Computer Science MCQ Pratice Test - 9

Computer Science MCQ Pratice Test
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	Hub is a term used with A Star Networks A Ring Networks A Router A Bridge       _____________________________________________________________________________________ When you ping the loopback address, a packet is sent where?  Down through the layers of the IP architecture and then up the layers again Across the wire On the network Through the loopback dongle       _____________________________________________________________________________________ The systems that can be used in both priority and non priority modes is TDM Register insertion Carrier sense system All of these       _____________________________________________________________________________________ A network that requires human intervention to route signals is called a Bus network Ring network Star network T switched network       _____________________________________________________________________________________ Identify the incorrect statement The ATM adoption layer is not service dependent Logical connections in ATM are referred to as virtual channel connections ATM is streamlined protocol with minimal error and flow control capabilities ATM is also known as cell delays       _____________________________________________________________________________________ The secondary device in a multipoint configuration sends data in response to which of the following event? ACK ENQ Poll Sel       _____________________________________________________________________________________ The constellation diagram of BASK has.......dots 2 1 0 None of above       _____________________________________________________________________________________ Which of the following is the simplest error detection method? Parity check Longitudinal Redundancy Checking Checksum Checking Cyclic Redundancy Checking       _____________________________________________________________________________________ The threshold effect in demodulator is exhibited by all demodulator, when the input signal to noise ratio is low. the rapid fall on output signal to noise ratio when the input signal to noise ratio fall below a particular value. the rapid fall on output signal to noise ratio when the input signal to noise ratio fall below a particular value. the property exhibited by correlation receiver.       _____________________________________________________________________________________ The ground station in VSAT communication is called  HTTP Multiplexer Hub Repeater       _____________________________________________________________________________________ Unmodulated signal coming from a transmitter is known as Carrier signal Baseband signal Primary signal None of these       _____________________________________________________________________________________ Which of the following has the smallest default maximum physical receive packet size? ARCnet Ethernet Token ring[4Mbps] Token ring[16Mbps]       _____________________________________________________________________________________ Which of the following TCP/IP protocol is used for the file transfer with minimal capability and minimal overhead? RARP FTP TFTP TELNET       _____________________________________________________________________________________ ASK,PSK,FSK and QAM are examples of....... Digital to digital Digital to analog Analog to analog Analog to digital       _____________________________________________________________________________________ In which circuit switching, delivery of data is delayed because data must be stored and retrieved from RAM ? Space division Time division Virtual Packet       _____________________________________________________________________________________ Mobile IP provides two basic functions Route discovery and registration Agent discovery and registration IP binding and registration None of the above       _____________________________________________________________________________________ Which is reserved address for private networks? 128.0.0.0 to 191.255.255.255 172.16.0.0 to 172.31.255.255 150.0.0.0 to 150.255.255.255 202.40.55.0 to 202.40.55.255       _____________________________________________________________________________________ The cost of the network is usually determined by time complexity switching complexity circuit complexity none of these       _____________________________________________________________________________________ An Internet Service Provider (ISP) has the following chunk of CIDR-based IP addresses available with it: 245.248.128.0/20. The ISP wants to give half of this chunk of addresses to Organization A, and a quarter to Organization B, while retaining the remaining with itself. Which of the following is a valid allocation of addresses to A and B? 245.248.136.0/21 and 245.248.128.0/22 245.248.128.0/21 and 245.248.128.0/22 245.248.132.0/22 and 245.248.132.0/21 245.248.136.0/24 and 245.248.132.0/21       _____________________________________________________________________________________ GSM/CDMA systems are limited to very low speed data are predominantly used for voice are predominantly used for voice all of the above       _____________________________________________________________________________________ The addressing especially used by Transport Layer is  Station address Network address Application port address Dialog address       _____________________________________________________________________________________ In TCP ,a unique sequence number assigned to each Byte Word Segment Message       _____________________________________________________________________________________ What is the size (in terms of bits) of header length field in IPv4 header ? 