...COMP2330 Data Communications and Networking Written Assignment 1 Sample Solutions 1. Which of the OSI layers handles each of the following: (a) Dividing the transmitted bit stream into frames. (b) Determining which route through the subnet to use. (10 marks) Ans: (a) Data Link Layer (b) Network Layer 2. An image is 1024x768 pixels with 3 bytes/pixel. Assume the image is uncompressed. How long does it take to transmit it over a 56-kbps modem channel? Over a 1-Mbps cable modem? Over a 10-Mbps Ethernet? Over 100-Mbps Ethernet? (10 marks) Ans: The size of the image is 1024 x 768 x 3 x 8 = 18874368 bits. For a 56-kbps modem, it takes 18874368/56000 337 seconds. For a 1-Mbps cable modem, it takes 18864368/106 18.9 seconds. For a 10-Mbps Ethernet, it takes around 1.89 seconds. For a 100-Mbps Ethernet, it takes around 0.19 seconds. 3. A digital signaling system is required to operate at 9600bps. (10 marks) (a) If a signal element encodes a 4-bit word, what is the minimum required bandwidth of the channel if we assume a noise free system? (b) Repeat part (a) for the case of 8-bit words. Ans: Because we assume noise free, we can use Nyquist’s equation: C = 2B log2M. We have C = 9600 bps (a) log2M = 4, because a signal element encodes a 4-bit word. (So, actually M=16). ...
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...Determining Databases and Data Communications Lucinda Degarmo BIS/320 November 02, 2015 Karl Jaufmann | Scenario 1 As the marketing assistant, I would definitely have to use a program that would track ordering, delivery and losses of any equipment used. The typical fields that would be needed for such database would be the following: Event Name, Event Date, Name of equipment/display, Serial Number, Date ordered, Date shipped, Date delivered, Date packed, Date shipped, Date received, Loss remarks. The first tracking relationships would be of course the Event Name, Event date and Name of equipment, Date ordered. By tracking these fields, I would be able to figure out what types of equipment or displays to order for the event and ensure timely delivery for the event. The second tracking relationships would be the return of the equipment which would include packing date, shipping date and date received and any losses incurred. By tracking the return of the equipment, I would be sure that the equipment has been accounted for and safely returned back to the warehouse. By using a tracking program for each event, the accountability for the equipment is monitored from the day it leaves the warehouse and is returned safely back to the warehouse. A database would definitely be needed to track the inventory. Excel could handle the tracking input and output; however, since the shipping and receipt of the equipment would not be readily available another database...
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...Introduction to Data Communication As the world of data communication and networking is changing a transformation of the marketing world is a challenge to stay connected with real world through devices in real time such as mobile phone, tablets, computers and laptops. The modern day marketing have to combine the creative side of discipline and this could be a huge challenge. Three areas of the changing transformation within the market of data communication are by speed, relevance and the reaches within campaigns which has increased greatly through different ways in which people may access the media, like through Facebook, YouTube, cell phones and computers. The changing system bring about a particular tool or system and for any brand of systems to work together in the networking world and brand teams of technologizes be placed to implement new systems. One such resource is “Organizational Challenges to the Adoption of the Internet” gives important update of the changes within the networking community. (www.ncbi.nlm.nih.gov). Current trends that affect the data communication are market trends in which these they show opportunities on how to grow business successfully and take advantages of the many positive changes and guard against the negative ones. While the market trend does effectively also inform it also save organizations from reacting to late when it comes to surprises that may occur while keeping ahead of the many competitors when developing business growth...
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...What is Data Communications? The distance over which data moves within a computer may vary from a few thousandths of an inch, as is the case within a single IC chip, to as much as several feet along the backplane of the main circuit board. Over such small distances, digital data may be transmitted as direct, two-level electrical signals over simple copper conductors. Except for the fastest computers, circuit designers are not very concerned about the shape of the conductor or the analog characteristics of signal transmission. Frequently, however, data must be sent beyond the local circuitry that constitutes a computer. In many cases, the distances involved may be enormous. Unfortunately, as the distance between the source of a message and its destination increases, accurate transmission becomes increasingly difficult. This results from the electrical distortion of signals traveling through long conductors, and from noise added to the signal as it propagates through a transmission medium. Although some precautions must be taken for data exchange within a computer, the biggest problems occur when data is transferred to devices outside the computer's circuitry. In this case, distortion and noise can become so severe that information is lost. Data Communications concerns the transmission of digital messages to devices external to the message source. "External" devices are generally thought of as being independently powered circuitry that exists beyond the chassis of a computer...
