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 The Open System Interconnection (OSI) Model is a conceptual and logical layout that defines network communication used by systems open to interconnection and communication with other systems. The model is broken into seven sub-components, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven layer OSI Model or the seven layer model.  The Seven layers of OSI model are : Physical Layer Data Link Layer Network Layer Transport Layer Session Layer Presentation Layer Application Layer 1. Physical Layer    The physical layer, the lowest layer of the OSI model, is concerned with the transmission and reception of the  unstructured raw bit stream over a physical medium. It describes the electrical/optical, mechanical, and functiona...

 a. LAN : Local Area Network b. MAN : Metropolitan Area Network c. WAN : Wide Area Network d. Wi-Fi : Wireless Fidelity e. NIC: Network Interface Card f. VoIP : Voice Over Internet Protocol g. UTP : Unshielded Twisted Pair h. Modem : Modulator Demodulator i. PPP : Point to Point Protocol j. NOS: Network Operating System k. SMTP : Simple Mail Transfer Protocol l. IMAP : Internet Message Access Protocol m. NNTP : Network News Transfer Protocol n. NetBEUI: Network Bios extended User Interface o. NCP : Network Control Protocol p. BNC: British Naval Connector/Bayonet Naur Connector q. GPS :   Global Positioning System r. MAC:  Media Access Control p. OFDM : Orthogonal Frequency Division Multiplexing q. STP : Shielded Twisted Pair r. SMTP : Simple Mail Transfer Protocol s. FTP : File Transger Protocol t. HTTP : HyperText Transfer Protocol u. POP : Post Office Protocol v. IPX/SPX : Internetwork Packet eXchange/Sequence Packet eXchange w. Mbps : Mega bits per second

 a. The mode of transmission in which communication takes place from both the sides simultaneously.                       ans : Full Duplex mode of Communication b. A computer network limited within a room .                       ans: PAN(Personal Area Network) c. The interconnection between two or more computers through physical and logical components to share resources.                       ans:Computer Networks d. The set of rules and procedures that makes the communication possible among different computers in network.                        ans: Protocols e. ...

 a. What is communication? From which word is it derived?        ans : Communications is the exchange of information between two or more things, such as people, devices, governments, organizations, or businesses. In digital communication, data is exchanged between two or more computing devices. This data communication ( datacom ) occurs over a communication medium, such as a telephone line, fiber optic cable, or wireless radio signal. The collection of digital devices and their connection media is a computer network and is what allows devices to "talk" to each other. The word communication is derived from communis (Latin) which means common. Communis is noun word, which means common, communiality or sharing. Similarly, communicare is a verb, which means 'make something common'.    b. What is data transmission mode? List different types of data transmission modes.        ans : Data communication is the transmiss...

 a.  i. Computer Network------------------->  Resource sharing ii. Network OS ---------------------------> Windows NT iii. Transmission Channel ------------------> UTP iv. Protocol -----------------------------------> HTTP b. i.  Wifi----------------------------------------> Transmission Media ii.  Linear Bus ------------------------------> Topology iii. BNC ------------------------------------> Media Connector iv. Device Driver ---------------------------> Software Component

 1. Which of the following acts as the central authority in the network? Protocol Client Server None of the above               Ans: Server 2. Which of the following is not media converter? BNC Terminator RJ-45 NIC               Ans : NIC 3. In which of the following network model all the computers have equal access? Peer-to-Peer Network Apple talk Network Client/Server Network None of the above               Ans: Peer-to-peer network 4.  Which is an inter-networking device that connects two dissimilar networks? Bridge Gateway Switch Router     Ans: Gateway  5. Which of the following device is multiports repeater? Hub router bridge gateway          Ans : Router 6. Which of the following is not a protocol? TCP/IP IPX/SPX NETBIOS/NETBUI Client          Ans: Client 7. Which...

a. Communication is the process of sharing message from one point to another.   True b. In half duplex mode of communication, data can be transmitted in both the directions simultaneously. False c. Metropolitan Area Network connects two or more LAN together with in a large city or state.  True d. Computer network allows sharing of software only. False e. Coaxial cable has much greater bandwidth than fiber optic cable. False f. A gateway is a network device which connects two dissimilar networks together. True g. Each computer or device in a network is called node. True h. Peer to peer is a network which has more security than client server. False