Interprocess Communication Part II

Question 1

Messages may be dropped occasionally, either because of a checksum error or because no buffer space is available at the source or destination, it’s called:

Answer 1

Omission Failures

Question 2

This assumes that when a pair of processes are establishing a connection, one of them plays the client role and another plays the server role, but thereafter they could be peers.

Answer 2

The API for stream communication

Question 3

The TCP protocol uses an acknowledgement scheme. If the sender does not receive an acknowledgement with a timeout, it retransmits the message and this is performed when:

Answer 3

There is lost messages

Question 4

This defines reliable communication for channels in terms of two properties: integrity and validity.

Answer 4

A failure model

Question 5

They are three alternative approaches to external data representation.

Answer 5

XML, CORBA and Java’s object serialization

Question 6

This was originated from BSD 4.x UNIX and provides the abstraction of a stream of bytes to which data may be written and from which data may be read.

Answer 6

The API to the TCP protocol

Question 7

This is the process of taking a collection of data items and assembling or disassembling (respectively) into a form suitable for transmission in a message.

Answer 7

Marshalling and Un-marshalling

Question 8

The TCP protocol attempts to match the speeds of the processes that read from and write to a stream, this is called:

Answer 8

Flow Control

Question 9

These items transmitted in messages can be data values of many different types, and not all computers store primitive values such as integers in the same order.

Answer 9

The individual primitive data