All questions of Internet for Bank Exams Exam

The Invention of the Internet: Derived from ARPANET

The idea for the invention of the internet was derived from ARPANET. ARPANET, which stands for Advanced Research Projects Agency Network, was a pioneering packet-switching network and the first network to implement the TCP/IP protocol suite.

ARPANET: The Precursor to the Internet

- ARPANET was developed by the United States Department of Defense's Advanced Research Projects Agency (ARPA) in the late 1960s. It was initially created to connect computers at various research institutions and universities.
- The aim of ARPANET was to provide a decentralized network that could withstand a nuclear attack, making it a robust and reliable means of communication even in the event of a disaster.
- ARPANET used packet switching, a method of dividing data into small packets and routing them independently across a network. This was a significant departure from traditional circuit-switching networks, which required a dedicated connection for the duration of a communication.
- The development of ARPANET was a collaborative effort involving multiple research institutions, including universities such as UCLA, Stanford, and MIT.
- The first ARPANET connection was established in 1969 between UCLA and the Stanford Research Institute (SRI).
- Over time, ARPANET expanded to include more nodes and institutions, creating a network that spanned multiple geographic locations.

The Birth of the Internet

- The invention of the internet can be traced back to the development and evolution of ARPANET.
- In the early 1970s, the TCP/IP protocol suite was developed by a team led by Vinton Cerf and Robert Kahn. TCP/IP, which stands for Transmission Control Protocol/Internet Protocol, provided a standardized way for different computer networks to communicate with each other.
- The integration of TCP/IP into ARPANET laid the foundation for the modern internet. It allowed different networks, including ARPANET, to interconnect and exchange data seamlessly.
- As more networks adopted TCP/IP, the internet grew in size and popularity. The internet eventually expanded beyond its military and academic origins to become a global network accessible to the general public.

Conclusion

In conclusion, the idea for the invention of the internet was derived from ARPANET. ARPANET served as a precursor to the internet, providing the foundation for the development of the TCP/IP protocol suite and the interconnection of various computer networks. The integration of TCP/IP into ARPANET enabled the creation of a global network that revolutionized communication and information exchange. The internet has since become an indispensable tool for individuals, businesses, and governments worldwide.

Explanation:

A Local Area Network (LAN) is a network that connects computers and devices within a limited area, such as a home, office, or school. It allows connected devices to share information, resources, and peripheral equipment. Here is a detailed explanation of why option 'C' is the correct answer:

Sharing Information:
One of the main purposes of a LAN is to enable devices to share information. When computers are connected to a LAN, they can easily transfer files, documents, and data between each other. This allows for better collaboration and efficient communication within the network.

Sharing Peripheral Equipment:
Another benefit of a LAN is the ability to share peripheral equipment. Peripheral devices such as printers, scanners, and storage devices can be connected to a central server or a designated computer on the network. All other devices on the LAN can then access and use these peripherals, eliminating the need for individual devices for each computer.

Running Faster:
While being connected to a LAN does not directly make a computer run faster, it can enhance network performance. LANs typically have higher data transfer speeds compared to external internet connections. This means that data transfers between devices within the LAN can happen at faster rates, improving overall network performance.

Sending Email:
Being connected to a LAN enables computers to send and receive emails. LANs can be set up with email servers that handle incoming and outgoing email traffic. This allows users on the network to send emails to each other and to external email addresses.

Going Online:
While being connected to a LAN provides access to shared resources and devices within the network, it does not necessarily provide direct access to the internet. Additional network configurations, such as a router or gateway, are required to connect the LAN to the internet. Therefore, option 'B' is not correct in this case.

In conclusion, a computer connected to a LAN can share information and peripheral equipment, making option 'C' the correct answer.

Firewall
Firewall is the utility used to monitor and restrict the file transfer between two networks. It acts as a barrier between an internal network and external networks, such as the internet, and controls incoming and outgoing network traffic based on predetermined security rules.

