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CS6551 – COMPUTER NETWORKS (Regulation 2013) Time: Three Hours Maximum : 100 Marks Answer ALL Questions PART a ( 10 ×2 = 20 Marks)

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CS6551 – COMPUTER NETWORKS (Regulation 2013) Time: Three Hours Maximum : 100 Marks Answer ALL Questions PART a ( 10 ×2 = 20 Marks) JEPPIAAR ENGINEERING COLLEGE DEPARTMENT OF ELECTRONICS AND COMMUNICATION ENGINEERING EC6757-TOTAL QUALITY MANAGEMENT QUESTION BANK VIII SEMESTER ECE BATCH 2014-2018 Prepared By Dr.S.K.Padmanabhan Asso.Prof/ECE JEPPIAAR ENGINEERING COLLEGE DEPARTMENT OF ECE VISION OF INSTITUTION To build Jeppiaar Engineering College as an institution of academic excellence in technological and management education to become a world class University. MISSION OF INSTITUTION To excel in teaching and learning, research and innovation by promoting the principles of scientific analysis and creative thinking. To participate in the production, development and dissemination of knowledge and interact with national and international communities. To equip students with values, ethics and life skills needed to enrich their lives and enable them to meaningfully contribute to the progress of society. To prepare students for higher studies and lifelong learning, enrich them with the practical and entrepreneurial skills necessary to excel as future professionals and contribute to Nation‟s economy PROGRAM OUTCOMES (POs) Engineering Knowledge: Apply the knowledge of mathematics, science, engineering PO1 fundamentals, and electronics engineering specialization to the solution of complex engineering problems. Problem analysis: Identify, formulate, review research literature, and analyze complex PO2 engineering problems reaching substantiated conclusions using first principles of mathematics, natural sciences, and engineering sciences. Design/development of solutions: Design solutions for complex engineering problems and design system components or processes that meet the specified needs with appropriate PO3 consideration for the public health and safety, and the cultural, societal, and environmental considerations. Conduct investigations of complex problems: Use research-based knowledge and research PO4 methods including design of experiments, analysis and interpretation of data, and synthesis of the information to provide valid conclusions. Modern tool usage: Create, select, and apply appropriate techniques, resources, and modern PO5 engineering and IT tools including prediction and modeling to complex engineering activities with an understanding of the limitations. The engineer and society: Apply reasoning informed by the contextual knowledge to assess PO6 societal, health, safety, legal and cultural issues and the consequent responsibilities relevant to the professional engineering practice. Environment and sustainability: Understand the impact of the professional engineering PO7 solutions in societal and environmental contexts, and demonstrate the knowledge of, and need for sustainable development. Ethics: Apply ethical principles and commit to professional ethics and responsibilities and PO8 norms of the engineering practice. Individual and team work: Function effectively as an individual, and as a member or leader in PO9 diverse teams, and in multidisciplinary settings. Communication: Communicate effectively on complex engineering activities with the engineering community and with society at large, such as, being able to comprehend and write PO10 effective reports and design documentation, make effective presentations, and give and receive clear instructions. Project management and finance: Demonstrate knowledge and understanding of the PO11 engineering and management principles and apply these to one‟s own work, as a member and leader in a team, to manage projects and in multidisciplinary environments. Life-long learning: Recognize the need for, and have the preparation and ability to engage in PO12 independent and life-long learning in the broadest context of technological change. VISION&MISSION, PEO & PSO OF THE DEPARTMENT VISION OF ECE DEPT To become a centre of excellence to provide quality education and produce creative engineers in the field of Electronics and Communication Engineering to excel at international level. MISSION OF ECE DEPT M1 Inculcate creative thinking and zeal for research to excel in teaching-learning process. M2 Create and disseminate technical knowledge in collaboration with industries. Provide ethical and value based education by promoting activities for the betterment of the M3 society. Encourage higher studies, employability skills, entrepreneurship and research to produce M4 efficient professionals thereby adding value to the nation‟s economy. PEO of ECE DEPT Produce technically competent graduates with a solid foundation in the field of Electronics PEO I and Communication Engineering with the ability to analyze, design, develop, and implement electronic