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试卷名称:思科认证640-802模拟试卷23

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单选题

Which type of attack is characterized by a flood of packets that are requesting a TCP connection to a server?

A．denial of service

B．brute force

C．reconnaissance

D．Trojan horse

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Refer to the exhibit． Which statement describes DLCI 17? [*] DLCI 17 describes the ISDN circuit between R2 and R3． DLCI 17 describes a PVC on R2． It cannot be used on R3 or R1． DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3． DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider．

The user of Host1 wants to ping the DSL modem/router at 192．168．1．254． Based on the Host1 ARP table that is shown in the exhibit, what will Host1 do? [*] send a unicast ARP packet to the DSL modem/router send unicast ICMP packets to the DSL modem/router send Layer 3 broadcast packets to which the DSL modem/router responds send a Layer 2 broadcast that is received by Host2, the switch, and the DSL modem/router

Refer to the exhibit． The network administrator has created a new VLAN on Switch1 and added host C and host D． The administrator has properly configured switch interfaces FastEthernet0/13 through FastEthernet0/24 to be members of the new VLAN． However, after the network administrator completed the configuration, host A could communicate with host B, but host A could not communicate with host C or host D． Which commands are required to resolve this problem? [*] Router(config)# interface fastethernet 0/1．3 Router(config-if)# encapsulation dot1q 3 Router(config-if)# ip address 192．168．3．1 255．255．255．0 Router(config)# router rip Router(config-router)# network 192．168．1．0 Router(config-router)# network 192．168．2．0 Router(config-router)# network 192．168．3．0 Switch1# vlan database Switch1(vlan)# vtp v2-mode Switch1(vlan)# vtp domain cisco Switch1(vlan)# vtp server Switch1(config)# interface fastethernet 0/1 Switch1(config-if)# switchport mode trunk Switch1(config-if)# switchport trunk encapsulation isl

Which type of attack is characterized by a flood of packets that are requesting a TCP connection to a server? denial of service brute force reconnaissance Trojan horse

Refer to the exhibit．If the devices produced the given output,what is the cause of the EtherChannel problem? [*] There is a speed mismatch between SW1’s Fa0/1 and SW2’s Fa0/1 interfaces． There is an MTU mismatch between SW1’s Fa0/1 and SW2’s Fa0/1 interfaces． There is an encapsulation mismatch between SW1’s Fa0/1 and SW2’s Fa0/1 interface． SW1’s Fa0/1 interface is administratively shut down．

What SNMP message alerts the manager to a condition on the network? response trap cet capture

Which spread spectrum technology does the 802．11b standard define for operation? IR DSSS FHSS DSSS and FHSS IR, FHSS, and DSSS

Refer to the exhibit． What is the most efficient summarization that R1 can use to advertise its networks to R2? [*] 172．1．0．0/22 172．1．0．0/21 172．1．4．0/22 172．1．4．0/24 172．1．5．0/24 172．1．6．0/24 172．1．7．0/24 172．1．4．0/25 172．1．4．128/25 172．1．5．0/24 172．1．6．0/24 172．1．7．0/24

Refer to the exhibit． Switch1 has just been restarted and has passed the POST routine． Host A sends its initial frame to Host C． What is the first thing the switch will do as regards populating the switching table? [*] Switch1 will add 192．168．23．4 to the switching table． Switch1 will add 192．168．23．12 to the switching table． Switch1 will add 000A．8A47．E612 to the switching table． Switch1 will add 000 DB95．2EE9 to the switching table．

Refer to the exhibit． How many broadcast domains exist in the exhibited topology? [*] one two three four five F． s i x

A default Frame Relay WAN is classified as what type of physical network? point-to-point broadcast multi-access nonbroadcast multi-access nonbroadcast multipoint broadcast point-to-multipoint

A single 802．11g access point has been configured and installed in the center of a square office． A few wireless users are experiencing slow performance and drops while most users are operating at peak efficiency． What are three likely causes of this problem? mismatched TKIP encryption null SSID cordless phones 无线电话 mismatched SSID metal file cabinets 金属走档

What are two recommended ways of protecting network device configuration files from outside network security threats? Allow unrestricted access to the console or VTY ports． Use a firewall to restrict access from the outside to the network devices． Always use Telnet to access the device command line because its data is automatically encrypted． Use SSH or another encrypted and authenticated transport to access device configurations． Prevent the loss of passwords by disabling password encryption．

Refer to the exhibit． The access list has been configured on the S0/0 interface of router RTB in the outbound direction． Which two packets, if routed to the interface, will be denied? [*] access-list 101 deny tcp 192．168．15．32 0．0．0．15 any eq telnet access-list 101 permit ip any any source ip address: 192．168．15．5; destination port: 21 source ip address:, 192．168．15．37 destination port: 21 source ip address:, 192．168．15．41 destination port: 21 source ip address:, 192．168．15．36 destination port: 23 source ip address: 192．168．15．46; destination port: 23

What are two security appliances that can be installed in a network? ATM IDS IOS IOX IPS

For security reasons, the network administrator needs to prevent pings into the corporate networks from hosts outside the internetwork． Which protocol should be blocked with access control lists? IP ICMP TCP UDP

Refer to the exhibit ．A network administrator is configuring an EtherChannel between SW1 and SW2 ． The SW1 configuration is show．What is the correct configuration for SW2? [*] Interface FastEthernet 0/1 Channel-group 1 mode active Switchport trunk encapsulation dot1q Switchport mode trunk Interface FastEthernet 0/2 Channel-group 1 mode active Switchport trunk encapsulation dot1q Switchport mode trunk Interface FastEthernet 0/1 Channel-group 1 mode passive Switchport trunk encapsulation dot1q Switchport mode trunk Interface FastEthernet 0/2 Channel-group 1 mode passive Switchport trunk encapsulation dot1q Switchport mode trunk Interface FastEthernet 0/1 Channel-group 1 mode desirable Switchport trunk encapsulation dot1q Switchport mode trunk Interface FastEthernet 0/2 Channel-group 1 mode desirable Switchport trunk encapsulation dot1q Switchport mode trunk Interface FastEthernet 0/1 Channel-group 1 mode auto Switchport trunk encapsulation dot1q Switchport mode trunk Interface FastEthernet 0/2 Channel-group 1 mode auto Switchport trunk encapsulation dot1q Switchport mode trunk

Refer to the exhibit． Assume that all router interfaces are operational and correctly configured． In addition, assume that OSPF has been correctly configured on router R2． How will the default route configured on R1 affect the operation of R2? [*] Any packet destined for a network that is not directly connected to router R1 will be dropped． Any packet destined for a network that is not directly connected to router R2 will be dropped immediately． Any packet destined for a network that is not directly connected to router R2 will be dropped immediately because of the lack of a gateway on R1． The networks directly connected to router R2 will not be able to communicate with the 172．16．100．0, 172．16．100．128, and 172．16．100．64 subnetworks． Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1． R1 will then send that packet back to R2 and a routing loop will occur．

Refer to the topology and router configuration shown in the graphic． A host on the LAN is accessing an FTP server across the Internet． Which of the following addresses could appear as a source address for the packets forwarded by the router to the destination server? [*] 10．10．0．1 10．10．0．2 199．99．9．33 199．99．9．57 200．2．2．17

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