Computer Networks
Exam Review
Course Introduction
Computer Networks is an in-depth course that explores the fundamental concepts and architectural principles behind modern computer networking. It covers topics such as network models, protocols, transmission media, switching, routing, congestion control, network security, and wireless communication. Through theoretical study and practical exercises, students will gain an understanding of how data travels across local and wide area networks, the role of protocols at each layer of the OSI and TCP/IP models, and how networking technologies enable reliable and efficient data communication. The course prepares students to analyze network operations, troubleshoot common networking issues, and understand the critical infrastructure that supports the internet and organizational connectivity.
Recommended Textbook
Network+ Guide to Networks 5th Edition by Tamara Dean
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748 Verified Questions
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Page 2
Chapter 1: An Introduction to Networking
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Sample Questions
Q1) Describe the advantages client/server networks offer over peer-to-peer networks. Answer: Although client/server networks are typically more complex in their design and maintenance than peer-to-peer networks,they offer many advantages over peer-to-peer networks,such as:
·User logon accounts and passwords for anyone on a server-based network can be assigned in one place.
·Access to multiple shared resources (such as data files or printers)can be centrally granted to a single user or groups of users.
·Problems on the network can be monitored,diagnosed,and often fixed from one location.
·Servers are optimized to handle heavy processing loads and dedicated to handling requests from clients,enabling faster response time.
·Because of their efficient processing and larger disk storage,servers can connect more than a handful of computers on a network. Together,these advantages make client/server networks easier to manage,more secure,and more powerful than peer-to-peer networks.They are also more scalablethat is,they can be more easily added onto and extended - than peer-to-peer networks.
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Chapter 2: Network Standards and the OSI Model
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Sample Questions
Q1) Generates signals as changes in voltage at the NIC.
Answer: I
Q2) Which Data Link sublayer manages access to the physical medium?
A) LLC
B) MAC
C) Management layer
D) Addressing layer
Answer: B
Q3) The ____ is a specialized United Nations agency that provides developing countries with technical expertise and equipment to advance those nations' technological bases.
A) ANSI
B) ISO
C) ITU
D) ISOC
Answer: C
Q4) Produces guidelines for how network cable should be installed in commercial buildings.
Answer: B
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Page 4
Chapter 3: Transmission Basics and Networking Media
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Sample Questions
Q1) Describe what FDM (frequency division multiplexing)is and how it works.
Answer: FDM (frequency division multiplexing)is a type of multiplexing that assigns a unique frequency band to each communications subchannel.Signals are modulated with different carrier frequencies,then multiplexed to simultaneously travel over a single channel.The first use of FDM was in the early 20th century when telephone companies discovered they could send multiple voice signals over a single cable.That meant that rather than stringing separate lines for each residence (and adding to the urban tangle of wires),they could send as many as 24 multiplexed signals over a single neighborhood line.Each signal was then demultiplexed before being brought into the home.
Q2) Explain the makeup of twisted pair wire.
Answer: Twisted pair cable consists of color-coded pairs of insulated copper wires,each with a diameter of 0.4 to 0.8 mm (approximately the diameter of a straight pin).Every two wires are twisted around each other to form pairs,and all the pairs are encased in a plastic sheath.The number of pairs in a cable varies,depending on the cable type.
Q3) Technology used to modify analog signals to make them suitable for carrying data over a communication path.
Answer: B
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Chapter 4: Introduction to TCP/IP Protocols
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Sample Questions
Q1) ____ ARP table entries are created when a client makes an ARP request that cannot be satisfied by data already in the ARP table.
A) Static
B) Dynamic
C) Temporary
D) On-demand
Q2) Ports ranging from 49152 through 65535; open for use without restriction.
Q3) ____ is more efficient than TCP for carrying messages that fit within one data packet.
A) IP
B) UDP
C) ICMP
D) IGMP
Q4) In IPv4 addressing,eight bits have 256 possible combinations.Only the numbers 1 through 254 can be used to identify networks and hosts in an IP address.Explain what the number 0 and the number 255 are used for in IPv4 addressing.
