ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 10
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In a redundant link, if the primary link fails then thesecondary links will automatically start after few minutes. If port Fa0/9 becamedisconnected, then the packets would be re-routed automatically using theCertkiller A- Certkiller 2- Certkiller 3 path.QUESTION 79:You are logged into a router and wish to view the layer 3 information about yourneighboring Cisco routers.
What IOS command gives layer 3 information for of thedirectly connected router interfaces?A. show ip linksB. show cdp neighborC. show cdp neighbor detailD. show ip clientsE. show ip routeF. None of the aboveAnswer: CExplanation:To display detailed information about neighboring devices discovered using CiscoDiscovery Protocol (CDP), use the show cdp neighbors privileged EXEC command.Detail - (Optional) Displays detailed information about a neighbor (or neighbors)including network address, enabled protocols, hold time, and software version.Incorrect Answers:A, D. These are invalid commands.B. The "show cdp neighbor" command, without the "detail" keyword will not display theActualtests.com - The Power of Knowing640-802additional layer 3 protocol information.E.
This will show all routes from all other routers within the domain. We wish to seeinformation from just the direct interface neighbors.QUESTION 80:A Certkiller technician is troubleshooting connectivity problems between tworouters that are directly connected through the serial line. The technician noticesthat the serial line is up but cannot see any neighbors displayed in the output of theshow cdp neighbors command.In which OSI layer is the problem most likely occurring?A. PhysicalB. Data linkC. Network layerD. Transport layerE. Application layerAnswer: BExplanation:As the question states that serial line is up, it means the problem is not on the Networklayer. The administrator cannot see any output by issuing the show cdp neighborscommand. It means that CDP is disabled and CDP is a protocol that runs over Layer2(the data link layer) on all Cisco routers, bridges, access servers, and switches.QUESTION 81:While troubleshooting a network connectivity problem, a Certkiller technicianobserves steady link lights on both the workstation NIC and the switch port towhich the workstation is connected.
However, when the ping command is issuedfrom the workstation, the output message "Request timed out." is displayed. Atwhich layer of the 7-layer OSI model does the problem most likely exist?A. The data link layerB. The application layerC. The protocol layerD. The access layerE. The session layerF. The network layerG. None of the aboveAnswer: FActualtests.com - The Power of Knowing640-802Explanation:Network Layer:The Network layer (also called layer 3) manages device addressing, tracks the location ofdevices on the network, and determines the best way to move data, which means that theNetwork layer must transport traffic between devices that aren't locally attached.
Routers(layer 3 devices) are specified at the Network layer and provide the routing serviceswithin an internetwork.Request Time out, Destination Unreachable etc error comes from Network Layerproblem.QUESTION 82:A host is connected to the Certkiller network as displayed below:The two connected ports on the switch are not turning orange or green.
What wouldbe the most effective steps to troubleshoot this physical layer problem? (Choosethree)A. Ensure that the Ethernet encapsulations match on the interconnected router and switchports.B. Ensure that cables A and B are straight-through cables.C. Ensure cable A is plugged into a trunk port.D. Ensure that switch has power.E. Reboot all of the devices.F. Reseat all cables.Answer: B, D, FActualtests.com - The Power of Knowing640-802Explanation:Straight-through cables are used to connect hosts to a switch (or hub) and routers to aswitch (or hub). See the table below:Incorrect Answers:A: This would mean that there was a layer 2 issue, not layer 1.
If the problem was relatedto the encapsulation, the lights on the switch would indicate layer 1 activity.C: A trunk port is not required, and again if this was the problem the link lights on theswitch would be on.E: This should only be used as a last resort, as this will affect all users on the switch.QUESTION 83:Which line from the output of the show ip interface command indicates that there isa Layer 1 problem?A. Serial0/1 is up, line protocol is downB.
