ActualTests.Cisco.640-802.Exam.Q.and.A.08.15.08-DDU (1130589), страница 18
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Hosts listen forthese network infomercials to acquire route information. A router solicitation is a requestfor immediate advertisements and may be sent by a host when it starts up.QUESTION 150:Refer to the Certkiller network segment shown below:In this network, The Certkiller manager on workstation M uses Telnet to log in tothe command line interface of routerA. The administrator wishes to discoverinformation about active workstations on the LAN attached to router A, includingtheir IP and MAC addresses. Which command will provide this information?A.
show running-configB. show hostsC. show ip arpD. show cdp neighborsE. show interfacesF. None of the aboveAnswer: CActualtests.com - The Power of Knowing640-802Explanation:ARP establishes correspondences between network addresses (an IP address, forexample) and LAN hardware addresses (Ethernet addresses). A record of eachcorrespondence is kept in a cache for a predetermined amount of time and then discarded.The following is sample output from the show ip arp command:CK1 # show ip arpProtocol Address Age(min) Hardware Addr Type InterfaceInternet 172.16.233.22 9 0000.0c59.f892 ARPA Ethernet0/0Internet 172.16.233.21 8 0000.0c07.ac00 ARPA Ethernet0/0Internet 172.16.233.19 - 0000.0c63.1300 ARPA Ethernet0/0Internet 172.16.233.30 9 0000.0c36.6965 ARPA Ethernet0/0Reference:http://www.cisco.com/en/US/products/sw/iosswrel/ps5187/products_command_reference_chapter09186a008017QUESTION 151:Exhibit:You work as a network engineer at Certkiller .com.
You study the exhibit carefully.You are told by your boss, Mrs. Certkiller, to study the interfaces of switchCertkiller 3 in particular. What can you tell her? (Select two)A. A hub is connected directly to FastEthernet0/5.B. FastEthernet0/1 is connected to a host with multiple network interface cards.C. Interface FastEthernet0/2 has been disabled.D. Multiple devices are connected directly to FastEthernet0/1.E. FastEthernet0/1 is configured as a trunk link.F. FastEthernet0/5 has statically assigned MAC addresses.Actualtests.com - The Power of Knowing640-802Answer: A, EExplanation:Based on the output shown, there are multiple MAC addresses from different VLANsattached to the FastEthernet 0/1 interface.
Only trunks are able to pass information fromdevices in multiple VLANs.QUESTION 152:DRAG DROPYou work as a network administrator at a Certkiller office.Your boss, Mrs. Certkiller, is interested in the CLI commands. Match thecommands with the appropriate functions. Not all options are used.Actualtests.com - The Power of Knowing640-802Answer:QUESTION 153:While troubleshooting an issue in the Certkiller LAN you notice that a networkinterface port has collision detection and carrier sensing enabled on a sharedtwisted pair network. From this statement, what is known about the networkinterface port?A.
This is an Ethernet port operating at half duplexB. This is an Ethernet port operating at full duplexC. This is a port on a network interface card in a PCD. This is 10 MB/s switch portE. This is a 100 MB/s switch portF. None of the aboveAnswer: AExplanation:Half-duplex Ethernet is defined in the original 802.3 Ethernet; Cisco says it uses only onewire pair with a digital signal running in both directions on the wire.It also uses the CSMA/CD protocol to help prevent collisions and to permitActualtests.com - The Power of Knowing640-802retransmitting if a collision does occur.
If a hub is attached to a switch, it must operate inhalf-duplex mode because the end stations must be able to detect collisions. Half-duplexEthernet-typically 10BaseT-is only about 30 to 40 percent efficient as Cisco sees itbecause a large 10BaseT network will usually only give you 3 to 4Mbps, at mostQUESTION 154:When a switch port is used as a VLAN trunk, which of the following trunk modesare valid? (Select all that apply.)A. BlockingB.
AutoC. DesirableD. OnE. TransparentF. LearningAnswer: B, C, DExplanation:A trunk port can be configured as one of the following 5 different modes: on, off,desirable, auto, or nonegotiate.Actualtests.com - The Power of Knowing640-802The table below is a summary of the configuration modes.QUESTION 155:Which of following VLAN frame encapsulation types are configurable on a Ciscoswitch? (Select two answer choices.)A. VTPB. 802.1QC. LLCD. ISLE.
