Air Force Network Integration Apprentice Exam 3c251 Vol 4

During World War II, there was a need for more reliable high-capacity communications. This was due to the increasing complexity and scale of military operations, which required efficient and secure communication systems. Very high frequency (VHF) and ultrahigh frequency (UHF) radio systems were developed to meet this need. These systems offered improved signal quality, greater bandwidth, and reduced interference, allowing for more reliable and efficient communication between military units.

Radio waves can be classified into two primary types based on their propagation characteristics. Ground waves are radio waves that travel close to the Earth's surface and follow the curvature of the Earth. These waves are used for long-distance communication as they can travel over large distances by bending around obstacles. Sky waves, on the other hand, are radio waves that are reflected off the ionosphere, a layer of charged particles in the Earth's upper atmosphere. These waves can be used for long-distance communication as they can be reflected back to the Earth's surface. Therefore, the correct answer is ground and sky.

The defense information systems agency (DISA) is responsible for the design, acquisition, and single systems management of the defense switched network. DISA is an agency within the Department of Defense that provides information technology and communications support to the military. They are responsible for ensuring the secure and efficient operation of the defense network infrastructure, including the defense switched network.

Oxygen and water absorption causes propagation loss in satellite communications due to their interaction with electromagnetic waves. As the frequency of the waves increases, the absorption by oxygen and water molecules also increases. At frequencies above 10 gigahertz (GHz), the absorption becomes very serious, resulting in significant signal degradation and loss.

Time division multiple access (TDMA) is a communication technique that allows multiple users to share the same frequency channel by dividing it into different time slots. One of the control problems with TDMA is network timing, which refers to the synchronization of the different devices in the network to ensure accurate transmission and reception of data. Another control problem is synchronization with power frequency, which involves aligning the timing of the TDMA system with the power grid frequency to prevent interference and maintain reliable communication. Therefore, synchronization is a crucial aspect in TDMA systems to ensure efficient and accurate data transmission.

The correct answer is secure telephone unit- III (STU-III). STU-III is an encryption device that enables end-to-end encryption for any user of the defense switched network. It provides secure communication by encrypting voice and data transmissions, ensuring that only authorized users can access the information. STU-III is widely used in military and government organizations to protect sensitive and classified information from unauthorized access or interception.

The critical frequency is the highest frequency that can be transmitted vertically and return to Earth under specific ionospheric conditions. It represents the point at which the ionosphere becomes too dense to allow the radio waves to pass through and be reflected back to Earth. This frequency is important for determining the maximum usable frequency for communication purposes.

A typical link involves an active satellite and two earth terminals. This is because the satellite acts as a relay station between the two earth terminals, allowing communication between them. One earth terminal sends the signal to the satellite, which then transmits it to the other earth terminal. Having two earth terminals ensures that there is a two-way communication link, allowing for data transmission in both directions.

The Red switch program provides a Red telephone to the Command and Control (C2) only. This means that only subscribers involved in command and control activities can access and use the Red telephone provided by the Red switch program. It excludes subscribers who are involved in operational support, logistics, or both.

A FORTEZZA card is used to provide the cryptographic engine for the secure terminal equipment (STE) terminal. The FORTEZZA card is a type of smart card that contains encryption algorithms and keys necessary for secure communication. It is specifically designed to meet the requirements of the National Security Agency (NSA) for secure communications.

A major disadvantage of a geostationary satellite is the two-way propagation delay of about 0.6 seconds. This delay occurs due to the large distance that signals have to travel between the satellite and the ground station. It can cause noticeable delays in real-time communication, such as telephone conversations or video calls, making them less efficient and sometimes even impractical.

A satellite transponder is a device that receives signals from earth terminals, amplifies them, and then retransmits them back to earth. It acts as a communication relay between the earth terminals and the satellite. This allows for the signals to be transmitted over long distances and ensures that they maintain their strength and quality during the transmission process.

