Data Communications and Networking Exam Review

Course Introduction

Data Communications and Networking provides a comprehensive overview of the principles and practices involved in digital communication and computer networks. The course covers fundamental concepts such as data transmission, network topologies, protocols, and architectures, as well as both wired and wireless networking technologies. Students will learn about the OSI and TCP/IP models, error detection and correction methods, multiplexing, switching techniques, and network security basics. Real-world applications, network troubleshooting, and emerging trends in networking are also discussed, equipping students with the knowledge necessary to understand and manage modern communication systems.

Recommended Textbook Network+ Guide to Networks 5th Edition by Tamara Dean

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15 Chapters

748 Verified Questions

748 Flashcards

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Chapter 1: An Introduction to Networking

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Sample Questions

Q1) Describe four benefits of becoming certified.

Answer: Following are a list of benefits to becoming certified:

·Better salary - Professionals with certification can usually ask for higher salaries than those who aren't certified.Employers will also want to retain certified employees,especially if they helped pay for their training,and will offer incentives to keep certified professionals at the company.

·Greater opportunities - Certification may qualify you for additional degrees or more advanced technical positions.

·Professional respect - After you have proven your skills with a product or system,your colleagues and clients will gain great respect for your ability to solve problems with that system or product.They will therefore feel confident asking you for help.

·Access to better support - Many manufacturers reward certified professionals with less expensive,more detailed,and more direct access to their technical support.

Q2) The part of a network to which segments and significant shared devices connect. Answer: B

Q3) The means through which data is transmitted and received.

Answer: F

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Chapter 2: Network Standards and the OSI Model

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Sample Questions

Q1) Describe a network address including its addressing scheme,formats and alternate names.

Answer: Network addresses follow a hierarchical addressing scheme and can be assigned through operating system software.They are hierarchical because they contain subsets of data that incrementally narrow down the location of a node,just as your home address is hierarchical because it provides a country,state,ZIP code,city,street,house number,and person's name.Network layer address formats differ depending on which Network layer protocol the network uses.Network addresses are also called network layer addresses,logical addresses,or virtual addresses.

Q2) A professional membership society that helps to establish technical standards for the Internet.

Answer: D

Q3) Which OSI model layer initiates the flow of information?

A) Physical

B) Session

C) Application

D) Presentation

Answer: C

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Chapter 3: Transmission Basics and Networking Media

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Sample Questions

Q1) Describe a drawback of analog signals.

Answer: One drawback to analog signals is that their voltage is varied and imprecise.Thus,analog transmission is more susceptible to transmission flaws such as noise,or any type of interference that may degrade a signal,than digital signals.

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) Describe two benefits of digital signaling that make it worthwhile even though extra signaling pulses are involved.

Answer: Because digital transmission involves sending and receiving only a pattern of 1s and 0s,represented by precise pulses,it is more reliable than analog transmission,which relies on variable waves.In addition,noise affects digital transmission less severely.

Q4) Transmission that involves one transmitter and multiple,undefined receivers. Answer: E

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Page 5

Chapter 4: Introduction to TCP/IP Protocols

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Sample Questions

Q1) In dotted decimal notation,a(n)____ separates each decimal.

A) dash

B) slash

C) colon

D) period

Q2) Whether connecting to the Internet or to another computer within a LAN,every node on a network must have a unique ____________________.

Q3) Describe the Time to Live (TTL)field in an IP datagram.

Q4) Define and describe Zeroconf (Zero Configuration).

Q5) Explain one way in which BOOTP and RARP are similar.Then describe two ways in which they are different.

Q6) A(n)____________________ is a special 32-bit number that,when combined with a device's IP address,informs the rest of the network about the segment or network to which the device is attached.

Q7) TCP is a(n)____ subprotocol.

A) open-ended

B) indiscriminating

C) connection-oriented

D) connectionless

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Chapter 5: Topologies and Ethernet Standards

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Sample Questions

Q1) Also known as Gigabit Ethernet.

Q2) As part of CSMA/CD,a process known as ____________________ allows the NIC issue a special 32-bit sequence that indicates to the rest of the network nodes that its previous transmission was faulty and that those data frames are invalid.

Q3) Without ____,a bus network would suffer from signal bounce.

A) hubs

B) repeaters

C) terminators

D) jamming

Q4) Explain how the star-wired bus topology works.Include a description of its drawbacks and benefits.

Q5) ____________________ is a component of a network's logical topology that determines how connections are created between nodes.

Q6) Explain why it is important to understand logical topologies.

Q7) The 10-gigabit fiber optic standard with the shortest segment length is ____.

A) 10GBase-T

B) 10GBase-SR

C) 10GBase-LR

D) 10GBase-ER

Page 7

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Chapter 6: Network Hardware

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Sample Questions

Q1) Describe how a bridge translates between two segment types.

Q2) Uses the IEEE 1394 standard.

Q3) It is best to perform connectivity tests on a computer connected to a live network.

A)True

B)False

Q4) Plugs into a port and crosses over the transmit line to the receive line so that outgoing signals can be redirected into the computer for testing.

Q5) The ____ is a simple set of instructions that enables a computer to initially recognize its hardware.

A) BIOS

B) Firmware

C) EEPROM

D) Driver code

Q6) Describe a distance-vector routing protocol suited to WANs.

Q7) A(n)____________________ NIC is integrated into the motherboard.

Q8) Describe advantages of VLAN trunking.

Q9) Describe how a computer's bus can be expanded to include devices other than those found on the motherboard.

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Chapter 7: WANs and Remote Connectivity

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Sample Questions

Q1) Describe two important considerations when designing a VPN.

Q2) At the customer's demarcation point,either inside or outside the building,T-carrier wire pairs terminate with a ____.

