As the Ezonexam network administrator, you are required to have a firm understanding of the OSI model. Why does the data communication industry use the layered OSI reference model? (Choose two)A．It enables equipment from different vendors to use the same

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You enabled CDP on two Cisco Routers which are connected to each other. The Line and Protocol statusfor the interfaces on both routers show as UP but the routers do not see each other a CDP neighbors.Which layer of the OSI model does the problem most likely exist？（）

• A、Physical
• B、Session
• C、Application
• D、Data-Link
• E、Network

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You are the network administrator for All network servers run Windows Server 2003. Recently, another network administrator create a scheduled task to perform a normal backup of Microsoft Exchange Server 2003 compuer every Saturday night. You need to perform maintenance tasks on the Exchange server on this Saturday night only. If the backup starts while you are performing the maintenance tasks,data might be corrupted. You need to ensure that the backup task does not start while you perform the maintenance tasks. What are two possible ways to achieve this goal? (Each correct answer presents a complete solution.（）Choose two.)

• A、In the Backup utility, clear the Enabled (scheduled tasks runs at specified time) check box.
• B、In Control Panel, use Scheduled Tasks to pause Task Scheduler.
• C、Run the Schtasks command with the /end /p parameters.
• D、Use the Services snap-in to change the startup type of the Task Scheduler service from Automatic to Manual.

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You need to decide on the best router redundancy protocol to use in the Company network.  Which  two statements are true about HSRP， VRRP， and GLBP？（）

• A、 GLBP and VRRP allow for MD5 authentication， whereas HSRP does not.
• B、 HSRP allows for multiple upstream active links being simultaneously used， whereas GLBP  does not.
• C、 GLBP allows for router load balancing of traffic from a network segment without the different  host IP configurations required to achieve the same results with HSRP.
• D、 Unlike HSRP and VRRP， GLBP allows automatic selection and simultaneous use of multiple  available gateways.
• E、 GLBP allows for router load balancing of traffic from a network segment by utilizing the creation  of multiple standby groups.

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Why does the data communication industry use the layered OSI reference model? (Choose two.)（）

• A、It divides the network communication process into smaller and simpler components， thus aiding component development， design， and troubleshooting.
• B、It enables equipment from different vendors to use the same electronic components， thus saving research and development funds.
• C、It supports the evolution of multiple competing standards， and thus provides business opportunities for equipment manufacturers.
• D、It encourages industry standardization by defining what functions occur at each layer of the model.
• E、It provides a means by which changes in functionality in one layer require changes in other layers.

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You work as a senior administrator at ABC.com. The ABC.com network consists of a single domain named ABC.com. All servers on the ABC.com network have Windows Server 2012 R2 installed. You are running a training exercise for junior administrators. You are currently discussing printer pooling.Which of the following is TRUE with regards to printer pooling？（）

• A、Printers in a pool must be of the same model， and use the same printer driver
• B、Each printer in the pool must have a different printer driver.
• C、Printer ports used in the pool must be of the same type
• D、The types of printer ports used in the pool must be mixed.
• E、Pooled printers appear to workstations as a single printer.
• F、A minimum of three printers are required to configure a printer pool.

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What are two recommended ways of protecting network device configuration files from outside network security threats (Choose two.)（）。

• A、Allow unrestricted access to the console or VTY ports
• B、Use a firewall to restrict access from the outside to the network devices
• C、Always use Telnet to access the device command line because its data is automatically encrypted
• D、Use SSH or another encrypted and authenticated transport to access device configurations
• E、Prevent the loss of passwords by disabling password encryption

第17题：

A computer is connected to the network through a NIC， which has a unique assignment that is called the Ethernet MAC address. Which layer of the OSI model does the MAC address use to communicate with the network？（）

• A、 network
• B、 application
• C、 session
• D、 data link

第18题：

Which description about asymmetric encryption algorithms is correct？（）

• A、They use the same key for encryption and decryption of data.
• B、They use different keys for decryption but the same key for encryption of data.
• C、They use different keys for encryption and decryption of data.
• D、They use the same key for decryption but different keys for encryption of data.

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The TCP/IP network model differs from the more popular OSI model. Which of the layers below belong to the TCP/IP model?（）

• A、application layer
• B、session layer
• C、transport layer
• D、internet layer
• E、network layer
• F、data link layer
• G、physical layer

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A network administrator receives complaints from the engineering group that an application on one server is not working properly. After further investigation, the administrator determines that source NAT translation is using a different source address after a random number of flows. Which two actions can the administrator take to force the server to use one address?（） (Choose two.)

• A、Use the custom application feature.
• B、Configure static NAT for the host.
• C、Use port address translation (PAT).
• D、Use the address-persistent option.

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