cis chap 7dsm
A simple computer network consists of computers, a network operating system (NOS) residing on a dedicated server computer, cable (wiring) connecting the devices, switches, and a router. __________ consists only of computers, a connection medium, network operating system software, and either a hub or a switch.
A basic network
Which of the following statements best describes wireless sensor networks (WSNs)?
Wireless sensor networks (WSNs) are networks of interconnected wireless devices with built-in processing, storage, and radio frequency sensors and antennas that are embedded into the physical environment to provide measurements of many points over large spaces.
When a user sends a message to another user on the Internet or another TCP/IP network, the message is first decomposed into packets. The packets are then sent from the client to the network server. At the destination address, the packets are reassembled into the original message. __________ is the unique string of numbers that is assigned to a device connected to the Internet.
An Internet Protocol (IP) address
Cable television vendors use their network infrastructure to provide high-speed access to the Internet. Which of the following describes cable Internet connections?
Cable Internet connections use digital cable coaxial lines to deliver high-speed Internet access to homes and businesses.
The Domain Name System is a hierarchical system with a root domain, top-level domains, second-level domains, and host computers at the third level. What does the Domain Name System (DNS) convert?
Domain names to IP addresses/ IP addresses
The Domain Name System is a hierarchical system with a root domain, top-level domains, second-level domains, and host computers at the third level. What does the Domain Name System (DNS) convert?
Domain names to IP addresses
There are many kinds of networks and ways of classifying them. One way of looking at networks is in terms of their geographic scope. Which of the following types of networks is designed to connect personal computers and other digital devices within a half mile?
LAN
Larger LANs have many clients and multiple servers, with separate servers for specific services such as storing and managing files and databases, managing printers, storing and managing email, or storing and managing web pages. Which of the following is a network that spans a city and its major suburb?
Metropolitan area network
Today, messages are first broken down into small fixed bundles of data. The bundles include information for directing it to the right address and for checking transmission errors along with the data. This method is more efficient since the bundles of data originating at one source will be routed through many paths and networks before being reassembled into the original message when they reach their destinations. Which of the following is a method of slicing digital messages into parcels called packets, sending the packets along different communication paths as they become available, and then reassembling the packets once they arrive?
Packet switching
In some networks, messages are broken into smaller units that contain information about the source and destination, and then sent via a network. The lower the delay in the smaller units reaching its destination, the more suitable for interactive traffic. Which of the following statements is true of packet switching?
Packet switching is a method of slicing digital messages into parcels called packets, sending the packets along different communication paths as they become available, and then reassembling the packets once they arrive.
__________ provide(s) a powerful technology for tracking the movement of goods using tiny tags with embedded data about an item and its location.
Radio frequency identification (RFID) systems
As a part of a certain communication technology, an IP network provides a single voice-data infrastructure for both telecommunications and computing services, so companies no longer have to maintain separate networks or provide support services and personnel for each type of network. Which communication technology does the scenario describe?
Voice over IP (VoIP)
In a typical telecommunications network, diverse hardware and software components need to work together to transmit information. Different components in a network communicate with each other by adhering to a common set of rules and procedures governing how information travels between two points in a network. __________ establishes a connection between the computers, sequences the transfer of packets, and acknowledges that the packets were sent.
Transmission Control Protocol
A client computer connecting to the Internet has access to services such as email, chatting and instant messaging, electronic discussion groups, Telnet, File Transfer Protocol (FTP), and the web. Which of the following major Internet services is used for person-to-person messaging and document sharing?
