LESSON 2
PRACTICE EXERCISE
The following items will test your grasp of the material covered in this lesson. There is only one correct
answer for each item. When you complete the exercise, check your answers with the key that follows.
If you answer any item incorrect, study again that part of the lesson which contains the portion involved.
1. NATO members have reached a STANAG to use a unique three-digit identification number. The
first three digits of a 13-digit telephone number represents which of the following?
A.
National identification number
B.
Area code
C.
Subscriber number
D.
Primary zone/switch location
2.
In assigning tactical area codes, a planner must not duplicate existing DSN area codes.
A.
True
B.
False
3.
Which is the NI code for the tactical US forces?
A.
312
B.
317
C.
914
D.
315
4.
What is a mixed subnetwork?
A.
The MYX area where the NNX and PRSL subnetworks coexist
B.
The MYX area is divided into 640 switching center (NNX) codes
C.
The MYX area can be divided into 23 primary zones or areas (PR)
D.
A and B
5.
What do the first three digits in the commercial numbering plan represent?
A.
Switch code
B.
Area code
C.
Subscriber number
D.
Dial tone
SS 0029
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