Computer Knowledge

Computer Networks

2,614 Questions

Computer networks involve the architecture, protocols, and security measures used for digital communication. This collection covers OSI model layers, IP addressing, data transmission, and cryptographic standards. These concepts are vital for the computer knowledge sections of banking and government exams.

OSI model layersNetwork protocolsIP subnet maskingData encryption standardsServer configurationsNetwork commands

Computer Networks Questions

Multiple choice

A student is assigned to begin testing on a particular subnet. On examination of the segment, he notices the network is fully switched. Which of the following would allow him to begin sniffing traffic to or from devices on the subnet?

  1. Use sniffer to begin connecting

  2. Use nmap to begin a port scan

  3. Use snort to view all packets

  4. Use etherflood to create a MAC flood

  5. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Since the subnet is fully switched an attacker would need a force to switch to forward traffic to the port he is attached to.

Multiple choice

Port forwarding or port mapping is a name given to the combined technique of ___________.

  1. translating the address, packet filter and forwarding

  2. check for the opened ports n scan the ports

  3. getting the IP address

  4. botnets collection

  5. use TCP protocol to transfer
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Translating the address and/or port number of a packet to a new destination possibly accepting such packet in a packet filter and  (firewall)forwarding the packet according to the routing table.

Multiple choice

What is TKIP and how does it make WPA-2 a better security choice for your wireless network?

  1. Temporary Key Integration Protocol. It forces a key change every time a bit is sent.

  2. Temporary Key Integration Protocol. It forces a key change every 10,000 packets or so.

  3. Temporal Key Integrity Protocol. It forces a key change after every 10,000 packets or so.

  4. Transparent Key Internal protocol. It forces a key change after every 100 packets or so.

  5. Temporal Key Integrity Protocol. It forces a key change every time a bit is sent.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

TKIP is the acronym and it is correct.

Multiple choice

Which of these is not a feature of UDP?

  1. No guarantee of delivery

  2. Checksums

  3. Port Numbers

  4. Transaction-oriented

  5. Handshaking dialogues
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

UDP uses a simple transmission model with a minimum of protocol mechanism. It has no handshaking dialogues and thus exposes any unreliability of the underlying network protocol to the user's program.

Multiple choice

Which of the following computer networking protocols is used by a host computer to request its IP address when its MAC address is available?

  1. POP

  2. IMAP

  3. SMTP

  4. ARP

  5. RARP
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The Reverse Address Resolution Protocol (RARP) is a computer networking protocol used by a host computer to request its Internet Protocol (IPv4) address from an administrative host, when it has its Link Layer or hardware address available, such as a MAC address.

Multiple choice

In packet switching concept, what is a packet?

  1. It is a method of slicing the messages.

  2. It is the minimised allowable unit of a message.

  3. It is the discrete message.

  4. Both 1 and 2 are correct.

  5. All of the above are correct.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Packet switching is a method of slicing the digital message in discrete minimised allowable units. Each minimised unit is called a packet.

Multiple choice

Header in each packet consists of

  1. destination addresses

  2. number of bits in the message

  3. source address

  4. number of packets in entire message

  5. all of the above
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

All the options above are correct.

Multiple choice

In which technique are the outgoing acknowledgements delayed temporarily and sent along with the next outgoing data frame as ACK field?

  1. Bit stuffing

  2. Sliding window protocol

  3. Piggybacking

  4. Multicasting

  5. Anycast
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Piggybacking is a bi-directional data transmission technique in the network layer (OSI model). It makes the most of the sent data frames from receiver to emitter, adding the confirmation that the data frame sent by the sender was received successfully (ACK acknowledge). This practically means, that instead of sending an acknowledgement in an individual frame it is piggy-backed on the data frame.

Multiple choice

Which protocol does PPP use to identify the network layer protocol?

  1. X.25

  2. ISDN

  3. HDLC

  4. LCP

  5. NCP
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Network Control Protocols include the Internet Protocol Control Protocol for the Internet Protocol, the Internetwork Packet Exchange Control Protocol for the Internet Packet Exchange protocol, and the AppleTalk Control Protocol for AppleTalk.