ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 7
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Destination MAC: 0011.43da.2c98Source MAC: 00b0.d0ef.5f6aDestination IP: 192.168.60.5Source IP: 192.168.24.5D. Destination MAC: 0011.43da.2c98Source MAC: 0070.0e97.af4eDestination IP: 192.168.60.5Source IP: 192.168.60.2E. 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. 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 3.Actualtests.com - The Power of Knowing640-802QUESTION 59:Exhibit #1:Exhibit #2:Please study the two exhibits carefully.The partial frame shown above displays select header information as it arrives atthe destination host.
Of the following choices shown below, which one represents thecorrect header information in the responding frame returned to the remote host?A. AB. BC. CD. DE. EAnswer: AActualtests.com - The Power of Knowing640-802QUESTION 60:The Certkiller network is shown below:Based on the diagram above, which destination addresses will Host A use to senddata to Host B? (Choose two.)A.
The IP address of Certkiller 1B. The IP address of Certkiller A Fa0/0C. The IP address of Host BD. The MAC address of Certkiller 1E. The MAC address of Certkiller A Fa0/0F. The MAC address of Host BAnswer: C, EExplanation:When sending data from one host to another, destination information will be added toevery packet's header. The destination information will be the IP and MAC Address ofdestination host.
If the destination is found outside the subnet the MAC address of therouter is used. Note: The destination IP address will never change, unless NAT isinvolved.QUESTION 61:Which IOS user EXEC command will allow a network technician to determinewhich router in the path to an unreachable network host should be examined moreclosely for the cause of the network failure?A. Certkiller B> telnetActualtests.com - The Power of Knowing640-802B.
Certkiller B > pingC. Certkiller B > traceD. Certkiller B > show ip routeE. Certkiller B > show interfaceF. Certkiller B > show cdp neighborsAnswer: CExplanation:This can perform the trace command. It sends the ping packets to each of the routers onthe way to the receiver. The router which doesn't respond will be a potential failure placein this network.QUESTION 62:A Certkiller office's network topology is shown in the diagram below:Host Certkiller A needs to communications with the e-mail server shown above.What address will be placed on the destination address field of the frame when itleaves host Certkiller A?A.
The MAC address of Certkiller AB. The MAC address of switch Certkiller 1C. The MAC address of the E0 interface of the Certkiller 3 router.D. The MAC address of the E1 interface of the Certkiller 3 router.E. The MAC address of switch Certkiller 2F. The MAC address of the email serverAnswer: CExplanation:If the destination host is in the remote segment than the router will change the MACaddress of the source to its own. The inverse ARP protocol is by default on. RememberActualtests.com - The Power of Knowing640-802that IP address is not changed after forwarding. The MAC address is changed aftercrossing each broadcast domain.QUESTION 63:The Certkiller network topology is shown below:You work as a network engineer at Certkiller .com.
The topology of theCertkiller .com network is displayed in the exhibit. Host Certkiller 1 has established aconnection with the HTTP server attached to interface E0 of the Certkiller B router.Which of the following statements describe the information contained in protocoldata units sent from host Certkiller 1 to this server? (Select three)A.
The destination port number in a segment header will have a value of 80.B. The destination port number in a segment header will have a unique value greater thanor equal to 1023.C. The destination address of a frame will be the MAC address of the HTTP serverinterface.D. The destination address of a frame will be the MAC address of the E0 interface of theCertkiller A router.E. The destination IP address of a packet will be the IP address of the E0 interface of theCertkiller A router.F. The destination address of a packet will be the IP address of the HTTP-ServerAnswer: A, D, FExplanation:HTTP uses TCP port 80, making choice A correct.
The source port will be chosenrandomly, but not the destination TCP port. The destination IP address will be leftunchanged, and since HTTP server is on a remote network, the destination MAC addresswill be the MAC address of the default gateway ( E0 on Certkiller A).QUESTION 64:Actualtests.com - The Power of Knowing640-802The Certkiller network is shown below:In this network, host Certkiller 1 is able to send data to Host Certkiller 2.
How willRouter Certkiller D handle the data frame received from Host Certkiller 1? (Choosethree)A. Router Certkiller D will strip off the source MAC address and replace it with the MACaddress on the forwarding Fast Ethernet interfaceB. Router Certkiller D will strip off the source IP address and replace it with the IPaddress on the forwarding Fast Ethernet interfaceC. Router Certkiller D will strip off the destination MAC address and replace it with theMAC address of Host Certkiller 2D. Router Certkiller D will strip off the destination IP address and replace it with the IPaddress of Host BE.
Router Certkiller D will forward the data frame out interface Fast Ethernet0/1F. Router Certkiller D will forward the data frame out interface FastEthernet0/2Answer: A, C, FExplanation: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. Afterreceiving 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 MACActualtests.com - The Power of Knowing640-802header and examines the network-layer header to determine what to do with the packet.2. Examine the age of the packet. The router must ensure that the packet has not cometoo far to be forwarded. For example, IPX headers contain a hop count. By default, 15hops is the maximum number of hops (or routers) that a packet can cross. If a packet hasa hop count of 15, the router discards the packet.IP headers contain a Time to Live (TTL) value. Unlike the IPX hop count, whichincrements as the packet is forwarded through each router, the IP TTL value decrementsas the IP packet is forwarded through each router.
If an IP packet has a TTL value of 1,the router discards the packet. A router cannot decrement the TTL value to 1 and thenforward the packet.3. Determine the route to the destination. Routers maintain a routing table that listsavailable networks, the direction to the desired network (the outgoing interface number),and the distance to those networks. After determining which direction to forward thepacket, the router must build a new header.
(If you want to read the IP routing tables on aWindows 95/98 workstation, type ROUTE PRINT in the DOS box.)4. Build the new MAC header and forward the packet.Finally, the router builds a new MAC header for the packet. The MAC header includesthe router's MAC address and the final destination's MAC address or the MAC address ofthe next router in the path.Figure 5 shows the contents of a packet before and after it has been forwarded by arouter. Figure 5 also shows the contents of the router's routing tables.Actualtests.com - The Power of Knowing640-802Figure 5: Routers forward packets based on the network address.QUESTION 65:Two Certkiller hosts are shown below:Refer to the exhibit above.
Host A is communicating with host B. How will the databe addressed when it leaves host A?A. Source MAC=000A.8A47.E612Destination MAC=000B.DC04.12F4Source IP=192.168.23.4Destination IP=192.168.23.1Actualtests.com - The Power of Knowing640-802B. Source MAC=000A.8A47.E612Destination MAC=0010.7BE7.FAEFSource IP=192.168.23.4Destination IP=192.168.127.7C. Source MAC=000A.8A47.E612Destination MAC=000B.DC04.12F4Source IP=192.168.23.4Destination IP=192.168.127.7D.
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