systems. Motivate the students for successful career choices in both public and private sectors by PEO II imparting professional development activities. PEO Inculcate in the students‟ ethical values, effective communication skills and develop the III ability to integrate engineering skills to broader social needs. Impart professional competence, desire for lifelong learning and leadership skills in the PEO IV field of Electronics and Communication Engineering. PSO of ECE DEPT Competence in using modern electronic tools in hardware and software co-design for PSO I networking and communication applications. Promote excellence in professional career and higher education by gaining knowledge in PSO II the field of Electronics and Communication Engineering Understand social needs and environmental concerns with ethical responsibility to become PSO III a successful professional. UNIT I FUNDAMENTALS & LINK LAYER : Building a network – Requirements - Layering and protocols - Internet Architecture – Network software – Performance ; Link layer Services - Framing - Error Detection - Flow control PART A 1. What are the two types of line configuration? NOV/DEC 2010 Line configuration refers to the way two or more communication devices attached to a link. Line configuration is also referred to as connection. There are two possible types of line configurations or connections. Point-to-point connection Multipoint connection 2. Group the OSI layers by function?(NOV/DEC 2013) The seven layers of the OSI model belonging to three subgroups. Physical, data link and network layers are the network support layers; they deal with the physical aspects of moving data from one device to another. Session, presentation and application layers are the user support layers; they allow interoperability among unrelated software systems. The transport layer ensures end-to-end reliable data transmission. 3. What are the three criteria necessary for an effective and efficient network? The most important criteria are performance, reliability and security. Performance of the network depends on number of users, type of transmission medium, and the capabilities of the connected h/w and the efficiency of the s/w. Reliability is measured by frequency of failure, the time it takes a link to recover from the failure and the network‟s robustness in a catastrophe. Security issues include protecting data from unauthorized access and viruses. 4. What are the two interfaces provided by protocols? Service interface Peer interface Service interface- defines the operations that local objects can perform on the protocol. Peer interface- defines the form and meaning of messages exchanged between protocol peers to implement the communication service. 5. What is OSI? A standard that specifies a conceptual model called Open systems Interconnection network interface model, which breaks networked communications into seven layers: Application, Presentation, Session, Transport, Network, Data link, Physical. 6. Why protocols needed? In networks, communication occurs between the entities in different systems. Two entities cannot just send bit streams to each other and expect to be understood. For communication, the entities must agree on a protocol. A protocol is a set of rules that govern data communication. 7. What are header and trailers and how do they get added and removed? Each layer in the sending machine adds its own information to the message it receives from the layer just above it and passes the whole package to the layer just below it. This information is added in the form of headers or trailers. Headers are added to the message at the layers 6,5,4,3, and 2. A trailer is added at layer2. At the receiving machine, the headers or trailers attached to the data unit at the corresponding sending layers are removed, and actions appropriate to that layer are taken. 8. Mention the different physical media? Twisted pair. Coaxial cable. Optical fiber. 9. What are the issues in data link layer? NOV/DEC 2012 Specific responsibilities of data link layer include the following. a) Framing b) Physical addressing c) Flow control d) Error control e) Access control. 10. Write short notes on error correction? NOV/DEC 2011 It is the mechanism to correct the errors and it can be handled in 2 ways. When an error is discovered, the receiver can have the sender retransmit the entire data unit. A receiver can use an error correcting coder, which automatically corrects certain errors. 11. Define Signals? Signals are actually electromagnetic waves traveling at the speed of light. The speed of light is, however, medium dependent-electromagnetic waves traveling through copper and fiber do so at about two-thirds the speed of light in vacuum. 12. Define flow control? NOV/DEC 2011,APR/MAY 2015 Flow control refers to a set of procedures used to restrict the amount of data. The sender can send before waiting for acknowledgment. 13. What do you
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