ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 24
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The use of VLANs will increase the complexity of the switch environment, making formore difficult administration.Actualtests.com - The Power of Knowing640-802QUESTION 195:You wish to segment your LAN into multiple broadcast domains. Which technologymethod should you implement in order to do this?A. Transparent bridgingB. Cut-through switchingC. Fragment-free switchesD.
Virtual LANsE. Store-and-forward switchingF. None of the aboveAnswer: DExplanation:The creation of VLANs in a switch will provide separate Broadcast domains. By default,all ports in a Catalyst switch belong to VLAN 1. By creating additional VLANs, theLAN will be logically segmented into separate broadcast domains.Incorrect AnswersA. Transparent bridging is called Transparent because the endpoints devices do not needto know that the bridges exists. It will not play any role for creating separate broadcastdomainB, E. Both of these are switching methods.C. This has nothing to do with the creation of multiple broadcast domains.QUESTION 196:Certkiller has implemented the use of VLANs in their network.
Which of thefollowing are considered to be a benefit of VLANs? (Choose three)A. They increase the size of collision domains.B. They allow logical grouping of users by function.C. They can enhance network security,D. The increase the size of broadcast domains while decreasing the number of thebroadcast domains.E. The increase the number of broadcast domains while decreasing the size of thebroadcast domains.F.
They simplify switch administration.Answer: B, C, EExplanation:There are many motivations for using VLANs, including these:Actualtests.com - The Power of Knowing640-8021. To group users by department, or by groups that work together, instead of by physicallocation. (B)2. To reduce overhead by limiting the size of each broadcast domain (E)3. To enforce better security by keeping sensitive devices on a separate VLAN (C)4. To separate specialized traffic from mainstream traffic - for example, putting IPtelephones on a separate VLAN form user PCs.QUESTION 197:What are some of the characteristics of a typical VLAN arrangement, foundthroughout the Certkiller switched LAN? (Select all that apply)A. VLANs logically divide a switch into multiple, independent switches at Layer 2.B.
Trunk links can carry traffic for multiple VLANs.C. VLAN implementation significantly increases traffic due to added trunkinginformation.D. A VLAN can span multiple switches.E. VLANs typically increase the number of switches neededF. VLANs typically decrease the number of switches neededAnswer: A, B, DExplanation:VLANs give you the power of making virtual LAN networks to subdivide collisiondomains into smaller units of functionality, without being limited by physical location.A is correct because that is the exact function of a VLAN.
B is correct because trunklinks are used to carry traffic for multiple VLANs. D is correct because a VLAN can andoften does span across multiple switches. VTP makes this possible.Incorrect Answers:C. Although trunking information does indeed add some level of overhead, the overalltraffic overhead is greatly reduced though the use of VLANs.E, F. The number of total switches needed in a network is the result of the number ofdevices on the entire LAN that need to be connected. Whether VLANs are used or notwill have little, if any, impact on the total number of switches needed in a LAN.QUESTION 198:How could the Certkiller corporation benefit from using VLANs on their network?(Select three answer choices.)A.
VLANs allow access to network services based on department, not physical location.B. VLANs utilize packet filtering to enhance network security.C. VLANs provide a low-latency, high bandwidth internetworking alternative.D. VLANs provide a method of communication between IP addresses in large networks.Actualtests.com - The Power of Knowing640-802E. VLANs establish segmented broadcast domains in switched networks.F.
VLANs can greatly simplify adding, moving, or changing hosts on the network.Answer: A, E, FExplanation:VLANs establish broadcast domains in switched networks, so by virtue of having theoption to create many efficient broadcast domains, congestion is reduced and networkthroughput is greatly enhanced. VLANs allow networks to be divided by department orresource needs, rather then by physical location. When people move departments, leave adepartment, or join a department, administration is easy and convenient with a fewkeystrokes.Incorrect Answers:B, D. These would be router functions at layer 3.
