// quiz1-1.txt // // Quiz questions and answers Explain how the web and the internet are related. The web is an application that uses the internet The web is an application system popularly used on the internet. The WWW originated at _____________________________________. CERN European Laboratory for Particle Physics in Geneva, Switzerland It was originally developed to ___________________ . allow researchers in the high energy physics community to share data and other information Why was Mosaic a milestone in the development/use of the web? Mosaic was the first graphical interface to the web and it generated a lot of interest in the web because it provided an easier interface Explain the difference between a packet header and a mail header. A packet header contains information used to handle data packets as they travel over a network. A mail header is the information at the top of an email message: subject, from, to, date, etc. Name four different kinds of transmission media. two-wire open lines twisted pair cable coaxial cable optical fiber cable satellite terrestrial microwave terristrial laser terristrial infrared radio Define a data communications protocol. a common language for computer programs which defines the format and meaning of the data that programs interchange Describe the difference between baseband and broadband signalling. Baseband has only one channel of communications, usually data. This is ideally suited for digital transmissions. Broadband can handle multiple channels of communication. Analog transmissions are broadband. Baseband is a form of modulation where signals are placed directly on the transmission media in their original form, i.e. no frequency division multiplexing is performed. Define UTP. unshielded twisted pair--a kind of cable used in data communications networks What is the most commonly used category of cable used in Montgomery Blair computer networks and why? category five UTP; because it is rated for the highest transmission rate for UTP cables--100Mbps What does OSI stand for? Open Systems Interconnection What organization is responsible for creating the OSI reference model? ISO, the International Organization for Standardization Name three services provided by the OSI physical layer. how bits are represented (analog, digital) how to represent the start/end of a transmission whether bits can move in one or both directions at once (half or full duplex) What is CSMA/CD (what does it stand for)? carrier sense multiple access with collision detection Name a LAN technology which uses CSMA/CD. ethernet Name three services provided by the OSI link layer. divide packets into frames sequence information into frames error detection and correction codes into frames handshaking information into frames flow control of frame transmission use physical layer to send/receive frames check frames for errors; correct when required reconstruct packets from frames Name a service provided by the OSI network layer. unified addressing scheme routing services Name a TCP/IP protocol which operates in the network layer. IP, internet protocol RIP, routing information protocol Describe the function of a router and why it is important. A router operates in the OSI network layer and directs packets in the correct direction until it reaches a router which recognizes the correct address. This is important because it prevents all information from reaching every point on the network. This results in lower bandwidth usage and the resulting improvements in network performance. Name three services provided by the OSI transport layer. addressing to processes on a node connection management flow control and buffering resource utilization--multiplexing and parallelization Name a TCP/IP protocol which operates in the transport layer. TCP, transmission control protocol