肖洛霍夫的《静静的顿河》是一部宏伟的史诗。静静的顿河，你的流水像镜子一样。 ______ 着歌萨克地区

u are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.

Which of the following are layer 1 devices that you can use？ (Choose all that apply.)

A．A switch

B．A router

C．A network adapter card

D．A hub

E．A repeater

u are instructed to enlarge the area covered by a single LAN segment on the TestKing network.Which of the following are layer 1 devices that you can use？（）

A. A switch.

B. A router.

C. A network adapter card.

D. A hub.

E. A repeater.

The IoT architecture can be divided into three layers.()is the key layer to realize the foundational capabilities which support the electronic devices interact with physical worl

A.

B.Sensing layer

C.Network layer

D.Application layer

E.Operation layer

A．A.6100 serves as devices at convergence layer.

B．B.9000 is used at core layer.

C．C.6200 is used at access layer and convergence layer.

D．D.6300 is used at convergence layer.

connected by(1)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(2)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(3)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(4). As an example, gateways between Internet e-mail and X.400 e-mail must(5)the e-mail message and change various header fields.

A．reapers

B．relays

C．packages

D．modems

A. Layer 2 broadcast frames are processed by all devices on the same VLAN

B. Layer 2 broadcast frames are discarded by routers that connect to multiple VLANs

C. Layer 2 broadcast frames are relayed by routers to all connected VLANs

D. Layer 2 broadcast frames are relayed by switches to devices on the same VLAN

A. can be used over analog circuits

B. maps Layer 2 to Layer 3 address

C. encapsulates several routed protocols

D. supports IP only

E. provides error correction

●LANs can be connected by using bridges，which operate in the (67) .

(67) A．data-link layer

B．Physical layer

C．network layer

D．transport layer

Flow control is a function that prevents network congestion by ensuring that(71)do not overwhelm(72)with data. There are three commonly used methods for handling network congestion.(73)is used by network devices to temporarily store bursts of excess data in memory until they can be processed. (74)are used by receiving devices to help prevent their buffers from overflowing.(75)is a flow -control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.

A．transmitting devices

B．transmitted devices

C．receiving devices

D．received devices