ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 8
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Source MAC=000A.8A47.E612Destination MAC=0010.7BE7.FAEFSource IP=192.168.23.4Destination IP=192.168.23.1E. None of the aboveAnswer: BExplanation:When packets leave from the host, the packets contains the source MAC and IP of thehost address. The source and destination IP address will not change (if it did, the routerdevices would not know where to send the data). Because the host knows that thedestination is on another subnet, it will forward the packet to the default gateway device,so the destination MAC address will be of the default gateway, which is the LANinterface of router Certkiller 1.QUESTION 66:Exhibit:Please study the exhibit above carefully.
If host Certkiller A sends an IP packet tohost Certkiller B, what will the OSI Layer 3 source address be in the packet when itreaches host B?A. B2:B2:B2:B2:B2:B2B. A1:A1:A1:A1:A1:A1C. 10.168.10.99D. 10.168.11.65E. C3:C3:C3:C3:C3:C3Actualtests.com - The Power of Knowing640-802F. 10.168.11.88G. None of the aboveAnswer: CExplanation:When packets transfer from one host to another across a routed segment, the source IPaddress always remains the same source IP address, and the physical (MAC) address willbe the existing router's interface address. Similarly, the destination IP address alwaysremains the same and the destination physical (MAC) address is the destination router'sinterface address.QUESTION 67:Exhibit:Please study the exhibit carefully.
If host Certkiller A sends an IP packet to hostCertkiller B, what will the source physical (MAC) address be in the frame when itreaches host Certkiller B?A. A1:A1:A1:A1:A1:A1B. D4:D4:D4:D4:D4:D4C. B2:B2:B2:B2:B2:B2D. 10.168.11.88E. 10.168.10.99F. C3:C3:C3:C3:C3:C3Answer: FExplanation:When packets transfer from one host to another across a routed segment, the source IPaddress always remains the same source IP address, and the source physical (MAC)address will be the existing router's interface address.
Similarly, the destination IPaddress always remains the same and the destination physical (MAC) address is thedestination router's interface address.QUESTION 68:Actualtests.com - The Power of Knowing640-802In the network below, host Certkiller A is transferring a file to the FTP server. PointA represents the frame as it goes toward the Certkiller 1 router. What will the Layer2 destination address be at this point?A.
192.168.7.17B. abcd.1123.0045C. aabb.555.2222D. 192.168.1.1E. abcd.2246.0035Answer: EExplanation:For packets destined to a host on another IP network, the destination MAC address willbe the LAN interface of the router. Since the FTP server lies on a different network, thehost will know to send the frame to it's default gateway, which is Certkiller 1.QUESTION 69:Part of the Certkiller network is shown below:Host Certkiller 1 needs to communicate with the email server shown above.
Whataddress will be placed in the destination address field of the frame when it leavesHost Certkiller 1?Actualtests.com - The Power of Knowing640-802A. The MAC address of Host Certkiller 1B. The MAC address of E0 of the router Certkiller CC. The MAC address of Switch Certkiller BD. The MAC address of E1 of the router Certkiller CE.
The MAC address of Switch Certkiller AF. The MAC address of the email server Certkiller DG. None of the aboveAnswer: BExplanation:Since the email server resides on a different IP subnet than the host Certkiller 1, the hostwill send the frame to its default gateway.
In this case, the router Certkiller C is acting asthe default gateway for all hosts on the LAN, so the frame will be sent to its Ethernetinterface so that it can be routed to the email server.QUESTION 70:Part of the Certkiller network is shown below:In this Certkiller network segment, host Certkiller A needs to send data to HostCertkiller B.
Which Layer 2 and Layer 3 destination addresses will be used in thissession to send the data from Host Certkiller A to Host Certkiller B?A. 192.168.60.5 and 0007.0e56.ab2eB. 192.168.24.2 and 0007.0e84.acefC. 192.168.24.1 and 0007.0e56.ab2eD.
192.168.60.5 and 0011.43da.2c98E. None of the aboveAnswer: AExplanation:When packets leave from the host, the packets contains the source MAC and IP of theActualtests.com - The Power of Knowing640-802host address. The source and destination IP address will not change. Because the hostknows that the destination is on another subnet, it will forward the packet to the defaultgateway device, so the destination MAC address will be of the default gateway, which isthe FA0/0 interface of router Certkiller 2.QUESTION 71:Part of the Certkiller network is shown below:In this network segment, host Certkiller A sends data to Host Certkiller B.
As packetstravel from host Certkiller A to host Certkiller B, which three devices will use thedestination MAC address of the packet to determine a forwarding path? (Choosethree)A. Hub Certkiller 0B. Switch Certkiller 1C. Router Certkiller 5D. Router Certkiller 4E. Switch Certkiller 2F. Switch Certkiller 3Answer: B, E, FExplanation:Switches use the destination MAC address information for forwarding traffic, whilerouters use the destination IP address information.Local Area Networks employ Layer 2 Switches and Bridges to forward and filternetwork traffic.
Switches and Bridges operate at the Data Link Layer of the Open SystemInterconnect Model (OSI). Since Switches and Bridges operate at the Layer 2 theyoperate more intelligently than hubs, which work at Layer 1 (Physical Layer) of the OSI.Because the switches and bridges are able to listen to the traffic on the wire to examinethe source and destination MAC address.
Being able to listen to the traffic also allows theswitches and bridges to compile a MAC address table to better filter and forward networktraffic.To accomplish the above functions switches and bridges carry out the following tasks:1. MAC address learning by a switch or a bridge is accomplished by the same method.Actualtests.com - The Power of Knowing640-802The switch or bridge listens to each device connected to each of its ports and scan theincoming frame for the source MAC address. This creates a MAC address to port mapthat is cataloged in the switches/bridge MAC database.
Another name for the MACaddress table is content addressable memory orCAM table.2. When a switch or bridge is listening o the network traffic, it receives each frame andcompares it to the MAC address table. By checking the MAC table the switch/ bridge areable o determine which port the frame came in on. If the frame is on the MAC table theframe is filtered or transmitted on only that port. If the switch determines that the frameis not on the MAC table, the frame is forwarded out to all ports except the incoming port.QUESTION 72:Exhibit:You work as a network technician at Certkiller .com. Please study the exhibitcarefully.
Host Certkiller A is communicating with the server. What will be thesource MAC address of the frames received by Host Certkiller A from the Certkiller Bserver?A. The MAC address of Certkiller 2 router interface e1B. The MAC address of Certkiller 2 router interface e0C. The MAC address of the Certkiller B server network interfaceD.
The MAC address of host Certkiller AE. None of the aboveAnswer: BExplanation:Whereas switches can only examine and forward packets based on the contents of theMAC header, routers can look further into the packet to discover the network for which apacket is destined. Routers make forwarding decisions based on the packet'snetwork-layer header (such as an IPX header or IP header). These network-layer headerscontain source and destination network addresses.Local devices address packets to the router's MAC address in the MAC header. AfterActualtests.com - The Power of Knowing640-802receiving the packets, the router must perform the following steps:1.
Check the incoming packet for corruption, and remove the MAC header . Therouter checks the packet for MAC-layer errors. The router then strips off the MACheader and examines the network-layer header to determine what to do with the packet.2.
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