A flash override call in a switched network (DSN) precedence cannot be preempted. This means that when a flash override call is made, it will take precedence over any other type of call in the network, regardless of their priority or importance. This ensures that critical and urgent messages are immediately relayed without any delay or interruption.

The shift supervisory is responsible for making the first entry and signing the DD form 1753. This indicates that they are in charge of documenting and recording any relevant information related to the form. As the shift supervisor, they have the authority and accountability to ensure that the necessary documentation is completed accurately and in a timely manner.

Free space attenuation refers to the reduction in amplitude of a radio signal as it travels through a propagation medium without any obstructions, scattering, or reflecting effects. This means that the signal weakens as it moves away from the source in an unobstructed environment. The Faraday effect is the rotation of the plane of polarization of a light wave as it passes through a magnetic field, while the Doppler effect is the change in frequency of a wave due to the relative motion between the source and the observer. Therefore, neither of these options accurately describes the given scenario.

The Regional Network Operations and Security Control Center (RNOSC) provides theater-wide administration and network management in the Defense Switched Network (DSN). The RNOSC is responsible for overseeing and maintaining the DSN infrastructure within a specific region, ensuring its availability and security. This includes managing network resources, troubleshooting issues, and implementing security measures to protect the network from cyber threats. The GNOSC, on the other hand, is responsible for global network operations and security control, overseeing multiple RNOSCs and providing higher-level coordination and support. The SRCF and Local Control Center are not responsible for theater-wide administration and network management in the DSN.

The major type(s) of terminal used in the Defense Red Switched Network are the Secure Telephone Unit III (STU-III) and Secure Terminal Equipment (STE).

Site Commanders do not have the authority to designate special interest items.

The Doppler effect refers to the change in frequency of a wave as a result of the relative motion between the source of the wave and the observer. In the context of satellite communications, the satellite's motion in space relative to the ground stations causes the Doppler effect. As the satellite moves towards or away from the ground stations, the frequency of the transmitted signal appears to shift higher or lower, respectively, to the observer on the ground. This phenomenon needs to be taken into account in order to accurately receive and interpret satellite signals.

The major components of the theater deployable communications (TDC) system that provide mobile units with flexible, lightweight, secure, modular, and integrated deployable communications are the Lightweight Multiband Satellite Terminal (LMST) and the Integrated Communications Access Package (ICAP). These components are essential for enabling mobile units to have efficient and reliable communication capabilities in theater deployments.

The long-haul transmission component of theater deployable communications (TDC) is the Lightweight multiband satellite terminal (LMST). This terminal is designed to provide reliable and secure satellite communications over long distances. It is lightweight and can be easily transported and set up in theater environments. The LMST supports multiple frequency bands, allowing it to operate in various satellite networks and adapt to different mission requirements. It is an essential component for establishing and maintaining long-range communication capabilities in theater deployments.

The multi-channel standard tactical entry point provides communications capability to connect to the Defense Information Systems Network (DISN). This means that deploying forces can utilize the DISN for their communication needs, allowing them to securely transmit data, voice, and video information. This connectivity to the DISN ensures that the forces can effectively communicate and coordinate with other military units and command centers, enhancing their situational awareness and operational capabilities.

Diffraction is the correct answer because it refers to the bending or spreading out of a wave as it encounters an obstacle or passes through a narrow opening. In the case of a radio wave grazing the top of an obstruction, such as a mountain peak, the wave will experience diffraction, causing it to bend downward. This phenomenon occurs because the radio wave interacts with the edges of the obstruction and spreads out, resulting in a change in its direction.

During periods of maximum sunspot activity, the F layer of the ionosphere becomes more dense and moves to a higher altitude. This is because the increased solar radiation during sunspot activity causes more ionization in the F layer, leading to an increase in the number of free electrons. These free electrons then recombine with ions in the F layer, resulting in a denser layer. Additionally, the increased ionization also causes the F layer to move to higher altitudes due to the increased electron density and interaction with the Earth's magnetic field.

