Network Security Test Bank
Course Introduction
Network Security examines the principles and practices essential for securing computer networks against threats and vulnerabilities. The course covers topics such as authentication, authorization, encryption, network protocols, firewalls, intrusion detection systems, and virtual private networks (VPNs). Students will explore common attack vectors like malware, social engineering, and denial-of-service attacks, along with defense mechanisms to mitigate these risks. Through theoretical knowledge and hands-on labs, students will develop critical skills in designing secure networks, implementing security policies, and performing risk assessments in various networking environments.
Recommended Textbook
Data and Computer Communications 10th Edition by William Stallings
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Page 2
Chapter 1: Data Communications, data Networks,
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Q1) In a ________ network,a dedicated communications path is established between two stations through the nodes of the network.The telephone network is the most common example.
A)frame relay
B)ATM
C)circuit switching
D)packet switching
Answer: C
Q2) A dominant architecture in the business environment and the more recent Web-focused intranet trend is ________ computing.
A)Ethernet
B)GUI
C)token ring
D)client/server
Answer: D
Q3) Growth in services and growth in traffic capacity go hand in hand.
A)True
B)False
Answer: True
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Page 3
Chapter 2: Protocol Architecture, tcpip, and
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Q1) For most applications running as part of the TCP/IP protocol architecture,the transport layer protocol is TCP.
A)True
B)False
Answer: True
Q2) ________ provides a secure remote logon capability which enables a user at a terminal or personal computer to logon to a remote computer function as if directly connected to that computer.
Answer: Secure Shell (SSH)
Q3) If the initiator receives confirmation that the requested service has had the desired effect at the other end,it is referred to as a ________ service.
Answer: confirmed
Q4) IPv6 includes ________ bit source and destination address fields.
Answer: 128
Q5) Each application on a computer has an address that is unique within that computer known as ________ or ports that allow the transport layer to support multiple applications at each computer.
Answer: Service Access Points (SAPs)
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Chapter 3: Data Transmission
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Q1) The ________ is the maximum value or strength of the signal over time; typically this value is measured in volts.
A)period
B)phase
C)frequency
D)peak amplitude
Answer: D
Q2) An example of digital data is ________ or character strings.
A)interlaced
B)text
C)audio
D)video
Answer: B
Q3) A major problem in designing a communications facility is transmission impairment.
A)True
B)False
Answer: True
Q4) Thermal noise is also referred to as ________ noise. Answer: white
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Chapter 4: Transmission Media
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Q1) The ________ frequency band is used for satellite communication,radar,terrestrial microwave links,and wireless local loop.
Q2) ________ is a general term used to encompass frequencies in the range of 3 kHz to 300 GHz.
A)Radio
B)Satellite
C)Terrestrial microwave
D)Broadcast radio
Q3) Twisted pair,coaxial cable and optical fiber are examples of ________ media,which provide a physical path along which signals are propagated.
Q4) Coaxial cable can be used over longer distances and support more stations on a shared line than twisted pair.
A)True
B)False
Q5) Unshielded twisted pair provides better performance at higher data rates.
A)True
B)False
Q6) A thin,flexible medium capable of guiding an optical ray is an ________.
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Chapter 5: Signal Encoding Techniques
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Q1) The process of converting analog data into digital data is known as ________.
Q2) A digital signal is a sequence of discrete,discontinuous voltage pulses.
A)True
B)False
Q3) NRZI is an example of ________ encoding.
Q4) A popular analog signaling technique that is used in the asymmetric digital subscriber line is ________ modulation.
Q5) There is a transition at the middle of each bit period in the ________ biphase coding technique.The midbit transition serves as a clocking mechanism and also as data.A low-to-high transition represents a 1,and a high-to-low transition represents a 0.
Q6) The biphase codes are known as self-clocking codes. A)True
B)False
Q7) The ________ rate,expressed in baud,is the rate at which the signal level is changed.
Q8) In the ________ scheme,a binary 0 is represented by no line signal and a binary 1 is represented by a positive or negative pulse.The binary 1 pulses must alternate in polarity.
Page 7
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Chapter 6: Error Detection and Correction
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Q1) The use of coding allows a reduction,referred to as the ________,and defined as the reduction in decibels to achieve a specified BER of an error correcting coded system compared to an uncoded system using the same modulation.
