ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 11
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So, each frame might experienceslightly less latency. Store and forward switching may add latency when compared toother switching methods such as cut through, but it can reduce the amount of errors thatbecome forwarded through a network.Reference:CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN1-58720-094-5) Page 243Incorrect Answers:A. The amount of latency that is introduced with this method of switching is dependenton the size of the frame, as the switch must wait to receive the entire frame beforesending it.D. The switch must wait for the entire frame before forwarding it on, and not just theheaders.QUESTION 89:Split horizon has been enabled within the Certkiller routed network.
Which one ofthe following statements best explains the split horizon rule?A. Only routers can split boundaries (horizons) between networks in separate ASnumbers.B. Each AS must keep routing tables converged to prevent dead routes from beingadvertised across boundaries.Actualtests.com - The Power of Knowing640-802C. Once a route is received on an interface, advertise that route as unreachable back outthe same interface.D. Information about a route should never be sent back in the direction from which theoriginal update came.E. None of the aboveAnswer: DExplanation:The split horizon rule states:* Never advertise a route out of the interface through which you learned it.For instance, in Figure 4a below, if Router One is connected to Routers Two and Threethrough a single multipoint interface (such as Frame Relay), and Router One learnedabout Network A from Router Two, it will not advertise the route to Network A back outthe same interface to Router Three.
Router one assumes that Router Three would learnabout Network A directly from Router Two.Incorrect Answers:A: There is no such requirementB: Distance vector protocols updates routing table at regular intervals instead ofTopology changesC: This is the definition of the poison reverse rule, not the split horizon rule.Reference: Wendell Odom. CISCO CCNA Certification Guide (2000 Press) Page 369.QUESTION 90:Which of the following commands would be applied to a WAN interface, but not onLAN Interface? (Choose all that apply)A. IP addressB.
encapsulation PPPC. no shutdownD. authentication CHAPE. SpeedF. None of the aboveAnswer: B, DActualtests.com - The Power of Knowing640-802Explanation:PPP encapsulation can be used in ISDN interfaces, Asynchronous serial interfaces, andpoint to point serial WAN connections. PPP is not an option for LAN interfaces. CHAPauthentication is a PPP 3 way authentication method. CHAP authentication can only beused on PPP encapsulated interfaces and is not a LAN interface configuration option.Incorrect Answers:A, C. This command can be applied to both LAN and WAN interface types.E.
The speed command is used on LAN interfaces, and is not used on WAN interfacetypes.QUESTION 91:Part of the Certkiller network is shown below:Based on the diagram shown above, what kind of cable should be used to make eachconnection that is identified by the numbers shown?A. 1 - Ethernet crossover cable2 - Ethernet straight-through cable3 - fiber optic cable4 - rollover cableB. 1 - Ethernet rollover cable2 - Ethernet crossover cable3 - serial cable4 - null modem cableC. 1 - Ethernet straight-through cable2 - Ethernet straight-through cable3 - serial cable4 - rollover cableD. 1 - Ethernet straight-through cable2 - Ethernet crossover cable3 - serial cable4 - rollover cableE.
1 - Ethernet straight-through cable2 - Ethernet crossover cableActualtests.com - The Power of Knowing640-8023 - serial cable4 - Ethernet straight-through cableAnswer: CExplanation:When connecting other devices to a switch, such as a router or workstations, a straightthrough cable is used. The only exception to this rule is when you are connecting anotherswitch to a switch, in which case a cross over cable should be used.For a serial connection to another router or to a WAN, a serial cable should be used.Finally, when connecting directly to the console port of a Cisco device, a rollover cableshould be used. This cable is also commonly referred to as a console cable.QUESTION 92:What kind of cable should be used to establish a trunked line between two Catalystswitches?A. A straight-through cableB.
An EIA/TIA-232 serial cableC. An auxiliary cableD. A modem cableE. A cross-over cableAnswer: EExplanation:A crossover cable is used to connect two of the same device types, or devices from thesame OSI layer.QUESTION 93:The Certkiller network Topology is displayed in the exhibit below:Actualtests.com - The Power of Knowing640-802A switch has been configured for three different VLANs: VLAN 2, VLAN 3, andVLAN 4. For the purposes of communication between VLANs a router is to beadded. Host from one VLAN should be able to reach the hosts in the other VLANs.Based on this requirement, what type of connection is acceptable between the routerand switch?A.
