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问题 English 答案 English
What are two reasons for using a layered structure?
开始学习
1. it prevents technology from different layers to affect each other. 2-reduces complexity
Discuss two possible disadvantages of a layerd structure.
开始学习
-doesent define any particular protocol, -exchange between two layers can require archtecture changes, -monolitic design can be more efficient
Explain the difference between PDU and SDU.
开始学习
PDU (protocol data units) is used to exchange informaton between layers, SDU(Service data unit) is the payload section in PDU
Describe the purpose of SAPs.
开始学习
application interface between the layers N+1 and N to exchange service primitives
advantages and disadvantages of OSI
开始学习
generic model, supports connectionless and conection oriented services, changes at one layer do not affect the others/// dis: very complex, duplication of services in different layers, purely a theorethical model
adv and disadvn of TCP/IP
开始学习
industry standard model, interoperable, scalable client=oriented architecture///// dis: not generic in nature but rather protocol dependend, not optimized for small networks, does not distinghuish phisical layers and data link layers
hamming code: how many bits can be detected and how manye can be corrected
开始学习
detected: double bit errors/// corrected: al single bit errors with log(m) extra bits
Finit State Machine (FSM)
开始学习
it is a mathematical model of computation, an abstract machine that can eb at exactly one out of finite state at any given time///
FSM key points
开始学习
key points: fixed set of states, one state at a time, a sequence of inputs is sent to the machine, every state has a set of transitions and every transition is associated with an input and pointing to a state

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