Serial0/1 is down, line protocol is downC. Serial0/1 is up, line protocol is upD. Serial0/1 is administratively down, line protocol is downE. None of the aboveAnswer: BExplanation:When the physical interface itself is down, then the problem is related to layer 1. When itis up, but the line protocol is down, then the problem is related to layer 2.Actualtests.com - The Power of Knowing640-802Reference: http://www.cisco.com/univercd/cc/td/doc/cisintwk/itg_v1/tr1915.htmQUESTION 84:At which layer of the OSI model does the protocol that provides the informationdisplayed by the "show cdp neighbors" command operate?A. TransportB. PhysicalC. ApplicationD. Data linkE.
NetworkAnswer: DExplanation:CDP is a device discovery protocol that runs over Layer 2 (the data link layer) on allCisco-manufactured devices (routers, bridges, access servers, and switches) and allowsnetwork management applications to discover Cisco devices that are neighbors of alreadyknown devices. With CDP, network management applications can learn the device typeand the Simple Network Management Protocol (SNMP) agent address of neighboringdevices running lower-layer, transparent protocols.QUESTION 85:Actualtests.com - The Power of Knowing640-802Which three of the protocols below belong to the application layer? (Select threeanswer choices)A. ARPB. HTTPSC.
SMTPD. CDPE. TFTPF. ICMPAnswer: B, C, EExplanation:The application layer is the highest OSI layer, and protocols at this layer are end-useroriented. HTTPS so people can get information on the internet, SMTP so people canmanage networks, and TFTP so people can download files.Incorrect Answers:A, D, F. ARP, CDP, ICMP are protocols that equipment like routers and switches use tocommunicate with themselves, and belong to lower levels on the model.QUESTION 86:Exhibit:A Cisco router and a Catalyst switch are connected as shown. The Certkillernetwork administrator is working on a computer that is connected to themanagement console of the switch.
In order to configure the default gateway for theswitch, the administrator needs to learn the IP address of the attached routerinterface. Which IOS command will provide this information in the absence ofLayer 3 connectivity?A. ping router_ip_addressB. show ip rarpC. ping switch_ip_addressD. show cdp neighbors detailE.
show dhcp-configF. show ip neighborsG. None of the aboveActualtests.com - The Power of Knowing640-802Answer: DExplanation:To display detailed information about neighboring devices discovered using CiscoDiscovery Protocol (CDP), use the show cdp neighbors privileged EXEC command.Detail - (Optional) Displays detailed information about a neighbor (or neighbors)including network address, enabled protocols, hold time, and software version.The following is sample output for the show cdp neighbors detail command.router#show cdp neighbors detail------------------------Device ID: lab-7206Entry address(es):IP address: 172.19.169.83Platform: cisco 7206VXR, Capabilities: RouterInterface: Ethernet0, Port ID (outgoing port): FastEthernet0/0/0Holdtime : 123 secVersion :Cisco Internetwork Operating System SoftwareIOS (tm) 5800 Software (C5800-P4-M), Version 12.1(2)Copyright (c) 1986-2002 by Cisco Systems, Inc.advertisement version: 2Duplex: halfQUESTION 87:You want to upgrade the Certkiller LAN so that all ports operate in full duplexmode.
Which statement is true about full-duplex Ethernet when comparing tohalf-duplex Ethernet?A. Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides apoint-to-point linkB. Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet usesone wire to send and receiveC. Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet ofthe same bandwidthD. Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernetuses a jam signalE. None of the aboveAnswer: CExplanation:Full-duplex Ethernet uses two pairs of wires instead of one wire pair like half duplex.And full duplex uses a point-to-point connection between the transmitter of theActualtests.com - The Power of Knowing640-802transmitting device and the receiver of the receiving device.
This means that withfull-duplex data transfer, you get a faster data transfer compared to half duplex.QUESTION 88:What are two characteristics of "store and forward" switching? (Select two answerchoices)A. Latency fluctuates regardless of frame size.B. The switch receives the complete frame before beginning to forward it.C. Latency through the switch varies with frame length.D. The switch checks the destination address upon receipt of headers.Answer: B, CExplanation:With store-and-forward, the entire frame is received by the switch before the first bit ofthe frame is forwarded.As soon as the incoming switch port receives enough of the frame to see the destinationMAC address, the forwarding decision is made and the frame is transmitted out theappropriate outgoing port to the destination device.
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