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...COMP2330 Data Communications and Networking Written Assignment 1 Sample Solutions 1. Which of the OSI layers handles each of the following: (a) Dividing the transmitted bit stream into frames. (b) Determining which route through the subnet to use. (10 marks) Ans: a) Data Link Layer b) Network Layer 2. An image is 1024x768 pixels with 3 bytes/pixel. Assume the image is uncompressed. How long does it take to transmit it over a 56-kbps modem channel? Over a 1-Mbps cable modem? Over a 10-Mbps Ethernet? Over 100-Mbps Ethernet? (10 marks) Ans: The size of the image is 1024 x 768 x 3 x 8 = 18874368 bits. For a 56-kbps modem, it takes 18874368/56000 [pic] 337 seconds. For a 1-Mbps cable modem, it takes 18864368/106 [pic] 18.9 seconds. For a 10-Mbps Ethernet, it takes around 1.89 seconds. For a 100-Mbps Ethernet, it takes around 0.19 seconds. 3. A digital signaling system is required to operate at 9600bps. (10 marks) (a) If a signal element encodes a 4-bit word, what is the minimum required bandwidth of the channel if we assume a noise free system? (b) Repeat part (a) for the case of 8-bit words. Ans: Because we assume noise free, we can use Nyquist’s equation: C = 2B log2M. We have C = 9600 bps (a) log2M = 4, because a signal element...
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... Case Study: Data Communications at Wal-Mart Erin Barraclough Case Study: Data Communications At Wal-Mart • Case Study - Data Communications At WalMart Page 116 1. How has Wal-Mart improved its data communication systems for suppliers? 2. What are some typical data communication applications in Walmart? 3. What are some of the applications of wireless technology in WalMart? 4. What are some of the features and capabilities of VMS? • Due Date Saturday, September 21, 2013 11:59:00 PM CDT (Bidgoli, 2013, p.. Question 1) Wal-Mart has improved its data communication system for its suppliers through various approaches. The main reason for doing so is to, remain the lowest cost retail merchandiser. The first improvement Wal-Mart has done to improve its communication system was adding a customized web site for its suppliers. This customized network has enable suppliers to retrieved, all sales, inventory, and forecasting data through faster connections. To make sure that the confidentiality of data is maintained, Wal-Mart has implemented a security system to ensure that no suppliers can access each other’s data. The second improvement to the data communication system was allowing the suppliers, Web-Based access to Wal-Mart’s Retail Link system to access information in the database. Question 2) Wal-Mart utilizes various data communication system to remain at the top of the retail business. Some typical data communication systems that are available...
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...Determining Databases and Data Communications N/A BIS/320 August 5, 2014 N/A Scenario One The position of a marketing assistant for a consumer electronics company in charge of trade show booth setup can certainly be a challenge. The marketing assistant is responsible for establishing booth setup and tear-down. This position also requires the management and oversight of equipment worth well over a quarter-million dollars. As a marketing assistant, there will have to be steps taken to alleviate or mitigate any issues that may play a role in hindering the success of the goals put in place. Use of a Database or Excel Spreadsheet An Access database or Excel spreadsheet will have to be created featuring fields that can easily be accessed in order to verify information at all times and in detail. The more fields listed, the easier it will be to find a particular part or location and will enable this information to be easily obtained. The list of relevant fields needed to track important data is contained below. . Equipment Company: Name, telephone number, address, and a point of contact Equipment: Name, model, serial number, location, and weight Shipper: Name, telephone number, address, and a point of contact Booth Components: Booth number, name, model, location, height, size, and weight Advantages and Disadvantages of Access As with any product, there are advantages and disadvantages. Here are some of the advantages and disadvantages of using Access according...
