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The network layer provides services to the transport layer．It can be based on either （1)．I

The network layer provides services to the transport layer．It can be based on either (1)．In both cases，its main job is (2) packets from the source to the destination．

In network layer，subnets can easily become congested，increasing the delay and (3).

for packets．Network designers attempt to avoid congestion by proper design．Techniques include (4) policy，caching，flowcontrol，and more．

The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service．The methods that can be used for this include buffering at the client，traffic shaping，resource (5)，and admission control．Approaches that have been designed for good quality of service include integrated services(including RSVP) ，differentiated services， and MPLS．

(1)

A．virtual circuits or datagrams

B．TCP or UDP

C．TCP or IP

D．IP or ARP

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更多“The network layer provides services to the transport layer．It can be based on either （1)．I”相关的问题

第1题

根据下面的文字资料回答 71～75 题 The Simple Network Management Protocol（SNMP)is an （1 ）pr

根据下面的文字资料回答 71～75 题 The Simple Network Management Protocol(SNMP)is an （1 ）protocol that facilitates the exchange of management information between （2 ）．It is part of the Transmission Control ProtocoL/Internet Protocol(TCP/IP)protocol suite. SNMP enables network（3 ）to manage network performance，find and sole network problems，and plan for（4 ）．An SNMP managed network consists of three key components：managed devices，（5 ），and networkmanagement systems．

第6题：文中（1 ）处正确的答案是（）。

A．Physical Layer

B．Link Layer

C．Network Layer

D．Transport Layer

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第2题

Which layer-function is mostly implemented in a network adapter（）。A.Physical layer and

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

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第3题

The Address Resolution Protocol（ARP) is employed at （).A、Network Interface LayerB、Inte

A.Network Interface Layer

B.Internetwork Layer

C.Host-to-Host Transport Layer

D.Application Layer

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第4题

TCP/IP communication protocol contains four layers． From bottom to top, the four layers ar

e __（71）__．

A.network interface layer, internet layer, transport layer and application layer

B.internet layer, network interface layer, transport layer and application layer

C.network interface layer, transport layer, network interface layer and application layer

D.application layer, transport layer, internet layer and network interface layer

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第5题

● TCP/IP communication protocol contains four layers. From bottom to top, the four layers

are __(71)__.

（71）A．network interface layer, internet layer, transport layer and application layer

B．internet layer, network interface layer, transport layer and application layer

C．network interface layer, transport layer, network interface layer and application layer

D．application layer, transport layer, internet layer and network interface layer

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第6题

（) layer just above the internet layer.A、Network InterfaceB、TCPC、Host－to－Host Transpor

() layer just above the internet layer.

A、Network Interface

B、TCP

C、Host-to-Host Transport

D、Application

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第7题

The TCP protocolis a （）layer protocol.

A.physical

B.network

C.transport

D.application

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第8题

Which of the following options lists the steps in PPP session establishment in the correct order？（）

A. Optional authentication phase, link establishment phase, network layer protocol phase.

B. Network layer protocol phase, link establishment phase, optional authentication phase.

C. Network layer protocol phase, optional authentication phase, link establishment phase.

D. Link establishment phase, network layer protocol phase, optional authentication phase.

E. Link establishment phase, optional authentication phase, network layer protocol phase.

F. Optional authentication phase, network layer protocol phase, link establishment phase.

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第9题

While troubleshooting a connectivity problem on the network, you issue the ping command fr

om your PC command prompt, but the output shows "request times out."

At which OSI layer is this problem associated with？

A．The data link layer

B．The application layer

C．The access layer

D．The session layer

E．The network layer

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第10题

Which of the following layers is associated with the physical hardware address of a network node？（）

A.Layer 1

B.Layer 2

C.Layer 6

D.Layer 7

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第11题

Which layer of the OSI/RM do proxy servers usually address？（)

A.Physical layer

B.Network layer

C.Transport layer

D.Application layer

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