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试卷名称:思科认证640-802模拟试卷29

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Refer to the exhibit． Why is flash memory erased prior to upgrading the IOS image from the TFTP server?

A．The router cannot verify that the Cisco IOS image currently in flash is valid．

B．Flash memory on Cisco routers can contain only a single IOS image．

C．Erasing current flash content is requested during the copy dialog．

D．In order for the router to use the new image as the default, it must be the only IOS image in flash．

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Refer to the exhibit． Why does RouterA show multiple unequal cost paths to network 192．168．81．0/24? [*] A variance was configured for EIGRP autonomous system 109． The EIGRP topology table displays all routes to a destination． The EIGRP topology table shows only backup routes to a destination． Multiple floating static routes were configured to network 192．168．81．0 via interface Serial0．

Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet? Full-duplex Ethernet consists of a shared cable segment． Half-duplex Ethernet provides a point-to-point link． Full-duplex Ethernet uses a loopback circuit to detect collisions． Half-duplex Ethernet uses a jam signal． Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth． Full-duplex Ethernet uses two wires to send and receive． Half-duplex Ethernet uses one wire to send and receive．

Which encryption type does WPA2 use? AES-CCMP PPK via IV PSK TKIP/MIC

A routing protocol is required that supports: 1) routing update authentication 2) an addressing scheme that conserves IP addresses 3) multiple vendors 4) a network with over 50 routers Which routing protocol fulfills these requirements? RIPv1 RIPv2 EIGRP OSPF

Which wireless LAN design ensures that a mobile wireless client will not lose connectivity when moving from one access point to another? using adapters and access points manufactured by the same company overlapping the wireless cell coverage by at least 10% configuring all access points to use the same channel utilizing MAC address filtering to allow the client MAC address to authenticate with the surrounding APs

IP addresses and routing for the network are configured as shown in the exhibit． The network administrator issues the show ip eigrp neighbors command from Router1 and receives the output shown below the topology． Which statement is true? [*] It is normal for Router1 to show one active neighbor at a time to prevent routing loops． Routing is not completely configured on Router3． The IP addresses are not configured properly on the Router1 and Router3 interfaces． The no auto-summary command configured on the routers prevents Router1 and Router2 from forming a neighbor relationship．

IP addresses and routing for the network are configured as shown in the exhibit． [*] The network administrator issues the show ip eigrp neighbors command from Router1 and receives the output shown below the topology． Which statement is true? It is normal for Router1 to show one active neighbor at a time to prevent routing loops． Routing is not completely configured on Router3． The IP addresses are not configured properly on the Router1 and Router3 interfaces． The no auto-summary command configured on the routers prevents Router1 and Router2 from forming a neighbor relationship．

The router address 192．168．1．250 is the default gateway for both the Web Server 2 and Host 1． What is the correct subnet mask for this network? 255．255．255．0 255．255．255．192 255．255．255．250 255．255．255．252

Refer to the exhibit． A technician is troubleshooting a host connectivity problem． The host is unable to ping a server connected to Switch_A． Based on the results of the testing, what could be the problem? [*] A remote physical layer problem exists． The host NIC is not functioning． TCP/IP has not been correctly installed on the host． A local physical layer problem exists．

Refer to the exhibit． The network administrator is in a campus building distant from Building B． WANRouter is hosting a newly installed WAN link on interface S0/0． The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface． How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner? [*] Telnet to WANRouter and execute the command show interfaces S0/0 Telnet to WANRouter and execute the command show processes S0/0 Telnet to WANRouter and execute the command show running-configuration Telnet to WANRouter and execute the command show controller S0/0 Physically examine the cable between WANRouter S0/0 and the DCE．

Refer to the exhibit． The partial frame shown in the exhibit displays select header information as it arrives at the destination host． Which graphic represents the correct header information in the responding frame returned to the remote host? [*]

When a packet is sent from Host 1 to Server 1, in how many different frames will the packet be encapsulated as it is sent across the internetwork? 0 1 2 3 4

Which are valid modes for a switch port used as a VLAN trunk? transparent auto on desirable blocking

A network administrator is configuring the routers in the graphic for OSPF． The OSPF process has been started and the networks have been configured for Area 0 as shown in the diagram． The network administrator has several options for configuring RouterB to ensure that it will be preferred as the designated router (DR) for the 172．16．1．0 /24 LAN segment． What configuration tasks could be used to establish this preference? [*] Configure the priority value of the Fa0/0 interface of RouterB to a higher value than any other interface on the Ethernet network． Change the router id of Router B by assigning the IP address 172．16．1．130/24 to the Fa0/0 interface of Router B． Configure a loopback interface on RouterB with an IP address higher than any IP address on the other routers． Change the priority value of the Fa0/0 interface of RouterB to zero． Change the priority values of the Fa0/0 interfaces of RouterA and RouterC to zero．

Refer to the exhibit． Which two statements are true based the output of the show frame-relay lmi command issued on the Branch router? [*] LMI messages are being sent on DLCI 0． LMI messages are being sent on DLCI 1023． Interface Serial0/0 is not configured to encapsulate Frame Relay． The Frame Relay switch is not responding to LMI requests from the router． The LMI exchange between the router and Frame Relay switch is functioning properly．

Refer to the exhibit． A problem with network connectivity has been observed． It is suspected that the cable connected to switch port Fa0/9 on Switch1 is disconnected． What would be an effect of this cable being disconnected? [*] Host B would not be able to access the server in VLAN9 until the cable is reconnected． Communication between VLAN3 and the other VLANs would be disabled． The transfer of files from Host B to the server in VLAN9 would be significantly slower． For less than a minute, Host B would not be able to access the server in VLAN9． Then normal network function would resume．

Refer to the output of the two show commands in the exhibit． If an administrator tries to ping host 10．1．8．5 from host 10．1．6．100, how will the ICMP packets be processed by Router A? [*] The packets will be discarded． The packets will be routed out the S0/0 interface． The packets will be routed out the S0/1 interface． The packets will be routed out the Fa0/0 interface．

Users on the 192．168．1．0/24 network must access files located on the Server 1． What route could be configured on router R1 for file requests to reach the server? ip route 0．0．0．0 0．0．0．0 s0/0/0 ip route 0．0．0．0 0．0．0．0 209．165．200．226 ip route 209．165．200．0 255．255．255．0 192．168．1．250 ip route 192．168．1．0 255．255．255．0 209．165．100．250

Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet? Full-duplex Ethernet consists of a shared cable segment． Half-duplex Ethernet provides a point-to-point link． Full-duplex Ethernet uses a loopback circuit to detect collisions． Half-duplex Ethernet uses a jam signal． Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth． Full-duplex Ethernet uses two wires to send and receive． Half-duplex Ethernet uses one wire to send and receive．

Refer to the graphic． How many collision domains are shown? [*] one two three four six

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