JTIDS 2026 STUDY GUIDE QUESTIONS AND ANSWERS
GUARANTEE A+
✔✔What is the link margin value that must be achieved to force an enemy jammer at
equal distance to a receiving Link 16 terminal to use 128 times more power than the
transmitting terminal? - ✔✔21 dB
✔✔Which Link 16 jam resistance characteristic defines the required distance between a
jammer and a receiver to jam Link 16 communications using equal power? - ✔✔Range
ratio
✔✔How many of the 31 symbols that are transmitted for each JWORD must be
received in order to pass uncorrupted data to the host system? - ✔✔16
✔✔Which of the following IS NOT true of the use of the Link 16 information assurance
feature known as double pulse transmissions? - ✔✔Each pulse occurs on identical
frequencies
✔✔Dedicated Timeslot Reuse is a form of what JTIDS/MIDS access mode? - ✔✔*NOT*
Dedicated Timeslot Reuse
✔✔Which is not a method that can be used to deconflict Link 16 networks? - ✔✔*NOT*
Using unique TSEC crypto keys for the main net
✔✔Which of the following are true about JTIDS/MIDS transmissions? Select all that
apply. - ✔✔-Each transmission contains one or more fixed format messages or a free
text transmission
-A full transmission occurs in a single timeslot
-Hopping pattern has a hopping rate of 76,923 hops per second
✔✔What are the terminal design features that contribute to JTIDS/MIDS jam
resistance? Select all that apply. - ✔✔-Pseudorandom frequency-hopping pattern over
51 discrete center frequencies
-High hopping rate of 76,923 hops per second
-Error Detection and Correction (EDAC) coding
✔✔How many cryptographic keys can the JTIDS/MIDS Secure Data Unit (SDU) store? -
✔✔*NOT* 127
✔✔Which are NOT methods that can be used to deconflict Link 16 networks? -
✔✔Using different Initialization Data Load (IDL) files + Employing a network time offset
, ✔✔ Which of the following is a function provided by the Link 16 terminal's JREAP C
connection? - ✔✔J-Series messages using JREAP C protocol
✔✔How many frames are in an epoch in Link 16 communications? - ✔✔64
✔✔What are the two types of JTIDS/MIDS RF connectivity? - ✔✔Direct connectivity and
indirect connectivity
✔✔Link 16 line-of-sight connectivity is limited by what type of signal propagation? -
✔✔Direct wave propagation
✔✔Which JTIDS/MIDS access technique allows a common group of timeslots to be
used for the same function but on different operating selectable nets? - ✔✔Stacked
Nets
✔✔Which JTIDS/MIDS access technique is not operator selectable and allows different
groups of users to exchange information in different Network Participation Groups
(NPGs)? - ✔✔Multi-nets
✔✔Which of the following IS NOT determined by the Transmission Security (TSEC)
variable in Link 16? - ✔✔*NOT* Frequency hopping pattern
*NOT* Symbol interleaving start point
✔✔In which Link 16 security mode is a discrete Crypto Variable Logic Labels (CVLLs)
assigned to only the TSEC which is used for message encryption as well? - ✔✔*NOT*
Partition Variable Mode (PVM)
✔✔What numbers are used by a network designer as Crypto Variable Logic Labels
(CVLLs)? - ✔✔1 - 127
✔✔Which of the following is a purpose of the Network Description Document (NDD)
COMSEC Cross Reference Table? - ✔✔Assigns Crypto Variable Logic Labels (CVLLs)
to Secure Data Unit (SDU) locations for each platform
✔✔The JANUS Table can be used to determine the _______________ for a specific
calendar day. - ✔✔Current Crypto Period Designator (CCPD)
✔✔TRUE or FALSE: MIDS Step Down requires that fighters load no more than two
crypto keys for each network. - ✔✔True
✔✔Which OPTASK LINK set allows the JICO to provide whether a specific date is a 0