A) terminal adapter

B) smart jack

C) CSU/DSU

D) switch

Q3) Occurs when data travels from the carrier's switching facility to the customer.

Q4) WANs typically send data over ____ available communications networks.

A) privately

B) publicly

C) individually

D) serially

Q5) A PSTN offers ____ security.

A) exceptional

B) marginal

C) expanded

D) dedicated

Q6) Occurs when each site is directly connected to no more than two other sites in a serial fashion.

Page 9

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Chapter 8: Wireless Networking

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Sample Questions

Q1) Places where wireless Internet access is available to the public are called ____________________.

Q2) ____ may use either the 2.4-GHz or 5-GHz frequency range.

A) 802.11a

B) 802.11b

C) 802.11g

D) 802.11n

Q3) Boasts a maximum throughput of 600 Mbps.

Q4) An 802.11g antenna has a geographic range of ____ meters.

A) 20

B) 100

C) 300

D) 330

Q5) WiMAX is defined by the IEEE 802.11 standard.

A)True

B)False

Q6) If a station detects the presence of several access points,it will always choose the closest access point.

A)True

B)False

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Chapter 9: Network Operating Systems

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Q1) The most privileged user account on an NOS is the ____________________.

Q2) A benefit to using an NTFS partition is that it can be read by older operating systems,such as Windows 95,Windows 2000 Professional,and early versions of UNIX.

A)True

B)False

Q3) ____ is one of the most important functions an NOS provides.

A) Client support

B) Printer sharing

C) Authentication

D) Memory management

Q4) The directory containing information about objects in a domain resides on computers called ____ controllers.

A) OU

B) domain

C) database

D) server

Q5) A protocol used to access information stored in a directory.

Q6) A licensing mode that allows a fixed quantity of clients to use one software package simultaneously.

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) In classful addressing,Class C IPv4 address host information is located in the ____.

A) last 8 bits

B) last 16 bits

C) first 8 bits

D) first 16 bits

Q4) On a network using TCP/IP,some nodes may use multiple IP addresses.

A)True

B)False

Q5) ________________________________________ is the protocol responsible for moving messages from one mail server to another over TCP/IP-based networks.

Q6) Useful only on networks that run Windows-based operating systems and NetBIOS.

Page 12

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Chapter 11: Voice and Video Over IP

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Q1) A(n)____ is a computer that manages multiple media gateways.

A) MPLS

B) MGCP

C) MEGACO

D) MGC

Q2) Ensures that the type of information issued to an H.323 terminal is formatted in a way that the H.323 terminal can interpret.

Q3) A computer that provides support for multiple H.323 terminals and manages communication between them.

Q4) ____ is preferred over TCP for real-time applications such as telephone conversations and videoconferencing.

A) RTP

B) UDP

C) RTCP

D) SIP

Q5) Explain the issue regarding the need for electric current that IP telephones face.

Q6) ____________________ performs the same functions as MGCP,but using different commands and processes.

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Chapter 12: Network Security

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Q1) A(n)____________________ identifies an organization's security risks,levels of authority,designated security coordinator and team members,responsibilities for each team member,and responsibilities for each employee.

Q2) A security policy should state exactly which hardware,software,architecture,or protocols will be used to ensure security.

A)True

B)False

Q3) A VPN ____ authenticates VPN clients and establishes tunnels for VPN connections.

A) router

B) service

C) concentrator

D) certificate authority

Q4) A firewall that can view a data stream.

Q5) Encryption is the last means of defense against data theft.

A)True

B)False

Q6) Describe who should conduct a security audit and advantages,if any.

Q7) Describe the SCP (Secure CoPy)utility.

Page 14

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Chapter 13: Troubleshooting Network Problems

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Sample Questions

Q1) Also know as a linemans handset.

Q2) Describe how a network administrator should react upon discovering that a network change has generated a problem.

Q3) A ____ can generate traffic in an attempt to reproduce a network problem and monitor multiple network segments simultaneously.

A) multimeter

B) cable performance tester

C) network monitor

D) protocol analyzer

Q4) Logical connectivity problems often prove more difficult to isolate and resolve than physical connectivity problems.

A)True

B)False

Q5) Some software errors point to a physical connectivity problem.

A)True

B)False

Q6) Describe four ways a network professional might use a multimeter.

Q7) Take place outside the window of time in which they would normally be detected by the network and redressed.

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Chapter 14: Ensuring Integrity and Availability

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Sample Questions

Q1) Fluctuation in voltage levels caused by other devices on the network or electromagnetic interference.

Q2) Generators provide surge protection.

A)True

B)False

Q3) A place where the computers,devices,and connectivity necessary to rebuild a network exist,and all are appropriately configured,updated,and connected to match your network's current state.

Q4) A ____ is a program that runs automatically,without requiring a person to start or stop it.

A) virus

B) worm

C) bot D) Trojan horse

Q5) The goal of fault-tolerant systems is to prevent failures from progressing to faults.

A)True

B)False

Q6) A complete power loss.

Q7) Describe a backup rotation scheme and explain the goal of a good scheme.

Page 16

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Chapter 15: Network Management

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Sample Questions

Q1) Describe the preparation and implementation requirements when upgrading a networked printer.

Q2) Describe the preparation and implementation requirements when upgrading a hub or access point.

Q3) A patch is a replacement for an entire software package.

A)True

B)False

Q4) For a cabling upgrade,the best way to ensure that future upgrades go smoothly is to carefully document the existing cable after making any upgrades.

A)True

B)False

Q5) Explain how to gather baseline data on a network.

Q6) The more data you gather while establishing your network's baseline,the less accurate your prediction will be.

A)True

B)False

Q7) Part of the TCP/IP suite of protocols and typically runs over UDP on port 161.

Q8) Stores results from devices monitoring conditions in UNIX or Linux-based networks.

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