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Digital Systems II

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Network Protocols and Services

Score for this quiz: 98.72 out of 100.05 Submitted May 21 at 1:36pm This attempt took 41 minutes.   Question 1 5.34 / 6.67 pts Every NIC is embedded with a unique address that consists of a 12-digit hexadecimal value.  What is this address called? Select all that apply.   IP address   subnet mask Correct!   MAC address   default gateway Correct!   Physical Address Correct Answer   Ethernet Address Correct!   Burned-In Address Correct!   BIA   Question 2 6.67 / 6.67 pts In Hexadecimal the number 15 corresponds to which of the following binary patterns? Correct!   0001 0101   11111111   0111   11110000   Question 3 6.67 / 6.67 pts The network numbering system used by the Internet is based on which of the following protocols?  Correct!   TCP/IP   OSI   IEEE   IPX/SPX   Question 4 6.67 / 6.67 pts Which of the following are advantages of using Fiber Optic Media? (choose two) Correct!   High Bandwidth capacity   Ease of repair   Low cost of installation Correct!   Not susceptible to Electro-Magnetic Interference   Question 5 6.67 / 6.67 pts Which of the following is a major disadvantage of a peer to peer network? Correct!   It does not work for large networks   It is expensive to manage   It is more secure   Users need less training   Question 6 6.67 / 6.67 pts The decimal number 33 would be converted to which of the following binary strings?   100001001   00011111 Correct!   00100001   01000001   Question 7 6.67 / 6.67 pts Which of the following decimal numbers are equal to the binary string 1 1 1 1 1 1 1 1 ? Correct!   255   255.0.0.0   15, 15   FF   Question 8 6.67 / 6.67 pts For a switch to function as it was intended, it must be able read and process the ___________. Correct!   MAC Address   IP Address   Port Number   Default Gateway   Question 9 6.67 / 6.67 pts The value of the hexadecimal number FF in decimal? Correct!   255   1111   11111111   15   Question 10 6.67 / 6.67 pts A byte consist of how many bits? Correct!   8   4   16   32   Question 11 6.67 / 6.67 pts To connect two like devices, such as two computers directly to each other, would require which kind of cable to ensure the connection works? Correct!   Crossover Cable   Straight Cable   Console Cable   T-1 Cable   Question 12 6.67 / 6.67 pts Which of the following best describes a node? Correct!   Any network device that can receive and/or send standardized signals   An un-powered central wiring junction   A wall plate leading to a switch   A locally connected printer   Question 13 6.67 / 6.67 pts Which of the following best describes the difference between a client server environment and a peer to peer environment? Correct!   Client Server provides centralized control of resources   Client Server allows each machine to control its resources   Peer to Peer provides for centralized control   Client Server provides the operating system to all clients   Question 14 6.67 / 6.67 pts A network interface card reads a incoming frame's MAC address and compares it to:   The source MAC Address Correct!   Its own burned in MAC address   The router's MAC Address   The internal IP Address   The OUI

CIS | 150 | Networking I | assessment | Score for this quiz: 98.72 out

EET121 Homework 5 1. Two condions for oscillaon are: 1) voltage gain around the closed feedback loop(loop gain)must be 1(unity) 2)The phase shiﬅ around the feedback loops must around 0 2. For an oscillator to properly start, the gain around the feedback loop must inially be greater than 1 ( True/False) 3. Wien-bridge oscillators are based on posive feedback. 4. A phase-shiﬅ oscillator uses 3 RC circuits. 5. If the voltage gain of the ampliﬁer poron of an oscillator is 75, what must be the aenuaon of the feedback circuit to sustain the oscillaon? Acl=Av(B)=1 B= 1 Av = 1 75 = 0.0133 6. Calculate the resonant frequency of a lead-lag circuit with the following values: R 1 = R 2 = 6.2 kΩ, and C 1 = C 2 = 0.02 μF. fr 1 = 1 2 π √ 6 RC = ¿ 524.3 Hz 7. Determine the necessary value of R 2 in Fig. 1 so that the circuit will oscillate. Neglect the forward resistance of the zener diodes. ( Hint: The total gain of the circuit must be 3 when the zener diodes are conducng.) R1=2R2 R2= R 1 2 50kΩ Fig. 1 8. Explain the purpose of R 3 in Fig. 1. With DC power applied, both Zener diodes appear as open, because there’s not enough output voltage. When this is true, R3 ends up in series with R1, increasing the Closed-loop gain to a value greater than unity to assure that oscillaon begins. 9. The Wien-bridge oscillator’s posive feedback loop is a lead-lag circuit. 10. What value of R f is required in Fig. 2? What is f r ? Acl=29, and B=1/29 = R3/Rf, therefore Rf/R3= 29 Rf=29(R3)=29(4.7kΩ)=136kΩ R1=R2=R3=R and C1=C2=C3=C, Therefore, f r = 1/(2)3.14)Sqrt6(4.7kΩ)(0.022µF)= 628Hz Fig. 2

