Operating Systems for Programmers - Module 5 - Pre-Quiz

Question 1

Which of the following is true of the Java programming language in relation to protection?

Accepted Answer

When a class is loaded, the JVM assigns the class to a protection domain that gives the permissions of that class.

Answer

It does not support the dynamic loading of untrusted classes over a network.

Answer

It does not support the execution of mutually distrusting classes within the same JVM.

Answer

Methods in the calling sequence are not responsible for requests to access a protected resource.

Question 2

A ____ virus changes each time it is installed to avoid detection by antivirus software.

Accepted Answer

polymorphic

Answer

tunneling

Answer

multipartite

Answer

stealth

Question 3

In capability lists, each object has a ____ to denote its type.

Accepted Answer

tag

Answer

gate

Answer

key

Answer

lock

Question 4

In MULTICS, the protection domains are organized in a _____.

Accepted Answer

ring structure

Answer

star structure

Answer

linear structure

Answer

directory structure

Question 5

A code segment that misuses its environment is called ____.

Accepted Answer

a Trojan horse

Answer

a backdoor

Answer

a trap door

Answer

a worm

Question 6

Which of the following implementations of the access matrix is a compromise between two other implementations listed below?

Accepted Answer

lock-key

Answer

access list

Answer

capability list

Answer

global table

Question 7

In a paired-password system, ____.

Accepted Answer

the computer supplies one part of a password and the user enters the other part

Answer

the user specifies two passwords

Answer

passwords must contain equal amounts of numbers and digits paired together

Answer

two users must enter their own separate password to gain access to the system

Question 8

Which of the following is a true statement regarding the relative merits between access rights enforcement based solely on a kernel, as opposed to enforcement provided largely by a compiler?

Accepted Answer

Enforcement by the kernel is less flexible than enforcement by the programming language for user-defined policy.

Answer

Enforcement by the compiler provides a greater degree of security.

Answer

Kernel-based enforcement has the advantage that static access enforcement can be verified off-line at compile time.

Answer

The fixed overhead of kernel calls cannot often be avoided in a compiler-based enforcement.

Question 9

A denial of service attack is ____.

Accepted Answer

aimed at disrupting legitimate use of a system

Answer

aimed at gaining information

Answer

aimed at stealing resources

Answer

generally not network based

Question 10

A ____ is a public key digitally signed by a trusted party.

Accepted Answer

digital certificate

Answer

key ring

Answer

message digest

Answer

digital key

Operating Systems for Programmers - Module 5 - Pre-Quiz

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