cs372 quiz1

What is the total utilization of a circuit-switched network, accommodating five users with equal bandwidth share, and the following properties: Two users each using 91% of their bandwidth share Two users each using 43% of their bandwidth share One user using 16% of their bandwidth share Give answer in percent, with one decimal place (normal rounding) and no percentage sign (e.g. for 49.15% you would enter "49.2" without the quotes).

The 2G cellular system GSM 900 operates its 125 forward channels in the uplink frequency band 890.2-915 MHz and 125 reverse channels in the frequency band 935.2-960 MHz. Each channel has   a bandwidth of 200 kHz.   i. What is the bandwidth in the forward channels (uplink frequency band) and reverse channels   (downlink frequency band)?   ii. If each channel is subdivided into 16 time slots, what is the sub channel spacing?   If each channel is shared by 16 users then compute the total number of users per cell?

a. Assume there are one million books in your campus library. Approximate (to the nearest order of magnitude) how many bytes of data there are if all these books were stored online and accessible across a computer network. b. How long does it take to transfer the entire collection of books if the data rate of the transmission medium is 10 Mbps, the speed of the original Ethernet? How long does it take if we have a line with a speed of 1 Gbps? (This value represents the time needed to download your entire campus library.)

If you had to download a 12 MByte narrated PowerPoint from your instructor, approximately how long would it take to transfer using each of the following circuits? Assume that control characters add 10% to the message.  Dial up modem at 33.6 Kbps   Cable modem at 1.5 Mbps   Cable modem at 1.5 Mbps with V.44 data compression at a 6:1 ratio DSL modem at 6 Mbps

COMPUTER NETWORKS, PLEASE ANSWER IT IF YOU ARE EXPERT ON THIS TOPIC.   100 stations use a wireless communications channel bandwidth of 1 MHz, in band 400MHz-401MHz. * Assuming all 100 stations use FDM (Frequency Division Multiplexing), what is the usual bandwidth allocation for each station?   * Assuming all 100 stations use CDMA (Code Division Multiple Access), what is the usual bandwidth allocation for each station?

62. Ethernet and Token-Ring are the two most commonly used network architectures in the world. Jim has heard of the different topologies for networks and wants to choose the architecture that will provide him with the most options. Which of the following would that be? Choose the most correct answer. a. Token-Ring, because it uses a MAU b. Ethernet, because it can be set up with most topologies and can use multiple transfer speeds c. Neither Token-Ring nor Ethernet is the proper choice. Only ARCnet can be used in all topologies d. Token-Ring because it currently can run at both 4Mbps and 16Mbps. This means that it can be used in any topology

Subject: Data Communication Networks Thanks in advance for your quick response! Question 4: An image is 800 × 600 pixels with 2 bytes/pixel. Assume the image is How long does it take to transmit it over a 56-kbps modem channel?  If the bandwidth of a spectrum band ranges from 106to 109Hz, what is the corresponding wavelength range?  3. A client-server system uses a satellite network, with the satellite at a height of 35,000 km. What is the best-case delay in response to a request?

Example: Assume your Student ID is 432306128. Use the first four numbers for caculating: ? = 8 + 1 + 3 = 12, ? = (5 + 8 + 1 + 3) × 36 = 612, ? = 0.75?Question 1:Assume you want to transmit PAL video as a YUV signal. Each pixel is represented by ? bits. What is the bit rate required to transmit this video as:1. Composite Video. 2. SeparatedVideo. 3. Component Video.Question 2:A system with 32768 possible colors is used to transmit ? × ? pixel image.1. What is the color depth of this system?2. How much storage is required for one image?3. What is the system bit rate if one image takes 1.3169 sec for transmission?Question 3What is the entropy of your name (hegab + alharthi)?Question 4Using the results of Question 3, Encode the first three characters of your full name using Arithmetic code?

Given a 2x1Gbps Etherchannel link, how many MiB per second can you transmit? Overhead not considered, Gb=Gigabit, MiB=Mebibyte Submit the steps of your calculation.

Question 3: In GSM, there are 8 separate time slots that makeup what is known as a “TDMA frame’’. Each GSM time slot lasts for 577 µs (microseconds) and contains more than simply a sample of each individual signal. i. How long does the TDMA frame last, express your answer in µs and ms?ii. Each time slot comprises a total of 148 bits. Of these 148 bits, only 114 represent voice or other data. The rest are used for a variety of control purposes. How many bits of data are in one TDMA frame? iii. How many bits for control purposes are in one TDMA frame? iv. What is the total number of bits, including data and control, in a TDMA frame?