EET | 121 | Electronic Devices and Circuits | homework | EET121 Homework 5 1. Two condi

Question 43 In the network shown find Vo using superposition Question 44 Use Thevenin’s Theorem to find Vo in the network shown. R TH  = 2K || 4K = (2 * 4) / (2 + 4) =  1.33 K Ω V 1  = - 6 (4K / (4K + 2K)) = -4V V OC  = 12 + V 1  = 12 + (-4V) = 8V   V O  = 4.8V Question 45 By definition, Norton resistance ( R N ) is the resistance measured across the Select one: a. open internal resistance b. shorted internal resistance c. open load terminals of a circuit d. shorted load terminals of a circuit Question 46 What is the symbol usually used inside a circle to designate a current source? a. an arrow b. a current wave c. a sine wave d. a circle Question 47 The value of R TH  for the circuit described in question 11 is a. 104 Ω b. 522 Ω c. 1.04 kΩ d. 1,400 Ω Question 48 The superposition theorem is used to simplify circuit analysis where two or more sources are present. True False Question 49 Thevenin's theorem states that any resistive circuit or network can be represented as a a. current source in series with a source voltage b. current source in series with a source resistance c. voltage source in series with a loop resistance d. voltage source in series with a source resistance Question 50 Open circuit voltage refers to: a. the output voltage with no load. b. the voltage taken across a  high  value load resistor. c. zero internal resistance. d. the voltage taken across a  low  value load resistor Question 51 In the figure shown below, determine the voltage Vx using superposition principle with the voltage source and current source each acting alone respectively Select one: a. 5 V, 10 V b. 7 V, 12 V c. 2.7 V, 11 V d. 1 2 V, 10 V Question 52 For the circuit shown in figure below, determine the thevenin resistance seen by the load RL Select one: a. 12 Ohms b. 10 Ohms c. 16 Ohms d. 20 Ohms Question 53 For the circuit shown in the figure below, determine the Thevenin voltage seen by the load RL Select one: a. 40 V b. 26 V c. 20 V d. 10 V Question 54 Refer to Figure 6-5. Determine the amount of current flow through R2 with the following component parameters. V S1  = 10 V, V S2  = 3 V, R 1  = 2 k, R 2  = 3 k, and R 3  = 700. Use superposition theorem. Select one: a. 1.37mA b. 1 mA c. 0 A d. 5.3 mA Question 55 The first steps to Thevenizing a circuit are: Select one: a. open R L , determine I L , make R L  × I L  = V th b. short R L , determine I L , make I L  = I th c. open R L , determine V L , make V L = V th d. open R L , determine R th , make   =  I th See Figure 9.4. What is the Norton equivalent resistance R N  external to the resistor R? Select one: a. 3.33 Ω b. infinity c. 15 Ω d. 5 Ω Given the circuit in Figure 8-3, Calculate V  TH  and R  TH . Select one: a. V  TH  = 6.7 V, R  TH  = 150 Ω b. V TH = 10 V, R TH = 150 Ω c. V  TH  = 10 V, R  TH  = 50 Ω d. V  TH  = 5.0 V, R  TH  = 50 Ω