In the 1970's DARPA developed a suite of rules and procedures to handle the movement of data between computers. Transmission Control Protocol __________.
establishes a connection between the computers, sequences the transfer of packets, and acknowledges that the packets were sent
In its simplest form, a network consists of two or more connected computers. __________ are very simple devices that connect network components, sending a packet of data to all other connected devices.
hubs
Mobile is now the leading digital platform, with total activity on smartphones and tablets accounting for two-thirds of digital media time spent, and smartphone apps alone capturing more than half of digital media time (Comscore, 2017). Earlier generations of cellular systems were designed for voice and short text messages. Today there are much higher transmission speeds. 3G networks differ from 4G networks in that 3G networks __________.
offer fair transmission speeds for browsing the Web but are too slow for videos
Cellular networks are evolving toward high-speed, high-bandwidth, digital packet-switched transmission. While broadband 3G and 4G networks have high transmission rates, soon 5G networks will be capable of transmitting in the gigabit range. 4G networks differ from 3G networks in that 4G networks __________.
provide more than enough capacity for watching high-definition videos on smartphones
There are many kinds of networks and ways of classifying them. One way of looking at networks is in terms of their geographic scope. The Internet is the most universal and powerful __________.
wide area network
LANs typically connect a few computers in a small office, all the computers in one building, or all the computers in several buildings in close proximity. Which of the following statements best describes a local area network (LAN)?
A local area network (LAN) is designed to connect personal computers and other digital devices within a half-mile or 500-meter radius.
Larger LANs have many clients and multiple servers, with separate servers for specific services such as storing and managing files and databases, managing printers, storing and managing email, or storing and managing web pages. Which of the following best describes a metropolitan area network (MAN)?
A metropolitan area network (MAN) is a network that spans a metropolitan area, usually a city and its major suburbs.
_________ is a secure, encrypted, private network that has been configured within a public network to take advantage of the economies of scale and management facilities of large networks.
A virtual private network (VPN)
What is a virtual private network (VPN)?
A virtual private network (VPN) is a secure, encrypted, private network that has been configured within a public network to take advantage of the economies of scale and management facilities of large networks.
Every device connected to the Internet (or another TCP/IP network) is assigned a unique indentifier consisting of a string of numbers. What is an Internet Protocol (IP) address?
An IP address is the unique string of numbers assigned to a device connected to the Internet.
There are many kinds of networks and ways of classifying them. One way of looking at networks is in terms of their geographic scope. __________ span broad geographical distances—entire regions, states, continents, or the entire globe.
Wide area networks (WANs)
The Internet is the world's most extensive public communication system. It's also the world's largest implementation of client/server computing and inter-networking, linking millions of individual networks all over the world. __________ uses digital cable coaxial lines to deliver high-speed Internet access to homes and businesses.
Cable Internet
Daniel wants to establish a broadband connection between his computer and the local ISP. He decides to set up a connection that can operate over his existing telephone lines to carry voice, data, and video at transmission rates ranging from 385 Kbps to 3 Mbps. Which of the following will best help Daniel establish such a connection?
Digital subscriber line (DSL)
When you connect to the Internet, you might connect through a regular modem, through a local-area network connection in your office, through a cable modem or through a digital subscriber line (DSL) connection. Which of the following technologies operate over an existing telephone line to carry voice, data, and video transmission rates ranging from 385 Kbps to 3 Mbps?
Digital subscriber line (DSL)
In its simplest form, a network consists of two or more connected computers. __________ are very simple devices that connect network components, sending a packet of data to all other connected devices.
Hubs
If you had to connect the computers for two or more employees in the same office, you would need a computer network. In its simplest form, a network consists of two or more connected computers. Which of the following statements best describes hubs?
Hubs are very simple devices that connect network components, sending a packet of data to all other connected devices.
The Domain Name System is a hierarchical system with a root domain, top-level domains, second-level domains, and host computers at the third level. Domain Name Systems (DNS) servers maintain a database containing ________ mapped to their corresponding domain names.
IP addresses
Each Internet service is implemented by one or more software programs. All the services may run on a single server computer, or different services may be allocated to different machines. Which of the following major Internet services is used to retrieve, format, and display information using hyperlink links?
World Wide Web
Bluetooth enables a variety of devices, including cell phones, smartphones, wireless keyboards and mice, PCs, and printers, to interact wirelessly with each other within a close proximity. Bluetooth differs from WiMax in that Bluetooth __________.
can only link up to eight devices within a 10-meter area
The __________ routes and manages communications on the network and coordinates network resources.
network operating system