Switches and VLANs operate at layer 2of the OSI model.C. The use of VLANs may actually increase the latency in some cases, as traffic fromone VLAN to the other will need to be routed.QUESTION 199:Two VLANs are connected to a switch as follows:In this Certkiller network segment, hosts on the same VLAN can communicate witheach other but are unable to communicate with hosts on different VLANs. What isneeded to allow communication between these two Certkiller VLANs?A. A router with subinterfaces configured on the physical interface that is connected tothe switchB. A router with an IP address on the physical interface that is connected to the switchC.
A switch with a trunk link that is configured between the switchesD. A switch with an access link that is configured between the switchesE. None of the aboveAnswer: AActualtests.com - The Power of Knowing640-802Explanation:By default, only hosts that are members of the same VLAN can communicate. To changethis and allow inter-VLAN communication, you need a router or a layer 3 switch.Here is the example of configuring the router for inter-vlan communicationRouterA(config)#int f0/0.1RouterA(config-subif)#encapsulation ?dot1Q IEEE 802.1Q Virtual LANRouterA(config-subif)#encapsulation dot1Q or isl VLAN IDRouterA(config-subif)# ip address x.x.x.x y.y.y.yQUESTION 200:You are working as a network technician at Certkiller University, when you get acall from the Engineering Faculty.
They're complaining that they're receivingobsolete information from the Business Faculty's network traffic broadcasts.What can you do to contain the Business Faculty's broadcast while still keeping itconnected to the internet and the enterprise services of the University? (Select allvalid answer choices)A. Use half and full-duplex Ethernet on the Engineering Department LANB.
Establish a VTP domain to minimize the obsolete trafficC. Change the switch IP address of the switchD. Create separate VLANs and subnets for the two departments and route between thetwoE. Provide greater bandwidth to the Engineering Department LANF. Place the business department on a separate subnet and route between networksAnswer: D, FExplanation:In order to prevent the broadcast and link level multicast traffic separated between thedepartments, they need to be isolated at layer two. This can be accomplished in twoways.
The first is to create separate VLANs and place each department into a differentone. The second method would be to separate the two departments into two completelydifferent networks, and route between them.Incorrect Answers:A. Mixing the use of half and full duplex will make no difference to the number ofbroadcasts sent.B. Trunking is only useful in networks that already contain VLANs.C.
This will make no difference, as all users will still be contained within the same IPsubnet.E. The amount of bandwidth involved will not have any impact on the amount ofbroadcasts that are sent and received.Actualtests.com - The Power of Knowing640-802QUESTION 201:Two Certkiller switches are shown below:The switches have been configured with static VLANs as shown. During testing, thenetwork administrator notices that VLAN 20 on SwitchA has no connectivity withVLAN 30 on SwitchB.
What should the network administrator do?A. Configure the interconnected ports on SwitchA and SwitchB into access mode.B. Connect the two switches with a straight-through cable.C. Add a Layer 3 device to connect VLAN 20 and VLAN 30.D. Configure the management VLAN with IP address.E. Ensure that the VIP passwords match on both switches.Answer: CExplanation:Network devices in different VLANs cannot communicate with one another without arouter to route traffic between the VLANs. In most network environments, VLANs areassociated with individual networks or subnetworks.For example, in an IP network, each subnetwork is mapped to an individual VLAN.Configuring VLANs helps control the size of the broadcast domain and keeps localtraffic local. However, when an end station in one VLAN needs to communicate with anend station in another VLAN, interVLAN communication is required.
Thiscommunication is supported by interVLAN routing. You configure one or more routersto route traffic to the appropriate destination VLAN.The diagram below shows a basic interVLAN routing topology. SwitchA is in VLAN 10and SwitchB is in VLAN20. The router has an interface in each VLAN.Basic InterVLAN Routing Topology:When HostA in VLAN10 needs to communicate with HostB in VLAN10, it sends aActualtests.com - The Power of Knowing640-802packet addressed to that host. SwitchA forwards the packet directly to HostB, withoutsending it to the router.When HostA sends a packet to HostC in VLAN20, SwitchA forwards the packet to therouter, which receives the traffic on the VLAN10 interface.
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