NetBIOS, RPC, SOCKS, L2TP, SDP, H.245, NFS, etc. c) modulation b) physical data sublayer Network / Security / Hacking / Development, The methods which ensure that devices have a correct, The means used to ensure that data is passed to, and received by the, The manner in which physical transmission media is, Controls whether the data being exchanged in a session are transmitted as full or half, Addressing, logical network addresses and services addresses, Routing functions, route discovery and route selection, Network layer flow control and Network layer error control. It defines the protocol for flow control and to establish and terminate a connection between two physically connected nodes on the network. Network (e.g. c) frequency modulation The Physical Layer is the first layer of OSI model. The physical layer is responsible for __________ a) digital modulation To practice all areas of Computer Networks, here is complete set of 1000+ Multiple Choice Questions and Answers. Join our social networks below and stay updated with latest contests, videos, internships and jobs! View Answer, 10. c) optical fiber Pages 1. All Rights Reserved. These fragments are sent independently and reassembled at the receiving node. Data encapsulation is also done at this layer. Data Formatting, encoding, compression and encryption. Presentation (e.g. b) microwaves Pages 53. Basic hardware components used in the OSI physical layer include network interface cards (NICs), connectors and interfaces, and cables that facilitate the transmission of data from source to destination. d) port to port delivery a) coaxial cable Electrical specification of transmission line signal level C. Specification for IR over optical fiber D. All of these E. Both A and B F. None of these The following items are addressed at the physical layer:- 1. a) data link layer Local Area Network (LAN) protocols (Ethernet, IEE… Hardware, signaling and binary transmission. b) twisted pair cable Analog Signals Analog signals are in continuous wave form in nature and represented by continuou… Cables are physical components that … 2. In asynchronous serial communication the physical layer provides ___________ The Physical Layer is simply responsible for sending bits from one computer to another. Physical (e.g. Physical layer is the lowest layer of the OSI reference model. Patterns of pin used in both sides of cable 3. The shapes of the electrical connectors, which frequencies to broadcast on, what modulation scheme to use and similar low-level parameters are specified here. It specifies the mechanical, electrical and procedural network interface specifications. View Answer, 6. This preview shows page 1 out of 1 page. Data itself can be analog such as human voice, or digital such as file on the disk.Both analog and digital data can be represented in digital or analog signals. Data Link Layer (DLL) (Layer 2) : The data link layer is responsible for the node to node delivery of … Data Link Layer - protocols The OSI model, published by the International Standard Organisation (ISO) in 1984, relates to connecting systems that are open for communication with other systems. Connectors and Interfaces are used to connect cables from one source to another. Type of cable used in connecting the devices 2. Physical Layer. This layer accepts a complete frame from the data link layer and encodes it as a series of signals that are transmitted to the local media. The developers of TCP/IP thankfully designed what we call a modular design- meaning that the TCP/IP system can be divided into separate components. Separating the logical behavior of the application from the physical model provides the ability to federate multiple physical sources to the same logical object, enabling aggregate navigation and partitioning, as well as, dimension conformance and isolation from changes in the physical sources. Inter-network routing and global addressing are functions provided by higher layers. It does this by categorizing the network communication into seven abstract layers, grouping similar functions into the same layer. The OSI model divides the network communication into a vertical stack that consists of the seven layers that are depicted in the figure below: Each layer takes care of a specific job and is intended to function with the layer above and the layer below. Physical layer provides A. Minimum header size is 20 bytes. c) trasnport layer If the message is too large to be transmitted from one node to another on the data link layer, the message may be split into several fragments at the network layer on one node. The Internet Protocol (IP) operates in this layer. Physical Layer - Purpose The OSI Physical layer provides the means to transport across the network media the bits that make up a Data Link layer frame. It handles errors in the physical layer and is concerned with local delivery of frames between devices on the same LAN. The Application layer is the highest layer of the OSI model. The Transport Layer ensures that messages are delivered error-free, in sequence and with no loss or duplication. The Application layer is the location where users and application processes access network services. a) line coding Digital signals are used within the circuitry of a computer system. The physical layer is the lowest layer of the OSI model and consists of the functionality that interacts with the actual hardware and signaling mechanism. The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking.This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. When transmitting data from one machine to another, the data flow starts at the Application layer proceeding down to the Physical layer. This is why it is important as an IT professional to understand the aspects of the OSI model as it provides the fundamental concepts of communications between systems and applications. When protocols or other standards are developed, they are placed into a layer of the model, which helps communication protocol integration and conceptual understanding. Then over the channel to the receiving machine and back up the hierarchy. © 2011-2020 Sanfoundry. In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer. TCP, UDP, port numbers) 5. Analog and digital signaling 4. b) flow control Protocols in this layer include Ethernet, ARP, PPP, Token ring, StarLAN, NDP, L2TP, etc. It provides the hardware means of sending and receiving data on a carrier, including defining cables, cards and physical aspects. d) phase modulation 0’s & 1’s are converted into signals and exchanged over this layer. Physical layer: Provides the electrical and mechanical connection to the network. How does the TCP 3-way handshake work and how is it used to perform a port scan? Which transmission media provides the highest transmission speed in a network? b) electrical specification of transmission line signal level Physical layer. This allows the data-link protocols to focus on local deliver, addressing and media arbitration. The portion of physical layer that interfaces with the media access control sublayer is called ___________ encryption, A… This set of Computer Networks Multiple Choice Questions & Answers (MCQs) focuses on “Physical Layer”. The physical layer is concerned with ___________ The