Basic CS-Networks [3i Infotech Placement]: Sample Questions 79 - 80 of 90

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Question 79


Describe in Detail


What is difference between a LAN & a WAN?


Difference between PAN, WAN and LAN
Difference between WAN and LAN
Local Area NetworkWide Area Network
Cover local area only.Cover large areas.
Small area- like a home, office, school, or group of buildings.

The network in an office building can be a LAN

Network with communications links crossing metropolitan, regional, or national boundaries over a long distance.

Internet is a good example of a WAN

High speed (1000 mbps)Less speed (150 mbps)
High data transfer rate.Lower data transfer rate.
One LAN can be connected to other LANs over any distance via telephone lines and radio wavesComputers in a wide-area network are often connected through public networks, such as the telephone system.

Question 80


Describe in Detail


What does the protocol FTP do


Define FTP Client on Client PC Conction to FTP Server
  • File Transfer Protocol is used for transmitting files over TCP/IP connections.
  • Relies on two communications channels between client and server.

Active and Passive connection mode:

  • In an Active FTP connection, the client opens a port and listens and the server actively connects to it.
  • In a Passive FTP connection, the server opens a port and listens and the client connects to it.

Active mode:

Understanding of Active Mode

For Active mode of connection firewall must accept connections to FTP client port.

Passive mode:

Understanding of Passive Mode
  • Use Passive mode to connect to an FTP server.
  • FTP servers support the Passive mode.
  • Passive FTP connection to succeed, the FTP server administrator must set firewall to accept all connections to any ports that the FTP server may open.

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