ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589)
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Exam : 640-802Title: Cisco Certified Network AssociateVer: 08.15.08640-802QUESTION 1:Both switches and hubs are being utilized within the Certkiller network. Which ofthe following is true regarding the use of switches and hubs for network connectivityin this network?A. Switches take less time to process frames than hubs takeB. Hubs can filter framesC. Switches do not forward broadcastsD. Switches increase the number of collision domains in the networkE.
Using hubs can increase the amount of bandwidth available to hostsF. None of the aboveAnswer: DExplanation:The biggest benefit of using switches instead of hubs in your internetwork is that eachswitch port is actually its own collision domain. (Conversely, a hub creates one largecollision domain.) But even armed with a switch, you still can't break up broadcastdomains. Neither switches nor bridges will do that.
They'll typically simply forward allbroadcasts instead. Switch creates the collision domain per port, so we can say switchincrease the number of collision domains.QUESTION 2:Which one of the following characteristics is true regarding the use of hubs andswitches?A. Hubs can have their ports be configured with VLANsB. Using hubs is costly with regard to bandwidth availability.C. Switches can not forward broadcasts.D. Switches are more efficient than hubs in processing frames.E.
Switches increase the number of collision domains in the network.Answer: EExplanation: Switches increases the number of collisions domains in the network.Switches that are configured with VLANs will reduce the size of the collisiondomains by increasing the number of collision domains in a network, but makingthem smaller than that of one big, flat network.Incorrect Answers:A. Switches are capable of VLAN configurations, but hubs are not.Actualtests.com - The Power of Knowing640-802B. Hubs are generally the least costly method possible to connect multiple devicestogether in a network.C. Switches forward broadcasts and multicasts, by default, to all ports within the sameVLAN. Only routers block all broadcast traffic by default.D.
Switches and hubs can be equally efficient in processing frames, in theory. In practice,switches are generally more efficient as they usually have more CPU and memoryallocated to them, and are generally much more expensive than a simple hub.QUESTION 3:When comparing and contrasting the similarities and differences between bridgesand switches, which of the following are valid statements? Choose all the validanswer choices)A.
Bridges are faster than switches because they have fewer ports.B. A switch is a multiport bridge,C. Bridges and switches learn MAC addresses by examining the source MAC address ofeach frame received.D. A bridge will forward a broadcast but a switch will not.E. Bridges and switches increase the size of a collision domain.F. None of the above statements are true.Answer: B, CExplanation:Both bridges and switches build the bridge table by listening to incoming frames andexamining the source MAC address in the frame.Switches are multiport bridges that allow you to create multiple broadcast domains.
Eachbroadcast domain is like a distinct virtual bridge within a switch.Incorrect Answers:A. Switches are generally faster than bridges. Bridges also do not necessarily have fewerports than switches.D. Both bridges and switches will forward broadcast and multicast traffic, assuming thatthe traffic remains in the same VLAN.E. The use of VLANs in a switch can decrease the size of the collision domain, bycreating additional, smaller collision domains.QUESTION 4:Which of the following correctly describe the various functions and virtues of arouter? (Select all valid answer choices)A. Packet switchingActualtests.com - The Power of Knowing640-802B.
Collision prevention on a LAN segment.C. Packet filteringD. Broadcast domain enlargementE. Broadcast forwardingF. Internetwork communicationG. None of the aboveAnswer: A, C, FExplanation:The main function of a router is to connect different, separated networks together. Indoing so, switching packets from one network to another is a primary function, alongwith providing for communication between networks.
As an additional feature, routersare capable of providing filtering on a network address and application port level, sochoice C is also correct.Incorrect Answers:B. Routers can indeed be used to segment a network separate a collision domain, sincerouters do not forward LAN broadcasts and multicasts to other interfaces. However,routers alone can not prevent all collisions from occurring on any given LAN segment.D.
Routers actually segment LANs into smaller broadcast domains.E. Routers do not forward broadcast and multicast traffic out the additional interfaces bydefault. Unless bridging or IP helpers are configured on the router, LAN broadcasts areblocked at the router level.QUESTION 5:The LAN needs are expanding at the Certkiller corporate office, which is quicklygrowing. You are instructed to enlarge the area covered by a single LAN segment onthe Certkiller network.Which of the following are layer 1 devices that you can use? (Choose all that apply.)A. A switchB. A routerC. A network adapter cardD.
A hubE. A repeaterAnswer: D, EExplanation:A hub simply repeats the electrical signal and makes no attempt to interpret the electricalsignal (layer 1) as a LAN frame (Layer 2). So, a hub actually performs OSI layer 1functions, repeating an electrical signal, whereas a switch performs OSI layer 2functions, actually interpreting Ethernet header information, particularly addresses, tomake forwarding decisions. Hubs can be used to increase the number of stations that canActualtests.com - The Power of Knowing640-802be supported on a LAN.Because the repeater does not interpret what the bits mean, but does examine andgenerate electrical signals, a repeater is considered to operate at Layer 1.
Repeaters canbe used to physically extend the LAN to greater distances.QUESTION 6:Cisco is the leader in the router market space. What basic functions do their routersperform in a network? (Choose two)A. The microsegmentation of broadcast domainsB. Path selectionC. Packet switchingD.
Bridging between LAN segmentsE. Access layer securityF. VLAN membership assignmentG. Application optimizationAnswer: B, CExplanation:The primary functions of a router are: Packet Switching and Path Selection. It is therouters job to determine the best method for delivering the data, and switching that dataas quickly as possible.QUESTION 7:Both bridges are switches are being used throughout the Certkiller LAN. Which ofthe 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.Answer: B, E, FQUESTION 8:As a network administrator, you will need to decide on the appropriate networkActualtests.com - The Power of Knowing640-802devices to use. Which of the following correctly describes the roles of devices in aWAN? (Choose three)A. A CSU/DSU terminates a digital local loop.B. A router is commonly considered a DCE device.C. A modem terminates an analog local loop.D.
A router is commonly considered a DTE device.E. A modem terminates a digital local loop.F. A CSU/DSU terminates an analog local loop.G. A modem is used to terminate a T1Answer: A, C, DExplanation:Layer 2 switching is considered hardware-based bridging because it uses specializedhardware called an application-specific integrated circuit (ASIC). ASICs can run up togigabit speeds with very low latency rates.Switches usually have higher port number then bridge. Generally bridges have two ports.Both operates on Data link layer.QUESTION 9:The Certkiller network administrator needs to determine what LAN devices toinstall on the Certkiller network.
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