Traditional network layer packet forwarding relies on the information provided by network layer （） protocols, or static routing, to make an independent （本题）decision at each hop within the network. The forwarding （）is based solely on the destination （）IP address. All packets for the same destination follow the same path across the network if no other equal-cost paths exist. Whenever a router has two equal-cost （）toward a destination, the packets toward the destination might take one or both of them, resulting in some degree of load sharing.A.switchB.hopC.hostD.cunstomer
Traditional network layer packet forwarding relies on the information provided by network layer （） protocols, or static routing, to make an independent （本题）decision at each hop within the network. The forwarding （）is based solely on the destination （）IP address. All packets for the same destination follow the same path across the network if no other equal-cost paths exist. Whenever a router has two equal-cost （）toward a destination, the packets toward the destination might take one or both of them, resulting in some degree of load sharing.
A.switch
B.hop
C.host
D.cunstomer
B.hop
C.host
D.cunstomer
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阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the routers network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the routers routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.A．is generating B．generate C．is generated D．generates A．forwarding table B．network interfaces C．routing policies D．destination address A．the destination address and network interfaces B．forwarding table and network interfaces C．the destination address and forward table D．routing policies and routing table
CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)A. To determine the status of network services on a remote deviceB. To obtain the IP Address of a connected device in order to telnet to the deviceC. To verify the type of cable interconnecting two devicesD. To verify Layer 2 connectivity between two devices when Layer 3 failsE. To obtain VLAN information from directly connected swticehsF. To determine the status of the routing protocols between directly connected routersG. To support automatic network failover during outages
TCP functions at the Open System Interconnection(OSI)(61)layer, or Layer 4. Its chief responsibility is to ensure(62)end-to-end connectivity. IP, located one layer down, at the OSI network layer, or Layer 3, communicates the addresses of each(63)sender and receiver to the routers along the way. Routers and Layer 3 switches can read IP and other Layer 3(64). This information, combined with routing tables and other network intelligence, is all it takes to get(65)the room or around the world via TCP/IP.A．transposeB．translateC．transmitD．transport
Router VE1 has just received a packet and needs to route it. What two actions must this router take in order to route incoming packets? (Choose two)A. Inspect the routing table to select the best path to the destination network addresses.B. Validate sources of routing information.C. Inspect the ARP table to verify a legitimate source MAC address for each packet.D. Identify the destination network address of each packet.E. Verify the receipt of routed packets by the next hop router.F. Identify the source network address of each packet.
Which three statements are true of dynamic routing protocols?() A.They are scalable.B.They are Dijkstra based.C.They share network layer reach ability information among neighbors.D.They automate next hopdecisions.E.They are tolerant of configuration errors.
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
Routers perform the decision process that selects what path a packet takes. These （ ） layer devices participate it the collection and distribution of network-layer information, and perform Layer 3 switching based on the contents of the network layer （ ） of each packet. You can connect the routers directly by point-to-point （ ） or local-area networks, or you can connect them by LAN or WAN switches. These Layer 2 switches unfortunately do not have the capability to hold Layer 3 （ ） information or to select the path taken by a packet through analysis of its Layer 3 destination address. Thus, Layer 2 switches be involved in the Layer 3 packet （ ） decision process.A.application B. network C.physical D.link A.header B.connection C.protocol D.data A.medium B.links C.switches D.carriers A.network B.links C.protocol D.routing A.switching B.processing C.forwarding D.connecting
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.transportB.networkC.hierarchyD.service
