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What is a computer network?
Computer network is a system of inter-connected computers (stations).
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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.
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What are the two most common wireless standards?
The most common standards used are WiFi and WiMAX.
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What are the typical network topologies?
The typical topologies are: bus, star, ring, mesh, tree topologies.
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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.
The IP address is a unique value that represents a computer in the global Internet.
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What is the difference between IPv4 and IPv6?
IPv4 addres is 32-bits long and IPv6 is 128-bits long.
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Which protocol is used to retrive web pages?
The HTTP protocol is used to comunnicate with the www server.
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Which port is typically used by the FTP protocol?
Port number 21 is typically used.
SSL is a set of encryption methods that provide secure data transmission over the Internet.
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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.
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What is the role of the ARP protocol?
ARP protocol is used to translate MAC addresses into IP addresses.
MAC is a unique network device number that is asigned to a device by the manufacturer.
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What is a Virtual Private Network?
A VPN is a netowork in which links are not carried by physical wires.
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