WGU D413 Telecomm and Wireless Communications Test Actual Exam Questions and Verified Correct Solutions Exam 2026/2027 Version

WGU D413 WGU D413 Telecomm and Wireless Communications Test Actual Exam Questions and Verified Correct Solutions Exam 2026/2027 Version What is bandwidth? The maximum theoretical capacity of a network communication link The instantaneous data-sending rate of network data transmission The difference between the highest and lowest frequency of data signals The length of time for a signal wave to complete one complete cycle The maximum theoretical capacity of a network communication link Which factor contributes to signal attenuation? Noise Short travel distance Bandwidth Network congestion Noise Which term is defined as the number of cycles a signal completes in one second? Frequency Transmission rate Peak amplitude Bandwidth Frequency How is phase defined? A wave position relative to a reference position The total data capacity of network transmission A stage of the pattern of sending and receiving signals The amount of time a signal needs to finish one cycle A wave position relative to a reference position WGU D413 WGU D413 What is the absolute value of a signal's greatest magnitude in proportion to the energy that it is able to carry? Peak amplitude Period Spread Delta Peak amplitude What is one advantage of twisted-pair cables over fiber-optic cables? They require less skill and experience to install. They transmit signals over longer distances. They are less susceptible to electromagnetic interference. They have higher data transmission rates. They require less skill and experience to install. What is one characteristic of coaxial cables? They use a dielectric insulator to reduce electromagnetic field interference. They can transmit signals to a maximum of 100 MHz. They transmit only analog signals. They make use of light in signal transmission from one point to another. They use a dielectric insulator to reduce electromagnetic field interference. What is a characteristic of fiber-optic cables? They are composed of a core, cladding, a buffer, and a jacket. They have large diameters and tend to be heavy. They have four nodes in most cases. They only carry data over distances of 2-100 meters. They are composed of a core, cladding, a buffer, and a jacket. What is one advantage of fiber-optic cables? Fiber-optic cables can be used in safety-critical places. Fiber-optic cables can be installed cheaply and quickly. Fiber-optic cables can be tensioned without resulting in damage. Fiber-optic cables can be used over mobile communication links. Fiber-optic cables can be used in safety-critical places. What is one drawback of fiber-optic cable? It contains fragile components. It has high attenuation. WGU D413 WGU D413 It cannot be used in dangerous places. It performs poorly over long distances. It contains fragile components. What is one type of waveform used to transmit electromagnetic signals in wireless media? Radio waves Ultraviolet waves Thermal waves Gamma waves Radio waves What is the wireless service that enables people to have access to mobile internet? Cellular digital packet data (CDPD) Bluetooth Ethernet Wireless Application Protocol (WAP) Cellular digital packet data (CDPD) Which waves have higher frequencies than infrared transmission frequencies? Visible light waves Microwaves Radio waves Electromagnetic waves Visible light waves Which type of waves are used in Bluetooth transmission? Low-power radio waves High-power radio waves Low-power ultraviolet waves High-power ultraviolet waves Low-power radio waves What is a source of industrial noise? Electric motors Lightning Crosstalk Electron movement Electric motors WGU D413 WGU D413 Which cable realizes noise protection with the use of foil shielding? A cable transmitting signals between 15 and 20 kHz A cable transmitting signals between 10 and 15 kHz A cable transmitting signals between 5 and 10 kHz A cable transmitting signals between 0 and 5 kHz A cable transmitting signals between 15 and 20 kHz What is one advantage of the cyclic redundancy check (CRC)? It detects a large proportion of possible errors. It evaluates data based on 8-bit encoding. It uses a small number of parity bits. It is useful as an authentication mechanism. It detects a large proportion of possible errors. How are stutters counteracted to improve the quality of Voice over Internet Protocol (VoIP)? By installing jitter buffers By using analog signal transmission By installing VPN software By using a higher signal frequency By installing jitter buffers When using a campus network, a college student consistently notices slow-moving connectivity in the afternoon but not in the morning. What causes this problem? There is greater network congestion in the afternoon. Power use on the campus is greater in the afternoon. Network security measures are bolstered in the afternoon. IP addresses are reassigned each day in the afternoon. There is greater network congestion in the afternoon. Which wireless security feature hides the contents of network packets to ensure data can be transmitted over a wireless network safely? Intrusion detection system Application gateway Authentication Encryption key Encryption key WGU D413 WGU D413 Which multiplexing technique transmits each signal from one input source via a single time slot through the creation of different slots? Synchronous time-division multiplexing Asynchronous time-division multiplexing Integrated Services Digital Network (ISDN) multiplexing Transmission System 1 multiplexing Synchronous time-division multiplexing Which category of multiplexing randomly allocates time slots to different data signals depending on the rate at which they are being generated from the source? Asynchronous time-division multiplexing Synchronous time-division multiplexing Dense wavelength-division multiplexing Code-division