Description : _______ allow insertion and extraction of signals. A) regenerators B) ADMs C) STS multiplexer/demultiplexers D) none of the above
Last Answer : regenerators
Description : A ________ is a repeater. A) regenerator B) ADM C) STS multiplexer/demultiplexer D) none of the above
Last Answer : STS multiplexer/demultiplexer
Description : An add/drop multiplexer isa ______device. A) one-layer B) two-layer C) three-layer D) four-layer
Last Answer : three-layer
Description : The simplest type of switching fabric is the ______ switch. A) crosspoint B) crossbar C) TSI D) STS
Last Answer : crossbar
Description : An STS-3 frameis madeof ______ rows. A) 1 B) 9 C) 27 D) none of the above
Last Answer : 27
Description : Which network component/s is/are involved in the Presentation layer of an OSI model? a. Gateway b. Multiplexer & Oscilloscope c. Amplifier & Hub d. All of the above
Last Answer : a. Gateway
Description : A communications device that combines transmissions from several I/O devices into one line is a a. concentrator b. modifier c. multiplexer d. full-duplex line
Last Answer : multiplexer
Description : A communication device that combines transmissions from several I/O devices into one line is a A) Concentrator B) Modifier C) Multiplexer D) Full duplex file
Last Answer : C) Multiplexer
Description : A regenerator is a________ device. A) one-layer B) two-layer C) three-layer D) four-layer
Last Answer : four-layer
Description : A ______is the end-to-end portion of the network between two STS multiplexers. A) section B) line C) path D) none of the above
Last Answer : path
Description : An STS-3 frameis madeof ________columns. A) 9 B) 90 C) 270 D) none of the above
Last Answer : none of the above
Description : An STS-1 frameis made______columns A) 1 B) 9 C) 90 D) none of the above
Last Answer : 90
Description : An STS-1 frameis madeof ________rows A) 1 B) 9 C) 90 D) none of the above
Last Answer : 1
Description : A SONET system can use _________. A) STS multiplexers B) regenerators C) add/drop multiplexers D) all of theabove
Last Answer : add/drop multiplexers
Description : An ______signal is the optical modulation of an STS-n (or STM-n) signal. A) OC-n B) TDM-n C) FDM-n D) none of the above
Last Answer : TDM-n
Description : In IEEE 802.11, the MAC layer framehas ______ fields. A) four B) five C) six D) none of the above
Last Answer : four
Description : Which of the following does not allow multiple uses or devices to share one communication line? a. doubleplexer b. multiplexer c. concentrator d. controller
Last Answer : concentrator
Description : Which of the following might be used by a company to satisfy its growing communications needs? a. front end processor b. multiplexer c. controller d. concentrator e. all of the above
Last Answer : all of the above
Description : The ______ layer is responsible for the movementof a signal across a physical section. A) section B) line C) path D) photonic
Last Answer : section
Description : The ______ layer is responsible for the movementof a signal from its optical source to its optical destination. A) section B) line C) path D) photonic
Last Answer : line
Description : Sometimes, Session layer is also called ______ layer a. Virtual layer b. Port layer c. Segmentation layer d. Process layer
Last Answer : b. Port layer
Description : The physical layer translates logical communication requests from the ______ into hardware specific operations. a. data link layer b. network layer c. trasnport layer d. application layer
Last Answer : a. data link layer
Description : One of the responsibilities of the transport layer protocol is to create a ______ communication. A. host-to-host B. process-to-process C. node-to-node D. none of the above
Last Answer : B. process-to-process
Description : Multiplexing in a time division multiplexer occurs based upon A. the position of a frame within the group of frames B. the positioning of data within a frame C. the priority assigned to a connected device D. the activity of a connected device
Last Answer : B. the positioning of data within a frame
Description : A device which converts BCD to Seven Segment is called (A) Encoder (B) Decoder (C) Multiplexer (D) Demultiplexer
Last Answer : Ans: B A device which converts BCD to Seven Segment is called DECODER. (A decoder coverts binary words into alphanumeric characters.)
Description : The device which changes from serial data to parallel data is (A) COUNTER (B) MULTIPLEXER (C) DEMULTIPLEXER (D) FLIP-FLOP
Last Answer : Ans: C The device which changes from serial data to parallel data is demultiplexer. (A demultiplexer takes in data from one line and directs it to any of its N outputs depending on the status of the select inputs.)