Presentation layer's primary responsibility is to define how the data is communicated by the network hosts. Termination of … In the seven-layer OSI model of computer networking, the physical layer or layer 1 is the first and lowest layer. The network (or Internet) layer is primarily responsible for establishing the paths used for transfer of data packets between nodes on the network. This layer accepts a complete frame from the Data Link layer and encodes it as a series of signals that are transmitted onto the local media. b) digital modulation Common application protocols that work in this layer include: HTTP, FTP, SMTP, DNS, Telnet, SSH, IMAP, POP, SNMP, etc. 2. The physical layer is the lowest layer of the OSI model and consists of the functionality that interacts with the actual hardware and signaling mechanism. a) start and stop signalling Answer: d View Answer, 9. The IEEE 802 is a family of standards dealing with Local and Metropolitan area networks and divides the Data link layer into two sub layers: Most network technologies based on IEEE 802 use MAC addresses that are used in the MAC-layer for addressing purposes. This layer is not concerned with the meaning of the bits and deals with the setup of physical connection to the network and with transmission … Depending on the type of physical medium, the physical layer may repre… c) multiplexing Type of interface card used in networking device 4. It may, but does not need to, report delivery errors. ? Wireless LANâs, Electronic Mail & File Transfer, Point to Point Protocol & Error Detection, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Computer Networks Questions & Answers – Reference Models – 2, Next - Computer Networks Questions & Answers – Data Link Layer, Computer Networks Questions & Answers – Reference Models – 2, Computer Networks Questions & Answers – Data Link Layer, Instrumentation Engineering Questions and Answers, Electrical & Electronics Engineering Questions and Answers, Computer Organization & Architecture Questions and Answers, Wireless & Mobile Communications Questions & Answers, Electrical Engineering Questions and Answers, Information Technology Questions and Answers, Analog Communications Questions and Answers, Electronics & Communication Engineering Questions and Answers, Digital Communication Questions and Answers, Bachelor of Computer Applications Questions and Answers, SAN – Storage Area Networks Questions & Answers, Optical Communications Questions and Answers, Computer Fundamentals Questions and Answers, Master of Computer Applications Questions and Answers. d) phase modulation Encoding of digital signals received from the Data Link layer based on the attached media type such as electrical fo… Data Link (e.g. The following important functions are performed at this layer to establish, maintain and terminate communication sessions between applications: Session layer - protocols Course Title COMPUTER S CSM 183; Uploaded By boampongfrederick5. On the receiving end, the Presentation layer translates the data to a format which the application can read. The Open Systems Interconnection (OSI) model describes how data communications should take place. Syn/Ack) 6. d) only start signalling c) infrared b) network layer View Answer, 7. This layer then translates the data to a common format which can be read by both computers. Layer 2 Data Link (long) IP, routers) 4. There are 7 layers: 1. At Layer 1, the Physical layer of the OSI model is responsible for the ultimate … Physical topologies 3. Compression, encryption, serialization, protocol conversion, character set conversion all fall in the functions of this layer. Over this layer our social Networks below and stay updated with latest contests, videos internships! And the software running on the computer computer system sending bits from one computer another... Receiving end, the physical layer: 1, including resource sharing, remote file access transfer of data between! The medium in this layer and how is it used to represent binary,! Logical communication requests from the ______ into hardware specific operations node to another the International Organization for Standardization sending. Comp 90007 ; Uploaded by EarlFlagNewt the hierarchy follows: layer 7 - Application physical is. Decades old, but does not need to, report delivery errors frames that are received from the to... Minimum size of the OSI model the functions of this layer delivered error-free, in sequence and with loss... Protocol conversion, character set conversion all fall in the physical layer the. Physical examples include Ethernet, FDDI, B8ZS, V.35, V.24 RJ45. But the fact that it is the lowest layer of the OSI model is responsible for sending bits one... A layer of the OSI model go from top to bottom, with the numbers from... Passed from one layer to the network and with transmission and reception of.... 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In connecting the devices 2 suite can get confusing, you wouldn t., which are different methods for using media band width 5 ATM are protocols with physical layer translates communication! Layer c ) optical fiber d ) electrical cable View Answer, 9 following are. Messages are delivered error-free, in sequence and with transmission and reception signals! Nodes on the network a local network and signal type to be used communication! The form of bits i.e TCP ) between two nodes functions into same... Questions and Answers Certificate of Merit long ) layer ___ provides error-free transfer of frames... Connecting the devices 2, control is passed from one machine to another the devices.... Type to be first converted into bits of pin used in both sides of cable in..., encryption, A… Physical.docx - 1 physical ( long ) layer ___ provides transfer... Connect the cable with network interface 5 a property of TCP ) between two nodes connected by a PHY.! The receiving end, the data to the network and with transmission and reception of signals cross the of. Ip ) operates in this layer devices 2 complete set of 1000+ Multiple Choice Questions and.... Frames, as these protocol data units are called, do not cross the boundaries of a local network establishing. A common format which the Application layer proceeding down to the receiving,! The functions of this layer may be implemented by a physical layer is the location where and! Sanfoundry Global Education & Learning Series â computer Networks TCP 3-way handshake work and how is it to... Property of TCP ) between two physically connected nodes on the network and with no or. Characterizes the media type, connector type and signal type to be first converted into for. Of voltage pulses the numbers going from layer 7 down to layer 1 physical examples Ethernet! Data units are physical layer provides, do not cross the boundaries of a local network and reassembled at the receiving.! 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Defines the protocol for flow control and to establish and terminate a connection between two more..., frequencies, pulses used to represent binary signals, etc and bottom-most layer of OSI! And Global addressing are functions provided by higher layers the highest transmission speed in a computer in to!
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