Network Security
Pre-Test Questions
Course Introduction
Network Security explores the principles, protocols, and practices essential for safeguarding communication and data within networked environments. The course examines various types of cyber threats, vulnerabilities, and attacks targeting network infrastructures, as well as the tools and technologies used to detect, prevent, and respond to these risks. Topics include cryptographic fundamentals, firewalls, intrusion detection and prevention systems (IDS/IPS), secure network architectures, virtual private networks (VPNs), wireless security, and network policy management. Students gain practical experience with configuring and securing network devices, analyzing network traffic for malicious activity, and understanding compliance and ethical considerations in network security management.
Recommended Textbook
Data Communications and Computer Networks A Business Users Approach 7th Edition by Curt
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13 Chapters
1238 Verified Questions
1238 Flashcards
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Page 2
Chapter 1: Introduction to Computer Networks and Data Communications
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Sample Questions
Q1) A(n) ____________________ converts the local area network data into wide area network data.
Answer: router
Q2) Briefly explain some examples of convergence in the wireless market.
Answer: Today we see many different examples of convergence, particularly in the wireless markets. For example, it is now quite common to snap a photo using a cell phone and then transfer the image over the cell phone network to another cell phone. Shortly after the introduction of photo-enabled cell phones, cell phones also became capable of sending and receiving instant messages. Then in 2005, cell phone providers started offering services that allow a user to transmit high-speed data over a cell phone connection. These all are examples of the convergence of two different applications (for example, digital photography and cell phones in the case of photo-enabled cell phones) into a single technology.
Q3) The ____________________ layer of the OSI model is responsible for creating, maintaining, and ending network connections.
Answer: network
Q4) The top layer in the OSI model is the ____________________ layer, where the application using the network resides.
Answer: application
Page 3
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Chapter 2: Fundamentals of Data and Signals
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Sample Questions
Q1) With ____, a codec tracks the incoming analog data by assessing up or down "steps."
A)differential Manchester
B)Bipolar-AMI
C)NRZI
D)delta modulation
Answer: D
Q2) Because extraneous noise degrades original signals, an electronic device usually has a(n) ____________________ that is less than its bandwidth.
Answer: effective bandwidth
Q3) The ____________________, or time interval, of one cycle is called its period.
Answer: length
Q4) ____ is the process of sending data over a signal by varying either its amplitude, frequency, or phase.
A)Amplification
B)Modulation
C)Attenuation
D)Digital encoding
Answer: B
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Chapter 3: Conducted and Wireless Media
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103 Flashcards
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Sample Questions
Q1) Single-mode fiber-optic cable is labeled 62.5/125 cable.
A)True
B)False
Answer: False
Q2) Coaxial cable is available in a variety of thicknesses, with two primary physical types: thick coaxial cable and ____________________ coaxial cable.
Answer: thin
Q3) ____ cable is a thin glass cable, a little thicker than a human hair, surrounded by a plastic coating.
A)Single-stranded coaxial
B)Fiber-optic
C)Braided coaxial
D)CAT 7
Answer: B
Q4) ZigBee is a form of wireless technology used within buildings.
A)True
B)False
Answer: True
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Page 5
Chapter 4: Making Connections
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Sample Questions
Q1) ____________________ is an easy-to-use, flexible, and low-cost digital interface that is capable of supporting transfer speeds of up to 3.2 Gbps.
Q2) A technique called ____________________, which allows only one terminal to transmit at one time, successfully controls multiple terminals that share a connection to a mainframe computer.
Q3) ____________________ polling is the polling method in which the mainframe computer (primary) polls each terminal (secondary), one at a time, in round-robin fashion.
Q4) A ____ port is a connection in which eight data lines transmit an entire byte of data at one moment in time.
A)serial
B)parallel
C)DIN
D)USB
Q5) If transmitting a digital signal, use a Manchester code. Because a Manchester code always has a signal transition in the middle of each bit, the receiver can anticipate this signal transition and read the incoming data stream with no errors. A Manchester-encoded digital signal is an example of a self-clocking signal.
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Page 6
Chapter 5: Making Connections Efficient: Multiplexing and Compression
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Sample Questions
Q1) ______ is a technique that is very commonly used to compress video images.
A)JPEG
B)MPEG
C)MP3
D)AAA
Q2) The device that is attached to the receiving end of the medium and splits off each signal to deliver it to the appropriate receiver is called the second multiplexor, or ____.
A)multiplexor
B)endplexor
C)splitxor
D)demultiplexor
Q3) Synchronous time division multiplexing does not require as high-speed a line as statistical time division multiplexing does.
A)True
B)False
Q4) A T-1 telecommunications line uses a multiplexing technique termed ____________________, which provides for the multiplexing of up to 24 separate channels at a total speed of 1.544 Mbps.
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Chapter 6: Errors, Error Detection, and Error Control
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Sample Questions
Q1) Causes of jitter can include electromagnetic interference, ____, passing the signal through too many repeaters, and the use of lower-quality equipment.
A)coding
B)sampling
C)compression
D)crosstalk
Q2) The most basic error-detection techniques are parity checks, which are used with ____ connections.
A)synchronous
B)asynchronous
C)statistical
D)fiber-optic
Q3) ____ for error control is becoming a mode of operation for some modern wide area network transmission techniques.