A)code rate
B)fixed coding
C)coding gain
D)block code
Q2) The simplest error-detecting scheme is to append a __________ bit to the end of a block of data.
Q3) An error detection code simply detects the presence of an error. .
A)True
B)False
Q4) The ratio of redundant bits to data bits,(n - k)/k ,is called the __________ of the code.
A)redundancy
B)coding gain
C)code rate
D)fixed parity
Q5) The ratio of redundant bits to data bits is called the ________ of the code.
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Chapter 7: Data Link Control Protocols
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Q1) The layer of control that provides error detection and error and flow control is known as a ________ protocol.
Q2) In situations where the bit length of the link is greater than the frame length,serious inefficiencies result.
A)True
B)False
Q3) ________ control refers to mechanisms that detect and correct errors that occur in the transmission of frames.
Q4) In the HDLC frame structure the FCS and flag fields following the data field are referred to as a ________.
A)header
B)trailer
C)bit stuffing
D)information frames
Q5) ________ control is achieved by retransmission of damaged frames that have not been acknowledged or for which the other side requests a retransmission.
Q6) A technique for assuring that a transmitting entity does not overwhelm a receiving entity with data is ________.
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Chapter 8: Multiplexing
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Q1) A form of frequency division multiplexing where the light streaming through the fiber consists of many colors,or wavelengths,each carrying a separate channel of data is ________ multiplexing.
Q2) An individual cable modem subscriber may experience access speeds from 500 kbps to 1.5 Mbps or more,depending on the network architecture and traffic load.
A)True
B)False
Q3) In TDD,data are transmitted in both directions at the same time.
A)True
B)False
Q4) From the carrier's central office to the customer's site is ________.
A)asymmetric
B)upstream
C)headend
D)downstream
Q5) The disadvantage of using echo cancellation is the need for ________ logic on both ends of the line.
Q6) A generic term for sharing the capacity of a data link is ________.
Q7) The digital subscriber line combines FDM and ________ technologies.
Page 10
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Chapter 9: Wan Technology and Protocols
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Q1) A ________ is a general purpose computer running specialized software that turns it into a smart phone switch.These cost significantly less than traditional circuit switches and can provide more functionality.
Q2) Communication via circuit switching involves three phases: circuit establishment,data transfer and ________.
Q3) The packet switching network is a distributed collection of packet switching nodes.Because the nodes are distributed,there is a time delay between a change in status in one portion of the network and knowledge of that change elsewhere.
A)True
B)False
Q4) Circuit switching connections do not appear to attached devices as direct connections.
A)True
B)False
Q5) Circuit switching and packet switching are traditional approaches to wide area network design.
A)True
B)False
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Chapter 10: Cellular Wireless Networks
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Q1) An important design goal for all three generation systems is to limit channel usage to 5 MHz.
A)True
B)False
Q2) The dominant technology for third generation systems is ________.
A)IMT-TC
B)UMTS
C)CDMA
D)TDMA
Q3) ________ occurs when an electromagnetic signal encounters a surface that is large relative to the wavelength of the signal.
A)Scattering
B)Diffraction
C)Reflection
D)Termination
Q4) Scattering effects are difficult to predict.
A)True
B)False
Q5) The key technology for 4G systems is ________.
Q6) First generation cellular networks made use of ________ multiplexing.
Page 12
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Chapter 11: Local Area Network Overview
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Q1) Local Area Networks are usually owned by the organization that is using the network to interconnect equipment.
A)True
B)False
Q2) A ________ consists of a shared transmission medium and a set of hardware and software for interfacing devices to the medium and regulating the orderly access to the medium.
Q3) The tree layout begins at a point known as the ________.
Q4) A ________ is a logical subgroup within a LAN that is created by software rather than physically moving and separating devices.
A)SAN
B)VAN
C)SLAN
D)VLAN
Q5) One simple approach to improving efficiency is to physically partition the LAN into separate broadcast domains.
A)True
B)False
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Chapter 12: Ethernet
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Q1) With ________,a station wishing to transmit first listens to the medium to determine if another transmission is in progress.If the medium is in use,the station must wait.If the medium is idle,the station may transmit.
A)ALOHA
B)transmission backlog delay
C)Ethernet
D)CSMA
Q2) A ________ is an administratively configured broadcast domain consisting of a subset of end stations attached to a LAN.
