Networking and Cybersecurity MCQs with Explanations

The layers from the bottom are Physical (1), Data Link (2), Network (3), Transport (4), Session (5), Presentation (6) and Application (7), so Transport is the fourth. The third layer is the Network layer, which is the most common wrong pick because it also deals with end-to-end delivery.

A router forwards packets at layer 3 using IP addresses, so that pairing is correct. A hub is a layer 1 repeater that floods signals to every port, while switches and bridges both work at layer 2 using MAC addresses, making the first three options wrong.

UDP sends datagrams without setting up a session or waiting for acknowledgements, so it is fast but unreliable - ideal for VoIP and streaming, where a late packet is worthless anyway. TCP is the reliable connection-oriented alternative, and FTP and HTTP are application-layer protocols that run over TCP.

An IPv4 address is 32 bits long and is written as four decimal octets, each 0-255. Class C networks cover first-octet values 192 to 223.

Port 25 is SMTP, used for submitting mail. Port 21 is the FTP control channel, port 23 is Telnet, and port 22 is SSH, the encrypted replacement for Telnet remote login.

DNS is the distributed directory that turns a name such as example.pk into an IP address (port 53), and DHCP leases the addressing configuration to devices as they join the network. The last option describes ARP, not DHCP, and browser encryption is the work of TLS over HTTPS.

A full mesh keeps redundant paths between all pairs of nodes, so no single link or node failure can isolate the network - the price is heavy cabling and n(n-1)/2 links. In a star everything depends on the central hub or switch, a bus dies if its backbone cable is cut, and a ring can be halted by one break.

802.11ac works only in the 5 GHz band, using wide channels and multiple streams for high throughput. The 2.4 GHz band belongs to 802.11b and 802.11g, which is why it is the tempting but wrong choice, and 60 GHz is used by 802.11ad.

A Metropolitan Area Network spans a city and sits between a building or campus LAN and a country-wide or global WAN. The tempting LAN answer applies only to a single site, while a PAN covers a few metres around one person, such as Bluetooth links.

A firewall enforces an access-control policy on flows between network zones through packet filtering, stateful inspection or proxying. A modem only modulates signals for a line, a NIC is a host's network adapter, and a spam filter screens e-mail content rather than network traffic.

Asymmetric encryption uses a public key for enciphering and the matching private key for deciphering, which solves key distribution and enables digital signatures. Symmetric systems such as AES rely on one shared secret, while hashing is a one-way digest that cannot be decrypted at all.

Phishing is the fraudulent attempt to obtain credentials or payment data by impersonating a trusted party, usually by e-mail or SMS. Ransomware is different: it encrypts the victim's files and demands payment, wardriving maps wireless networks, and sniffing is passive interception of traffic.

A worm is self-propagating: it exploits network services to copy itself without user action, which is how outbreaks spread machine to machine. A virus needs a host file or document and user action to execute, a trojan is harmful code disguised as legitimate software, and spyware is defined by covert data collection rather than replication.

VoIP stands for Voice over Internet Protocol, the carrying of voice calls as IP packets. The others are mis-expanded: ISP is Internet Service Provider, URL is Uniform Resource Locator, and HTML is HyperText Markup Language while HTTP is the HyperText Transfer Protocol.

First boot sector virus is brian .

Viruses are often delivered to a PC through an email attachment and are often designed to do harm.

The first Network is called ARPANET .

DHCP is the correct answer to “Which protocol is used to automatically assign TCP/IP configuration information”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Cloud Computing is a type of computing that performs computation, storage and even applications as a service across a network.

Repeater is the correct answer to “In IT networking, which of the following device is used in physical layer”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

The communication protocol used by Internet is TCP/IP .

Speed of internet connection is measured in Mbps .

AVI is widely used for transmitting streaming videos data on the internet.

Combination of two or more networks are called Internetwork .

Star is the correct answer to “Which Network topology needs HUB for its working”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

In the email dialogue box Bcc is used for writing the Email Address .

Latin is the correct answer to “Virus is the word of which language”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

The speed of communications between any two devices on the Ethernet LAN is Both A and B .

The first web browser is Mosaic .

every computer is capable of playing the role of client, server or both at the same time is the correct answer to “In peer-to-peer networking:”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

In 1999, the Melissa virus was a widely publicized: E-mail virus .

An Email is a combination of User Name and Domain Name .

Protocol are set of rules and procedures to control the data transmission over the internet.

LAN stands for Local Area Network .

BUS is the correct answer to “Which of the following is a network topology”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Fourth generation mobile technology provides enhanced capabilities allowing the transfer of both voice and non-voice data, including full-motion video, high-speed internet access, and video conferencing.

Biometrics is the measurement of things such as fingerprints and retinal scans used for security access.

Insta notes is the correct answer to “Which of these is not a means of personal communication on the internet”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Spybot is the correct answer to “What is the name of an application program that gathers user information and sends it to someone through the Internet”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

Memory or disk space. is the correct answer to “The thing that eventually terminates a worm virus is a lack of:”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

In 1999, the Melissa virus was a widely publicised: E-mail virus. .

A device that connects to a network without the use of cables is said to be none of these .

All of the following are examples of real security and privacy risks EXCEPT Spam .

A self replicating program, similar to a virus which was taken from a 1970s science fiction novel by John Bruner entitled the Shockwave Rider is Worm .

Modem is the correct answer to “Which device is required for the Internet connection”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

WAN stands for Wide Area Network .

Vint Cerf is the correct answer to “Who is the father of Internet”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

If you have a PowerPoint show you created and want to send using email to another teacher you can add the show to your email message as a (an) Attachment .

File >> Share >> Email is the correct answer to “In order to email a Word document from within MS Word 2016”. Items of this type are drawn from the Networking & Cyber Security syllabus of Pakistani competitive exams, where the fact is tested verbatim.

If you have a PowerPoint show you created and want to send using email to another teacher you can add the show to your email message as a (an) Attachment .