Traditional IP packet forwarding analyzes the（ ）IP address contained in the network layer header of each packet as the packet travels from its source to its final destination.A router analyzes the destination IP address independently at each hop in the network.Dynamic（ ）protocols or static configuration builds the database needed to analyze the destination IP address（the routing table）.The process of implementing traditional IP routing also is called hop-by-hop destination-based（ ）routing.Although successful，and obviously widely deployed，certain restrictions，which have been realized for some time，exist for this method of packet forwarding that diminish is（请作答此空）.New techniques are therefore required to address and expand the functionality of an IP-based network infrastructure.This first chapter concentrates on identifying these restrictions and presents a new archiecture，known as multiprotocol（ ）switching，that provides solutions some of these restrictions.A.reliabilityB.flexibilityC.stabilityD.capability
Traditional network layer packet forwarding relies on the information provided by network layer（ ）protocols,or static routing,to make an independent forwarding decision at each（本题）within the network．The forwarding decision is based solely on the destination（ ）IP address．All packets for the same destination follow the same path across the network if no other equal-cost（ ）exist．Whenever a router has two equal-cost pathstoward a destination,the packets toward the destination might take one or both of them,resulting in some degree of load sharing．Enhanced Interior Gateway Routing Protocol（EIGRP）also supports non-equal-cost（ ）sharing although the default behavior of this protocol is equal-cost．You must configure EIGRP variance for non-equal-cost load balancing．A.switchB.hopC.hostD.customer
Traditional network layer packet forwarding relies on the information provided by network layer（ ）protocols,or static routing,to make an independent forwarding decision at each（ ）within the network．Theforwarding decision is based solely on the destination（本题）IP address．All packets for the same destination follow the same path across the network if no other equal-cost（ ）exist．Whenever a router has two equal-cost pathstoward a destination,the packets toward the destination might take one or both of them,resulting in some degree of load sharing．Enhanced Interior Gateway Routing Protocol（EIGRP）also supports non-equal-cost（ ）sharing although the default behavior of this protocol is equal-cost．You must configure EIGRP variance for non-equal-cost load balancing．A.connectionB.transmissionC.broadcastD.customer
Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?（）A、A routing protocol is assigned to an interface and determines the method of packet delivery.B、A routed protocol is assigned to an interface and determines the method of packet delivery.C、A routing protocol determines the path of a packet through a network.D、A routed protocol determines the path of a packet through a network.E、A routing protocol operates at the transport layer of the OSI model.F、A routed protocol updates the routing table of a router.
Which of the following statements regarding routed and routing protocols are true?（）A、A routed protocol is assigned to an interface and determines the method of packet deliver.B、A routing protocol determines the path of a packet through a network.C、A routed protocol determines the path of a packet through a network.D、A routing protocol operates at the transport layer of the OSI model.E、A routed protocol updates the routing table of a router.
What is a static packet-filtering firewall used for ？（）A、It validates the fact that a packet is either a connection request or a data packet belonging to a connectionB、It evaluates network packets for valid data at the application layer before allowing connectionsC、It analyzes network traffic at the network and transport protocol layersD、It keeps track of the actual communication process through the use of a state table
Company uses layer 3 switches in the Core of their network. Which method of Layer 3 switching uses a forwarding information base （FIB）？（）A、Topology-based switchingB、Demand-based switchingC、Route cachingD、Flow-based switchingE、None of the other alternatives apply
Which three statements are true of dynamic routing protocols?（）A、They are scalable.B、They are Dijkstra based.C、They share network layer reach ability information among neighbors.D、They automate next hopdecisions.E、They are tolerant of configuration errors.
Which three statements are true of dynamic routing protocols？（）A、They are scalable.B、They are Dijkstra based.C、They share network layer reachability information among neighbors.D、They automate next hop decisions.E、They are tolerant of configuration errors.
Which three statements accurately describe layer 2 Ethernet switches?（）A、Microsegmentation decreases the number of collisions on the network.B、if a switch receives a frame for an unkown destination,it uses ARP to resolve the address.C、Spanning Tree Protocol allows switches to automatically share vlan information.D、In a properly functioning network with redundant switched paths,each switched aegment will contain one root bridge with all its ports in the forwarding state.All other switches in that broadcast domain will have only one root port.E、Establishing vlans increases the number of broadcast domains.F、Switches that are configured with vlans make forwarding decisions based on both layer 2 and layer 3 address information.
