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NSAPI的全称为Network layer Service Access Point Identifier。（）
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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 datagramsB．TCP or UDPC．TCP or IPD．IP or ARP
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In the open systems interconnection (OSI) reference model, "layer" means one of seven conceptually complete,(71) arranged groups of services, functions, and protocols, that extend across all open systems.Application layer provides means for the application(72) to access the OSI environment. Presentation layer provides for the selection of a common syntax for representing data.(73) layer provides the means necessary for cooperating presentation entities to organize and synchronize their dialog and to manage their data exchange. Transport layer provides a reliable end-to-end data transfer service. Network layer provides for the entities in the transport layer the means for transferring blocks of data, by(74) and switching through the network between the open systems in which those entities reside. Data link layer provides services to transfer data between network layer entities. Physical layer provides the mechanical, electrical, functional, and procedural means to establish, maintain and(75) physical connections for transfer of bits over a transmission medium.A．ranklyB．levellyC．layeredD．hierarchically
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● 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 layerB．internet layer, network interface layer, transport layer and application layerC．network interface layer, transport layer, network interface layer and application layerD．application layer, transport layer, internet layer and network interface layer
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TCP/IP communication protocol contains four layers． From bottom to top, the four layers are __（71）__．A.network interface layer, internet layer, transport layer and application layerB.internet layer, network interface layer, transport layer and application layerC.network interface layer, transport layer, network interface layer and application layerD.application layer, transport layer, internet layer and network interface layer
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Which layer-function is mostly implemented in a network adapter（ ）。A.Physical layer and link layerB.Network layer and transport layerC.Physical layer and network layerD.Transport layer and application layer
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Together with the network layer,the transport layer is the heart of the protocol（ ）The network layer provides end-to-end（ ） delivery using datagrams or virtual circuits.The transport layer builds on the network layer to provide data transport from a process on a（ ）machine to a process on a destination machine with a desired level of reliability that is independent of the physical （ ） currently in use.It provides the abstractions that applications nedd to use the network..Without the（ ） layer,the whole concept of layered protocols would make little sense.A.transport B.network C.hierarchy D.service A.packet B.data C.command D.record A.connection B.terminal C.source D.destination A.traffic B.connection C.lines D.networks A.network B.transport C.link D.physical
考题
How is network layer addressing accomplished in the OSI protocol suite?()
A. Internet Protocol addressB. Media Access Control addressC. Packet Layer Proto col addressD. Network Service Access Point addressE. Authority and Format Identifier address
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Which two of these are characteristics of MPLS VPNs?()
A. Layer 3 MPLS VPNs can forward only IP packetsB. Layer 2 MPLS VPNs can forward any network protocolC. MPLS label paths are automatically formed based on Layer 2 framesD. Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 framesE. In Layer 2 MPLS VPNS, the service provider controls the customer Layer 3 policies
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What can a network administrator utilize by using PPP Layer 2 encapsulation (Choose three.) ()。
A.VLAN supportB.compressionC.authenticationD.sliding windowsE.multilink supportF.quality of service
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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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Together with the network layer,the transport layer is the heart of the protocol ( 请作答此空).The network layer provides end-to-end () delivery using datagrams or virtual circuits.The transport layer builds on the network layer to provide data transport from a process on a () machine to a process on a destination machine with a desired level of reliability that is independent of the physical () currently in use.It provides the abstractions that applications nedd to use the network..Without the () layer,the whole concept of layered protocols would make little sense.A.transport
B.network
C.hierarchy
D.service
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●The network layer provides services to the transport layer.It can be based on either（71）.In both cases,its main job is（请作答此空）packets from the source to the destination.In network layer,subnets can easily become congested，increasing the delay and（73）for packets.Network designers attempt to avoid congestion by proper design.Techniques include（74）policy,caching,flow control,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（75），and admission control.Approaches that have been designed for good quality of service include integrated services（including RSVP）,differentiated services，and MPLS.A.dealing with
B.routing
C.sending
D.receiving
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When you design QoS on CE for an MPLS Layer 2 VPN， which three things should be considered？（）A、Layer 2 access link QoS designB、enterprise-to-service-provider mapping modelsC、Layer 3 link access QoS designD、service provider service level agreementsE、Layer 2 link access load balancing
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What makes the Cisco End-to-End solution superior to competitor offerings?（）A、The Cisco Full-Service network foundation delivers a layered security approach that introduces interoperability issuesB、The Cisco Full-service Network Foundation Increases the support CostC、The Cisco Full-Service Network Foundation delivers a static single layer security approach that eliminates the interoperability issuesD、The Cisco Full-Service Network Foundation Delivers a layered security Approach that eliminates the interoperability issues
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Which technology is an example of the need for a designer to clearly define features and designedperformance when designing advanced WAN services with a service provider？（）A、 FHRP to remote branches.B、 Layer 3 MPLS VPNs routing.C、 Control protocols （for example Spanning Tree Protocol） for a Layer 3 MPLS service.D、 Intrusion prevention， QoS， and stateful firewall support network wide.
