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试卷名称:思科认证640-802模拟试卷23

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What are two benefits of using a single OSPF area network design?

A．it reduces the number of required OSPF neighbor adjacencies

B．It reduces the types of LSAs that are generated

C．It is less CPU intensive for routers in the single area

D．It increases LSA response times．

E．It removes the need for virtual links

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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．

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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

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

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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

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