Basic CS-Networks [3i Infotech Placement]: Sample Questions 79 - 80 of 90
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Question 79
Explanation
LAN | WAN |
Local Area Network | Wide 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 waves | Computers in a wide-area network are often connected through public networks, such as the telephone system. |
Question 80
Explanation
- 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:
For Active mode of connection firewall must accept connections to FTP client port.
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.