ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 15
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A designated port will be marked as a forwarding port.QUESTION 122:The Certkiller network administrator needs to a switch named CK1 to become theroot bridge for a redundant path switched network. What can be done to ensurethat CK1 will always assume the role as the root bridge?A. Assign the switch a higher MAC address than the other switches in the network haveB. Establish a direct link from the switch to all other switches in the networkC. Configure the switch full-duplex operation and configure the other switches forhalf-duplex operationD. Configure the switch so that it has lower priority than other switches in the networkE. None of the aboveAnswer: DExplanation:Switch having lowest bridge ID will become the root bridge.
The bridge ID is how STPkeeps track of all the switches in the network. It is determined by a combination of thebridge priority (32,768 by default on all Cisco switches) and the base MAC address. Thebridge with the lowest bridge ID becomes the root bridge in the network. To elect thedesired switch as a root bridge, set the bridge priority lowest than other switch.QUESTION 123:Four Certkiller PCs connect to a single switch as shown below:Actualtests.com - The Power of Knowing640-802In the Certkiller network shown above, switch Certkiller 1 has just been restarted andhas passed the POST routine. Host Certkiller A (the one on the left) sends its initialframe to Host Certkiller C.
What is the first thing the switch will do as regards topopulating the switching table?A. Switch Certkiller 1 will add 192.168.23.12 to the switching tableB. Switch Certkiller 1 will add 192.168.23.4 to the switching tableC. Switch Certkiller 1 will add 000B.DB95.2EE9 to the switching tableD. Switch Certkiller 1 will add 000A.8A47.E612 to the switching tableE. None of the aboveAnswer: DQUESTION 124:CK1 is a switch in the Certkiller network.
Why will CK1 never learn the broadcastaddress?A. Broadcast frames are never sent to switchesB. A broadcast frame is never forwarded by a switchC. Broadcasts only use network layer addressingD. A broadcast address will never be the source address of a frameE. Broadcast addresses use an incorrect format for the switching tableF. None of the aboveAnswer: DExplanation:There are three different address types:* Unicast : One source to One destination* Broadcast: One source to multiple destination* Multicast: One source to multiple destination joined to groupOn unicast or broadcast or multicast communication, the source address is always theunicast address but the destination address can be unicast, broadcast or multicast.Actualtests.com - The Power of Knowing640-802QUESTION 125:DRAG DROPYou work as a network technician at Certkiller .com.
Your boss, Mrs. Certkiller, isinterested in basic switch configurations. Match the IOS command with theappropriate purpose.Answer:Actualtests.com - The Power of Knowing640-802Explanation:enable : This command is used to enter into User Privileges Modeconfigure terminal: This command is used to enter into global configuration modehostname : This command is used to set the hostname of switchip default-gateway : This command should enter should enter on global configurationmode to set default gateway of switch.Interface vlan 1: Enters into the vlan 1 SVI (Switched Virtual Interface) configuration mode, where youcan enter vlan 1 SVI interface specific configurationip add x.x.x.x y.y.y.y : Use to assign the ip address on interfaceno shutdown: Brings the interface on up state from administratively down stateQUESTION 126:A Certkiller LAN is displayed in the diagram below:Host Certkiller B sends a frame to host Certkiller C.Actualtests.com - The Power of Knowing640-802What will the switch do with the frame?A.
Drop the frameB. Send the frame out all ports except port 0/2C. Return the frame to host Certkiller BD. Send an ARP request for host Certkiller CE. Send an ICMP Host Unreachable message to Host Certkiller BF. Record the destination MAC address in the switching table and send the frame directlyto Host Certkiller CAnswer: BExplanation:QUESTION 127:The following was seen on a Certkiller switch.Certkiller 1 receives the frame with the addressing shown. According to thecommand output shown in the exhibit, how will Certkiller 1 handle this frame?Actualtests.com - The Power of Knowing640-802A.
