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IS- 162 Final Exam Winter 2011 Name Enter your answers in the spaces provided. If you feel the need to object to or comment upon any question, put your discussion in blue ink. When finished, save the file under the name <162Final-Your Full Name>. Send to a compressed file so it will get through the email system, and email the compressed file to firstname.lastname@example.org. Include the name of the file in the subject area of the email. I will post the answers on the web site shortly after the final is over. True/False (2 ea) 1. [ ] (TF) 8 bit parallel ribbon cable is highly preferable to serial cable for connecting devices further apart than fifty feet. 2. [ ] (TF) Any processing or transmission of analog signals will degrade the signals. However, a well designed digital channel will deliver perfect data as long as design parameters are not exceeded. 3. [ ] (TF) RJ-45, Registered Jack 45, refers to the important job of documenting the connections while wiring a building. This would be the 45th jack in a registered punch- down block. 4. [ ] (TF) Spread Spectrum is a transmission mode in which a broad band is used. Normally the transmitter and receiver frequency hop, using a pseudo-random sequence. 5. [ ] (TF) A subnet mask of 255.255.255.0 allows for about 255 nodes in the local area network. 6. [ ] (TF) ADSL does not have the same uplink speed as downlink speed. 7. [ ] (TF) Collapsed Backbone refers to a WAN that has crashed and no longer works. 8. [ ] (TF) Modulation is the imposition of information upon a carrier signal. 9. [ ] (TF) 66 blocks and 110 blocks are two versions of punch-down blocks on which telecomm circuits are terminated. 10. [ ] (TF) Bluetooth has a longer range than 802.11 a. 11. [ ] (TF) A two-ring Sonnet ring is self-healing in most cases. 12. [ ] (TF) 10GBase-SW is used in Sonnet. It is one of the copper network standards operating at the same 10 Gb/s transmission speed as fiber. 13. [ ] (TF) VPNs provide private networking, often spanning thousands of miles, using existing networks. 14. [ ] (TF) Statistical multiplexing allows more flexible data transfer, usually resulting in a higher information throughput rate than the nominal data throughput rate. --------------------------------------------------------------------------------- Mult. Choice (2 ea) 1. [ ] (ABCD) Wireless 802.11 g is characterized as: A Uses the 2.4 GHz band B Max throughput of about 54 Mb/s C Nominal range = 100 M D All of the above 2. [ ] (ABCD)Single mode fiber is: A Thicker so it supports longer distance range than multi-mode fiber. B Thinner and supports longer distance range than multi-mode fiber. C Is not viable outside the protected environment of buildings. D Came first. Multi-mode fiber is replacing single mode, since it can carry more signals 3. [ ] (ABCD) Polar satellite orbits are used primarily for: A Long distance communications B Satellite TV C Research, Weather, and GPS D Geosynchronous links. 4. [ ] (ABCD) The radiation patterns for various kinds of antennas vary in the following order: (Tightest pattern first, broadest pattern last) A Dish -- multi-element -- Dipole B multi-element -- Dish -- Dipole C Dipole -- Dish -- multi-element D None of the above. All antennas radiate the same pattern. 5. [ ] (ABCD) When installing a WI-FI wireless net in a building, you should consider the following issues. A Small metal items will scatter the signal B Large metal items will reflect the signal C Both A and B will reduce the integrity of the signal at different points. D The signal cannot propagate through walls. Transmission is strictly line of sight. 6. [ ] (ABCD)If many functional channels are to be carried over long distances, which mode transmission is applicable? A Time-Division Multiplexing B Many individual channels C Frequency division multiplexing D All of the above. 7. [ ] (ABCD) T – Carriers provide a variety of bandwidths (Thoughput rates) Which of the following is correct? A T- 1 – 64 Kb/s B T – 5 -- about 274 Mb/s C T-4 -- about 274 Mb/s D T-3 -- 10 Mb/s 8. [ ] (ABCD) Some common modulation modes used in RF communications are: A FM -- Frequency Modulation B AM – Amplitude Modulation C FSK – Frequency Shift Keying (for data) D All of the above 9. [ ] (ABCD) Remote Desktop, a standard Microsoft application layer process, uses TCP/IP. A Is standard on all Windows operating systems. B Allows risk-free access to your desktop from any internet site C Both of the above D Neither of the above 10. [ ] (ABCD) Of what use is the sequence number in the TCP header? A Helps to re-assemble the data stream B Identifies the sequence of the data in the packet C Identifies the means of sequential data transmission, Async or synchronous D essential to re-assembling the data stream 11. [ ] (ABCD) Digital Phase Modulation can be characterized as A By changing the phase of signals to different parts of an antenna, the phase of the antenna, (the pattern pointing direction) can be changed. B Phase is a constant. It cannot be changed to modulate a carrier signal. C A digital data modulation mode. A phase shift of specific angle indicates a combination of bits for the Baud being sent. D All of the above 12. [ ] (ABCD) In the IP datagram, the Total-Length field occupies 16 bits. Which of the following is an acceptable packet length A 11 bytes B 65536 bytes C 25600 bits D 524288 bits Fill-in (3 ea) 1. TCP occupies which layer in the OSI model? 2. Ethernet occupies which two layers in the OSI model? 3. Two remote access protocols are: (Give the acronyms and the names) 4. What do you call a LAN that segments different groups into subnetworks, each with its own security, but they all use the physical network? 5. On which OSI layer(s) does each of the following operate? Bridge Router Switch 6. A switch uses the destination address in the packet header to direct a packet to its addressed destination. One switch mode reads the whole packet before sending it. The other only needs to read the header before sending it on. Name these two Modes. Essay Questions (6 ea) Answer briefly, but succinctly 1. Identify three significant differences between IPv4 and IPv6. 2. Relate the 802.11 variants by carrier frequency, speed, and compatibility. 3. What role do IRQs (interrupts) play in communications between asynchronous devices, especially devices that operate at significantly different speeds? 4. When installing a new wireless network, what are the important decision points? What do you have to set, and why, at these decision points? 5. How can an Ethernet LAN be both bus and star topology? 6. In class, I briefly discussed the concept that interactions like those represented in the Corning Glass video operate at a high level. What is the relationship between that high- level intercommunications and the low-level networking of the individual items in the house and workplace? Why did I try to separate the two levels? Limit your response to two or three sentences.
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