SQL & PL/SQL

SELECT e.last_name, j.job_title, d.department_name
FROM hr.employees e, hr.departments d, hr.jobs j
WHERE e.department_id = d.department_id
AND e.job_id = j.job_id
AND e.last_name LIKE 'A%' ;

Execution Plan
----------------------------------------------------------
Plan hash value: 975837011

---------------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
---------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 3 | 189 | 7 (15)| 00:00:01 |
|* 1 | HASH JOIN | | 3 | 189 | 7 (15)| 00:00:01 |
|* 2 | HASH JOIN | | 3 | 141 | 5 (20)| 00:00:01 |
| 3 | TABLE ACCESS BY INDEX ROWID| EMPLOYEES | 3 | 60 | 2 (0)| 00:00:01 |
|* 4 | INDEX RANGE SCAN | EMP_NAME_IX | 3 | | 1 (0)| 00:00:01 |
| 5 | TABLE ACCESS FULL | JOBS | 19 | 513 | 2 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL | DEPARTMENTS | 27 | 432 | 2 (0)| 00:00:01 |
---------------------------------------------------------------------------------------------

Predicate Information (identified by operation id):
---------------------------------------------------
  1 - access("E"."DEPARTMENT_ID"="D"."DEPARTMENT_ID")
  2 - access("E"."JOB_ID"="J"."JOB_ID")
  4 - access("E"."LAST_NAME" LIKE 'A%')
     filter("E"."LAST_NAME" LIKE 'A%')

I don't understand that how come E.LAST_NAME column is evaluated both access and filter? Can somebody please explain this? Or recommend me a article or document that explain what excatly predicate explains in explain plan?

Thanks in advance.