History of Data Communication

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Questions and Answers

Who proposed a communication line between villages using 26 parallel wires to represent each letter of the alphabet?

Guglielmo Marconi

Carl Friedrich Gauss (correct)

Alexander Graham Bell

Samuel Morse

What did Samuel Morse contribute to the field of data communications?

The first wireless telegraph

The invention of the telephone

The first successful data communication system using binary coded signals (correct)

The development of geostationary satellites

Which satellite was the first geostationary communications satellite?

Sputnik-1

Syncom-2 (correct)

Maya-1

Syncom-1

Which of the following correctly identifies the first successful data communication invention?

Telegraph (A) Signup and view all the answers

What was the primary purpose of the computer network as defined in the content?

To share resources among interconnected computers (B) Signup and view all the answers

Which notable achievement is associated with the launch of Sputnik-1?

Earth's first satellite (B) Signup and view all the answers

Which individual is credited with founding the American Telephone and Telegraph Company?

Alexander Graham Bell (A) Signup and view all the answers

What are protocols in the context of a computer network?

The rules and agreements guiding network operations (D) Signup and view all the answers

Which type of network is primarily confined to one building or cluster of buildings?

Local Area Network (A) Signup and view all the answers

Which network model allows all computers to share their resources with each other?

Peer to peer (B) Signup and view all the answers

What is a key characteristic of a Physical Mesh Topology?

Every station has a direct communication link to every other station. (D) Signup and view all the answers

Which classification of computer networks includes connections between two or more countries?

Global Area Network (C) Signup and view all the answers

Which of the following is a disadvantage of Physical Mesh Topology?

Expensive and bulky cabling lines. (D) Signup and view all the answers

In a network where a server provides resources and clients make requests, what role does the server play?

Resource provider (B) Signup and view all the answers

Which type of network spans multiple cities and typically utilizes facilities from telecom providers?

Wide Area Network (B) Signup and view all the answers

What describes the Logical Topology of a network?

How data actually flows through the network. (A) Signup and view all the answers

What is a significant disadvantage of the physical star topology?

If the central hub breaks down, all communications are disrupted. (C) Signup and view all the answers

Which of the following is a benefit of the physical bus topology?

It requires less cable than other topologies. (A) Signup and view all the answers

What is a key characteristic of the physical ring topology?

Each station is linked in a closed loop. (C) Signup and view all the answers

Which statement accurately describes the physical tree topology?

It facilitates easy maintenance and fault identification. (B) Signup and view all the answers

What is a notable disadvantage of the physical ring topology?

The network can be disrupted if a single cable fails. (C) Signup and view all the answers

What distinguishes a hybrid topology compared to traditional topologies?

It is more complex and combines two or more traditional topologies. (B) Signup and view all the answers

Which of the following is a weakness of the physical bus topology?

Everything is affected if the cable breaks. (D) Signup and view all the answers

What is a primary advantage of using physical star topology over mesh topology?

Star topology often requires less cable. (D) Signup and view all the answers

Study Notes

Data Communication History

1753: Proposal for a communication line between villages using 26 parallel wires, one for each letter of the alphabet.
1833: Carl Friedrich Gauss developed a system using a 5x5 matrix to represent letters, allowing messages to be sent on a single wire.
1834: Samuel Finley Breese Morse contributed to the single-wire telegraph, inventing the first successful data communication system using binary coded electrical signals. He also developed Morse code (dots and dashes).
1840: Morse secured an American patent for the telegraph.
1844: The first telegraph line was established. The first message was "What hath God wrought!".
1875: Alexander Graham Bell is credited with inventing the telephone. He founded the American Telephone and Telegraph Company in 1885.
1899: Guglielmo Marconi succeeded in sending radio (wireless) telegraph messages.
1957: Launch of Sputnik-1, Earth's first satellite, launched by the Soviet Union on October 4, 1957.

Network History

1963: Syncom-1 launched, intended to be the first geostationary satellite but failed due to electronic issues.
1963: Syncom-2 launched, world's first geostationary communications satellite, placed over the Atlantic Ocean and Brazil.
1964: Syncom-3 launched, first geostationary satellite to provide live television coverage, covering the 1964 Tokyo Olympics.
Diwata-1 (AKA PHIL Microsat-1): First Philippine satellite and microsatellite launched. Micosatellite launched to the ISS on March 23, 2016.
Maya-1, Maya-3, Maya-4: Filipino-made cube satellites, returned to earth after ten-month missions.

Computer Networks

Computer Network: Two or more interconnected computers sharing resources.
Elements of a Computer Network: Protocols (rules for operation), Protocol Stack(list of protocols), Data and Messages(information), Communication Medium(connects devices), Devices (computers, routers, switches, etc.).
Network Classification (by geographic scope):
- Personal Area Network (PAN): Computers confined to a building or cluster of buildings. Typically privately owned.
- Local Area Network (LAN): Computers within a city or cluster of cities, often using facilities of telecom providers.
- Metropolitan Area Network (MAN): Computers outside a building or cluster of buildings.
- Wide Area Network (WAN): Computers in different countries or continents. Often referred to as the internet (internet).

Network Topology

Physical Topology:

Point-to-Point: Only two stations are connected. Simple, but limited communication.
Multipoint: Connects three or more stations. More complex.
Mesh: Every station has a direct communication path to every other station, completely connected
Bus: All stations are connected to a single transmission medium
Star: Stations are connected directly to a central device (hub or switch). Easier to add/remove devices, less cable needed, but loss of all connections if the central device fails
Ring: Stations are connected in a closed loop.

Logical Topology: Describes how data flows through a network.

Tree: Central root node (top level) connects to other nodes that are one level lower.
Hybrid: Combines two or more traditional topologies

Network Topology (Advantages/Disadvantages)

This section summarizes the advantages and disadvantages of each topology.*

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Description

Test your knowledge on the milestones in the history of data communication, from the early telegraph systems to the launch of satellites. This quiz covers key developments and inventors in the field, which laid the groundwork for modern communication technologies. Explore how innovations like Morse code and wireless telegraphs transformed the way we connect.