ICMC EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026

ICMC EXAM QUESTIONS ANSWERED CORRECTLY LATEST UPDATE 2026 What is C4I? - Answers We use COMPUTERS, connected to live COMMUNICATION circuits to either send or receive COMMAND and CONTROL orders and operational INTELLIGENCE. What is IT21? - Answers An information transfer strategy that currently leverages off of acquisition programs to provide an integrated, coordinated end-to-end warfighting capability. What are the weaknesses of "LEGACY" design? aka "STOVEPIPE". - Answers -Specialized circuit -Specialized purpose -Can't be shared; very inflexible -Very bandwidth inefficient. 2400bps -Not using "open" standards. cannot use commercial products on the Military Circuit. Type of "LEGACY" design? - Answers CUDIXS What are the IT21 Objectives? - Answers -Information superiority -Network Centric Warfare -Quality of Life What is DISA? - Answers Defense Information System Agency. Provide C4I (NIPR, SIPR, JWICS, DSN, DRSN, and JCA) to the war fighter, world wide. What is FLTCYBERCOM/C10F? - Answers Central operational authority for networks, cryptology/SIGINT, IO, cyber, EW, and space in support of forces afloat and ashore. What is SPAWAR? - Answers Space and Naval Warfare Systems Command. It provides the systems/equipment to meet the requirement. PMW 130 = IA; PMW 150 = Command and Control; PMW 160 = Networks and Ent. Services; PMW 170 = Communications What is CID? - Answers Center for Information Dominance. -Training for Information Dominance positions. i.e. IT's, CT's, IP officers...... Radio Frequency in general. - Answers The lower the frequency, the longer the wavelength, and the Bigger the antenna must be to radiate the signal. The higher the frequency, the shorter the wavelength, the higher the B.width, and the more info that can be encoded on the wave. HF - Answers High Frequency 3 - 30MHz Long range Tactical Comms. VHF - Answers Very High Frequency 30 - 300MHz -LOS/ Bridge to Bridge -Marines SINCGARS (30 - 88MHz) -International Air Distress (IAD) and Military Air Distress (MAD) UHF - Answers Ultra High Frequency 300 - 3000MHz (3GHz) -UTILITY -LOS and SATCOM voice/data/video -Low = 75bps - Max = 2400bps SHF - Answers Super High Frequency 3 - 30GHz -CAPACITY -Satcom = DSCS, CWSP internet EHF - Answers Extremely High Frequency 30 - 300GHz - SURVIVABILITY - Highly Sensitive Comms / Tomahawk Strike Missions - MDU, TIP / LDR, MDR What is Amplitude? - Answers Magnitude or Peak value of a wave. What is Wavelength? - Answers Physical length of wave in meters. What is Frequency? - Answers the number of times the cycle repeats itself in one second. Measured in Cycles per Second, and expressed in hertz. (Hz). What are the 3 types of Antenna Directivity? - Answers -Unidirectional = one direction only -Bi-directional = two directions, 180 degrees apart. -Omnidirectional = all directions, 360 degrees. What is Polarization of a wave? - Answers How the wave propagates in relation to the Earth. What are the 4 types of Polarization? - Answers -Vertical -Horizontal -Right Hand Circular -Left Hand Circular What are the types of Communication Links? - Answers -SIMPLEX = one direction only -HALF DUPLEX = two directions, one at a time -FULL DUPLEX = two directions simultaneously. (Like a telephone) What are the 3 most common types of Multiple Access? - Answers -Frequency Division Multiple Access (FDMA) -Time Division Multiple Access (TDMA) -Spread Spectrum Multiple Access (SSMA) What are the 3 forms of Digital Modulation? - Answers -Amplitude Shift Keying (ASK) -Frequency Shift Keying (FSK) -Phase Shift Keying (PSK) most common and newest What are the Advantages and Disadvantages of UHF? - Answers Advantages: Workhorse of Naval Satcom; Very Widespread; Can use small, lightweight equipment Disadvantages: Low Data Rates; Very Crowded; Susceptible to Jamming What are the Advantages and Disadvantages of SHF? - Answers Advantages: High Data Rate; Joint interoperability Disadvantages: DSCS crowded; CWSP costly; Small antenna makes ships "disadvantaged users" What are the Advantages and Disadvantages of EHF? - Answers Advantages: LDR=Anti-jam, Anti-Scint, Low Probability of Detection/Intercept, Survive Nuclear attack. MDR = Beter Data rates Disadvantages: LDR = Slow, Not as widespread as UHF; MDR = not as survivable to Nuclear attacks; Susceptable to rain What are the 3 Satellite Orbits? - Answers -Geosynchronous = 22,300 miles; above equator; rotates with earth's rotation -Low Earth Orbit = 100-1000 miles; Iridium Sat -Highly Eliptical Orbit = Long linger time in northern latitudes; typically for Subs What is a Modem? - Answers device that performs both the process of modulation (TX) and demodulation (RCV) By which converting signals from digital to analog(And vice versa) in order to be transmitted and rcvd. What is Multiplexing? - Answers Combining multiple signals for transmission over a single transmission path. What is TPI? - Answers Two Person Integrity = Security measure to prevent single-person access to COMSEC material. Practices Dangerous to Security - Answers Reportable = Early use of Keymat; Early Destruction; Not completing Inventory Non-Reportable = Missing Signatures; Transfer Keymat with Status markings still intact; issue of crypto outside of 30 days to LE; Late Destruction of Keymat and FD. Notify CO What is Emissions Security? - Answers Protection resulting from all measures taken to deny enemy any information of value which might be derived from intercept and analysis of compromising RF Transmissions from crypto-equipment, AIS, and telecommunications systems. [NIS]