Os Networks - Technical Aptitude Questions & Answers

Which CPU scheduling algorithm can cause starvation (indefinite waiting)?

A.Priority Scheduling

B.Round Robin

C.FCFS

D.SRTF (when no preemption)

What are the four necessary conditions for a deadlock to occur? (Coffman's conditions)

A.Mutual Exclusion, Hold & Wait, No Preemption, Circular Wait

B.Mutual Exclusion, Preemption, Hold & Wait, Starvation

C.Circular Wait, Starvation, Preemption, Resource Sharing

D.Hold & Wait, No Preemption, Resource Sharing, Blocking

In which OSI layer does routing take place?

A.Network Layer (Layer 3)

B.Data Link Layer (Layer 2)

C.Transport Layer (Layer 4)

D.Physical Layer (Layer 1)

What is the difference between a process and a thread?

A.A process is an independent execution unit with its own memory; a thread shares memory within a process

B.They are identical

C.A thread has its own memory; a process shares memory

D.A process is lighter than a thread

What does IP address 192.168.1.0/24 represent?

A.A subnet with 254 usable host addresses

B.A single host address

C.A loopback address

D.A broadcast address

What is the purpose of the TCP three-way handshake?

A.To establish a reliable connection between client and server (SYN → SYN-ACK → ACK)

B.To terminate a connection

C.To transfer data

D.To discover IP addresses

What is virtual memory?

A.An abstraction that allows processes to use more memory than physically available by using disk space

B.RAM installed on a GPU

C.A fast cache between CPU and RAM

D.Memory used exclusively by the OS

Which layer of the OSI model is responsible for error detection and framing?

A.Data Link Layer (Layer 2)

B.Network Layer (Layer 3)

C.Physical Layer (Layer 1)

D.Transport Layer (Layer 4)

What is a page fault?

A.When a program accesses a page not currently loaded in RAM

B.When RAM is full

C.When the CPU encounters an illegal instruction

D.When a process terminates unexpectedly

What is the difference between TCP and UDP?

A.TCP is reliable/connection-oriented; UDP is fast/connectionless with no delivery guarantee

B.TCP is faster; UDP is slower

C.UDP is used for file transfer; TCP for video streaming

D.They are identical at the application layer

What scheduling algorithm is used by default in most modern OS for interactive tasks?

A.Round Robin (with time quantum)

B.FCFS

C.Shortest Job First

D.Priority Scheduling

What is the role of DNS (Domain Name System)?

A.Translates human-readable domain names to IP addresses

B.Assigns IP addresses dynamically

C.Routes packets between networks

D.Encrypts web traffic

What is thrashing in an OS?

A.When the OS spends more time swapping pages in/out than executing processes

B.When CPU usage reaches 100%

C.When too many processes are created

D.When disk storage is full

Which of the following is a Class C IP address?

A.192.168.1.1

B.10.0.0.1

C.172.16.0.1

D.127.0.0.1

What does the HTTP status code 404 mean?

A.Not Found — resource doesn't exist on server

B.Internal Server Error

C.Unauthorized

D.Redirect

What is a semaphore in OS?

A.A synchronization variable used to control access to shared resources

B.A type of process

C.A memory management unit

D.A CPU scheduling algorithm

What is the difference between IPv4 and IPv6?

A.IPv4 uses 32-bit addresses (4.3 billion); IPv6 uses 128-bit addresses (virtually unlimited)

B.IPv6 is slower than IPv4

C.IPv4 supports more devices than IPv6

D.They are identical in address size

What is context switching?

A.The process of saving the state of a running process and loading the state of another

B.Switching between RAM and disk

C.Switching the OS kernel

D.Changing the CPU frequency

Which protocol is used to automatically assign IP addresses to devices on a network?

A.DHCP (Dynamic Host Configuration Protocol)

B.DNS

C.ARP

D.ICMP

What is the Banker's Algorithm used for in OS?

A.Deadlock avoidance by checking safe state before allocating resources

B.CPU scheduling

C.Memory paging

D.Process creation

OS & Networks Basics

OS & Networks Basics