Select the three best answers which best describe Private Network-to Network Interface （PNNI） in an ATM network.（）A、It is the Routing protocol used between ATM switchesB、PNNI uses the same Dijsktra algorithm for SPF calculationC、PNNI and OSPF use the same Database to make cohesive decision for packet forwardingD、PNNI measures line capacities and delays in addition to simple cost metrics
What are two reasons a network administrator would use CDP (Choose two.)（）。A、to verify the type of cable interconnecting two devicesB、to determine the status of network services on a remote deviceC、to obtain VLAN information from directly connected switchesD、to verify Layer 2 connectivity between two devices when Layer 3 failsE、to obtain the IP address of a connected device in order to telnet to the deviceF、to determine the status of the routing protocols between directly connected routers
What are two reasons a network administrator would use CDP?（）A、to verify the type of cable interconnecting two devicesB、to determine the status of network services on a remote deviceC、to obtain VLAN information from directly connected switchesD、to verify Layer 2 connectivity between two devices when Layer 3 failsE、to obtain the IP address of a connected device in order to telnet to the deviceF、to determine the status of the routing protocols between directly connected routers
多选题Part of the job as a network administrator is being able to make a distinction between routed protocols and routing protocols. Which of the following statements is true regarding them?（）AA routing protocol is assigned to an interface and determines the method of packet delivery.BA routed protocol is assigned to an interface and determines the method of packet delivery.CA routing protocol determines the path of a packet through a network.DA routed protocol determines the path of a packet through a network.EA routing protocol operates at the transport layer of the OSI model.FA routed protocol updates the routing table of a router.
多选题You work as a network technician. Your boss is interested in the QoS technology in the context ofvideo traffic. What can be said of application of this technology in this type of network？（）AThe access layer is the initial point at which traffic enters the network. Traffic is marked （orremarked） at Layers 2 and 3 by the access switch as it enters the network， or is trusted that it isentering the network with the appropriate tagBNo traffic marking occurs at the core layer. Layer 2/3 QoS tags are trusted from distributionlayer switches and used to prioritize and queue the traffic as it traverses the coreCTraffic inbound from the access layer to the distribution layer can be trusted or reset dependingupon the ability of the access layer switches. Priority access into the core is provided based onLayer 3 QoS tagsDIP precedence， DSCP， QoS group， IP address， and ingress interface are Layer 2 characteristics that are set by the access layer as it passes traffic to the distribution layer. Thedistribution layer， once it has made a switching decision to the core layer， strips these offEMAC address， Multiprotocol Label Switching （MPLS）； the ATM cell loss priority （CLP） bit， theFrame Relay discard eligible （DE） bit， and ingress interface are established by the voicesubmodule （distribution layer） as traffic passes to the core layerFThe distribution layer inspects a frame to see if it has exceeded a predefined rate of trafficwithin a certain time frame， which is typically a fixed number internal to the switch. If a frame isdetermined to be in excess of the predefined rate limit， the CoS value can be marked up in a waythat results in the packet being dropped
单选题What benefit results from implementation of Layer 3 switching versus Layer 2 switching in a fully meshed campus network？（）Aease of IP address assignment versus use of external routersBredundancy from trunking between distribution layer switchesCprovides first-hop redundancy to clientsDallows inter-VLAN communication without requiring complexity of routing protocols
多选题Which of the following statements regarding routed and routing protocols are true?（）AA routed protocol is assigned to an interface and determines the method of packet deliver.BA routing protocol determines the path of a packet through a network.CA routed protocol determines the path of a packet through a network.DA routing protocol operates at the transport layer of the OSI model.EA routed protocol updates the routing table of a router.
多选题Which three statements are true of dynamic routing protocols？（）AThey are scalable.BThey are Dijkstra based.CThey share network layer reachability information among neighbors.DThey automate next hop decisions.EThey are tolerant of configuration errors.
单选题Company uses layer 3 switches in the Core of their network. Which method of Layer 3 switching uses a forwarding information base （FIB）？（）ATopology-based switchingBDemand-based switchingCRoute cachingDFlow-based switchingENone of the other alternatives apply