A. Network
B. Transport
C. Application
D. Physical

A. Physical
B. Data link
C. Network
D. Transport

A. Modified
B. Removed
C. Added
D. All of the mentioned

A. Physical
B. Network
C. Application
D. Session

A. Mail service
B. File transfer
C. Remote access
D. All of the mentioned

A. Failure of a link
B. Failure of a site
C. Loss of message
D. All of the mentioned

A. Scalability
B. Fault-tolerance
C. Clustering
D. All of the mentioned

A. Application
B. Presentation
C. Transport
D. Data link

A. Post repairing integration with main system should happen smoothly and gracefully
B. Upon link failure both parties at end must not be notified
C. Fault recovery system must me adjusted
D. Failures are logged systematically