Computer Network Solved MCQs - Part 2

Which of the following does not allow multiple users or devices to share one communications line?  Doubleplexer Multipplexer Concentrator Controller       _____________________________________________________________________________________ Which of the following best illustrates the default subnet mask for a class A,B, and C Network  0.0.0.0, 0.0.0.1, 0.0.1.1 255.255.255.0, 255.255.0.0, 255.0.0.0 255.0.0.0, 255.255.0.0, 255.255.255.0 255.255.0.0, 255.255.255.0, 255.255.255.255       _____________________________________________________________________________________ MTU is specified by  IP Datagram size Hardware technology TCP Segment size None of the above       _____________________________________________________________________________________ In which congestion control policy the router can discard less sensitive packets when congestion is likely to happen? Discarding policy Acknowledgement policy Window policy Retransmission policy       _____________________________________________________________________________________ Which of the following TCP/IP protocol allows an application program on one machine to send a datagram to an application program on another machine?  UDP VMTP X.25 SMTP       _____________________________________________________________________________________ In an IPv4 datagram, the M bit is 0, the value of HLEN is 10, the value of total length is 400 and the fragment offset value is 300. The position of the datagram, the sequence numbers of the first and the last bytes of the payload, respectively are Last fragment, 2400 and 2789 First fragment, 2400 and 2759 Last fragment, 2400 and 2759 Middle fragment, 300 and 689       _____________________________________________________________________________________ The value of N(S) is related to the value of P(S) as N(S)-P(S)=number of outstanding packets N(S)-P(S)=number of outstanding frames N(S)-P(S)=number of active logical channels in the link They are not related       _____________________________________________________________________________________ Which of following divides the high speeds signals into frequency bands? T-switch Time division multiplexer Frequency division multiplexer Modem       _____________________________________________________________________________________ Using data p=3, q=11, n=pq, d=7 in RSA algorithm find the cipher text of the given plain text SUZANNE BUTAEEZ SUZANNE XYZABCD ABCDXYZ       _____________________________________________________________________________________ Which channel is deployed by the radio station for transmission? Half duplex Full duplex Simplex channel None of the above       _____________________________________________________________________________________ Match the following with link quality measurement and handoff initiation : (a) Networked-Controlled Handoff(NCHO)    (i) MS connect to BS (b) Mobile-Assisted Handoff(MAHO)            (ii) Process via channel the target BS (c) Forward Handoff                                        (iii) First Generation Analog Cellular System (d) Hard Handoff                                             (iv) Second Generation Digital Cellular System (iii)  (iv)  (ii)  (i) (ii)  (iii)  (i)  (iv) (ii)  (i)   (iv)  (iii) (iv)  (iii)  (i)  (ii)       _____________________________________________________________________________________ To prevent signal alternation ,what is the maximum number of repeaters that can be placed on one 10 Base 5 or 10 Base 2 network? Four Five Three Any number       _____________________________________________________________________________________ Who strips the data frame from the token ring network? Destination station The first station which wants to transmit next The sending station The station next to the destination station       _____________________________________________________________________________________ ATM is an example of  Ring topology Star topology Bus topology None of the above       _____________________________________________________________________________________ FDM devices can operate On multipoint analog data channels More efficiently than dumb TDMs More efficiently than smart TDMs Like modern sharing devices       _____________________________________________________________________________________ .......uses two carriers one in phase and the other quadrature? ASK PSK FSK QAM       _____________________________________________________________________________________ The research and development department at your office has been experimenting with different technologies to help improve the performance of the network. One group has been examining the use of a broadband network versus a based band network. Select the correct statement about broadband and baseband.  Broadband networks carry several channels on a single cable, whereas in a baseband network several cables carry one channel Baseband networks carry a single channel on a single cable, whereas broadband networks carry several channels on a single cable Baseband refers to local area networks, and broadband refers to wide area networks. Baseband operates at a standard bit rate, whereas broadband may operate at different rates as needed       _____________________________________________________________________________________ Error detection at a data link level is achieved by  Bit stuffing Cyclic redundancy codes Hamming codes Equalization       _____________________________________________________________________________________ Which of the following TCP/IP protocol is used for transferring electronic mail messages from one machine to another?  POP SMTP FTP HTTP       _____________________________________________________________________________________ Which of the following device is used to connect two systems, especially if the systems use different protocols?  Hub Bridge Gateway Repeater       _____________________________________________________________________________________ What is the maximum window size in sliding window protocol used in a computer network ? 4 8 15 16       _____________________________________________________________________________________ You have a class A network address 10.0.0.0 with 40 subnets, but are required to add 60 new subnets very soon. You would like to still allow for the largest possible number of host IDs per subnet. Which subnet mask should you assign?  