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...Active Participation Assignment Data Communication at Wal-Mart Question 1) Wal-Mart has improved its data communication system for its suppliers through various approaches. The main reason for doing so is to, remain the lowest cost retail merchandiser. The first improvement Wal-Mart has done to improve its communication system was adding a customized web site for its suppliers. This customized network has enable suppliers to retrieved, all sales, inventory, and forecasting data through faster connections. To make sure that the confidentiality of data is maintained, Wal-Mart has implemented a security system to ensure that no suppliers can access each other’s data. The second improvement to the data communication system was allowing the suppliers, Web-Based access to Wal-Mart’s Retail Link system to access information in the database. Question 2) Wal-Mart utilizes various data communication system to remain at the top of the retail business. Some typical data communication systems that are available at Wal-Mart are, the automated distribution system, the computerized routing system, and the electronic data interchange (EDI). Question 3) An application for Wal-Mart’s wireless system is to compliment the operations of its warehouse management system (WMS). The Vehicle Management System’s purpose is to track and manage the flow of goods within the distribution centers. Another, application of the wireless system is to control and monitor all forklifts and industrial...
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...Data Communications The 4th Annual Technology Trade Show is slowly approaching. We are preparing to get things in order for the company’s booth. Marketing managers are in the process of determining what displays we will be presenting. The specified equipment will be all of the 2015 models of the T-21. As a marketing manager, I have developed an Excel spreadsheet that will track booth components, equipment, shippers and shipments. The Excel file is named “2015 Trade Booth” located on the company SharePoint site. The excel spreadsheet has five sheets that are labeled with the approximate label. The tab labeled “Events” has all of the information for the Trade Show. This tab has an info form imported from Word that needs to be filled out by all vendors, suppliers, and buyers for the event. Once the form is completed, it should be entered into the 2015 Trade Booth Access program. Entering the vendors, suppliers, and buyers information in the Access program will link information to the equipment, supplies, and shippers and shipment information. Using Access for the database allows the company to store vast amounts of information while importing and exporting files to or from Word, Excel and PowerPoint. One disadvantage with using Access last, was connection problems with Word and Excel, which made it impossible to track data. This year, only one person will enter data and export/import files. Access is a great example of a personal database. A personal database is a DBMS product...
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...Course Outline Course Title: CS065 – Data Communications Course Description This course provides a broad introduction to the fundamentals of data communications and network technology. Emphasis is on more complex aspects of data communications from the perspective of the computer science and information technology in the communication of data, and the interaction of remote systems. Course Objectives ← The objectives of the course are to enable students to: ← Understand and describe time, space, and frequency domains and their applications ← Understand and apply the abstract ISO 7 layer OSI reference model ← Understand and describe other networking models such as TCP/IP, N-ISDN, and ATM. ← Understand and describe circuit, packet switching, frame/cell relay, ATM, WDM, optical networking and newer networking technologies ← Apply mathematical/ analytical skills in basic performance evaluation such as utilization throughput and delay. Course Structure and Contents Module 1: Introduction to Data Communication • Understand and describe time, space, frequency domains application. Module 2: ISO 7 layer OSI reference model • Understand and apply the abstract ISO 7 layer OSI reference model Module3: Other Networking models • Understand and describe other networking models such as TCP/IP, N-ISDN, and ATM. Module4: Network Technologies • Understand and describe circuit, packet switching, frame/cell relay...
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...Question 1: Computer network: A computer network is a group of computer systems and other computing hardware apparatus that are connected together through communication channels to facilitate connection and resource-sharing among a broad range of users. Systems are routinely categorized founded on their characteristics. One example for a computer network was a network of communicating computers that functioned as part of the U.S. military's Semi-Automatic Ground natural environment (SAGE) radar system. In 1969, the University of California at Los Angeles, the Stanford Research organisation, the University of California at Santa Barbara and the University of Utah were attached as part of the advanced study tasks bureau Network (ARPANET) task. It is this network that developed to become what we now call the Internet. Systems are used for the following key causes: To facilitate connection via internet message, video conferencing, instant messaging, etc. To enable multiple users to share a lone hardware device like a copier or scanner To endow document sharing across the network To permit for the distributing of software or functioning programs on remote systems To make data easier to get access to and sustain amidst network users .( R. Morris (10-2001)) Personal area networks (PANs); A Personal area network - PAN - is a computer network coordinated round a one-by-one individual. Personal area systems typically involve a mobile computer, a teli phone and/or a handheld computing...
