CSC469569HOMEWORK1.docVIP

CSC 469/569 HOMEWORK 1 Karthik Chandrasekaran 1. Part 1 Answer the following problems from page 67 of the class text : R1, R4, R5, R8, R9, R11, R12. R1. Host system is any networked computer that provides services to other systems or users. These services may include but are not limited to printer, web or database access. Computers that are connected to the Internet are sometimes referred to as End Systems. They are labeled end systems because they sit at the edge of the Internet. The end user always interacts with the end systems. R4. R5. HFC transmission rate is shared among users as the signal is broadcasted in HFC transmission. Collisions are not possible in downstream transmissions because each signal used different bandwidth frequency. R8. Unshielded twisted pairs and fiber optics are the two commonly used physical medium for ethernet. R9. Dial-up – 56 kbps DSL - 256 kilobits per second (kbit/s) to 24,000 kbit/s HFC – Cable modem speeds vary widely. While cable modem technology can theoretically support up to about 30 Mbps, most providers offer service with between 1 Mbps and 6 Mbps bandwidth for downloads, and bandwidth between 128 Kbps and 768 Kbps for uploads. R11. Circuit-switching is more reliable than packet-switching. When you have a circuit dedicated for a session, you are sure to get all information across. When you use a circuit which is open for other services, then there is a big possibility of congestion (which is for a network what a traffic jam is for the road), and hence the delays or even packet loss. R12. On demand sharing of resources for data transmission that does not have a fixed pattern is referred as statistical multiplexing. 2. Part 2 1. Other than conventional computers, (i.e. computers such as laptops, personal computers, minicomputers and mainframes and supercomputers), what other types of devices can appear as nodes in a computer network? (Name at least three). Printers, Smartphone’s, PDA’s and embedded computers in autos like GPS