255.254.0.0 255.240.0.0 255.248.0.0 255.252.0.0       _____________________________________________________________________________________ Frames from one LAN can be transmitted to another LAN via the device  Router Bridge Repeater Modem       _____________________________________________________________________________________ The receiver equalizer reduces delay distortions using Tapped Delay lines Gearshift Desrambler Difference enging       _____________________________________________________________________________________ The device which connects dissimilar LANs of different topologies using different sets of communication protocols so that information can flow from one to another is called Router Bridge Gateway Switch       _____________________________________________________________________________________ The _____ houses the switches in token ring  Transceiver Nine-pin connector MAU NIC       _____________________________________________________________________________________ IEEE 802.3 popularly called Switch Ethernet Ethernet Wifi Wireless Network       _____________________________________________________________________________________ In IPv4 header, the ______ field is needed to allow the destination host to determine which datagram a newly arrived fragments belongs to. identification fragment offset time to live header checksum       _____________________________________________________________________________________ In token ring ,the tokens can be removed by The nearest down stream neighbour The receiving station The ring monitor The nearest upstream neighbor       _____________________________________________________________________________________ Which of the following field of the TCP header tells how many bytes may be sent starting at the byte acknowledged ? TCP header length Window size Acknowledgement number Urgent pointer       _____________________________________________________________________________________ 802.11i standard included an encryption scheme is known as Wireless Security WEP (Wired Equivalent Privacy) WiFi Protected Access WiFi Protected Protocol       _____________________________________________________________________________________ Error rate is  An error-detecting code based on a summation operation performed on the bits to be checked. A check bit appended to an array of binary digits to make the sum of all the binary digits. a code in which each expression conforms to Specific rules of construction, so that if certain errors occur in an expression, the resulting expression will not conform to the rules of construction and thus the presence of the errors is detected The ratio of the number of data units in error to the total number of data units       _____________________________________________________________________________________ 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       _____________________________________________________________________________________ An error-detecting code inserted as a field in a block of data to be transmitted is known as  Frame check sequence Error detecting code Checksum Flow control       _____________________________________________________________________________________ ICMP (Internet Control Message Protocol) is  A TCP/IP protocol used to dynamically bind a high level IP Address to a low-level physical hardware address a TCP/IP high level protocol for transferring files from one machine to anothe a protocol used to monitor computers a protocol that handles error and control messages       _____________________________________________________________________________________ Maximum speed of LAN(Local Area Network) Up to 5 Gbps Up to 3 Gbps Up to 10 Gbps Up to 15 Gbps       _____________________________________________________________________________________ In classful addressing, the IP address 190.255.254.254 belongs to Class A Class B Class C Class D       _____________________________________________________________________________________ Radio signals generally propagate according to the following mechanisms Modulation, Amplification, Scattering Reflection, Diffraction, Scattering Amplification, Diffraction, Modulation Reflection, Amplification, Diffraction       _____________________________________________________________________________________ The unlicensed National Information Infrastructure band operates at the _________ frequency 2.4 GHz 5 GHz 33 MHz 5 MHz       _____________________________________________________________________________________ The addressing especially used by Transport Layer is  Station address Network address Application port address Dialog address       _____________________________________________________________________________________ 802.11g standard running speed is Up to 11 Mbps Up to 54 Mbps Up to 450 Mbps Up to 2 Mbps       _____________________________________________________________________________________ In ATM which facility support multimedia applications that require minimal delays? Constant bit rate Unspecified bit rate Avail bit rate Realtime bit rate       _____________________________________________________________________________________ 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 count-to-infinity problem is associated with Flooding algorithm Hierarchical routing algorithm Distance vector routing algorithm Link state routing algorithm       _____________________________________________________________________________________ For the transmission of the signal, Bluetooth wireless technology uses time division multiplexing frequency division multiplexing time division duplex frequency division duplex       _____________________________________________________________________________________ Brouter Is a type of bridge Works at all the layers of OSI model Is able to bridge those protocols that are not routable None of the above       _____________________________________________________________________________________ Which channel of transmission is used in a telephone call? Simplex Half duplex Full duplex None of the above       _____________________________________________________________________________________ X.25 is ________ Network Connection Oriented Network Connection Less Network Either Connection Oriented or Connection Less Neither Connection Oriented nor Connection Less       _____________________________________________________________________________________ IEEE 802.16 standard for Wireless LAN (WiFi) Broadband wireless Personal Area Network Wireless Regional Area Network       _____________________________________________________________________________________ The single stage network is also called one sided network two sided network recirculating network pipeline network