●LANs can be connected by using bridges，which operate in the (67) .(67) A．data-link layerB．Physical layerC．network layerD．transport layer

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

The Simple Network Management Protocol(SNMP)is an(66)protocol that facilitates the exchange of management information between(67). It is part of the Transmission Control Protocol/Internet Protocol(TCP/IP)protocol suite. SNMP enables network(68)to manage network performance, find and sole network problems, and plan for(69)An SNMP -managed network consists of three key components: managed devices ,(70),and network -management systems .

A．Physical Layer

B．Link Layer

C．Network Layer

D．Transport Layer

Networks can be interconnected by different devices. In the physical layer, networks can be connected by(66)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(67), examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have(68)network layer, the router may be able to translate between the packet formats. In the transport layer we fmd transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message(69). As an example, gateways between Internet e-mail and X.400 e-mail must(70)the e-mail message and change various header fields.

A．repeaters

B．relays

C．connectors

D．modems

The(66)is a channel's capacity which directly reflects the data transfer rate of the channel.

(67)functions in a NetWare network which is used to define addressing schemes.

The(68)is a network layer device that supports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.

(69)is the popular LAN developed under the direction of the IEEE802.3.

The(70 is a device which enables digital microcomputers to communicate across analog telephone lines.

A．volume

B．bandwidth

C．noise

D．delay

A Ezonexam technician is troubleshooting connectivity problems between two routers that are directly connected through the serial line. The technician notices that the serial line is up but cannot see any neighbors displayed in the output of the show cdp neighbors command.

In which OSI layer is the problem most likely occurring?

A．Physical

B．Data link

C．Network layer

D．Transport layer

E．Application layer

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

A．data-link layer

B．Physical layer

C．network layer

D．transport layer

A. Switches are primarily software based while bridges are hardware based.

B. Both bridges and switches forward Layer 2 broadcasts.

C. Bridges are frequently faster than switches.

D. Switches typically have a higher number of ports than bridges.

E. Bridges define broadcast domain while switches define collision domains.

F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.

● Networks can be interconnected by different devices. In the physical layer，networks can be 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 the 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 packet 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.

（1）

A.reapers

B.relays

C.connectors

D.modems

（2）

A.frames

B.packets

C.packages

D.cells

（3）

A.specia l

B.dependent

C.similar

D.dissimilar

（4）

A.syntax

B.semantics

C.language

D.format

（5）

A.analyze

B.parse

C.delete

D.create

Which OSI layer does a bridge operate at?

A．the Physical Layer

B．the Network Layer

C．the Transport Layer

D．the Data Link Layer

Both bridges are switches are being used throughout the Ezonexam LAN. Which of the following statements are true regarding bridges and switches in this network?

(Choose 3)

A. Switches are primarily software based while bridges are hardware based.

B. Switches usually have a higher number of ports than most bridges.

C. Bridges are frequently faster than switches.

D. Bridges define broadcast domains while switches define collision domains.

E. Both bridges and switches forward Layer 2 broadcasts.

F. Both bridges and switches make forwarding decisions based on Layer 2 addresses.

Different quality factors of software can be reflected upon user's different points of view, through product running, product modification and product transformation. Of the following properties, which one is connected with product running?(67).

Ⅰ. correctness

Ⅱ. robustness

Ⅲ. re-use

A．Ⅰ

B．Ⅱ

C．Ⅰ, Ⅱ

D．以上都是

is a channel' s capacity which directly reflects the data transfer rate of the channel.(67)functions in a NetWare network which is used to define addressing schemes.(68)is a network layer device that suports multiple LAN interfaces and segments LANs into smaller collision and broadcast domains.(69)．is the popular LAN develped under the direction of the IEEE 802.3.(70)is a device which enables digital microcomputers to communicate across analog telephone lines.

A．The volume

B．The bandwidth

C．The noise

D．The delay

A.Layer 1

B.Layer 4

C.Layer 6

D.Layer 7

Which layer-function is mostly implemented in a network adapter（ ）。

A.Physical layer and link layer

B.Network layer and transport layer

C.Physical layer and network layer

D.Transport layer and application layer

Most IP layer-based proxy mechanisms, such as network address translation(NAT), only support uni-directional proxy, from the internal network to external network(the Internet). The proxy establishes the communication channel by(66)IP addresses. The IP addresses must be(67). These proxy mechanisms prevent applications that must establish return data channels from establishing their data channels, such as, multimedia applications. IP layer-based proxy mechanisms need additional software(68)for each application that uses(69)channels. SOCKS identifies communication targets through domain names, overcoming the restriction of using private IP addresses. SOCKS can use domain names to establish communication between separate LANs, with(70)IP addresses.

A．manufacturing

B．manipulating

C．conduct

D．implement

A.Switches are primarily software based while bridges are hardware based.

B.Both bridges and switches forward Layer 2 broadcasts.

C.Bridges are frequently faster than switches.

D.Switches have a higher number of ports than most bridges.

E.Bridges define broadcast domains while switches define collision domains.

F.Both bridges and switches make forwarding decisions based on Layer 2 addresses.

根据下面的文字资料回答 71～75 题 connected by（ 1 ）or Hubs,which just move the bits from one network to an identical network. One layer up we find bridgas and swiehes,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 the network layer,we have touters that can connect two netwoks. If two networks have（ 3 ）network layer,the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which cart interface between the 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.

第6题：文中（ 1 ）处正确的答案是（ ）。

A．reapers

B．relays

C．connects

D．modems