Description : In the ______ method, all dataexchanges mustbe made throughthe primarydevice even when theultimate destinationis a secondary device. A) reservation B) polling C) token passing D) none of the above
Last Answer : polling
Description : In TCP IP Model, when data is sent from device A to device B, the 5th layer to receive data at B is ____________ a.Application layer b.Transport layer c.Link layer d.Session layer
Last Answer : a.Application layer
Description : In OSI model, when data is sent from device A to device B, the 5th layer to receive data at B is _________ a. Application layer b. Transport layer c. Link layer d. Session layer
Last Answer : d. Session layer
Description : A layer-4 firewall (a device that can look at all protocol headers up to the transport layer) CANNOT a. block entire HTTP traffic during 9:00PM and 5 :0OAM b. block all ICMP traffic c. stop ... address d. block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM
Last Answer : d. block TCP traffic from a specific user on a multi-user system during 9:00PM and 5:00AM
Description : The network layer contains which hardware device? a. Routers, Bridges b. Bridges only c. Bridges and switches d. Routers, Bridges and Switches
Last Answer : d. Routers, Bridges and Switches
Description : .In TCP IP Model, when data is sent from device A to device B, the 5th layer to receive data at B is ____________ a. Application layer b. Transport layer c. Link layer d. Session layer
Last Answer : a. Application layer
Description : In OSI model, when data is sent from device A to device B, the 5th layer to receive data at B is _________ a) Application layer b) Transport layer c) Link layer d) Session layer
Last Answer : d) Session layer
Description : Which of the following statements accurately describe the differences between a hub and a switch? Check all that apply. A. A switch remembers which devices are connected on each interface, while a hub does not. B. A hub is a ... versions of switches. a. A,B b. A,B,C c. A,B,C,D d. A,C,D
Last Answer : b. A,B,C
Description : A device operating at Physical layer is called a. Repeater b. Gateway c. Router d. Bridge
Last Answer : a. Repeater
Description : A device operating at network layer is called a. Repeater b. Router c. Gateway d. Bridge
Last Answer : b. Router
Description : A multiplexer combines four 100-Kbps channels using a time slot of 2 bits. What is the bit rate? (A) 100 Kbps (B) 200 Kbps (C) 400 kbps (D) 1000 Kbps
Last Answer : (C) 400 kbps
Description : ______ substitutes four consecutive zeros with 000V or B00V A) B4B8 B) HDB3 C) B8ZSf D) none of the above
Last Answer : HDB3
Description : ______ is the first layer of software loaded into computer memory when it starts up. A. Device Drivers B. Language translators C. System Utilities D. Operating system
Last Answer : D. Operating system
Description : Inslotted ALOHA, the vulnerable time is ______ the frame transmissiontime. A) the sameas B) two times C) three times D) none of the above
Last Answer : the sameas
Description : In a three-stage space division switch, if N = 200, the number of crosspoints is ______. A) 40,000 B) greater than 40,000 C) less than40,000 D) greater than 100,000
Last Answer : ess than40,00
Description : The ______ scheme uses three levels (+V, 0, and-V) andthree transition rules to move betweenthe levels. A) 4B5B B) 2B1Q C) MLT-3 D) none of the above
Last Answer : MLT-3
Description : TCP/IP layer corresponds to the OSI models to three layers. A) Application B) Presentation C) Session D) Transport
Last Answer : A) Application
Description : Which of the following is NOT true about User Datagram Protocol in transport layer? a. Works well in unidirectional communication, suitable for broadcast information. b. It does three way ... File System d. The lack of retransmission delays makes it suitable for real-time applications
Last Answer : b. It does three way handshake before sending datagrams
Description : The Post Office Protocol is an ………... protocol with both client (sender/receiver) and …………...functions A. electronic mail, server (storage) B. three layer , server C. UDP, transfer D. TCP, server
Last Answer : A. electronic mail, server (storage)
Description : Is space debris the explanation for NASA's STS-75 tether incident?
Last Answer : i’m not an astronomer, but i think that space debris doesn’t change directions like that.
Description : I have taught my self to knit and am working on a baby blanket. The pattern says p2tog without slipping sts off needle, then k2tog over same sts. What does that mean?
Last Answer : Is there a button hole or little space in the picture of blanket? After you p2tog., you have one stitch on needle. It is not very clear and I have been knitting for years. Is there a knitting shop near you?. Maybe w. the instructions in front of her, the expect could explain. Makes no sense to me.