or 1 day? - ✔✔*NOT* JCRYPDAT
GUARANTEE A+
✔✔What is the link margin value that must be achieved to force an enemy jammer at
equal distance to a receiving Link 16 terminal to use 128 times more power than the
transmitting terminal? - ✔✔21 dB
✔✔Which Link 16 jam resistance characteristic defines the required distance between a
jammer and a receiver to jam Link 16 communications using equal power? - ✔✔Range
ratio
✔✔How many of the 31 symbols that are transmitted for each JWORD must be
received in order to pass uncorrupted data to the host system? - ✔✔16
✔✔Which of the following IS NOT true of the use of the Link 16 information assurance
feature known as double pulse transmissions? - ✔✔Each pulse occurs on identical
frequencies
✔✔Dedicated Timeslot Reuse is a form of what JTIDS/MIDS access mode? - ✔✔*NOT*
Dedicated Timeslot Reuse
✔✔Which is not a method that can be used to deconflict Link 16 networks? - ✔✔*NOT*
Using unique TSEC crypto keys for the main net
✔✔Which of the following are true about JTIDS/MIDS transmissions? Select all that
apply. - ✔✔-Each transmission contains one or more fixed format messages or a free
text transmission
-A full transmission occurs in a single timeslot
-Hopping pattern has a hopping rate of 76,923 hops per second
✔✔What are the terminal design features that contribute to JTIDS/MIDS jam
resistance? Select all that apply. - ✔✔-Pseudorandom frequency-hopping pattern over
51 discrete center frequencies
-High hopping rate of 76,923 hops per second
-Error Detection and Correction (EDAC) coding
✔✔How many cryptographic keys can the JTIDS/MIDS Secure Data Unit (SDU) store? -
✔✔*NOT* 127
✔✔Which are NOT methods that can be used to deconflict Link 16 networks? -
✔✔Using different Initialization Data Load (IDL) files + Employing a network time offset
, ✔✔ Which of the following is a function provided by the Link 16 terminal's JREAP C
connection? - ✔✔J-Series messages using JREAP C protocol
✔✔How many frames are in an epoch in Link 16 communications? - ✔✔64
✔✔What are the two types of JTIDS/MIDS RF connectivity? - ✔✔Direct connectivity and
indirect connectivity
✔✔Link 16 line-of-sight connectivity is limited by what type of signal propagation? -
✔✔Direct wave propagation
✔✔Which JTIDS/MIDS access technique allows a common group of timeslots to be
used for the same function but on different operating selectable nets? - ✔✔Stacked
Nets
✔✔Which JTIDS/MIDS access technique is not operator selectable and allows different
groups of users to exchange information in different Network Participation Groups
(NPGs)? - ✔✔Multi-nets
✔✔Which of the following IS NOT determined by the Transmission Security (TSEC)
variable in Link 16? - ✔✔*NOT* Frequency hopping pattern
*NOT* Symbol interleaving start point
✔✔In which Link 16 security mode is a discrete Crypto Variable Logic Labels (CVLLs)
assigned to only the TSEC which is used for message encryption as well? - ✔✔*NOT*
Partition Variable Mode (PVM)
✔✔What numbers are used by a network designer as Crypto Variable Logic Labels
(CVLLs)? - ✔✔1 - 127
✔✔Which of the following is a purpose of the Network Description Document (NDD)
COMSEC Cross Reference Table? - ✔✔Assigns Crypto Variable Logic Labels (CVLLs)
to Secure Data Unit (SDU) locations for each platform
✔✔The JANUS Table can be used to determine the _______________ for a specific
calendar day. - ✔✔Current Crypto Period Designator (CCPD)
✔✔TRUE or FALSE: MIDS Step Down requires that fighters load no more than two
crypto keys for each network. - ✔✔True
✔✔Which OPTASK LINK set allows the JICO to provide whether a specific date is a 0
or 1 day? - ✔✔*NOT* JCRYPDAT
