There are a certain number of housing units available for international students that apply before the deadline. Whether or not you are guaranteed housing depends on how many applications there are for that semester. Some campuses have more available housing than others. Also keep in mind when applying that some types of housing units will fill up quicker than others, and it can be a good idea to apply for more than one if possible.
Keep in mind that SSN and USN are different units, so if you have any questions about housing, please contact SSN directly.
The SSN contracts lasts at least one - 1 - full semester:
August 1 - December 31
January 1 - June 30
Contracts cannot be terminated before these dates (Dec 31 / June 30)