CDPF. PAPAnswer: B, DExplanation:ISL and 802.1Q are the two trunking encapsulations that can be configured on a Ciscoswitch. ISL is Cisco proprietary and 802.1Q is the IEEE standard method.Incorrect Answers:Actualtests.com - The Power of Knowing640-802A. VTP is the VLAN Trunking Protocol, which is used to carry VLAN informationacross the trunks. The question is asking for the encapsulation options for the trunk,which will be used by VTP.C. LLC is the Logical Link Control, which is a sub-layer of the data link layer.E. CDP is the Cisco Discovery Protocol, which is used by Cisco devices to discoverinformation on neighboring Cisco devices.F. PAP is the Password Authentication Protocol, which is used as an authenticationmechanism on PPP links.QUESTION 156:Certkiller users have noticed extremely slow network performance, intermittentconnectivity, and connection losses.
After entering the "show interfaces" command,you notice that the Ethernet interface is configured as 100 Mbps full-duplex andthat there is evidence of late collisions. What could be the cause of this problem?A. Duplex mismatchB. A routing loopC. Trunking mode mismatchD. Improperly configured root bridgeE. Improperly configured static VLANF. None of the aboveAnswer: AExplanation:A duplex mismatch may result in performance issues, intermittent connectivity, and lossof communication.
When troubleshooting NIC issues, verify that the NIC and switch areusing a valid configuration. Some third-party NIC cards may fall back to half-duplexoperation mode, even though both the switchport and NIC configuration have beenmanually configured for 100 Mbps, full-duplex.
This behavior is due to the fact that NICautonegotiation link detection is still operating when the NIC has been manuallyconfigured. This causes duplex inconsistency between the switchport and the NIC.Symptoms include poor port performance and frame check sequence (FCS) errors thatincrement on the switchport. To troubleshoot this issue, try manually configuring theswitchport to 100 Mbps, half-duplex.
If this action resolves the connectivityproblems,you may be running into this NIC issue. Try updating to the latest drivers foryour NIC, or contact your NIC card vendor for additional support.Reference:http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800a7af0.shtmlQUESTION 157:Actualtests.com - The Power of Knowing640-802You are experiencing intermittent issues relating to congestion within the Certkillernetwork.
What are the possible causes of congestion on this LAN? (Choose all thatapply)A. A broadcast domain with too many hosts.B. Full duplex operation.C. Broadcast storms.D. Multicasting.E. Network Segmentation.F. Low bandwidth.Answer: A, C, FExplanation:A LAN segment with too many hosts can mean that there are a large number of stationscontending for bandwidth. It can also mean an increase in the number of collisions on thesegment, which can cause further congestion issues.
Broadcast storms are the result of alarge number of broadcasts sent over the LAN. Because each station listens to thesebroadcast messages, congestion can occur quickly. Finally, low bandwidth can simplymean that the LAN can not process all of the LAN traffic that is being sent. This canmean that TCP sessions are retransmitted, which can lead to additional congestion.Incorrect Answers:B. This can alleviate congestion, as data can be sent and received at the same time.
Inaddition, collisions are not possible in a full duplex LAN.D. Multicasting can actually alleviate congestion issues, as single streams of informationcan reach multiple hosts at the same time, instead of using a series of point to pointconnections.E. Segmentation breaks up a large LAN into multiple, smaller LANS. This will meanfewer hosts per broadcast domain.QUESTION 158:Exhibit:Refer to the graphic. A Certkiller host is connected to switch port Fa0/3 with acrossover cable. The host and switch have been fully configured for IP connectivityActualtests.com - The Power of Knowing640-802as shown. However, the port indicator on switch port Fa0/3 is not on, and the hostcan not communicate with any other hosts including those connected to VLAN 2 onthe same switch.
Based on the information given, what is the problem?A. Switch port Fa0/3 is not configured as a trunk port.B. The cable is the wrong type.C. The switch has been assigned an incorrect subnet mask.D. Switch port Fa0/3 has been blocked by STP.E. The switch and the hosts must be in the same subnet.Answer: BExplanation:To connect two different devices, we use straight-through cables. In the scenario, a hostis connected to a switch with a cross-over cable, so there will be no communicationbetween them.
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