Description : Which of the following is the multiple access protocol for channel access control? A. CSMA/CD B. CSMA/CA C. Both CSMA/CD & CSMA/CA D. HDLC
Last Answer : C. Both CSMA/CD & CSMA/CA
Description : Which protocols adopted the standards of HDLC (High Level Link Control) protocol? a. X.25 protocol as LAPB (Link Access Procedure Balanced, V.42 protocol as LAPM (Link Access Procedure for ... Services Digital Network) protocol as LAPD (Link Access Procedure on D channel) d. All the above
Last Answer : d. All the above
Description : In IEEE 802.11, the access method used in the DCF sublayer is _________. A) ALOHA B) CSMA/CA C) CSMA/CD D) none of the above
Last Answer : CSMA/CA
Description : In_______, collisions are avoidedthrough theuse of three strategies: the interframe space, the contention window,and acknowledgments. A) CSMA/CA B) CSMA/CD C) either (a)or (b) D) both (a) and (b)
Description : Toavoid collisions on wireless networks, ________was invented. A) CSMA/CA B) CSMA/CD C) either (a)or (b) D) both (a) and (b)
Description : In ________,a station monitors the medium after it sends a frame to see if the transmission was successful. If so, the station is finished. If, however, there is a collision, the frameis sentagain. A) CSMA/CA B) CSMA/CD C) either (a)or (b) D) both (a) and (b)
Last Answer : CSMA/CD
Description : __________ augments the CSMA algorithm todetect collision. A) CSMA/CA B) CSMA/CD C) either (a)or (b) D) both (a) and (b
Description : In _______, collisions are avoided through the use of three strategies: the interframe space, the contention window, and acknowledgments. A. CSMA/CA B. CSMA/CD C. either (a) or (b) D. both (a) and (b)
Last Answer : A. CSMA/CA
Description : Which of the following statements is TRUE about CSMA/CD a. IEEE 802.11 wireless LAN runs CSMA/CD protocol b. Ethernet is not based on CSMA/CD protocol c. CSMA/CD is not suitable for a high propagation delay network like satellite network d. There is no contention in a CSMA/CD network
Last Answer : CSMA/CD is not suitable for a high propagation delay
Description : Explain CSMA/CD and CSMA/CA.
Last Answer : CSMA- resolving the media contention. Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Listen for Data Transmission on Cable (Carrier Sense) When Medium is free a) Transmit ... time, and transmit again. Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) Nov/Dec
Description : The _____sublayer is responsible for the operation of the CSMA/CD access method and framing. A) LLC B) MII C) MAC D) none of the above
Last Answer : MAC
Description : The IEEE 802.3 Standard defines _________ CSMA/CD as the access method for first-generation 10-Mbps Ethernet. A) 1-persistent B) p-persistent C) non-persistent D) none of the above
Last Answer : 1-persistent
Description : In Ethernet CSMA/CD, the special bit sequence transmitted by media access management to handle collision is called a. Preamble b. Postamble c. Jam d. None of the above
Last Answer : c. Jam
Description : Explain the terms topology and access methods used in LANs. Discuss the CSMA/CD and CSMA/CA protocols.
Last Answer : (i) LAN topologies: Network topology is a physical schematic which shows interconnection of the many users. There are four basic topologies as under: (a) Direct Connection or one to all ... it is free, the station transmits, and waits for an acknowledgment signal that the packet was received
Description : High-level Data Link Control (HDLC) is a _______ protocol for communication over point-to-pointand multipoint links. A) bit-oriented B) byte-oriented C) character-oriented D) none of the above
Last Answer : bit-oriented
Description : Choose the Protocols working in the Data Link Control Layer of OSI model below. a. ATM (Asynchronous Transfer Mode), Frame Relay b. HDLC (High Level Data Link Control), SDLC (Synchronous Data Link Control) c. ARP (Address Resolution Protocol), IEEE802.3 d. All the above
Description : Data Link Control Protocol (HDLC) is implemented at the ……… A. Data link layer B. Network layer C. transport layer D. Physical layer
Last Answer : A. receive sliding window.
Description : Which multiple access technique is used by IEEE 802.11 standard for wireless LAN? a. ALOHA b. CSMA/CA c. CDMA d. none of the mentioned
Last Answer : b. CSMA/CA
Description : Which of the following statement is incorrect? a. Multiplexers are designed to accept data from several I/O devices and transmit a unified stream of data on one communication line b. HDLC is a standard ... indicates that it is ready to accept data d. RTS/CTS is the way the terminal indicates ringing
Last Answer : RTS/CTS is the way the DTE indicates that it is ready to transmit data and the way the DCW indicates that it is ready to accept data
Description : _____defines a protocol data unit (PDU) that is somewhat similar to that of HDLC. A) MAC B) LLC C) LLU D) none of the above
Last Answer : LLC
Description : Which of the following is a data link protocol? a. ethernet b. point to point protocol c. hdlc d. all of the mentioned
Last Answer : d. all of the mentioned
Description : ………………...is a minimal protocol that allows isolated hosts to link via TCP/IP over the telephone network and ………………..uses a proposed international standard for transmitting HDLC over asynchronous lines. A. LCP, PPP B. PPP, LCP C. SLIP, PPP D. PPP, SLIP
Last Answer : C. SLIP, PPP
Description : The RTS and CTS frames in CSMA/CA ____ solvethe hidden stationproblem. The RTS and CTS frames in CSMA/CA ____ solve the exposed station problem. A) can; cannot B) cannot; can C) can; can D) cannot; cannot
Last Answer : can; cannot
Description : What is CSMA/CA?