10 Mbps EthernetB. 56 kbps serialC. 100 Mbps EthernetD. 1,544 Mbps serialE. 1000 Mbps EthernetAnswer: C, EExplanation:For all hosts to be able to reach each other, inter-VLAN routing will need to beconfigured. In order to provide Inter-VLAN routing between the router and the switch, atrunk will need to be set up. This trunk can be either ISL or 802.1Q. On a router, theinterface that is to be used as the trunk can be 100 Mbps Ethernet, Gigabit Ethernet, or 10Gigabit Ethernet.
Therefore, only choices C or E are correct.QUESTION 94:Part of the Certkiller LAN is shown below:Actualtests.com - The Power of Knowing640-802Based on the diagram shown above, which set of terms correctly identifies the cabletypes shown in the exhibit? (Assume that none of the switches are set toautoconfigure)A. A: straight-throughB: straight-throughC: rolloverB.
A: crossoverB: crossoverC: rolloverC. A: crossoverB: straight-throughC: straight-throughD. A: crossoverB: straight-throughC: rolloverE. A: straight-throughB: crossoverC: rolloverAnswer: DExplanation:Crossover Cables are Used to Connect :Host to Host (Peer to Peer) NetworkingSwitch to SwitchHub to HubComputer to Router's Ethernet PortStraight through Cable:Host to SwitchHost to HubSwitch to RouterSerial Cable:Router's Serial Port to Serial PortRollover Cable :To connect Router/Switch Console port.Here one switch is connected with another switch using a crossover cable.
The switchActualtests.com - The Power of Knowing640-802connected with the router uses a straight through cable and the PC Connects to therouter's console port using the console rollover cable.QUESTION 95:The Certkiller network administrator is connecting PC hosts Certkiller A andCertkiller B directly through their Ethernet interfaces as shown in the graphic. Pingattempts between the hosts are unsuccessful. What can be done to provideconnectivity between the hosts? (Choose two.)A.
The subnet masks should be set to 255.255.255.0.B. The hosts must be reconfigured to use private IP addresses for direct connections ofthis type.C. A default gateway needs to be set on each host.D. A rollover cable should be used in place of the straight-through cableE. A crossover cable should be used in place of the straight-through cable.F. The subnet masks should be set to 255.255.255.192.Answer: A, EExplanation:This problem is due to the misconfiguration of subnet mask as well as the fact that astraight-through cable is used to connect the two devices. To ensure connectivity, thecorrect subnet mask needs to be used so that the two devices are in the same subnet andwhen connecting two PC's back to back a crossover cable should be used.QUESTION 96:Assuming you build networks to exact specifications, what is the recommendedmaximum length a 10BaseT cable can be before it has to be segmented or repeated?A.
100 metersB. 100 feetC. 100 yardsD. 200 metersE. None of the aboveAnswer: AActualtests.com - The Power of Knowing640-802Explanation:The distance standards are in meters and 10BaseT has a distance restriction of 100meters. If you go further then that, you compromise data integrity. 10BastT is thepredominant cable type used in Ethernet networks.QUESTION 97:Exhibit:You need to connect the network devices in a new Certkiller office. What types ofcables should you use to make the connections that are shown?A.A-rolloverB-straight-throughC-straight-throughD-rolloverE-crossoverB.A-straight-throughB-straight-throughC-rolloverD-straight-throughE-straight-throughC.A-straight-throughB-crossoverC-rolloverD-straight-throughE-straight-throughD.A-crossoverB-straight-throughC-crossoverD-straight-throughActualtests.com - The Power of Knowing640-802E-crossoverE.A-crossoverB-straight-throughC-rolloverD-straight-throughE-straight-throughAnswer: EExplanation:Crossover Cables are Used to Connect :Host to Host (Peer to Peer) NetworkingSwitch to SwitchHub to HubComputer to Router's Ethernet PortStraight through Cable:Host to SwitchHost to HubSwitch to RouterSerial Cable:Router's Serial Port to Serial PortRollover Cable :To connect Router/Switch Console port.QUESTION 98:Exhibit:Host Certkiller A has just been added to the network.
Which type of cable should beused between Switch Certkiller 2 and host Certkiller A?Actualtests.com - The Power of Knowing640-802A. Crossover cableB. Rollover cableC. Straight-through cableD. Console cableE. Fiber optic cableF. None of the aboveAnswer: CExplanation:Straight-through cables are used to connect hosts to a switch (or hub) and routers to aswitch (or hub). See the table below:QUESTION 99:The Certkiller LAN is upgrading all devices to operate in full duplex. Whichstatement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?A. Full-duplex Ethernet uses two wires to send and receive.
Half-duplex Ethernet usesone wire to send and receiveB. Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernetprovides a point-to-point linkC. Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet ofthe same bandwidthD.
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