考题
How is network layer addressing accomplished in the OSI protocol suite?（）A、Internet Protocol addressB、Media Access Control addressC、Packet Layer Proto col addressD、Network Service Access Point addressE、Authority and Format Identifier address
考题
Which two of these are characteristics of MPLS VPNs？ （）A、 Layer 3 MPLS VPNs can forward only IP packetsB、 Layer 2 MPLS VPNs can forward any network protocolC、 MPL S label paths are automatically formed based on Layer 2 framesD、 Layer 3 MPLS VPNs can forward any network protocol based on Layer 2 framesE、 In Layer 2 MPLS VPNS， the service provider controls the customer Layer 3 policies
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Which three statements are true about Cisco IOS Firewall？（）A、It can be configured to block Java traffic.B、It can be configured to detect and prevent SYN-flooding denial-of-service （DoS） network attacks.C、It can only examine network layer and transport layer information.D、It can only examine transport layer and application layer information.E、The inspection rules can be used to set timeout values for specified protocols.F、The ip inspect cbac-name command must be configured in global configuration mode.
考题
What can a network administrator utilize by using PPP Layer 2 encapsulation (Choose three.) （）。A、VLAN supportB、compressionC、authenticationD、sliding windowsE、multilink supportF、quality of service
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多选题Which three statements are true about Cisco IOS Firewall？（）AIt can be configured to block Java traffic.BIt can be configured to detect and prevent SYN-flooding denial-of-service （DoS） network attacks.CIt can only examine network layer and transport layer information.DIt can only examine transport layer and application layer information.EThe inspection rules can be used to set timeout values for specified protocols.FThe ip inspect cbac-name command must be configured in global configuration mode.
考题
多选题What can a network administrator utilize by using PPP Layer 2 encapsulation? (Choose three.)（）AVLAN supportBcompressionCauthenticationDsliding windowsEmultilink supportFquality of service
考题
多选题Which two of these are characteristics of MPLS VPNs?（）ALayer 3 MPLS VPNs can forward only IP packetsBLayer 2 MPLS VPNs can forward any network protocolCMPLS label paths are automatically formed based on Layer 2 framesDLayer 3 MPLS VPNs can forward any network protocol based on Layer 2 framesEIn Layer 2 MPLS VPNS, the service provider controls the customer Layer 3 policies
考题
单选题What makes the Cisco End-to-End solution superior to competitor offerings?（）A
The Cisco Full-Service network foundation delivers a layered security approach that introduces interoperability issuesB
The Cisco Full-service Network Foundation Increases the support CostC
The Cisco Full-Service Network Foundation delivers a static single layer security approach that eliminates the interoperability issuesD
The Cisco Full-Service Network Foundation Delivers a layered security Approach that eliminates the interoperability issues
考题
单选题Which technology is an example of the need for a designer to clearly define features and designedperformance when designing advanced WAN services with a service provider？（）A
FHRP to remote branches.B
Layer 3 MPLS VPNs routing.C
Control protocols （for example Spanning Tree Protocol） for a Layer 3 MPLS service.D
Intrusion prevention， QoS， and stateful firewall support network wide.
考题
单选题How is network layer addressing accomplished in the OSI protocol suite?（）A
Internet Protocol addressB
Media Access Control addressC
Packet Layer Proto col addressD
Network Service Access Point addressE
Authority and Format Identifier address
考题
判断题NSAPI的全称为Network layer Service Access Point Identifier。（）A
对B
错
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