Comp90015

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Last updated: October 31, 2023

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First submitted	October 31, 2023
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Hint	Answer
Transparency Expecations	Access
	Location
	Failure
	Mobility
	Performance
	Scaling
Socket Protocols	UDP
	TCP
What does DOS share that NOS does not?	OS
OS Components	Process Manager
	Communication Manager
	Thread Manager
	Memory Manager
	Supervisor
OS-level concurrency	Multitasking
Application-level concurrency	Multithreading
Benefits of Threads	Concurrency
	Reactive UI
	Non-blocking
	Asynchronicity
Threads in java	Extend Thread
	Implement Runnable
Thread Architectures	Worker pool
	Thread per request
	Thread per object
	Thread per connection
JSON > XML	Simpler
	Supports arrays
	Readable
	Data types
XML > JSON	Displayable
Reasons to use DS	Economy
	Reliability
	Availability
	Scalability
	Modularity
Consequences of using DS	Concurrency
	Heterogeneity
	Global Clock
	Failure
Possible failures in UDP	Data corruption
	Omission failure
	Order
Architectural Models	Client-server
	two-tier
	multi-tier
	cluster
	proxy server
	web applet
	mobile agent
	thin client
	p2p
Types of failures	omission
	arbitrary
	timing
Failure mitigations	Replication
	Checksum
OS basic components	Policy
	Mechanism
Kernel modes	User
	Supervisor
Microkernel provides these basic abstractions	Address space
	threads

Hint	Answer
	communication
Remote invocation protocols	Request
	Request-Reply
	Request-Reply-Acknowledge
Components of RPC system	Communication
	Stub procedure
	Dispatcher
	Server stub
Components of RMI system	Remote interface
	Servant Component
	Server
	Client
Aspects of indirect communication	Time uncoupling
	space uncoupling
Indirect communication systems	publish subscribe
	distributed message queue
	distributed shared memory
	tuple space
Modules in a file system (DFS)	directory
	file
	access control
	file access
	block
	device
directory service operations	lookup
	addname
	unname
	getnames
Caching policy options	write-through
	commit
Navigation types	iterative
	multicast
	recursive server
	non-recursive server
Security goals	privacy
	integrity
	availability
threat categories	leakage
	tampering
	vandalism
attack types	eavesdropping
	masquerading
	tampering
	replaying
	DOS
worst case assumptions	exposed interface
	insecure network
	broken passwords
	source code available
	resourced attacker
thread life cycle	new
	runnable
	running
	non-runnable
	terminated
caching strategies	read-ahead
	delayed-write
invocation semantics	maybe
	at least once
	at most once
How is FFS different from UNIX	stateless
	idempotent

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