2017年思科认证模拟试题及答案三
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The network security policy for Ezonexam requires that only one host be permitted to attach dynamically to each switch interface. If that policy is violated, the interface should be automatically disabled. Which two commands must the Ezonexam network administrator configure on the 2950 Catalyst switch to meet this policy? (Choose two)
- A.SWEzonexam1(config-if)# switchport port-security maximum 1
- B.SWEzonexam1(config)# mac-address-table secure
- C.SWEzonexam1(config)# access-list 10 permit ip host
- D.SWEzonexam1(config-if)# switchport port-security violation shutdown
- E.SWEzonexam1(config-if)# ip access-group 10
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Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)
- A.Full-duplex Ethernet uses CSMA/CD to prevent collisions.
- B.Half-duplex Ethernet uses a loopback circuit to detect collisions.
- C.A full-duplex Ethernet card allows 20Mbps for data transmission.
- D.Full-duplex Ethernet makes use of two pairs of wires for data.
- E.An Ethernet hub can operate both half and full duplex simultaneously.
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The LAN needs are expanding at the Ezonexam corporate office, which is quickly growing. You are instructed to enlarge the area covered by a single LAN segment on the Ezonexam network.
Which of the following are layer 1 devices that you can use? (Choose all that apply.)
- A.A switch
- B.A router
- C.A network adapter card
- D.A hub
- E.A repeater
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Why is full-duplex Ethernet superior to its single-duplex counterpart? (Select two answer choices.)
- A.It uses inexpensive hubs
- B.It operates without collisions
- C.It operates on switches
- D.It provides faster data transfer
- E.It utilizes fewer wiring pairs
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The Ezonexam network Topology is displayed in the exhibit below:
- A switch has been configured for three different VLANs: VLAN 2, VLAN 3, and VLAN 4. For the purposes of communication between VLANs a router is to be added. Host from one VLAN should be able to reach the hosts in the other VLANs.
- Based on this requirement, what type of connection is acceptable between the router and switch? (Select all valid answers)
- A.10 Mbps Ethernet
- B.56 kbps serial
- C.100 Mbps Ethernet
- D.1,544 Mbps serial
- E.1000 Mbps Ethernet
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With regard to Ethernet media access methods, which of the following are true?
(Choose all that apply.)
- A.A device waits for an electronic signal before transmitting.
- B.A device listens and waits until the media is not busy before transmitting.
- C.All devices on an Ethernet segment see data that passes on the network medium.
- D.Only the sender and the receiver devices see data that passes on the network medium.
- E.Ethernet networks allow you to configured devises with higher transmission priority.
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The Ezonexam network administrator needs to determine what LAN devices to install on the Ezonexam network. What are two advantages of using Layer 2 Ethernet switches over hubs? (Choose two)
- A.Allowing simultaneous frame. transmissions
- B.Increasing the size of broadcast domains
- C.Increasing the maximum length of UTP cabling between devices
- D.Filtering frames based on MAC addresses
- E.Decreasing the number of collision domains
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Regarding the extended ping command; which of the statements below are true?
(Select all valid answer choices)
- A.The extended ping command is supported from user EXEC mode.
- B.The extended ping command is available from privileged EXEC mode.
- C.With the extended ping command you can specify the TCP and UDP port to be pinged.
- D.With the extended ping command you can specify the timeout value.
- E.With the extended ping command you can specify the datagram size.
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Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)
- A.Each device on the Ethernet segment stops transmitting for a short time.
- B.A jam signal informs all devices that a collision occurred.
- C.When data transmission resumes, the devices that were involved in the collision have priority to transmit.
- D.The devices that are involved in the collision stops transmitting for a short time.
- E.The collision invokes a random back-off algorithm.
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Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use?
- A.255.255.255.192
- B.255.255.255.224
- C.255.255.255.240
- D.255.255.255.248
- E.None of the above
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What are two characteristics of "store and forward" switching? (Select two answer choices)
- A.Latency fluctuates regardless of frame. size.
- B.The switch receives the complete frame. before beginning to forward it.
- C.Latency through the switch varies with frame. length.
- D.The switch checks the destination address upon receipt of headers.
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On the topic of VLSM, which one of the following statements best describes the concept of the route aggregation?
- A.Deleting unusable addresses through the creation of many subnets.
- B.Combining routes to multiple networks into one supernet.
- C.Reclaiming unused space by means of changing the subnet size.
- D.Calculating the available host addresses in the AS.
- E.None of the above
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The network administrator has configured port security on a Ezonexam switch. Why would a network administrator configure port security on this Ezonexam device?
- A.To prevent unauthorized hosts from getting access to the LAN
- B.To limit the number of Layer 2 broadcasts on a particular switch port
- C.To prevent unauthorized Telnet or SSH access to a switch port
- D.To prevent the IP and MAC address of the switch and associated ports
- E.None of the above
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You are a senior network administrator at Ezonexam, and while performing the password recovery procedure on your 2500 series Cisco router, you type in the following command:
o/r 0x2142
What is the purpose of this command?
- A.It is used to restart the router.
- B.It is used to bypass the configuration in NVRAM.
- C.It is used to enter ROM Monitor mode.
- D.It is used to view the lost password.
- E.It is used to save the changes to the configuration.
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What is the purpose of the Spanning Tree Protocol (STP)?
- A.To prevent routing loops
- B.To create a default route
- C.To provide multiple gateways for hosts
- D.To maintain a loop-free Layer 2 network topology
- E.To enhance the functions of SNMP
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You are a systems administrator and you are about to assign static IP addresses to various servers on your network. For the network 192.168.20.24/29 the router is assigned to the first usable host address, while the last usable host address goes to your Sales server. Which one of the following commands would you enter into the IP properties box of the sales server?
