Computer Science/IT MCQs
Topic Notes: Computer Science/IT
MCQs and preparation resources for competitive exams, covering important concepts, past papers, and detailed explanations.
Plato
- Biography: Ancient Greek philosopher (427–347 BCE), student of Socrates and teacher of Aristotle, founder of the Academy in Athens.
- Important Ideas:
- Theory of Forms
- Philosopher-King
- Ideal State
4531
Which generation of cellular systems aims to provide universal personal communication?
Answer:
Third-generation
Third-generation (3G) systems were designed to provide higher data rates and more universal services like global roaming.
4532
Which of the following is a common method for filtering spam emails?
Answer:
Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM).
SPF and DKIM are email authentication methods that help detect when an email is being forged or spoofed, thereby aiding in the identification and filtering of spam.
4533
A \_\_ is a curbside unit that connects up to 96 subscriber telephones.
Answer:
Subscriber loop carrier (SLC)
An SLC is a piece of telecommunications equipment that concentrates telephone lines into a single high-speed digital link for connection to the central office.
4534
Which protocol is used to send email messages from a client to a server?
Answer:
SMTP
SMTP (Simple Mail Transfer Protocol) is used for sending email messages. POP3 and IMAP are used for retrieving emails, and HTTP is for web browsing.
4535
What is the primary role of a 'firewall' in network security, including email communication?
Answer:
To filter network traffic and block unauthorized access.
A firewall acts as a barrier between a trusted internal network and untrusted external networks (like the internet), controlling incoming and outgoing network traffic based on security rules.
4536
Why is it generally NOT recommended to send highly sensitive personal information via unencrypted email?
Answer:
Unencrypted emails can be intercepted and read by unauthorized parties.
Unencrypted emails travel across networks in plaintext, making them vulnerable to interception and eavesdropping by malicious actors. Encryption is essential for protecting sensitive data.
4537
HDSL uses which encoding method?
Answer:
2B1Q
HDSL uses 2 Binary, 1 Quaternary (2B1Q) line coding to transmit data efficiently.
4538
Which protocol is associated with sending secure emails over an encrypted connection using SMTP?
Answer:
SMTPS
SMTPS (Simple Mail Transfer Protocol Secure) is the version of SMTP that uses SSL/TLS encryption for secure email transmission. POP3S and IMAPS are for secure retrieval, and HTTPS is for secure web browsing.
4539
The most widely used technology in time-division switching is known as what?
Answer:
TSI
Time-Slot Interchange (TSI) is a fundamental technique in time-division switching where data from one time slot is moved to another.
4540
Which type of email attachment poses the highest security risk if mishandled?
Answer:
Executable (.exe, .bat) files.
Executable files (.exe, .bat, .zip containing executables) pose the highest risk because they can contain and run malicious code directly on your system once opened, unlike text, image, or even PDF files which require exploits to be dangerous.