Monitoring and Restricting File Transfer
- Firewall software can monitor the data packets passing through it and determine whether they meet the security criteria set by the network administrator.
- It can restrict file transfers by blocking certain types of traffic or specific ports that are commonly used for file transfers.
- Firewalls can also detect and prevent unauthorized access attempts and data breaches, thus protecting the network from potential security threats.

Types of Firewalls
- There are several types of firewalls, including network layer firewalls, application layer firewalls, and proxy firewalls, each with its own set of features and capabilities.
- Network layer firewalls filter traffic based on IP addresses and ports, while application layer firewalls inspect the content of data packets to make decisions.
- Proxy firewalls act as intermediaries between internal and external networks, providing an additional layer of security by hiding the internal network's IP addresses.

Importance of Firewalls
- Firewalls are essential for maintaining network security and preventing unauthorized access to sensitive data.
- They help organizations comply with regulatory requirements and protect their assets from cyber threats.
- By monitoring and restricting file transfers, firewalls play a crucial role in safeguarding the integrity and confidentiality of data transmitted over networks.

Network Communication and Application Standards

Network communication between applications is established and maintained according to certain standards that define the protocols and rules for data transmission. One of the most important standards is the Transmission Control Protocol (TCP).

TCP - Transmission Control Protocol

TCP is a widely used transport layer protocol that provides reliable communication over an IP network. It ensures that data packets are delivered in the correct order and without errors. TCP establishes a connection-oriented communication between applications, meaning that a connection is established before data is transmitted.

Establishing a Connection

When two applications want to communicate with each other over a network, TCP follows a three-way handshake process to establish a connection:

1. SYN: The client sends a SYN (synchronize) packet to the server, indicating its desire to establish a connection.
2. SYN-ACK: The server responds with a SYN-ACK packet, acknowledging the request and indicating its willingness to establish a connection.
3. ACK: The client sends an ACK (acknowledge) packet back to the server, confirming the connection establishment.

Maintaining the Connection

Once the connection is established, TCP ensures the reliable transmission of data by implementing various mechanisms:

1. Segmentation: TCP breaks the data into smaller segments and assigns a sequence number to each segment. This allows the receiver to reassemble the segments in the correct order.
2. Acknowledgment: After receiving each segment, the receiver sends an acknowledgment (ACK) back to the sender. If the sender does not receive an ACK within a certain time, it retransmits the segment.
3. Flow control: TCP monitors the receiver's buffer capacity and adjusts the transmission rate accordingly to prevent overflow or underflow of data.
4. Congestion control: TCP detects network congestion by monitoring the round-trip time of packets and the number of unacknowledged packets. It reduces the transmission rate to alleviate congestion and prevent network collapse.

Conclusion

In summary, the establishment and maintenance of network communication between applications follow the TCP standard. TCP ensures reliable data transmission by establishing a connection through a three-way handshake process and implementing mechanisms such as segmentation, acknowledgment, flow control, and congestion control.

Protocol
Protocol is a set of rules that govern the exchange of data between two devices. It ensures that data communication is successful, efficient, and error-free. Let's delve into the key aspects of protocols:

Definition
A protocol defines the format, timing, sequencing, and error control of the data exchange process. It specifies how data should be transmitted, received, and processed by the communicating devices.

Types of Protocols
There are various types of protocols used in data communication, such as:
- Transmission Control Protocol (TCP)
- Internet Protocol (IP)
- Hypertext Transfer Protocol (HTTP)
- File Transfer Protocol (FTP)
- Simple Mail Transfer Protocol (SMTP)

Role of Protocols
Protocols play a crucial role in data communication by:
- Ensuring reliable and secure data transmission
- Managing data flow and error detection
- Establishing connections between devices
- Handling data compression and encryption

Importance of Protocols
Following protocols is essential for successful data communication because:
- It standardizes the communication process
- It enables interoperability between different devices and networks
- It enhances the overall efficiency and performance of data exchange
In conclusion, protocols are fundamental for establishing a seamless and reliable data communication network. Adhering to these rules ensures that data is transmitted accurately and securely between communicating parties.