EET | 310 | Digitial Electronics | assessment | Question 43 In the network sho

9/7/2017 Unit 1 Homework 5 (CWNA Ch 5): 201708E CHAS EET282 NTR Wireless Security A. Holmes https://ecpi.instructure.com/courses/13567/quizzes/53726 1/5 Unit 1 Homework 5 (CWNA Ch 5) Due Sep 7 at 11:59pm Points 99.99 Questions 9 Time Limit None Aempt History Attempt Time Score LATEST Attempt 1 27 minutes 99.99 out of 99.99 Score for this quiz: 99.99 out of 99.99 Submitted Sep 7 at 8:16pm This attempt took 27 minutes. 11.11 / 11.11 pts Question 1 Which of the following were not true with respect to the original 802.11 standard? Only radio speeds of 1 &amp; 2 Mbps were specified. Either DSSS or FHSS radios could be used but they could not interoperate with each other. Data throughput was typically 1/2 or less than the available data rate speed. Either DSSS and FHSS radios could be used and they could interoperate with each other. Correct! 11.11 / 11.11 pts Question 2 Which of the following are true of 802.11ac? Choose all that apply. Was ratified in 2013 Correct! Uses&nbsp;only in the 5 GHz frequency bands Correct! Use of channel bonding with the capability of using 80 and 160 MHz channels as compared to the 40 MHz channels allowed by 802.11n Correct! 9/7/2017 Unit 1 Homework 5 (CWNA Ch 5): 201708E CHAS EET282 NTR Wireless Security A. Holmes https://ecpi.instructure.com/courses/13567/quizzes/53726 2/5 Provides the capability of using 256 QAM modulation which provides a significant increase in data throughput. Correct! Improved MIMO and beamforming capabilities over those provided by 802.11n Correct! 11.11 / 11.11 pts Question 3 Seamless roaming will work just as well when using access points from a variety of vendors as it will if all of the access points in the network are from the same vendor. True False Correct! 11.11 / 11.11 pts Question 4 The default operational mode for 802.11g access points is _____. Bonly Gonly B/G (Mixed) Correct! 11.11 / 11.11 pts Question 5 Match the following wireless security terms with the most appropriate description. Uses RC4 stream cipher with no provision for automatically varying the encryption key. WEP Correct! 9/7/2017 Unit 1 Homework 5 (CWNA Ch 5): 201708E CHAS EET282 NTR Wireless Security A. Holmes https://ecpi.instructure.com/courses/13567/quizzes/53726 3/5 Uses the RC4 stream cipher. Does not use the passphrase itself for encryption. Employs Temporal Key Integrity Protocol (TKIP) WPA Correct! Uses the AES block cipher along with Counter Mode with Cipher Block Chaining Message (CCMP). Cannbsp;optionally use RC4 with Temporal Key Integrity Protocol (TKIP) WPA2 Correct! 11.11 / 11.11 pts Question 6 Match the Technology with the best description shown. Uses light rather than RF. Specified as a medium in the original 802.11 standard but not included in the amendments such as 802.11b, 802.11g, and so forth. Infrared (IR) Correct! Originally patented during WWII. Specified as a transmission methodnbsp;in the original 802.11 standard. Used primarily for Bluetooth today. Frequency Hopping Spread Spe Correct! Specified as a transmission method in the original 802.11 standard. Used in 802.11b. Used in 802.11g at transmission speeds of 11 Mbps and below. Not used at speeds above 11 Mbps. Direct Sequence Spread Spectr Correct! Not specified as a transmission method in the original 802.11 standard. Used in 802.11g, n, and ac with transmission speeds above 11 Mbps. Orthoganal Frequency Division Correct! 11.11 / 11.11 pts Question 7

EET | 282 | Wireless Security | homework | 9/7/2017 Unit 1 Homework 5 (CW

Unit 1 Quiz Queson 1 7 / 7 pts Common cloud deployment models include: Community clouds Private clouds Public clouds Hybrid clouds Correct! All of the above Queson 2 7 / 7 pts _____________ deﬁnes a site or applicaon's ability to use addional resources on demand. It allows an organizaon to add resources when needed and to remove them when not needed. Portability Virtualizaon Robustness Correct! Scalability Queson 3 7 / 7 pts ____________ the use of hardware and/or soﬅware to create the percepon of something. Portability Correct! Virtualizaon Robustness Scalability Queson 4 Not yet graded / 9 pts Deﬁne Soﬅware as a Service (SaaS) Your Answer: Soﬅware Deployed over the internet. Managed from a central locaon. Soﬅware applicaon with a user interface. Queson 5 Not yet graded / 12 pts List at least three advantages of SaaS soluons Your Answer: Lower Costs, Scalability, Ease of use, Rapid Implementaon Queson 6 Not yet graded / 15 pts List at least 3 advantages and 3 disadvantages of PaaS (Plaorm as a Service) Your Answer: Pros- Automac updates, lower costs, compatability Cons- Limited scalability, data back ups, locked into a system not needed Queson 7 7 / 7 pts To handle high-traﬃc web requests, sites use a technique known as _____________, to share the requests across mulple servers. robustness mashups Correct! load balancing clouding None of the above Queson 8 Not yet graded / 12 pts List at least 3 advantages of IaaS (Infrastructure as a Service) Your Answer: Hardware scalability, eliminaon of data center, system administraon and management Queson 9 Not yet graded / 12 pts List at least 3 advantages if SSO (Single Sign on) Your Answer: Improved auding, help desk cost reducon, compliance and security Queson 10 Not yet graded / 12 pts List at least 3 threats to mobile devices Your Answer: Data leaks, unsecured wiﬁ, spyware, phishing aacks Quiz Score: 28 out of 100

CIS | 142 | Cloud Comuting Concepts | assessment | Unit 1 Quiz Queson 1 7 / 7 pt

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