multiplexing Asynchronous time-division multiplexing Which type of modem has been branded as a broadband device? Cable modem 56k modem CSU/DSU modem Satellite modem Cable modem Which type of modem has the slowest transmission rate? 56k modem Cable modem DSL modem ISDN modem 56k modem Which networking component is used to provide a device with a wireless connection point to a network? Router Server Switch Client Router Which network component facilitates the connection of a network device to other network devices and to the internet? WGU D413 WGU D413 WGU D413 Router Switch Host Bridge Router A network administrator wants to extend the range of wireless connectivity within the network. Which device is used for this purpose? Repeater Switch Hub Bridge Repeater A network engineer needs to connect two network devices that are 150 meters apart using Cat 5e cable. Which network component can be used to facilitate improved signal transmission in this case? Repeater Switch Modem Router Repeater A network administrator is asked to provide a single private /24 subnet for a new network segment from the company address management tool. Which classless inter-domain routing (CIDR) notation will be used to represent a private /24 subnet? 10.0.0.0 255.255.255.0 192.168.1.0 255.255.255.255 8.10.120.0 255.255.255.0 10.0.0.0 255.255.255.128 10.0.0.0 255.255.255.0 Two computers need to be directly connected within a network. WGU D413 WGU D413 Which Ethernet cable should be used to connect the computers? Straight-through Coaxial Fiber-optic Category 3 Straight-through A student is researching how personal devices connect to other devices using Bluetooth technology. Which IEEE standard working group can the student reference to learn more about Bluetooth connections? 802.15 802.35 802.18 802.24 802.15 Which IEEE 802.11 wireless standard has the highest data rate? 802.11a 802.11b 802.11g 802.11n 802.11n Which networking feature prioritizes time-sensitive packets traveling across the network? Media access control (MAC) Point-to-Point Tunneling Protocol(PPTP) Subnet mask Quality of service Quality of service What is the purpose of using a RADIUS server in conjunction with a wireless network? To extend the circular range of wireless access points To enable automatic configuration of wireless access points when they are connected to a network To provide an authentication mechanism for users connecting to a network To account for the clients connecting to the network WGU D413 To provide an authentication mechanism for users connecting to a network What is the purpose of documenting network policies and procedures? To keep important passwords stored in a safe location in case they are forgotten To keep a record of how the network has been configured To provide necessary information for security auditors To provide clear rules regarding how the network should or should not be used To provide clear rules regarding how the network should or should not be used An error-detection algorithm exists that identifies corruption in transmitted data; however, it produces additional data that are transmitted along the network. Which error detection method has this drawback? Parity check Encapsulation Data segmentation Cyclic redundancy check Cyclic redundancy check What should an engineer plan to do to prevent a broadcast storm while designing a network for a growing manufacturer? Segment the network to reduce collisions. Limit the number of wireless access points that are installed on the ceilings. Use a token ring network. Use a firewall to block this vulnerability. Segment the network to reduce collisions. What is the importance of allowing a Dynamic Host Configuration Protocol (DHCP) lease to expire? To keep the domain name system database updated with the current name and address mapping. To avoid vulnerability by hijacking an Internet Protocol (IP) address To avoid using stale IP addresses To allow IP addresses to become available for new clients within a specified address pool To allow IP addresses to become available for new clients within a specified address pool A hospital is concerned about the vulnerability and slow speed of its network. The network administrator has already identified that many unknown devices are connected to its wireless network. WGU D413 WGU D413 What should the network administrator do to reduce these issues? Create an acceptable use policy for the network Install an intrusion prevention system Create a guest wireless network Remove wireless access points from patient areas Create a guest wireless network A network technician has been given a requirement to expand the copper network in their company's leased premises, which has lately added three new offices. In the currently leased area, the distance between the offices and the network's closest node is roughly 101 m. When testing a test connection run between the two areas, the technician sees a significant level of attenuation. Which device will enable the technician to boost the poor signal and connect the entire rental office? Repeater Access point Dumb hub Splitter Repeater Which assessment is the first part of the design process? Hardware Directory Needs Facilities Needs Which electrical system is required for network equipment according to industry standards? Isolated Integrated Filtered Buffered Isolated A technician needs to monitor a newly deployed Lightweight Directory Access Protocol (LDAP) server to get a set of baseline information for it. WGU D413 WGU D413 Which time of the day is most optimal for the technician to start these measurements? Noon Midnight Morning Evening Morning What should be a mandatory component of organizational training for new network users? Training that educates them on security and uses based on the company policy and procedure Training only on password creation to ensure the end user is as secure as possible Training