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All computer network Interview Questions
31.What are the different types of multiplexing?
Ans: Multiplexing is of three types. Frequency division multiplexing and wave division multiplexing is for analog signals and time division multiplexing is for digital signals.
32.What is FDM?
Ans: In frequency division multiplexing each signal modulates a different carrier frequency. The modulated carrier combines to form a new signal that is then sent across the link.
Here multiplexers modulate and combine the signal while demultiplexers decompose and demodulate.
Guard bands keep the modulating signal from overlapping and interfering with one another.
32.What is TDM ?
Ans: In TDM digital signals from n devices are interleaved with one another, forming a frame of data.
Framing bits allow the TDM multiplexer to synchronize properly.
33.What are the different transmission media?
Ans: The transmission media is broadly categorized into two types
i)Guided media(wired)
i)Unguided media(wireless)
34.What are the different Guided Media?
Ans: The media which provides a conduct from one device to another is called a guided media. These include twisted pair cable, coaxial cable, and fiber-optic cable.
35.Describe about the different Guided Medias.
Ans: Twisted pair cable consists of two insulated cupper wires twisted together. It is used in telephone line for voice and data communications.
Coaxial cable has the following layers: a metallic rod-shaped inner conductor, an insulator covering the rod, a metallic outer conductor (shield), an insulator covering the shield, and a plastic cover.Coaxial cable can carry signals of higher frequency ranges than twisted-pair cable.
Coaxial cable is used in cable TV networks and Ethernet LANs.Fiber-optic cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outer jacket.Fiber-optic cables carry data signals in the form of light. The signal is propagated along the inner core by reflection. Its features are noise resistance, low attenuation, and high bandwidth capabilities.
It is used in backbone networks, cable TV nerworks, and fast Ethernet networks.
36.What do you mean by wireless communication?
Ans: Unguided media transport electromagnetic waves without using a physical conductor. This type of communication is referred as wireless communication.
Here signals are broadcaster through air and thus available to anyone who has a device to receive it.
37.What do you mean by switching?
Ans: It is a method in which communication devices are connected to one another efficiently.
A switch is intermediary hardware or software that links devices together temporarily.
38.What are the switching methods?
Ans: There are three fundamental switching methods: circuit switching, packet switching,
And message switching.In circuit switching, a direct physical connection between two devices is created by space division switches, time division switches or both.
In packet switching data is transmitted using a packet switched network. Packet switched network is a network in which data are transmitted in independent units called packets.
39.What are the duties of data link layer?
Ans: Data link layer is responsible for carrying packets from one hop (computer or router) to the next. The duties of data link layer include packetizing, adderssing, error control, flow control, medium access control.
40.What are the types of errors?
Ans: Errors can be categorized as a single-bit error or burst error. A single bit error has one bit error per data unit. A burst error has two or more bits errors per data unit.
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