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...TCP/ IP is the basic communication language for the internet. It can be used in private networks such as the intranet and extranet. Any computer that you send a message to gets a copy of the TCP/IP. TCP/IP is a two layer protocol consisting of transmission control protocol(TCP) and the lower layer Which is Internet protocol which handles addressing so that each packet gets to its destination. TCP will be in control of managing the assembling of a message that Is being sent. IP is responsible for moving packet of data from node to node. IP forwards each packet based on a four byte destination address (the IP number). The Internet authorities assign ranges of numbers to different organizations. The organizations assign groups of their numbers to departments. IP operates on gateway machines that move data from department to organization to region and then around the world. The way that TCP/IP communicate is by using a client/server action in which the client who request and is provided a service. The communication of TCP/IP is really from one point to another meaning that it uses a point to point type of communication. Each user request is considered to be a new request, therefore TCP/IP and its higher-level applications are considered stateless. Being stateless also means that if frees network paths so that everyone can use them continuously. HTTP, Telnet, and SMTP are all associated with TCP/IP as a suite. Protocols related to TCP/IP include the User Datagram Protocol (UDP)...
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...Chapter 1 – Introduction to Data Communications Th is is th e b egin n in g of a cu m u la tive ca s e s tu d y a b ou t a fictit iou s fir m we ca ll Next-Da y Air S er vice (NDAS ). Th e ca s e s t u d y b egin s h er e in Ch a p ter 1 a n d con tin u es th r ou gh ou t th e r es t of th e b ook . It r equ ir es you to com p lete ta s k s th a t a r e r ela ted to top ics cover ed in ea ch cor r es p on d in g ch a p ter of th e text. Th e en d of ea ch ch a p ter con ta in s th e ca s e n a r r a tive, r ela ted figu r es , a n d a s et of qu es tion s a n d p r ob lem s . Th es e d o n ot h a ve on e u n iqu e s olu t ion . Th er e a r e too m a n y a lter n a tives wh en d ea lin g with LANs , WANs , MANs , BNs , a n d th e In ter n et, s o a r ea lis t ic n etwor k d es ign a n d d evelop m en t p rob lem ca n h a ve s evera l wor k a b le a n s wer s . As with a n y r ea l-life p r ob lem with a m b igu ities or u n r es olved con s id er a tion s , you m u s t m a k e you r own a s s u m p tion s . Feel fr ee to r ea d a h ea d or u s e th e in d ex to fin d r ela ted s u b jects th a t s u p p or t you r r ecom m en d a tion s . You r in s tr u ctor m a y p r ovid e a d d ition a l gu id elin es r ega r d in g r ep or t for m a ts , Web a n d lib r a ry r es ou r ces , k ey a s s u m p tion s , a n d th e lik e for th e va r iou s qu es tion s a n d p r ob lem s p r es en ted in th is ca s e s tu d y. Be s u r e to p r ovid e a d equ a te ju s tifica t ion for a n y...
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...by placing one access point on the tenth floor. Will this layout work? Explain. * No because the 5 GHz protocols have a short transmission distance (approximately 30 meters) and this frequency has trouble transmitting through walls and floors. If you wanted to use the IEEE 802.11 a you would need multiple access points which would increase costs. 4. You want to create a local area network that protects the contents of the network server’s hard disks from disk crashes. List all the different techniques for providing this protection that have been presented thus far. * These are all RAID (Redundant Array of Independent Disks) techniques. * RAID 0-Stripping- Data is broken into pieces and each piece stored on different disk drives * RAID 1-Disk Monitoring- Data is...
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...(Ms Word Version attached for better viewing and printing) Networks / Data Communications NTC 360 Lecture Week Three INTRODUCTION Now that we have covered most of the media types available for our networks Protocols that run over the top of the media and the standards they follow, the final topic here is choosing a design of a network by choosing media types and infrastructure that will best suit the needs of the business. INFRASTRUCTURE When to use hubs verses routers and switches is not always a clear-cut decision. In many cases the decision is made due to cost not necessarily best choice. For most office environments a hierarchical design with 10/100/1000 Mbps Ethernet hub/repeaters are adequate. However, there are times when high-speed transfer is worth the cost of installing switches. A good example may be in the motion picture industry where large full motion video clips are developed and edited on computer screens. Due to the size of these kinds of files and the critical nature of time in the industry full duplex switching in the LAN environment may be called for along with Gigabit Ethernet or higher = ). There is an old saying out there that was “route when you can, bridge if you must” This saying still holds true through time. However, switching has for the most part replaced most bridges today. Routing is the best means of isolating and reducing network traffic, which in the end equates to better network performance, however the speeds of...
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