Unit 4: Computer Networks

Which of the following is the best definition of a computer network? A computer network consists of two or more computers linked together that share devices such as printers and file servers but they are not able to share software. A computer network is a collection of computers and computer resources (e.g., printers, file servers) connected in such a way that the computers can communicate with each other and their resources. A computer network consists of one computer connected wirelessly to a printer. A computer network consists of a number of computers connected via a device that allows them to connect to the Internet.

A computer network is a collection of computers and computer resources (e.g., printers, file servers) connected in such a way that the computers can communicate with each other and their resources. Correct. Computer networks include the physical computers as well as other hardware devices such as printers and software and networks allow all devices to communicate.

How do virtual machines support a business computing ecosystem? A virtual machine (VM) is a whole separate physical computer that provides users access to an OS different from their primary computer. Being able to have access to a computer with a different OS facilitates collaboration in the business ecosystem. A virtual machine (VM) is a broadcasting device that facilitates communication across a network, thus supporting a business computing ecosystem. A virtual machine (VM) is made available by software and permits a computer to run multiple OSs. In a business ecosystem, this allows for improved collaboration that is not restricted by platform software. A virtual machine (VM) is a server that users can log into and use different OSs and applications associated with the different OSs.

A virtual machine (VM) is made available by software and permits a computer to run multiple OSs. In a business ecosystem, this allows for improved collaboration that is not restricted by platform software. Correct. A virtual machine allows a computer of one operating system to run other operating systems and applications specific to that alternative OS.

Why would it be desirable to use a switch as opposed to a hub in a network? Because switches only transfer information to specific computers within a network and not all of the computers, the bandwidth used with a switch is less than that of a hub. Because a switch is a more powerful device, it can be used over longer distances compared to a hub. Because switches only transfer information to specific computers within a network and not all of the computers, the bandwidth used with a switch is more than that of a hub.

Because switches only transfer information to specific computers within a network and not all of the computers, the bandwidth used with a switch is less than that of a hub. Correct. This choice correctly reflects the difference between a switch and a hub.

Which of the following statements is true of computer networks? Computer networks allow individuals to share many types of resources. Computer networks are not useful unless they are connected to the internet. Computer networks allow individuals to share hardware such as printers, but not software. Computer Networks are inherently secure.

Computer networks allow individuals to share many types of resources. Correct. Networks allow the transmission of documents, video, audio and other types of files as well as shared resources.

Which of the following servers can generate reports from client queries? Web server Database server File server Mail server

Database server Correct. The database server generates reports based on client queries.

Which of the following are characteristics of a packet-switched network? A. The path exists during the entire transmission, allowing communication in either direction to occur simultaneously. B. The choice of pathway is based on network availability and amount of message traffic. C. The route is established one branch at a time. D. A and B E. B and C

E. B and C Correct. Both B and C are characteristics of a packet-switched network.

Which of the following is NOT a characteristic of a bus network topology? Expensive compared to other topologies. Is one of the more simple types of network topographies. Is a very reliable form of network. All messages travel along a single cable.

Expensive compared to other topologies. Correct. This answer does not describe a bus network.

What is the most common type of local, physical network connection in use today? Radio towers and satellite Fiber optic cable and radio towers Coaxial and radio towers Fiber optic and UTP

Fiber optic and UTP Correct. The most common form of local, physical network connection used today is UTP (Unshielded Twisted Pair) and fiber optic cable. However, UTP is becoming a less common technology utilized for connections with fiber to the home, coax from cable providers, and wifi/cellular communications from mobile devices.

Which of the following type of transmission is paired correctly with the given media? Coaxial cable - Light impulses Fiber optic cable - Light impulses Fiber optic cable - Electricity Coaxial cable - Radio waves

Fiber optic cable - Light impulses Correct. Fiber optics uses light pulses for transmitting information.

Which of the following describes a local computer? It is a computer that a person is physically at. It is a computer that is accessed over the network. Servers are often this type of computer. It is often part of a computer network.

It is a computer that a person is physically at. Correct. Where a person and computer are located together makes a computer local.

Which of the following servers monitors requests, but doesn't send files in return? Web server File server FTP server Print server

Print server Correct. A print server only sends acknowledgement that a print job is complete or sends an error message. A print server does not send files.

Which of the following devices is used to connect one network to another network? Switch Router Hub

Router Correct. Routers are the main means of connection between one network and another.

Which of the following communication system hardware devices is commonly used as a wireless access point? Hub Radio waves Router Switch

Router Correct. Routers can be used as a wireless access point, although not all routers are wirelessly enabled.

Which of the following types of networks has each device in the network connected in a single point-to-point connection with a central HUB? Bus network Star network Ring network Mesh network

Star network Correct. In the star network, all devices have a single point-to-point connection with a central server.

In a client-server network, what is the role of the server? The role of the server is to send out requests for information. The role of the server is the same as the role of the client because all of the computers on this type of network are equal. The role of the server is to take requests from the client and send back the requested information. The role of the server is to maintain connections to remote servers.

The role of the server is to take requests from the client and send back the requested information. Correct. This is the role of the server in a client-server network.

How do a router and switch differ when handling a message? The router will purposefully drop messages if message traffic exceeds its capacity. Both a router and a switch use the message's destination address to select the line to route the incoming message to. There is no difference in how a router and a switch handle messages. The switch will purposefully drop messages if message traffic exceeds its capacity.

The router will purposefully drop messages if message traffic exceeds its capacity. Correct. A router has additional decision-making capabilities compared to a switch.

Which of the following servers responds to HTTP requests on the Internet? FTP server File server Print server Web server

Web server Correct. A web server responds to requests from anywhere on the Internet, not just from a LAN.