- A.IP address: 192.168.20.14 Subnet Mask: 255.255.255.248 Default Gateway: 192.168.20.9
- B.IP address: 192.168.20.254 Subnet Mask: 255.255.255.0 Default Gateway: 192.168.20.1
- C.IP address: 192.168.20.30 Subnet Mask 255.255.255.248 Default Gateway: 192.168.20.25
- D.IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.17
- E.IP address: 192.168.20.30 Subnet Mask 255.255.255.240 Default Gateway: 192.168.20.25
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Which one of the following characteristics is true regarding the use of hubs and switches?
- A.Hubs can have their ports be configured with VLANs
- B.Using hubs is costly with regard to bandwidth availability.
- C.Switches can not forward broadcasts.
- D.Switches are more efficient than hubs in processing frames.
- E.Switches increase the number of collision domains in the network.
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While troubleshooting a connectivity problem on the network, you issue the ping command from your PC command prompt, but the output shows "request times out."
- At which OSI layer is this problem associated with?
- A.The data link layer
- B.The application layer
- C.The access layer
- D.The session layer
- E.The network layer
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When you use the ping command to send ICMP messages across a network, what's the most common request/reply pair you'll see? (Select one answer choice)
- A.Echo request and Echo reply
- B.ICMP hold and ICMP send
- C.ICMP request and ICMP reply
- D.Echo off and Echo on
- E.None of the above
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During the boot sequence, a Ezonexam 2800 series router needs to locate and load an operating system. What is the default order the router uses to find an operating system?
- A.ROM, TFTP server, Flash
- B.Flash, TFTP server, ROM
- C.Flash, NVRAM, TFTP server
- D.Flash, ROM, TFTP server
- E.Flash, TFTP server, RAM
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The corporate head office of Ezonexam has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence, what will happen?
- A.UDP will send an ICMP Information Request to the source host.
- B.UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
- C.UDP will drop the datagrams.
- D.UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.
- E.UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.
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At which layer of the OSI model does the protocol that provides the information displayed by the "show cdp neighbors" command operate?
- A.Transport
- B.Physical
- C.Application
- D.Data link
- E.Network
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You need to configure a default route on a Ezonexam router. Which command will configure a default route on a router?
- A.VE1(config)# ip route 0.0.0.0 10.1.1.0 10.1.1.1
- B.VE1(config)# ip default-route 10.1.1.0
- C.VE1(config)# ip default-gateway 10.1.1.0
- D.VE1(config)# ip route 0.0.0.0 0.0.0.0 10.1.1.1
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You are bringing up a new Ezonexam switch, and wish to connect it via a trunk to another switch from a different vendor, which uses the IEEE standard for the trunking method. When setting the encapsulation type on the trunk, what should you configure on the Cisco switch?
- A.Switch(config)# switchport trunk encapsulation isl
- B.Switch(config)# switchport trunk encapsulation ietf
- C.Switch(config-if)# switchport trunk encapsulation isl
- D.Switch(config-if)# switchport trunk encapsulation ietf
- E.Switch(config-if)# switchport trunk encapsulation dot1q
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You have just purchased a brand new router and wish to have the router prompt you through the initial configuration commands. Which router mode does this describe?
- A.ROM Monitor mode
- B.SETUP mode
- C.Autoflash mode
- D.RXBOOT mode
- E.None of the above
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Ezonexam has implemented the use of the Virtual Trunking Protocol (VTP). Which statement below accurately describes a benefit of doing this?
- A.VTP will allow physically redundant links while preventing switching loops
- B.VTP will allow switches to share VLAN configuration information
- C.VTP will allow a single port to carry information to more than one VLAN
- D.VTP will allow for routing between VLANs
- E.None of the above
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You have a class C network, and you need to design it for 5 usable subnets with each subnet handling a minimum of 18 hosts each. Which of the following network masks should you use?
- A.225.225.224.0.
- B.225.225.240.0.
- C.225.225.255.0.
- D.255.255.255.224
- E.225.225.255.240
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After connecting a PC to an available port on a switch, you find that the PC can not access any of the resources on the LAN. No other PC's connected to the switch appear to be having any issues. What is the most likely cause for this problem?
- A.The router lacks a routing table entry for the new host
- B.The host switch port is assigned to the incorrect VLAN
- C.The host MAC address is incorrectly configured
- D.A STP instance for the new host has not been initialized
- E.The switch does not have the MAC address hard coded in the CAM table.
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You need to perform. some initial configuration tasks on a new Ezonexam switch. What is the purpose of assigning an IP address to a switch?
- A.To provide local hosts with a default gateway address
- B.To allow remote management of the switch.
- C.To allow the switch to respond to ARP requests between two hosts
- D.To ensure that hosts on the same LAN can communicate with each other.
- E.None of the above
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Study the Exhibit below carefully:
London#show vtp
VTP Version: 2
Configuration Revision: 0
Maximum VLANs supported locally: 64
Number of existing VLANs: 5
VTP Operating Mode: Client
VTP Domain Name: London
VTP Pruning Mode: Disabled
VTP V2 Mode: Disabled
VTP Traps Generation: Disabled
Based on the information given above, what is the VTP function of this particular switch?
- A.Learn and save VTP configuration in the running configuration.
- B.Create and change VLANs.
- C.Forwards information about VTP configuration.
- D.VTP is disabled on this device.
- E.VTP is not saved to NVRAM.