Q3) For 1 Gbps and 10 Gbps operations the CSMA/CD MAC protocol is used.
A)True
B)False
Q4) Two frames interfering with each other at the receiver so that neither gets through is known as ________.
A)a collision
B)a backlog
C)a backoff
D)scrambling
Q5) For the lower data rates the ________ MAC protocol is used.
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Chapter 13: Wireless Lans
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Q1) The IEEE 802.11 ________ layer includes infrared and spread spectrum and covers a range of data rates.
Q2) OFDM LANs typically operate in either the 2.4-GHz band or the 5- GHz band.
A)True
B)False
Q3) The ________ module includes either bridge or router functionality to link the wireless LAN to the backbone.
Q4) A ________ is a system used to interconnect a set of basic service sets and integrated LANs to create an extended service set.
A)DS
B)MPDU
C)AP
D)MSDU
Q5) IEEE 802.11 defines three services that provide a wireless LAN with secure access and privacy services: authentication,privacy,and ________.
A)deauthentication
B)protected access
C)AP association
D)private access
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Chapter 14: The Internet Protocol
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Q1) A device attached to one of the networks of an internet that is used to support end user applications or services is ________.
A)an end system
B)a router
C)a subnet
D)an intermediate system
Q2) Time to Live is similar to a hop count.
A)True
B)False
Q3) A protocol is concerned with exchanging data between two entities.
A)True
B)False
Q4) The format of the Destination Options Header is the same as that of the Hop-by-Hop Options Header.
A)True
B)False
Q5) Priority could be assigned on a message basis or on a connection basis.
A)True
B)False
Q6) IPv6 addresses are ________ bits in length.
Page 16
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Chapter 15: Transport Protocols
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Q1) Using ________,a sender retransmits a segment before timeout because it infers that the segment was lost.If the sender subsequently receives an acknowledgement that does not cover all of the segments transmitted before this is initiated,the sender may infer that two segments were lost from the current window and retransmit an additional segment.
A)fast retransmit
B)backoff
C)outward data dissemination
D)Karn's Algorithm
Q2) To begin a connection establishment a TS user is in a ________ state.
A)CLOSED
B)LISTEN
C)OPEN
D)ESTAB
Q3) TCP uses a ________ flow control technique.
A)sliding-window
B)upper-layer
C)sequential
D)credit-based
Q4) In TCP the combination of port and host is referred to as a ________.
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Chapter 16: Advanced Data Communications Topics
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Q1) _________ codes are a widely used subclass of nonbinary BCH codes.
Q2) With the exception of the repeat-accumulate code,the LDCP code is systematic.
A)True
B)False
Q3) Special cases of angle modulation are frequency modulation and ________ modulation.
A)VSB
B)repeat-accumulate
C)code rate
D)phase modulation
Q4) Cyclic codes can be easily encoded and decoded using __________ registers.
Q5) The _________ is the ratio of the amplitude of the input signal to the carrier.
A)modulation index
B)frequency phase
C)division rate
D)none of the above
Q6) Modulation does not permit frequency-division multiplexing.
A)True
B)False
Q7) Bose-Chaudhuri-Hocquenghem is an example of a _________ code.
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Chapter 17: Wireless Transmission Techniques
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Q1) There are two applications of MU-MIMO: Uplink--Multiple Access Channel,MAC and
Q2) The essential idea of the ________ technique is to spread the information signal over a wider bandwidth to make jamming and interception more difficult.
Q3) MIMO systems are characterized by the number of antennas at each end of the wireless channel.
A)True
B)False
Q4) With ________ it is possible to simultaneously transmit either from or to different users by allocating the subcarriers during any one-time interval to multiple users.
A)OFDMA
B)SC-FDMA
C)SC-TDMA
D)all of the above
Q5) The IFFT operation has the effect of ensuring that the subcarriers do not interfere with each other.
A)True B)False
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Chapter 19: Routing
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Q1) Due to the large amounts of bandwidth available on modem networks,processing and transmission overhead is a management issue and does not impair network efficiency.
A)True
B)False
Q2) "Given a network of nodes connected by bidirectional links,where each link has a cost associated with it in each direction,define the cost of a path between two nodes as the sum of the costs of the links traversed. For each pair of nodes,find a path with the lowest cost" is a description of ________.
