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

DDoS stands for _________________

  1. Direct Distribution of Server

  2. Distributed Denial of Service

  3. Direct Distribution of Service

  4. Distributed Denial of Server
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DDoS is an acronym for Distributed Denial of Service. It involves multiple compromised systems flooding a target with traffic to make it unavailable.

Multiple choice

A packet with all flags set is which type of scan?

  1. Full Open

  2. Syn scan

  3. XMAS

  4. TCP connect
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

An XMAS scan sets the FIN, URG, and PUSH flags in a TCP packet. It is called an XMAS scan because the flags are 'lit up' like a Christmas tree.

Multiple choice

What are the three types of scanning?

  1. Port, network, and vulnerability

  2. Port, network, and services

  3. Grey, black, and white hat

  4. Server, client, and network
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Scanning in cybersecurity typically refers to port scanning, network scanning, and vulnerability scanning. These processes help identify open ports, active hosts, and security weaknesses.

Multiple choice

What port number does FTP use?

  1. 21

  2. 25

  3. 23

  4. 80
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

File Transfer Protocol (FTP) uses port 21 for the control connection. Port 20 is typically used for the data connection.

Multiple choice

What is the first step in establishing an IPsec VPN?

  1. detection of interesting traffic

  2. negotiation of ISAKMP policies

  3. creation of a tunnel to negotiate a security associat-policy

  4. creation of an IPsec tunnel between two IPsec peers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Before any tunnel can be established, the gateway must identify traffic that is designated to be protected by the IPsec tunnel, which is known as interesting traffic.

Multiple choice

Which statement describes the operation of the IKE protocol?

  1. It uses IPsec to establish the key exchange process.

  2. It uses hashing algorithms to transmit keys across a network

  3. It calculates shared keys based on exchange of data packets.

  4. Uses TCP port 50 to exchange IKE info between the gateways
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The IKE (Internet Key Exchange) protocol uses the Diffie-Hellman algorithm to securely exchange keys over an insecure network, allowing peers to calculate a shared secret key.

Multiple choice

What takes place during IKE Phase 2 when establishing an IPsec VPN?

  1. IPsec security associations are exchanged.

  2. Traffic is exchanged between IPsec peers.

  3. ISAKMP security associations are exchanged.

  4. Interesting traffic is identified.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

IKE Phase 1 establishes a secure channel (ISAKMP SA), while IKE Phase 2 uses that secure channel to negotiate the IPsec security associations (SAs) that will protect the actual data traffic.

Multiple choice

OpenVPN uses SSL/TLS for key exchange.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

OpenVPN uses the OpenSSL library to provide secure communication, utilizing SSL/TLS protocols for the initial key exchange and authentication between the client and the server.

Multiple choice

Select 2 VPN Tunnel Protocols

  1. L2TP

  2. PPP

  3. OpenVPN

  4. PCAP
Reveal answer Fill a bubble to check yourself
A,C Correct answer
Explanation

L2TP (Layer 2 Tunneling Protocol) and OpenVPN are both widely recognized protocols used to create VPN tunnels. PPP is a data link layer protocol, and PCAP is a packet capture format.

Multiple choice

Which of the following is a common tool used for port scanning?

  1. Nmap

  2. Metasploit

  3. Wireshark

  4. Nessus
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nmap is a popular tool used for port scanning, which is the process of identifying open ports on a network host. It can be used to discover services running on a host, identify potential vulnerabilities, and gather information about the network configuration.