that gives industry-standard information about best practices on network design and usage Training that complies with international standards (ISO) Training that educates them on security and uses based on the company policy and procedure A network engineer has been tasked with adding additional network capacity to a regional remote access hub. They are given the following diagram as part of the documentation to use for the update. Which action should the engineer take before ordering any new equipment or service? They should take a baseline data center capacity measurement of the directory services, dynamic host configuration protocol (DHCP), and domain name system (DNS) servers. They should collect and analyze all logs from the intranet-facing systems to determine any known errors and help plan device updates and bug fixes. They should take a baseline network capacity measurement of the internet service provider (ISP), hardware virtual private network (VPN), and software VPN. They should collect all special requirements for the update from the stakeholders so that the design engineer can make sure to keep their needs in mind They should take a baseline network capacity measurement of the internet service provider (ISP), hardware virtual private network (VPN), and software VPN. The dynamic multipoint virtual private network (DMVPN) topology shown below has a central connection for the regional headquarters. What is the purpose of the central connection point to the sales offices outside the virtual private network (VPN) connectivity? WGU D413 WGU D413 WGU D413 If one sales office lost connectivity to the regional headquarters, the other sales office would continue to operate without being affected. The sales offices can send information to each other more efficiently than if they were directly connected to one another. The regional headquarters can monitor the sales offices for suspicious activities and act against any malicious actors on the remote network. The regional headquarters and hub located there provide telemetry data to each router in each sales office that gives appropriate latency and quality of service (QoS) information. If one sales office lost connectivity to the regional headquarters, the other sales office would continue to operate without being affected. A network administrator needs to provide limited access to guests and contractors as well as prevent unauthorized users' access. Which modification to the following network diagram will support both access scenarios? A firewall should be added between the guest wireless access point (WAP) and the corporate network. A network management appliance should be used to control access to the network. A hub should be used between the guest wireless access point (WAP) and the corporate network. A Power over Ethernet (PoE) workgroup switch should be added to protect the corporate network. A firewall should be added between the guest wireless access point (WAP) and the corporate network. How many collision domains are represented in the following network diagram? 3 4 9 12 9 The given network diagram shows a multilayered and segmented office network. Which information was been omitted that would allow for proper connectivity of the different network segments with each other? The network needs an intrusion detection system (IDS) and security appliance solution. WGU D413 The network needs an Automatic Private IP Addressing (APIPA) solution. The network needs an interior gateway protocol (IGP) routing solution. The network needs an exterior gateway protocol (EGP) routing solution. The network needs an interior gateway protocol (IGP) routing solution. A network is configured according to the network diagram. System D is experiencing packet data loss and connectivity issues. What is causing the loss of data packets and connectivity issues? The maximum cable length is exceeded. There are too many systems connected to the switch. The category of Ethernet cable is too low. The adjacent system is more than twice as close to the switch. The maximum cable length is exceeded. The network diagram with the following instantaneous bandwidth and cabling is used to represent the layout of a network. What is the flaw in the network diagram? The bandwidth between systems C and D is unattainable. The bandwidth between systems B and D is unattainable. There is no connection between systems A and D. There is no connection between systems B and C. The bandwidth between systems C and D is unattainable. A network is arranged using the cables shown in the network diagram. The necessary transmission rates for cabled connections are labeled. How can the cabling problem within the network diagram be fixed? Change the internet-router cable to Cat 7a. Switch the Cat 6a cable and the Cat 5e cable. Add a Cat 7a cable between systems A and B. Switch the Cat 5e cable and the Cat 6 cable. Change the internet-router cable to Cat 7a. A company is developing a television network to broadcast local news content using analog signals. Which multiplexing technique should be used? Frequency-division multiplexing WGU D413 WGU D413 Code-division multiplexing Synchronous time-division multiplexing Integrated Services Digital Network (ISDN) multiplexing Frequency-division multiplexing A network administrator is setting up a network that will utilize lasers to send analog data through fiber-optic cable. Which multiplexing technique should the administrator use? Wavelength-division multiplexing Frequency-division multiplexing Synchronous time-division multiplexing Asynchronous time-division multiplexing Wavelength-division multiplexing Which type of multiplexing is used to send and receive digital signals between connected devices? Time-division multiplexing Frequency-division multiplexing Wavelength-division multiplexing Amplitude-division multiplexing Time-division multiplexing WGU D413