思科第三章答案.doc

窗体顶端A network administrator is designing a network for a new branch office of twenty-five users. What are the advantages of using a client-server model? (Choose two.)centralized administrationdoes not require specialized softwaresecurity is easier to enforcelower cost implementationprovides a single point of failure窗体底端2窗体顶端What are two forms of application layer software? (Choose two.)applicationsdialogsrequestsservicessyntax窗体底端3窗体顶端What is the automated service that matches resource names with the required IP address?HTTPSSHFQDNDNSTelnetSMTP窗体底端4窗体顶端Which statements are correct concerning the role of the MTA in handling email? (Choose three.)routes email to the MDA on other serversreceives email from the clients MUAreceives email via the POP3 protocolpasses email to the MDA for final deliveryuses SMTP to route email between serversdelivers email to clients via the POP3 protocol窗体底端5窗体顶端A small home network has been installed to interconnect three computers together for gaming and file sharing. What two properties represent this network type? (Choose two.)User accounts are centralized.Security is difficult to enforce.Specialized operating system software is required.File permissions are controlled by a single computer.A computer that responds to a file sharing request is functioning as a server.窗体底端6窗体顶端What are two characteristics of clients in data networks? (Choose two.)use daemonsinitiate data exchangesare repositories of datamay upload data to serverslisten for requests from servers窗体底端7窗体顶端What application layer protocol describes the services that are used for file sharing in Microsoft networks?DHCPDNSSMB 中小企业SMTPTelnet窗体底端8窗体顶端Which layer of the OSI model supplies services that allow user to interface with the network?physicalsessionnetworkpresentationapplicationtransport窗体底端9窗体顶端As compared to SSH, what is the primary disadvantage of telnet?not widely availabledoes not support encryptionconsumes more network bandwidthdoes not support authentication窗体底端10窗体顶端Which email components are used to forward mail between servers? (Choose two.)MDAIMAPMTAPOPSMTPMUA窗体底端11窗体顶端Which two protocols are used to control the transfer of web resources from a web server to a client browser? (Choose two.)ASPFTPHTMLHTTPHTTPSIP窗体底端12窗体顶端What is the purpose of resource records in DNS?temporarily holds resolved entriesused by the server to resolve namessent by the client to the server during a querypasses authentication information between the server and client窗体底端13窗体顶端What are two characteristics of peer-to-peer networks? (Choose two.)scalableone way data flowdecentralized resourcescentralized user accountsresource sharing without a dedicated server窗体底端14窗体顶端Which application layer protocols correctly match a corresponding function? (Choose two.)DNS dynamically allocates IP addresses to hostsHTTP transfers data from a web server to a clientPOP delivers email from the client to the server email serverSMTP supports file sharingTelnet provides a virtual connection for remote access窗体底端15窗体顶端Refer to the exhibit. What is the destination port for the communication that is represented on line 5?80126115533391265520窗体底端窗体顶端How does the application layer on a server usually process multiple client request for services?ceases all connections to the servicedenies multiple connections to a single daemonsuspends the current connection to allow the new connectionuses support from lower layer functions to distinguish between connections to the service窗体底端17窗体顶端What three protocols operate at the Application layer of the OSI model? (Choose three.)ARPDNSPPPSMTPPOPICMP窗体底端18窗体顶端What are three properties of peer-to-peer applications? (Choose three.)acts as both a client and server within the same communicationrequires centralized account administrationhybrid mode includes a centralized directory of filescan be used in client-server networksrequires a direct physical connection between devicescentralized authentication is required窗体底端19窗体顶端What is the role of the OSI application layer?provides segmentation of dataprovides encryption and conversion of dataprovides the interface between the applications on either end of the networkprov