High-priority users should not be terminated on a remote switching unit (RSU) because the RSU can become isolated from the parent switch. This means that if the RSU loses connectivity with the parent switch, the high-priority users will not have access to the necessary resources and services provided by the parent switch. Therefore, it is important to ensure that high-priority users are connected to a reliable and stable network to maintain uninterrupted communication and access to essential services.

Time Division Multiple Access (TDMA) is a type of multiple-access service used in satellite communications that provides each earth terminal exclusive use of the satellite transponder for a specified time interval. In TDMA, the available bandwidth is divided into time slots, and each earth terminal is allocated a specific time slot to transmit its data. This allows multiple terminals to share the same frequency channel by taking turns transmitting their data during their allocated time slots. By dividing the time, TDMA ensures that each earth terminal has exclusive access to the satellite transponder during its assigned time interval, ensuring efficient and reliable communication.

Microwave and laser systems are used to interconnect integrated communications access package access nodes on a deployed base within the same theater area. This means that in addition to fiber-optic and copper cables, microwave and laser technology is utilized for communication purposes. These systems provide a wireless connection that allows for the transmission of data and information between access nodes, ensuring efficient and reliable communication within the deployed base.

Maintaining optimum performance of a satellite's transponder is achieved through satellite control. This involves monitoring and controlling various aspects of the satellite's operations, such as power levels, frequency management, and signal quality. Satellite control ensures that the transponder operates efficiently and effectively, allowing for reliable communication and data transmission. Station keeping, satellite ground track, and communications control are important factors in satellite operations, but they are not specifically related to the performance of the transponder.

Spread spectrum multiple access (SSMA) is a satellite access system that allows several users to occupy the same frequency spectrum in the transponder simultaneously. SSMA uses a technique called spread spectrum, which spreads the signal across a wide frequency band. This allows multiple users to share the same frequency band without interfering with each other. SSMA is known for its ability to provide secure and reliable communication, as well as its resistance to jamming and interference.

The correct answer is "intermediate." In a defense switched network (DSN), calls pertaining to situations that gravely affect the security of national allied forces are given an intermediate precedence. This means that these calls are of significant importance but not as urgent as flash or flash override calls. Intermediate precedence ensures that these calls are prioritized and given attention, but they may not be as time-sensitive as other types of calls.

The basic access package (BAM) is the integrated communications access package module that contains circuit switches that implement private branch exchange (PBX). This means that BAM allows for the routing of both voice and data communications within an organization, providing telephone services and internal communication capabilities. It is a comprehensive solution that includes the necessary hardware and software components to support PBX functionality. The other options, such as the secure voice module, voice configuration kit, and digital subscriber voice terminal (DSVT), do not specifically mention circuit switches or PBX implementation.

After a circuit is deactivated, the circuit data record (DD form 1441) is retained for a period of six months. This is done to ensure that the necessary information related to the circuit is available for any future reference or auditing purposes. Retaining the record for six months allows sufficient time to review and analyze the data before it can be securely disposed of.

Survivability in the defense switched network is provided by having end offices that are multiple-homed. This means that each end office is connected to multiple network paths or links, ensuring redundancy and fault tolerance. If one link or path fails, the end office can still maintain connectivity and communication through the alternate paths. This multiple-homing feature increases the network's resilience and ability to withstand disruptions or attacks, thereby enhancing survivability.

The correct answer is "A message is sent to the originating peripheral processor to remove ringing tone." When a called DSN subscriber answers the call, the switch's central control (CC) module sends a message to the originating peripheral processor to remove the ringing tone. This indicates that the call has been successfully answered and the ringing tone needs to be stopped.

The NIPRNET is partially protected by encryption devices. This means that while some measures are in place to secure the network, it is not fully encrypted. Encryption is a method of encoding data to make it unreadable to unauthorized users, and it provides an additional layer of security. However, since the NIPRNET is only partially protected by encryption devices, there may still be some vulnerabilities or risks associated with the network.

The Network Encryption System (NES) is an internet protocol (IP) encryption device that can be directly connected to Red local area networks (LAN). It is designed to provide secure communication and protect sensitive information transmitted over the network. The other options, KG-84, KG-194, and KIV-7, are encryption devices, but they may not be specifically designed for direct connection to LANs or for IP encryption.