Q5) Protocols that can span more than one LAN (or LAN segment)are ____________________,because they carry Network layer addressing information that can be interpreted by a router.
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Chapter 5: Topologies and Ethernet Standards
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Sample Questions
Q1) Explain the 5-4-3 rule of networking.
Q2) The 10-gigabit fiber optic standard with the shortest segment length is ____.
A) 10GBase-T
B) 10GBase-SR
C) 10GBase-LR
D) 10GBase-ER
Q3) A network's access method is its method of controlling how network nodes access the communications channel.
A)True
B)False
Q4) The Ethernet_II frame type contains a 2-byte ____ field which differentiates it from the older Ethernet_802.3 and Ethernet_802.2 frame types.
A) data
B) length
C) source
D) type
Q5) Follows the 5-4-3 rule of networking.
Q6) Explain how the distributed backbone is connected.Include a description of its benefits.
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Chapter 6: Network Hardware
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Sample Questions
Q1) Devices that connect two network segments by analyzing incoming frames and making decisions about where to direct them based on each frame's MAC address.
Q2) A computer's ____________________ is the circuit,or signaling pathway,used by the motherboard to transmit data to the computer's components,including its memory,processor,hard disk,and NIC.
Q3) A(n)____________________ NIC is integrated into the motherboard.
Q4) External peripheral device specifying 32-bit interface running at 33 MHz.
Q5) By far,the most popular expansion board NIC is one that uses a(n)____ bus. A) onboard
B) PCI
C) ExpressCard
D) ISA
Q6) Explain why network engineers value VLANs.Include a discussion on reasons for using VLANs.
Q7) Explain hybrid routing protocols.Describe an example.
Q8) A switch running in this mode reads a frame's header and decides where to forward the data before it receives the entire packet.
Page 8
Q9) Connectivity device that subdivides a network into smaller logical pieces.
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Chapter 7: WANs and Remote Connectivity
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Sample Questions
Q1) In a star topology,a single connection failure will halt all traffic between all sites.
A)True
B)False
Q2) ____ networking refers to dialing directly into a private network's or ISP's remote access server to log on to a network.
A) Remote
B) Direct
C) Dial-up
D) Virtual
Q3) Broadband cable requires many subscribers to share the same local line,thus raising concerns about ____ and actual (versus theoretical)throughput.
A) access
B) costs
C) noise
D) security
Q4) Occurs when downstream throughput is higher than upstream throughput.
Q5) Describe the fundamental properties WANs and LANs have in common.
Q6) Describe an important difference between frame relay and X.25.
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Chapter 8: Wireless Networking
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Sample Questions
Q1) The ______________________________ is a unique character string used to identify an access point.
Q2) Using Bluetooth version 2.0,communicating nodes can be as far as ____ meters apart.
A) 30
B) 100
C) 300
D) 330
Q3) If intermittent and difficult-to-diagnose wireless communication errors occur,____ might be the culprit.
A) incorrect encryption
B) SSID mismatch
C) interference
D) incorrect antenna placement
Q4) In ____ wireless systems,the result is a point-to-point link.
A) mobile
B) variable
C) fixed
D) open
Q5) Describe how interference can distort and weaken a wireless signal.
Page 10
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Chapter 9: Network Operating Systems
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Sample Questions
Q1) Naming (or addressing)conventions in Active Directory are based on the ____ naming conventions.
A) SMB
B) LDAP
C) NTFS
D) NFS
Q2) A(n)____ is a pictorial representation of computer functions that,in the case of NOSs,enables administrators to manage files,users,groups,security,printers,and so on.
A) snapshot
B) shortcut
C) icon
D) GUI
Q3) Describe the UNIX memory model in terms of addressing scheme and virtual memory.
Q4) UNIX was one of the first operating systems to implement a ____ file system.
A) virtual
B) logical
C) physical
D) hierarchical
Q5) A client/server environment that incorporates middleware.
Page 11
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Chapter 10: In-Depth TCP/IP Networking
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Sample Questions
Q1) Explain how hiding IP addresses on private networks allows network managers more flexibility in assigning addresses.
