Distributed Systems

Jump to bottom Edit New page

J.Pu edited this page Oct 5, 2017 · 1 revision

Past Exams

DS Exam WS 2014/15

Models + Architecture of DS

Name 2 reasons justifying use of DS
Explain purpose of tiers in 3 tier architecture
2 reasons use services over (instead) objects and components

Communication

Name more than 3 features of RPC
Task of stubs in RPC communication
Principle of communication using message channel

Basic Services for DS

Describe message exchange for error free communication according to 2 phase commit protocol
Explain creation + validation of digital signature
Why need trust center / certificate authority for management of public keys with asym. cryptographic algorithms

Component based DS

Purpose of EJB local/remote interfaces. Differences?
Name more than 2 differences EJB <-> OSGi component models
Lamport Approch with P1, P2, P3

Business Processes + Web Services

Petri net specification for parallel execution of 3 activities, followed by alternative execution of 2 activities within workflow
What is specified in standards: WS Coordination, WS-AtomicTransaction, WS-BusinessActivity
Explain concept of Enterprise Service Bus

If somethings not right or I forgot something please feel free the comment!