Cisco Certified Network Associate (CCNA) Exam Study Guide with Complete Solutions

Cisco Certified Network Associate (CCNA) Exam Study Guide with Complete Solutions Purpose of Computer Networks - Correct Answer Computer networks were developed to aggregate the computing power of several individual computers into initially local networks, then campus networks, then metropolitan networks, then countrywide networks, and finally, global networks. A computer network is a group of computer host devices that communicate with each other. Computer Host Devices - Correct Answer - Can be any other devices used to access the network, including servers, workstations, personal computers, smart phones, and laptops. - A network host is a computer or other device connected to a computer network. A host may work as a server offering information resources, services, and applications to users or other hosts on the network. Hosts are assigned at least one network address. Network Devices - Correct Answer Can be any devices that stand between computer host devices, including switches, routers, hubs, repeaters, and firewalls. These devices control and optimize communication between host devices. Network Applications - World Wide Web - Correct Answer Technically, this is a network application that allows the exchange of text pages coded in Hypertext Markup Language (HTML) using the Hypertext Transfer Protocol (HTTP). Initially, these HTML pages only supported hyperlinks to jump from one page to another. Now, HTTP and HTML have been augmented with dynamic extensions to allow a much more advanced, rich, multimedia Web experience than just jumping from one page to another. Network Applications - Electronic Mail - Correct Answer This is a network application that allows the exchange of messages between two hosts. In fact, studies show that this network application is by far the most commonly used network application. Network Applications - File Transfer and File Sharing - Correct Answer This network application allows the transfer of files from one computer host device to another. Several variations of this application exist, such as File Transfer Protocol (FTP), Secure FTP (SFTP), Network File System (NFS), and Server Message Block (SMB), but all versions serve the same purpose: To transfer files from one network host to another. Network Applications - Remote Control - Correct Answer This network application allows you to control a computer host remotely from another host in the network. As with file transfer, several