Q2) A class ____ network class is reserved for special purposes.
A) A
B) B
C) C
D) D
Q3) The TCP/IP configuration and management utility used on UNIX and Linux systems.
Q4) The result from ANDing 11001111 with 10010001 is ____.
A) 11001111
B) 10010001
C) 10000001
D) 00000001
Q5) IMAP (Internet Message Access Protocol)is a mail retrieval protocol that was developed as a more sophisticated alternative to ____.
A) POP3
B) POP
C) SMTP
D) MIME
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Chapter 11: Voice and Video Over IP
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Sample Questions
Q1) Describe five capabilities to which SIP is limited.
Q2) How does implementing VoIP assist in centralizing voice and data network management?
Q3) A computer that provides support for multiple H.323 terminals and manages communication between them.
Q4) Many VoIP vendors prefer ____________________ over H.323.
Q5) The nerve center for networks that adhere to H.323.
Q6) Describe six functions performed by signaling protocols.
Q7) Explain why UDP is preferred over TCP for real-time applications such as telephone conversations and videoconferences.
Q8) Attempts to reserve a specific amount of network resources for a transmission before the transmission occurs.
Q9) ____ is preferred over TCP for real-time applications such as telephone conversations and videoconferencing.
A) RTP
B) UDP
C) RTCP
D) SIP
Page 13
Q10) Any node that provides audio,visual,or data information to another node.
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Chapter 12: Network Security
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Sample Questions
Q1) By default,the 802.11 standard offers substantial security.
A)True
B)False
Q2) A ____ main function is to examine packets and determine where to direct them based on their Network layer addressing information.
A) switch's
B) gateway's
C) router's
D) proxy server's
Q3) The host that runs the proxy service.
Q4) The use of certificate authorities to associate public keys with certain users is known as ____.
A) PGP
B) PKI
C) IPSec
D) SSL
Q5) Software that can react to suspicious activity.
Q6) ____________________ is the use of an algorithm to scramble data into a format that can be read only by reversing the algorithm.
Page 14
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Chapter 13: Troubleshooting Network Problems
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Sample Questions
Q1) Occurs when two or more stations are transmitting simultaneously.
Q2) Also know as a linemans handset.
Q3) Most wireless testing tools contain more powerful antennas than a workstation NIC.
A)True
B)False
Q4) Network engineers today might call any protocol analyzer tool a sniffer or ____________________.
Q5) Continuity testers can test only copper cable.
A)True
B)False
Q6) A ____ can be used to intercept a telephone conversation.
A) sniffer
B) protocol analyzer
C) network monitor
D) butt set
Q7) An instrument used to measure impedance,resistance,and voltage on a wire.
Q8) Captures traffic and analyzes frames.
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Q9) A help desk is typically staffed with ____________________ - people proficient in workstation and network troubleshooting.
Chapter 14: Ensuring Integrity and Availability
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Q1) A(n)____ is a deviation from a specified level of system performance for a given period of time.
A) fault
B) failure
C) error
D) hoax
Q2) Define and describe a virus.
Q3) ____ is intended to eliminate single points of failure.
A) Availability
B) Redundancy
C) Contingency
D) Integrity
Q4) A momentary decrease in voltage.
Q5) Explain the concept of a backup strategy and provide a list of eight questions the strategy should address.
Q6) Protection against harmful code involves more than just installing anti-malware software.
A)True
B)False
Q7) Describe how an organization implements anti-malware software.
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Chapter 15: Network Management
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Sample Questions
Q1) ____is the local storage of frequently needed files that would otherwise be obtained from an external source.
A) Swapping
B) Paging
C) Caching
D) Segmentation
Q2) A patch is a replacement for an entire software package.
A)True
B)False
Q3) The definition of managed devices and their data are collected in a(n)________________________________________.
Q4) The process of reverting to a previous version of software after attempting to upgrade it is known as ____.
A) backleveling
B) reverse engineering
C) downgrading
D) change back
Q5) Describe how to select an asset management tool.
Q6) Explain how to perform a client software upgrade.
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