Telecomm and Wireless Communications - D413 WGU questions and answers with 100% accuracy (2026-2027 latest update)

10Base2

Classification that specifies the use of RG-58 cable and a data rate of 10 Mbps. (2)

10Base5

First IEEE 802.3 classification developed for Ethernet. (2)

10BaseT

Classification specifies the use of the diff erent categories of UTP cable. (2)

6to4

Mechanism that provides a means of communicating across the IPv4 Internet while preserving the orig-inal IPv6 assigned address of the network device. (10)

A+ Certification

Designed to test a person's knowledge related to PC support and repair; pronounced A-plus. (20)

AAA proxy

Network device that acts as an intermediary to exchange secu-rity packets between the AAA server and the AAA client. (15)

absorption

Occurs when intervening material absorbs some of the signal. (3)

access method

Method of gaining ac-cess to the network media. (6)

access port

Hub connection to which each network cable is connected. (1)

acoustical echo

Condition that takes place when a microphone and a speaker are in close proximity or the audio is improperly adjusted, causing feedback. (12)

ACPI Component Architecture (ACPICA)

Extension to the original ACPI standard. (9)

Active Directory (AD)

Windows Server standard used to manage large and small network systems. (7)

active hub

Enhanced passive hub; also called an intelligent hub or switch. (1)

active partition

Describes the partition that contains the operating system files the computer should use to boot. (17)

adaptive cut-through

Frame-forwarding technique that operates as cut-through until an unaccept-able number of corrupt frames are detected. (11)

Address Resolution Protocol (ARP)

Communication protocol that resolves an assigned IPv4 network address to a physical address (MAC address). (6)

Address Resolution Protocol (ARP)

Used to map the host MAC address to the logical host IP address. (10)

ad hoc mode

Wireless network arrangement in which a wireless access point is not present. (4)

administrative server

Administers network security and activities. (1)

alien crosstalk (AXT)

Measurement of noise introduced outside the cable jacket, typically caused by other net-work cables in close proximity. (2)

American National Standards Institute (ANSI)

Private, nonprofit organization that does not develop standards, but rather prompts voluntary conformity and standardization. (1)

American Standard Code for Information Interchange (ASCII)

Early attempt to standard-ize data codes. (5)

amplifier

Electronic device designed to raise a signal's amplitude. (2)

analog signal

Signal that has a contin-uous range of values, much like a wave. (2)

analog-to-digital converter (ADC)

Computer chip designed to change an analog signal to a digital signal. (12)

anonymous FTP site

Allows anyone to access the site and download or upload files. (13)

ANT+

Function that can be added to base ANT protocols that allows for interoperability; pronounced ant plus. (4)

anycast address

IPv6 address that delivers packets to the nearest in-terface; mainly used for supporting router functions. (10)

application gateway

Provides security for specific applications such as FTP and Telnet. (15)

application layer

Interfaces directly to and performs common application services for the application process-es; layer seven of the OSI model. (1)

archive bit

Identifies if a file has changed since the last full or incremental backup. (16)

asymmetric-key encryption

Encryption method that uses two keys: a private key and a public key; also known as public-key cryptography. (15)

asynchronous transfer mode (ATM)

Protocol designed especially for transmitting data, voice, and video. (1)

asynchronous transmission

Data transmission method in which no reference signal is present. (5)

attenuation

Loss of signal strength. (1)

auditing

Service that tracks the events, use, and access of network resources and writes these actions to a log. (7)

authentication

Process used to identify a user and ensure the user is who he or she claims to be; also known as local authentication. (15)

authentication, authorization, and accounting (AAA)

Security standard that consists of three parts: authentication, authorization, and accounting; also known as triple A. (15)

Automatic Configuration and Power Interface (ACPI)

Standard for controlling the power options for computer hardware devices. (9)

automatic medium-dependent interface crossover (Auto-MDIX)

Electronic chip technology incorpo-rated into Gigabit Ethernet devices to automatically reassign pin func-tions and eliminate the need for a crossover cable. (2)

Automatic Private IP Addressing (APIPA)

Feature that assigns an IP address from a special set of IP ad-dresses that have been set aside by IANA when a DHCP server cannot be reached. (10)

available bit rate (ABR)

ATM data transfer classification most appro-priate for file transfer because it uses the available bit rate associated with the networking medium. (12)

average utilization

Measurement of the average amount of utilization or traffic on a network in a given monitoring period. (16)

AWG rating

Describes the size of a conductor's diameter. (2)

backbone

Connects the telecommuni-cation closets, equipment rooms, and main entrance facility. (18)

backdoor

Software access port to a computer infected by a Trojan horse

backplane

Simple motherboard designed with minimal components. (9)

bandwidth

Measurement of the network media's ability to carry data. (2)

Bandwidth Allocation Protocol (BAP)

