Define at least 4 major components of Test Plan.

The major components of the test plan are as follows:
Introduction : This section gives the introduction of the test plan document.

Scope & objective: This section will provide the details about scope and objective of the project or system.

Test plan id:
Test approach: This section of the test plan provide broad coverage of the issue to be addressed when testing the target software.

Test items: This is a listing of the entities to be tested and should include names,identifiers, revision number for each entity.
Role and responsibility: This section will define all the roles and responsibility of all the testers.

Define at least 4 major components in Test Strategy document.
The major components in test strategy document.

1.Test automation and tools:  This section will define which tools are going to be used in the test.

2.Industry standards to follow: This section will define what type of business standard are going to be followed while going through the testing phase.

3.Scope & objective: This section will provide the details about scope and objective of the
Project and the system.

4.Test Environment: This section will describe about the environment in which all the testing technique is going to be applied.


3. Derive the differences between Test Plan Vs Test Strategy
TEST PLAN
TEST STRATEGY
A test plan for software can be defined as a document that define the scope and objective,approach etc
Test strategy is  a set of guidline that give details about the test design.
Test plan include -test plan id,features to be tested testing task
Test strategy include -objective and scope,documentation,test process etc

Test plan is carried out by manager or lead
Test strategy is carried out by project manager
Test plan can be changed 
Test strategy cannot be changed