Last Answer : ∙ CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is a protocol for carrier transmission in 802.11 networks. ∙ CSMA/CA acts to prevent collisions before they happen. ∙ In CSMA/CA, as soon as a node receives a packet that is to be sent, it checks to be sure the channel is clear.
Description : The minimum frame size required for a CSMA/CD based computer network running at 1 Gbps on a 200m cable with a link speed of 2 × 108m/s is a. 125 bytes b. 250 bytes c. 500 bytes d. None of these
Last Answer : b. 250 bytes
Description : Consider a CSMA/CD network that transmits data at a rate of 100 Mbps (108 bits per second) over a 1 km (kilometre) cable with no repeaters. If the minimum frame size required for this network is 1250 bytes, what is the signal speed (km/sec) in the cable? a. 8000 b. 10000 c. 16000 d. 20000
Last Answer : d. 20000
Description : What is CSMA/CD?
Last Answer : Carrier Sense Multiple Access with Collision Detection (CSMA/CD) When a station has a frame to transmit: 1) Listen for Data Transmission on Cable (Carrier Sense) 2) When Medium is Quiet (no ... for Collision. b) If collision is heard, stop transmitting, wait random time, and transmit again.
Description : LAN? a) CDMA b) CSMA/CA c) ALOHA d) CSMA/CD
Last Answer : b) CSMA/CA
Description : Which operational mode/s of HDLC support/s the balanced configuration by governing point to point link connectivity in addition to the primary as well as secondary functions performed by the station? a. NRM b. ABM c. Both a & b d. None of the above
Last Answer : b. ABM
Description : HDLC isan acronym for _______. A) High-duplex line communication B) High-leveldata link control C) Half-duplex digital link combination D) Hostdouble-level circuit
Last Answer : High-leveldata link control
Description : Which category of HDLC frames undergoes error and flow control mechanisms by comprising send and receive sequence numbers? a. Uframes b. Iframes c. Sframes d. All of the above
Last Answer : Sframes
Description : Write about Channel Access on links. Multiple Access Techniques Frequency Division Multiple Access
Last Answer : ∙ In frequency-division multiple access (FDMA), the available bandwidth is divided into frequency bands. ∙ Each station is allocated a band to send its data. ∙ When any one frequency level is ... called chips. ∙ Chips will be added with the original data and it can be transmitted through same
Description : Which type of Sframe in HDLC exhibit the correspondence of last three bits [N(R)] by defining the negative acknowledgement (NAK) number with the code value of '01'? a. Receive ready b. Receive not ready c. Reject d. Selective Reject
Last Answer : c. Reject
Description : Explain about HDLC
Last Answer : Station types: _ Primary station _ Secondary station Configurations: _ Unbalanced configuration _ Symmetrical configuration _ Balanced configuration Modes of communication: _ Normal Response Mode ... Flag field _ Address field _ Control field _ Information field _ FCS field
Description : Satellite-Switched Time-Division Multiple Access (SS/TDMA) is A. the method of determining whichdevice has access tothe transmission medium at any time. B. a medium access control technique for ... switching is used to dynamically changethechannel assignments D. All of theabove E. None of the above
Last Answer : a form of TDMA in which circuit switching is used to dynamically changethechannel assignments
Description : ________ requires that each station first listento the medium before sending. A) MA B) CSMA C) FDMA D) CDMA
Last Answer : CSMA
Description : In ______, the chanceof collisioncan be reduced if a station senses the medium beforetrying touse it. A) MA B) CSMA C) FDMA D) CDMA
Description : The vulnerable timefor CSMA is the ________propagationtime. A) the sameas B) two times C) three times D) none of the above
Last Answer : the sameas
Description : FCP stands for _________ a. Fiber Channel Protocol b. Field Channel Protocol c. Fast Channel Protocol d. Fiber Carrying Protocol
Last Answer : a. Fiber Channel Protocol
Description : Which of the following assertions is FALSE about the Internet Protocol (IP)? a. It is possible for a computer to have multiple IP addresses b. IP packets from the same source to the same ... outgoing packets; the route is determined only by the routing tables in the routers on the way
Last Answer : d. The packet source cannot set the route of an outgoing packets; the route is determined only by the routing tables in the routers on the way
Description : Which of the following is required to communicate between two computers? a. communications software b. protocol c. communication hardware d. all of above including access to transmission medium
Last Answer : all of above including access to transmission medium
Description : What type of telecommunicationshardware allows you to access the web? A) Browser B) Modem C) FTP protocol D) IRC
Last Answer : Modem
Description : Suppose you are browsing the world wide web using a web browser and trying to access the web servers. What is the underlying protocol and port number that are being used? a. UDP, 80 b. TCP, 80 c. TCP, 25 d. UDP, 25
Last Answer : b. TCP, 80
Description : A _____ is a TCP name for a transport service access point. a. port b. pipe c. node d. protocol
Last Answer : a. port
Description : The Dialup connections to access the internet uses ___ protocol. a. PPP (Point to Point protocol) b. X.25 protocol c. PLIP protocol d. None
Last Answer : a. PPP (Point to Point protocol)
Description : In the TCP/IP protocol architecture, the Network Access Layer includes ………………………………...layers of the OSI Reference Model. A. presentation, session, application B. physical, data link, network C. data link, network D. physical, data link
Last Answer : B. physical, data link, network
Description : Transmission system for a multidrop network A. Taken passing B. Polling C. Switching D. CSMA/CD
Last Answer : B. Polling
Description : Ethernet is baseband system using CSMA/CD operating at A. 20 Mbps B. 10 Mbps C. 30 Mbps D. 40 Mbps
Last Answer : B. 10 Mbps
Description : The reason a CSMA/CD network has a minimum length for packets is:
Last Answer : to make sure all other nodes hear a collision in progress