Redes7

Question 1

When it does not transport a message from p’s outgoing
message buffer to q’s incoming message buffer which is
known as ‘dropping message’ we are talking about:

Answer 1

Communication omission failures

Question 2

When we say that a process has crashed we mean that it has
halted and will no execute any further steps of its program
ever, this is a type of:

Answer 2

Process omission failure.

Question 3

To model security threats, we postulate that this element is
capable of sending any message to any process and reading
or copying any message between a pair of processes.

Answer 3

The enemy in the security model

Question 4

In this, we talk about the security of a distributed system that
can be achieved by securing the processes and the channels
used for their interactions and by protecting the objects that
they encapsulate against unauthorized access.

Answer 4

The security model

Question 5

Encryption, authentication and Identification some times are
used to build __________ as a service layer on top of existing
communication services.

Answer 5

Secure channels