2 4 8 16       _____________________________________________________________________________________ The baud rate is always equal to the bit transfer rate equal to twice the bandwidth of an ideal channel not equal to the signalling rate equal to half of the bandwidth of an ideal channel       _____________________________________________________________________________________ HDLC is Bit oriented Code dependent  Both a and b above None of the above       _____________________________________________________________________________________ Which of following is not a digital to analog conversion? ASK PSK FSK AM       _____________________________________________________________________________________ What is the maximum operating rate of a wireless LAN using infrared communication ? 1 mbps 2 mbps 3 mbps 4 mbps       _____________________________________________________________________________________ Decryption and encryption of data are the responsibility of which of the following layer ? Physical layer Data Link layer Presentation layer Session layer       _____________________________________________________________________________________ Which of the following switching techniques is most suitable for interactive traffic ? Circuit switching Message switching Packet switching All of the above       _____________________________________________________________________________________ Protection of data from a natural disaster such as a tornado belongs to which of the following network issue? Performance Reliability Security Management        _____________________________________________________________________________________ In communication satellite multiple repeaters are known as Detector Modulator Stations Trasnponders       _____________________________________________________________________________________ Which company develops the TCP/IP protocol for networking? IBM DEC NOVELL DARPA       _____________________________________________________________________________________ A telephone conference call is an example of which type of communications  Same time / same place Same time / different place Different time / different place Different time / same place       _____________________________________________________________________________________ A smart modem can dial, hangup and answer incoming calls automatically. Can you tell who provides the appropriate instructions to the modem for this purpose ? Communication software Error detection protocols Link access procedure (LAP) Telecommunications       _____________________________________________________________________________________ The receiver equalizer reduces delay distortions using  Tapped Delay lines Gearshift Desrambler Difference enging       _____________________________________________________________________________________ Which of the following IP address class is a multicast address ? Class A Class B Class C Class D       _____________________________________________________________________________________ CRC can detect all bursts of upto m errors,if generator polynomial G(x) is of degree One  m-1 m m+1       _____________________________________________________________________________________ Working of the WAH generally involves Telephone lines Micro waves Satellites All of these       _____________________________________________________________________________________ A proxy server is used for which of the following? To provide security against unauthorized users To process client requests for web pages To process client requests for database access To provide TCP/IP       _____________________________________________________________________________________ Which of the following transport layer protocols is used to support electronic mail? SMTP IP TCP UDP       _____________________________________________________________________________________ CDMA Cell uses ________ carriers of 1.25 MHz. 9 18 22 64       _____________________________________________________________________________________ Which of the following is a product of LLC sublayer? 802.3 frame 802.5 frame PDU(Protocol Data Unit) Preamble       _____________________________________________________________________________________ A network that contains multiple hubs is most likely configured in which topology? Mesh Tree Bus Star       _____________________________________________________________________________________ If carrier modulated by a digital bit stream, has one one of the possible phase of 0, 90, 180 and 270 degrees, then modulation called BPSK QPSK QAM MSK       _____________________________________________________________________________________ Adaptive or dynamic directory used in packet routing changes Within each user session With each user session At system generation time only None of these       _____________________________________________________________________________________ Quadrature Amplitude Modulation is combination of ASK and FSK ASK and PSK PSK and FSK None of above       _____________________________________________________________________________________ Which of the following protocol is used for transferring electronic mail messages from one machine to another? FTP SNMP SMTP RPC       _____________________________________________________________________________________ A field in the ethernet message packet is Type Data Address  All of these       _____________________________________________________________________________________ AM and FM are examples of............ conversions. Digital to digital Digital to analog Analog to analog Analog to digital       _____________________________________________________________________________________ Start and stop bits are used in serial communication for Error detection Error correction Synchronization  Slowing down the communication        _____________________________________________________________________________________
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