While a protocol as a whole, may be comprised of more than one header type that it uses for communication purposes to exchange information such as state and transmit application specific data. This is the reason why sometimes a protocol is described as a protocol suite.
Since January 1, 2006, U.S. employers have been allowed to amend their 401(k) plan document to allow employees to elect Roth IRA type tax treatment for a portion or all of their retirement plan contributions. The same change in law allowed Roth IRA type contributions to 403(b) retirement plans. Employees can roll their Roth 401(k) contributions over to a Roth IRA account upon termination of employment. 2  It is the employer's decision whether to provide access to the Roth 401(k) in addition to the traditional 401(k).
Both 401k and 403b plans have limits on how much an employee can contribute to them (i.e. maximum 401k contribution limits). For 2011, the standard elective deferral limit is $16,500 for both plans.Further, both allow âcatch-upâ contributions for employees age 50 and older.oth 401k and 403b plans have limits on how much an employee can contribute to them (i.e. maximum 401k contribution limits). For 2011, the standard elective deferral limit is $16,500 for both plans.