Computer networks FAQ

  • What is a computer network?

Computer network is a system of inter-connected computers (stations).
  • What are the typical physical media used to transmit the signal over a network?

Currently, the most common media used to transmit the signal over a network is elecromagnetic waves (radio waves) and cables.
  • What are the two most common wireless standards?

The most common standards used are WiFi and WiMAX.
  • What are the typical network topologies?

The typical topologies are: bus, star, ring, mesh, tree topologies.
  • What is the role of a firewall?

The firewall blocks unauthorized access to the computer form external network. For example, it can prevent so-called hackers from accessing the station by blocking suspicious data frames.
  • What is the IP address?

The IP address is a unique value that represents a computer in the global Internet.
  • What is the difference between IPv4 and IPv6?

IPv4 addres is 32-bits long and IPv6 is 128-bits long.
  • Which protocol is used to retrive web pages?

The HTTP protocol is used to comunnicate with the www server.
  • Which port is typically used by the FTP protocol?

Port number 21 is typically used.
  • What is SSL?

SSL is a set of encryption methods that provide secure data transmission over the Internet.
  • What is the difference between the symetric and asymetric cryptography?

In case of symetric cryptographt, the cipher uses the same key to encrypt and decrypt data. In case of a symetric cryptography two different keys are used to encrypt and decrypt data.
  • What is the role of the ARP protocol?

ARP protocol is used to translate MAC addresses into IP addresses.
  • What is MAC address?

MAC is a unique network device number that is asigned to a device by the manufacturer.
  • What is a Virtual Private Network?

A VPN is a netowork in which links are not carried by physical wires.

Mobbing Poland