DHCPOFFER message to the client (using the DHCP/BOOTP relay agent if necessary) if possible, or may broadcast the message to a broadcast address (preferably 255.255.255.255) on the client's subnet.

Incorrect Answers:
C. DHCP messages are broadcast to the "all hosts" address. IP multicast addresses are not used.

D. UDP is used, not TCP.

E. Since DHCP is used so that a client can obtain an IP address, a layer two destination address must be used, as the layer 3 IP address does not yet exist on the client for the return traffic.

F. DHCP, along with nearly every other type of traffic, requires the use of a transport layer protocol.

第4题：

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.

正确答案:A,D

第5题：

Networks can be interconnected by different devices.In the physical layer, networks can be connected by（） or hubs, which just move the bits from one network to an identical network.

A.repeaters
B.relays
C.connectors
D.modems

答案：A

解析：

学好英语，一切都很简单。

第6题：

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

参考答案：A, E

第7题：

Networks can be interconnected by different devices in the physical layer networks can be connected by（）_or hubs.which just move the bits from one network to an identical network.One layer up we find bridges and switches which operate at data link layer.They can accept（）examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer,we have routers that can connect two networks,If two networks have（）network layer,the router may be able to translate between the packer formats.In the transport layer we find transport gateway,which can interface between two transport connections Finally,in the application layer,application gateways translate message（请作答此空）.As an example,gateways between Internet e-mail and X.400 e-mail must（）the e-mail message and change various header fields.

A.syntax
B.semantics
C.language
D.format

答案：B

解析：

第8题：

What are two routing requirements for a device to communicate with another device?()

A. end-to-end communications path

B. hosts on the same Layer 2 broadcast domain

C. hosts on the same Layer 3 broadcast domain

D. routing information on participating Layer 3 devices

参考答案：A, D

第9题：

In which two locations in an enterprise network can an IPS sensor be placed?（）

A、bridging VLANs on two switches
B、bridging two VLANs on one switch
C、between two Layer 2 devices withtrunking
D、between two Layer 2 devices withouttrunking
E、between a Layer 2 device and a Layer 3 device withtrunking

正确答案:C,D

第10题：

What are two advantages of Layer 2 Ethernet switches over hubs?（）

A、decreasing the number of collision domains
B、filtering frames based on MAC addresses
C、allowing simultaneous frame transmissions
D、increasing the size of broadcast domains
E、increasing the maximum length of UTP cabling between devices

正确答案:B,C

多选题For what two purposes does the Ethernet protocol use physical addresses?（）Ato uniquely identify devices at Layer 2Bto allow communication with devices on a different networkCto differentiate a Layer 2 frame from a Layer 3 packetDto establish a priority

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