A)Returning a message
B)Toss the frame/packet
C)Correcting the error
D)Fixing the error
Q4) How does the cyclic redundancy checksum work?
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Chapter 7: Local Area Networks: Part I
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Sample Questions
Q1) A local area network (LAN) is a communications network that interconnects a variety of data communications devices within a small geographic area and broadcasts data at high data transfer rates. Expand on this definition by explaining the various terminology used.
Q2) The ____________________ is a device that connects workstations to local area networks and retransmits the incoming frame.
Q3) A(n) ____________________ occurs when two or more workstations listen to the medium at the same moment, hear nothing, and then transmit their data at the same moment.
Q4) Perhaps the strongest advantage of a local area network is its capability of allowing users to share hardware and software resources.
A)True
B)False
Q5) A hub is designed to perform much faster than a switch.
A)True
B)False
Q6) One of the most common standards for broadband (analog) Ethernet was the ____________________ specification.
Q7) How does a star-wired bus topology work?
Page 9
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Chapter 8: Local Area Networks: Part II
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Sample Questions
Q1) What are some of the more common RAID techniques?
Q2) The ____ server is usually a high-powered workstation that maintains a large file system of data sets, user profiles, and access information about all the network peripherals.
A)network
B)file
C)print
D)operating system
Q3) A(n) _________________________ is an object that is further composed of additional objects (examples of which include servers, printers, users, or groups of users).
Q4) The design of a tree should ideally be similar to a pyramid.
A)True
B)False
Q5) NDS is based on a well-known standard for directory services called ____.
A)X.300
B)X.500
C)X.600
D)X.700
Q6) Briefly explain the evolution of the wireless LAN protocols.
Page 10
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Chapter 9: Introduction to Metropolitan Area Networks and
Wide Area Networks
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Sample Questions
Q1) Broadcast networks are as common as circuit-switched and packet-switched networks.
A)True
B)False
Q2) ____ is advantageous when a copy of a packet needs to get to all nodes.
A)Flooding
B)Dijkstra's least-cost
C)Dijkstra's shortest-path
D)Dijkstra's maximum-cost
Q3) ____ are advertised as networks with very low error rates and extremely high throughput.
A)PANs
B)UANs
C)GANs
D)MANs
Q4) A(n) ____________________ network is a sub-network in which a dedicated circuit is established between sender and receiver, and all data passes over this circuit.
Q5) In a(n) ____________________ packet-switched network, each data packet can follow its own, possibly unique, course through the sub-network.
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Chapter 10: The Internet
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Sample Questions
Q1) All Uniform Resource Locators consist of six parts.
A)True
B)False
Q2) Most HTML tags consist of an opening tag, followed by one or more attributes, and a closing tag.
A)True
B)False
Q3) In 1983, the Department of Defense broke the ARPANET into two similar networks: the original ARPANET and ____.
A)MILNET
B)NSFnet
C)CampusNET
D)DoDNET
Q4) Intranets use essentially the same hardware and software that is used by other network applications.
A)True
B)False
Q5) Using a Web browser, you can download and view Web pages on a personal computer.
A)True
B)False
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Chapter 11: Voice and Data Delivery Networks
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Sample Questions
Q1) Only two wires are required to complete a telephone circuit.
A)True
B)False
Q2) _______________ is the term for the convergence of real-time and non-real-time communications services such as telephony, instant messaging, video conferencing, speech recognition, voice mail, and email into a single interface.
A)Big Bundle
B)AT&T
C)Unified communications
D)Frame relay
Q3) After the 1984's Modified Final Judgment, the local telephone companies became known as ______________________________.
Q4) ____ means that users can specify telephone numbers that are allowed to get through.
A)PBX graphic user interface
B)Customized menuing system
C)Fax-back
D)Call filtering
Q5) What are the advantages and disadvantages of ATM?
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Chapter 12: Network Security
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Sample Questions
Q1) To authenticate electronic documents as yours, you need to create a digital signature.
A)True
B)False
Q2) Early cryptography algorithms used the same key for both encryption and decryption.
A)True
B)False
Q3) ____ spread spectrum spreads the transmission of a signal over a wide range of frequencies using mathematical values.
A)Frequency hopping
B)Direct sequence
C)Time hopping
D)Amplitude sequence
Q4) Public key cryptography is also called ____________________ encryption.
Q5) A digital certificate, or simply a(n) ____________________, is an electronic document, similar to a passport, that establishes your credentials when you are performing transactions on the World Wide Web.
Q6) How does phishing work?
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Chapter 13: Network Design and Management
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Sample Questions
Q1) Although every device is different, the shorter the mean time between failures, the better.
A)True
B)False
Q2) What are the SDLC phases?
Q3) When performing a payback analysis calculation, you should show all dollar amounts using the ____.
A)time value of money
B)money value of time
C)computer simulation
D)benchmarking
Q4) The term "feasible" has several meanings when it's applied to computer-based projects.
A)True
B)False
Q5) ____________________ calculates the probability that a component or system will be operational for the duration of a transaction of time t.
Q6) What are the skills needed by a network administrator?
Q7) Provide an example of capacity planning using linear projection.
Page 15
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