A)least cost routing
B)random routing
C)fixed routing
D)alternate routing
Q3) ________ is determined by whether the routing decision is made on a packet or virtual circuit basis.
A)Place
B)Update timing
C)Decision time
D)VCC
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Chapter 20: Congestion Control
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Q1) For ________ congestion avoidance,the network alerts end systems to growing congestion within the network and the end systems take steps to reduce the offered load to the network.
A)backpressure
B)explicit
C)implicit
D)dynamic
Q2) The objective of __________ is to maintain the number of packets within the network below the level at which performance falls off dramatically.
A)fast restraint
B)traffic management
C)window management
D)congestion control
Q3) ________ is an effective congestion control technique in connectionless,or datagram,configurations,such as datagram packet-switching networks and IP-based internets.
Q4) ________ discriminates between incoming packets that conform to QoS agreement and those that don't.
Q5) ________ algorithm addresses RTT variance estimation.
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Chapter 21: Internetwork Operation
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Q1) IGMP _____ enabled a host to request to be unsubscribed from a group.
A)v1
B)v2
C)v3
D)v4
Q2) A host or a router is a(n)_________ .
A)link
B)node
C)action
D)foreign agent
Q3) A ________ is a host or router that changes its point of attachment from one network or subnetwork to another.
Q4) Intermediate results sent to all participants is _________ .
A)real-time workgroup
B)multimedia
C)distributed computation
D)teleconferencing
Q5) The __________ is an index that identifies a security context between a pair of nodes which is configured so that the two nodes share a secret key and parameters relevant to this association.
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Chapter 22: Internetwork Quality of Service
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Q1) A key task of an internet is to deliver data from a source to one or more destinations with the desired QoS.
A)True
B)False
Q2) In the ________ strategy,the source system knows the location of each member of the multicast group so the source need only send packets to those networks that contain members of the group.
Q3) The ________ is the most demanding service provided by ISA.
Q4) The ________ is intended to provide QoS transport over IP-based internets.
A)AS
B)PHB
C)ISA
D)IRP
Q5) In times of congestion elastic traffic will continue to supply a high load and inelastic traffic will be crowded off.
A)True
B)False
Q6) A receiver joins a multicast group by sending an ________ join message to a neighboring router.
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Chapter 23: Multiprotocol Label Switching
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Q1) A routing algorithm develops information that can be used in determining how to handle packets with different service needs.
A)True
B)False
Q2) MPLS is an enhancement that does not require an upgrade to IP routers to support its features.
A)True
B)False
Q3) Prior to the routing and delivery of packets in a given FEC,a path through the network,known as a ________,must be defined and the QoS parameters along that path must be established.
Q4) The MPLS architecture supports two routing options: hop-by-hop and ________.
Q5) With a ________ the traffic of a given enterprise or group passes transparently through an internet in a way that effectively segregates that traffic from other packets on the internet.
A)LDP
B)MPLS
C)LSP tunnel
D)VPN
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Chapter 24: Electronic Mail, dns, and Http
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Q1) The header section is not always present in a DNS message.
A)True
B)False
Q2) SMTP standardizes the message character set as 7-bit ASCII.
A)True
B)False
Q3) Interoperability is required among the MTA components along the transfer path through the MHS.
A)True
B)False
Q4) Typically,the ________ function is housed in the user's computer and is referred to as a client e-mail program or a local network e-mail server.
A)MDA
B)MHS
C)MUA
D)MTA
Q5) __________ is a facility that allows users at workstations and terminals to compose and exchange messages.
Q6) The Internet mail architecture is currently defined in RFC _______ .
Page 25
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Chapter 25: Internet Multimedia Support
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Q1) RFC 3550 outlines ________ as a function performed by RTCP.
A)QoS and congestion control
B)identification
C)session control
D)all of the above
Q2) SIP supports five facets of establishing and terminating multimedia communications: user location,user availability,session setup,session management,and
Q3) A _________ is any network element that sends SIP requests and receives SIP responses.
Q4) The ___________ Protocol describes the content of sessions,including telephony,Internet radio,and multimedia applications.
Q5) Real-time applications are more concerned with timing issues.
A)True
B)False
Q6) An application-level firewall may prevent the forwarding of RTP packets.
A)True
B)False
Q7) _____ real-time applications can tolerate the loss of some portion of the communicated data.
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