It will forward the frame out port Fa0/3 only.B. It will drop the frame.C. It will flood the frame out all ports except Fa0/3.D. It will flood the frame out all ports.Answer: CExplanation:Switches learn the MAC addresses of PCs or workstation the are connected to theirswitch ports by examining the source address of frames that are received on that port.Machines may have been removed from a port ,turned off, or moved to another port onthe same switch or a different switch.This could cause confusion in frame forwardingthe MAC address entry is automatically discard or ages out after 300 secondsif there is not MAC address of destination host in MAC table, switch sends broadcastto all ports except the source to find out the destination host.In the output there is no MAC address of the given host so the switch will flood to allports except the source port, which is port fa 0/3.QUESTION 128:Refer to the topology and MAC address table shown in the exhibit:Host Certkiller A sends a data frame to host Certkiller D.
What will the Certkiller 1switch do when it receives the frame from host A?A. The Certkiller 1 switch will flood the frame out of all ports except for port Fa0/3.B. The Certkiller 1 switch will discard the frame and send an error message back to hostCertkiller A.C. The Certkiller 1 switch will add the destination address of the frame to the MACaddress table and forward the frame to host D.D. The Certkiller 1 switch will add the source address and port to the MAC address tableand forward the frame to host Certkiller D.E.
None of the aboveAnswer: DExplanation:When switch receives the data frame from the host not having the MAC address alreadyActualtests.com - The Power of Knowing640-802in the MAC table, it will add the MAC address to the source port on the MAC addresstable and sends the data frame.
If the switch already has the MAC address in it's table forthe destination, as it is in this case, it will forward the frame directly to the destinationport. If it was not already in it's MAC table, then they frame would have been flooded outall ports except for the port that it came from.QUESTION 129:Switch Certkiller A receives the frame with the addressing shown in the exhibit.According to the command output also shown in the exhibit, how will SwitchCertkiller A handle this frame?A. It will flood the frame out all ports except Fa0/3.B.
It will forward the frame out port Fa0/3 only.C. It will flood the frame out all ports.D. It will forward the frame out port Fa0/6 only.E. It will drop the frame.F. None of the aboveAnswer: DExplanation:When frame receives the frame, it checks the source address on MAC table if MACaddress found in MAC table it tries to forward if not in MAC table adds the Address onMAC table. After checking the source address, it checks the destination address on MACtable, if MAC address found on MAC table it forwards to proper ports otherwise floodson all ports except the source port.
In this case, the MAC address shown is already in thetable so it will be forwarded directly.QUESTION 130:Please study the exhibit shown below carefully.Actualtests.com - The Power of Knowing640-802Why does the switch have two MAC addresses assigned to the FastEthernet 0/1 portin the switch address table?A. Either Host3 or Host4 has just had the NIC replaced.B. Data from Host3 and Host4 has been received by switch port FastEthernet 0/1.C. Host3 and Host4 are on two different VLANs.D. Data from two of the devices connected to the switch has been sent to Host3.E. None of the aboveAnswer: BExplanation:Switches learn the MAC addresses of PCs or workstations that are connected to theirswitch ports by examining the source address of frames that are received on that port.When more than one device is attached to a switch port, such as via the use of a hub asshown in this example, the switch will retain the MAC address of each of the knowndevices on that port.QUESTION 131:The system LED is amber on a new Certkiller Catalyst 2950 series switch.
What doesthis indicate?A. The system is powered up and operational.B. The system is sensing excessive collisions.C. The system is forwarding traffic.D. The system is not powered up.E. The system is malfunctioning.F. None of the aboveAnswer: EActualtests.com - The Power of Knowing640-802Explanation:While the switch powers on, it begins POST, a series of tests. POST runs automaticallyto verify that the switch functions properly. When the switch begins POST, the systemLED is off. If POST completes successfully, the LED turns green.
If POST fails, the LEDturns amber.Note: POST failures are usually fatal. Call Cisco Systems if your switch does not passPOST.QUESTION 132:Some of the older Certkiller switches store the entire frame before forwarding it tothe destination. What are two effects on network performance of configuring aswitch to do this? (Choose two)A. Filtering of collision fragments onlyB. Decreased latencyC. Increased latencyD. Filtering of all frame errorsE. Increase in switch operating speedF.
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