Computer Networks · Unit 2 · 4 hrs
Physical Layer and Network Media
Exam-focused notes for Physical Layer and Network Media (Computer Networks, CSC263): what the TU syllabus asks and how it has actually been tested, with 8 solved past questions from this unit.
What this unit covers
- Network Devices: Repeater, Hub, Switch, Bridge, Router
- Different types of transmission medias (wired: twisted pair, coaxial, fiber optic, Wireless: Radio waves, micro waves, infrared)
- Ethernet Cable Standards (UTP & Fiber cable standards)
- Circuit, Message & Packet Switching
- ISDN: Interface and Standards
Different types of transmission medias
Explain any two wireless transmission media. [5]
Wireless (unguided) media refers to transmission media where no physical medium is required for the transmission of electromagnetic signals. The signal is broadcasted through air and is used for larger distances, though it is considered less secure than wir...
Full solved answer →What is transmission media? How do guided media differ from unguided media? Explain different types of guided media in detail.[10]
Transmission media are the means by which a communication signal is carried from one system to another. They form the physical path between the sender and the receiver in a communication system. Broadly, transmission media are classified into two major cate...
Full solved answer →Define transmission media. What are different types of transmission media. Explain different types of unguided media in detail.[10]
--- Transmission media are the means by which a communication signal is carried from one system to another. In other words, it is the physical or wireless path through which data travels from a sender to a receiver in a network. --- Transmission media are b...
Full solved answer →Circuit, Message & Packet Switching
What do you understand by packet switching? Explain. What are its advantages and disadvantages? [5]
Packet switching is a data transmission technique in which the data to be sent is broken down into smaller units called packets. These packets are individually routed through the network from source to destination. At the destination, the receiving device c...
Full solved answer →What is circuit-switched network? Explain phases during communication in a circuit-switched network? [5]
A circuit-switched network is a type of network in which a dedicated communication path (channel) is established between the sender and receiver before data transmission begins. This dedicated path remains open and reserved exclusively for the two communica...
Full solved answer →What is switching? Compare and contrast a circuit-switched network and packet-switched network. [5]
Switching is the mechanism used at the network layer to determine the best logical path for data transfer between nodes. It manages how data is routed and forwarded from a source to a destination across a network. The network layer is concerned with three m...
Full solved answer →What do you understand by circuit switching? Explain. What are its advantage and disadvantage? [5]
Circuit switching is a switching technique that establishes a dedicated path or channel between the sender and receiver before data transmission begins. Once this dedicated path is established, it remains open and reserved exclusively for the two communicat...
Full solved answer →Network Devices
Write short notes on (any two): a. Connection-oriented service b. Bridge c. Hamming distance [5]
--- Connection-oriented service is a type of network service that establishes an end-to-end connection between the sender and receiver before any data is transmitted over the network. - It is related to the telephone system model of communication. - It uses...
Full solved answer →Make Unit 2 stick
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