ISM 6222 Exam 1 Study Guide.docx

ISM 6222 Exam 1 Study Guide.docx - Sender and receiver...

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ISM 6222 Exam 1 Questions Broadband/baseband – 1 question Data communication component- protocol Simplex, half duplex, full duplex- 1 question maybe t/f Delay computing- 3 questions- provide all computations except 1 byte = 8 bit Types of delay- 1 t/f 7 layer OSI model- 2 questions 5 layer Internet model Physical, datalink, network, transport, application Binary computations and conversions Comparison chart- 4/5 questions Static, dynamic, active documents- 1 t/f question Concept: 34 questions (including 16 T/F questions) Chapter 1: 16 questions Chapter 2: 14 questions Chapter 11: 4 questions Computing: 11 questions Binary computing: 5 questions Delay: 3 questions Binary conversion: 3 questions.
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Chapter 1 Internetworking technology : connects different kinds of networks under common standards , enables different technologies to work together Internet: global system of interconnected networks that use standard protocol to serve users worldwide Broadband : analog signal, each transmission assigned to portion of bandwidth ( multiple transitions are possible at the same time), uni-directional Baseband : digital signal, use entire bandwidth of media, bi-directional Telecommunication Data communication : exchange of data between two devices via some form of transmission medium o Devices part of communication system with combination of hardware and software Delivery: must deliver data to correct destination , received by intended user only Accuracy: must deliver data accurately, data altered in transmission are unusable Timeliness: must deliver data in a timely manner, data delivered late are useless Jitter: variation in packet arrival time , uneven delay results in uneven quality Data flow Simplex : unidirectional , one transmits and other receives, use entire capacity of channel to send data in one direction Half -duplex : each can transmit/receive , communication must alternate, one lane road, entire capacity of channel taken over by whichever of two devices is transmitting at the time Full duplex: both can transmit/receive simultaneously , sharing channel capacity by physically separated transmission path or channel division b/w signals traveling in both directions Network: set of devices (nodes) connected by communication media (links) at same time o Node: computer, printer or device capable of sending/receiving data o Link: connecting the devices often called communication channel Network criteria Performance o Measure: Transit time: time required for message to travel from one device to another Response time: elapsed time b/w inquiry and a response o Depends on number of users, type of transmission medium, capabilities of hardware and efficiency of software o Often evaluated by throughput (more, better) and delay (less, better) Reliability o Frequency of failure o Time it takes a link to recover from failure Security
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o Protecting data from unauthorized access/damage , implementing policies for recovery from breaches and data loss Packet delay
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