A medium size integrated communications access package (ICAP) node can support a maximum of 150 to 200 personnel. This means that the node is designed to accommodate a workforce within this range. It is important to have this limit in order to ensure efficient and effective communication and access capabilities within the node. Having too few personnel may result in a lack of resources and manpower, while having too many personnel may lead to overcrowding and decreased productivity. Therefore, the optimal range for the maximum number of personnel in a medium size ICAP node is between 150 and 200.

The correct answer is "Test, measurement, and diagnostic equipment (TMDE) listings." This type of document identifies test equipment that has not been updated and has exceeded its calibration date, is currently in maintenance, and is due calibration within the next two months. TMDE listings provide a comprehensive record of all the test, measurement, and diagnostic equipment in an organization, including their calibration status and maintenance schedules. By referring to these listings, organizations can ensure that their equipment is properly calibrated and maintained to ensure accurate and reliable testing and measurements.

The maximum asynchronous data rate for the Defense Red Switch Network (DRSN) is 19.2 Kbps.

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To move a circuit to another channel, you must fill out and put DD Form 1697 in the circuit history folder along with the TSO.

If the circuit does not meet all required parameters but is still accepted for service by the TSO issuing authority, a report called "Exception" must be sent. This report is used to document and highlight any deviations or exceptions from the required parameters. It serves as a record of the circuit's non-compliance and allows for further investigation or action to be taken if necessary.

The correct answer is "space." In satellite communications, the space subsystem refers to the satellite itself, which includes the satellite antenna array and the transportation of signals to and from Earth. This subsystem is responsible for transmitting and receiving signals between the satellite and ground stations, enabling communication over long distances.

The circuit data record primarily serves to assist the systems control facility in troubleshooting and circuit restoration. This means that it provides valuable information and documentation that helps the facility identify and fix any issues or problems with the circuits. It acts as a reference guide for the facility staff to understand the circuit layout, connections, and other relevant details, enabling them to effectively troubleshoot and restore the circuit's functionality.

The correct answer is Microwave. The Microwave module in the Integrated Communications Access Package (ICAP) provides the radio frequency (RF) line-of-sight (LOS) link function for internodal connectivity. Microwave technology uses high-frequency radio waves to transmit data and is commonly used for wireless communication over long distances. It allows for reliable and high-speed communication between nodes in a network.

The lightweight multiband satellite terminal (LMST) capability of having access to both C and Ku bands reduces the limitations of the Defense Satellite Communications System (DSCS). By having access to multiple bands, the LMST can utilize different frequencies and channels, increasing its flexibility and capacity for communication. This allows for improved signal quality, increased bandwidth, and enhanced data transmission capabilities, ultimately overcoming the limitations of relying on a single band for satellite communications.

To connect their own telephones and computer workstations to the theater deployable communications (TDC) backbone network, customers must adhere to various open system standards and interfaces such as Ethernet. This means that they need to ensure compatibility with the established protocols and technologies used in the network, specifically Ethernet, which is a widely adopted standard for local area networks (LANs). By adhering to these standards, customers can ensure seamless integration and communication with the TDC backbone network.

The design architecture of theater deployable communications (TDC) is a Metropolitan area network (MAN) and hub spoke. This means that the TDC system is set up to connect multiple local area networks (LANs) within a specific geographical area, with a central hub acting as the main point of communication. The hub spoke design allows for efficient and centralized communication between different LANs, making it suitable for theater deployments where multiple units or locations need to be connected.

The exception report must be maintained in the circuit history folder at an intermediate facility until the condition causing the report to be rendered is cleared. This means that the report should be kept until the issue or problem that led to the report being generated is resolved or fixed. Once the condition is cleared, the report may no longer be necessary and can be removed from the circuit history folder.

The correct answer is 310-70-1 and 310-55-1. These DISAC circulars contain the necessary information to assign a temporary command communications service designator (CCSD).