7 An 802.11ac Wi-Fi radio has been configured with a high bandwidth super-channel. The radio is operating with the following parameters. Number of Subcarriers: 234 Modulation: 256 QAM Coding Rate: 5/6 (LEAVE AS A FRACTION IN YOUR CALCULATIONS) Spatial Streams: 4 Symbol Time: 4 us (microseconds)   What is the PHY Rate in Mbps? Enter a number without units. Truncate your answer to 1 decimal place (i.e. 5.4).

22. For a WiFi router in a open office, a _____ antenna will be used a. Omnidirectionalb. Unidirectionalc. Long throwd. Mesh 25. To secure traffic flowing over the internet, a _____ tunnel can be used a. PPPPb. LTTPc. PPOPEd. None of the provided options is correct 24. When data is encoded on an electromagnetic carrier such as the radio band using more than one channel, the transceiver is only half-duplex communication.a. Trueb. Falsec. Depends on the modulation used d. Depends on the protocol used,

How to increase a cell area of 2km2 coverage to a bigger coverage such as10km2 ?

100. Satellite-Switched Time-Division Multiple Access (SS/TDMA) is a. a form of TDMA in which circuit switching is used to dynamically change the channel assignments b. the method of determining which device has access to the transmission medium at any time c. a medium access control technique for multiple access transmission media d. all of the above

204. The cable modem for data transmission, is similar to a. high-bit-rate digital subscriber b. asymmetric DSL modem c. very high-bit-rate digital subscriber line modem d. asymmetric DSL lite

Which of the following is wrong about circuit-switching networks: If the resource is not used by the owner call/host, it is shared. If circuit-like (guaranteed) performance is required, end-to-end resources are reserved.

Dont answer if not known accurately and without knowledge If answer from other source of another platform I  will  downvote for sure answer only if you have accurate knowledge. Host A and Host B are connected by a single 2 Mbps (Megabits per second) link that has a propagation delay of 15 ms (milliseconds). Host A sends a 3000-byte packet starting at time t=0. At what time (in ms) is the packet fully received by Host B (i.e., what is the end-to-end delay)?

Computer Science Arriving at your university room, you plug into the wired Ethernet jack for the first time. The network admin has a record of your MAC address and your machine can join the network without further action on your part. Assume: Your laptop's Ethernet address is 0a:0b:0c:0d:0e:0f, DHCP server address is 131.111.7.3, your IPv4 address will be 131.111.7.121, the gateway's IP address is 131.111.7.1, and Ethernet address is 00:01:02:03:04:05, the network subnet mask is 255.255.255.0.Write the series of protocol/packet exchanges that occur on the wired Ethernet link, up until you can send a single packet to 128.232.0.20. You do not need to describe packets after this packet has left the link. Include ARP and DHCP.

232. The channels can be shared in an area with many subscribers with the help of a. multi casting b. frequency sharing c. data sharing d. time sharing

240. The Asymmetric Digital Subscriber Line- Lite (ADSL Lite) uses carriers for a. 512 DMT b. 64 DMT c. 256 DMT d. 900 DMT

You would like to transmit  three numbers from one node to another node using digital communication medium.  Each number you enter the keyboard has to be converted to digital bits ( i.e. ones and zeros).  How many bits will be needed to store  and send all three numbers;   Group of answer choices

dont answer by copying from other sources I want accurate answer I will downvote for sure if the answer is from other source or internet. Suppose that in a packet-switched VoIP network, Host A sends real-time voice to Host B. Host A converts analog voice to a digital 512 kbps bit stream on the fly. Host A then groups the bits into 256 byte packets. There is one link between Host A and B; its transmission rate is 12 Mbps and its propagation delay is 15 msec. As soon as Host A gathers a packet, it sends it to Host B. As soon as Host B receives an entire packet, it converts that packet’s bits to an analog signal. How much time elapses from the time a bit is created (from the original analog signal at Host A) until the bit is decoded (as part of the analog signal at Host B)?

Computer Science As an excellent networking engineer, you are tasked to propose a new (that is, from scratch) network architecture for this streaming system to lecture live-streaming system on campus for the students to attend classes remotely in their dorms. (a) Would you propose a circuit-switched, a packet-switched or a virtual circuit-switched architecture? Thoroughly summarize the pros and cons of each solution, and why you pick the one you choose. Show your work and use engineering arguments, such as impact on cost and QoS. (b) Estimate the average delay for video information, from the classroom to the viewer, for each candidate architecture above.