Allows the number of lines used by MLPPP to change on demand. (14)

bandwidth shaper

Used to prioritize network packets to ensure quality of service for time-sensitive applica-tions such as VoIP; also known as a traffic shaper. (12)

baseband

Method of transmitting data in the form of a digital signal, using the entire bandwidth of a cable. (2)

baseline

Measurement of performance characteristics that can be used at a later date to determine if the network or server is performing satisfactorily. (16)

basic disk

Term applied to the old system of hard disk drive configuration. (7)

Basic Rate ISDN (BRI-ISDN)

ISDN cat-egory that consists of three conduc-tors: two B channels, referred to as bearer channels, and one D channel, referred to as the delta channel. (14)

basic service set (BSS)

Group of wireless devices connected as a network. (4)

biometrics

Science of using unique physical features of a person to con-firm that person's identification for authentication purposes. (15)

bipolar digital signal

Digital signal that fluctuates between a positive five-volt level and a negative five-volt level. (5)

bit rate

Number of bits used to repre-sent the amplitude of the analog signal. (12)

blackout

Total loss of electrical energy. (16)

blade server

Extremely thin server designed to allow a large number of servers to be mounted in a small space. (9)

Bluetooth

Short-range, wireless system that is designed for limited distances. (4)

boot loader

Program that starts an op-erating system load process. (8)

boot partition

Contains the files needed to operate the computer. (17)

Border Gateway Protocol (BGP)

Internet routing protocol that supports the exchange of routing information between autonomous networks. (11)

bridge

Can be used to divide the network into smaller segments, reducing the chance of collisions. (1)

broadband

Method of transmitting data in the form of several analog signals at the same time. (2)

Broadband ISDN (B-ISDN)

ISDN category designed to carry multiple frequencies. (14)

broadcast frame

Frame in which the destination address is filled with all ones; intended for every computer on a network. (5)

broadcast storm

Occurs when the number of collisions reaches a point that the network is flooded with a continuous number of collisions and rebroadcasts. (6)

brouter

Combines router and bridge functions. (1)

brownout

Partial loss of electrical energy. (16)

bug

Software program error. (16) bus topology. Network topology that uses a single cable or conductor to connect all nodes on the network. (1)

business plan

outlines the goals for the business and includes action plans and a timetable for meeting those goals. (20)

carrier wave

Electromagnetic wave of a set frequency that is used to carry data. (4

carrier-sense multiple access with collision avoidance (CSMA/CA)

Media access method that works much like CSMA/CD but tries to avoid, rather than detect, collisions. (2)

carrier-sense multiple access with collision detection (CSMA/CD)

Media access method used by Ether-net networks to control and ensure data delivery. (2)

cascading style sheets (CSS)

Style-sheet language that defines the presentation and layout of all pages in a website. (13)

cell

Area that is served by a radio access tower. (1)

cellular technology

Based on radio waves connecting to designated areas referred to as cells. (4)

centralized administration

Administration model in which the administrator does not have to go to each server to perform administra-tive tasks. (1)

certificate authority (CA)

Service that contains the security list of users authorized to access the private key owner's messages, using a public key. (15)

Challenge Handshake Authentication Protocol (CHAP)

Authentication protocol that sends an encrypted string of characters representing the user name and password. (15)

channel

Bandwidth of a carrier wave. (4)

channel bonding

Method whereby two or more links are combined. (4)

Channel Service Unit/Data Service Unit (CSU/DSU)

Converts signals from the LAN into signals that can be carried by the T1 line, and vice versa. (14)

circuit switching

Data-routing method that establishes a permanent connection between two points for the duration of the data transfer period. (5)

circuit-level gateway

Monitors a connection until the connection is successfully established between the destination and source hosts. (15)

Cisco Discovery Protocol (CDP)

Variation of LLDP designed to sup-port equipment such as Cisco rout-ers, switches, and telephones. (6)

Class A network

Can support up to 16 million hosts on each of 127 net-works. (10)

Class B network

Supports up to 65,000 hosts on each of 16,000 networks. (10)

Class C network

Supports 254 hosts on each of 2 million networks. (10)

Classless Inter-Domain Routing (CIDR)

Uses a special notation to identify which part of an IP address is the network portion. (11)

client/server network

Consists of computers connected via a network to one or more servers. (1)

cluster

Group of servers that share the network demand. (16)

coaxial cable

Consists of a copper-core conductor surrounded by an insu-lator referred to as a dielectric; also known as coax cable. (2)

codec

Term used to represent software, hardware, or combination of soft-ware and hardware that compress and decompress video and audio information; name stems from compressor/decompressor. (12)

cold spare

Any compatible disk drive that is in storage and is used to replace a failed disk drive. (16)

collision domain

Section of a network where collisions occur; also known as a contention domain. (6)

command prompt

Text-based interface in which commands are typed and entered in a command-line environ-ment. (6)

command syntax

Correct manner and arrangement in which a command is to be typed. (6)