lesson 1 Flashcards
Define data communication with examples.
Data communication is process of transferring data between computers and other electronic devices.
eg: chat, email.
what is telecommunication? Write its examples.
Telecommunication is the process of transmitting information over a long distance. Example : mobile phone , radio etc.
Components of data communication
Data, Sender, Receiver, Protocol and Medium
What are the modes of data transmission?
- Simplex mode
- Half Duplex mode
- Full Duplex mode.
What are the communication media
- Guided (wired)
- Unguided (wireless)
Types of guided media
- Twisted pair cable
- Co-axial cable
- Fiber optic cable
Any three unguided transmission media
- Radio wave
- Satellite communication
- Micro wave, Infrared..
Two types of twisted pair cable
- Shielded twisted pair or STP (RJ 45)
- Unshielded twisted pair or UTP (D-shell)
Where is co-axial cable mainly used ?
Co-axial cable is mainly used for cable tv
Write features of fiber optic cable.
- It is the widely used cable nowadays.
- It uses light to carry the signal so it is the fastest cable. 3. It
Does radio waves transfer through wall?
Yes radio waves transfer through wall
what is bandwidth and does radio wave have higher bandwidth or lower bandwidth?
Bandwidth is the maximum amount of data transmitted over internet over within an specified time.
Radio waves have lower bandwidth
Can microwave transfer or pass through wall?
No, microwave cannot transfer through wall.
Does micro wave have higher bandwidth or lower bandwidth? and write its examples
Microwave have higher bandwidth. Microwaves examples: Bluetooth, Wifi devices
What is laser technology in data communication?
Laser technology for data communication involves using laser beams to transfer information over various distances, from short range to long range.
Does laser technology have higher bandwidth or lower bandwidth?
Laser technology have higher bandwidth.
Define computer network
Computer network is the group of computers connected through wire or wireless media in order to share or communicate information by following protocols
advantages of computer network
- Computer network enables us to share hardware devices such as printers.
- Computer network has allowed us to communicate people all over the world.
disadvantage of computer network
- Initial setup cost is very high for computer network
- Skilled person is required to handle the computer network
basic elements of computer networl
- hardware
- Computers
- Network devices such as routers, switches hub.
- connection medium: this is the path through which the data travels. It can be wired or wireless
Define protocols
Protocols are the rules and regulation that governs how computers communicate on the network
define device driver
A device driver is a software that acts as a translator between a hardware device and the operating system.
Advantages of lan
- Speed : LANs offer high-speed data transfer rates compared to other
networks like WANs (Wide Area Networks). - Resource Sharing: Devices on a LAN can easily share resources like
printers, scanners, and even software licenses.
two disadvantages of lan
- Limited Reach: LANs are confined to a small geographical area,
typically a single building, office floor, or home - Security Concerns: While LANs can be secure, they can also be more
vulnerable than WANs if not properly configured
advantages of MAN
- Speed: Much faster than WANs for very quick data movement within
a city. - Security: More secure than WANs due to their smaller coverage area
disadvantages of man
- Security: MANs cover a larger area than LANs, making them more
challenging to secure. - Cost: Setting up and maintaining a MAN can be expensive.
advantages of wan
- Long Distance Connectivity: This allows businesses with multiple
offices, organizations with remote branches, or even individuals
spread across different cities or countries to share resources and
collaborate seamlessly. - Scalability: WANs can be easily scaled to accommodate a growing
number of users and locations
disadvantages of wan
- Slower Speeds and Latency: Due to the vast distances involved, WAN
connections often experience slower data transfer rates. - Higher Cost and Complexity: Troubleshooting and managing security
across a geographically dispersed network can be more complex than
with a LAN
types of network architecture
- Peer to peer
- Client-server
- Centralized network
advantages of peer to peer
- Reduced cost :P2P networks eliminate the need for a dedicated
server, which can be expensive to purchase, maintain, and manage. - Simpler setup: Setting up a P2P network is also generally simpler
compared to client-server networks
disadvantage of peer to peer
- Security concerns : Malware and viruses can easily spread through
P2P networks if proper security software isn’t implemented on each
device. - Performance Issues: Unreliable file availability and unpredictable
download speeds
Two advantages of centralized network
- Centralized control: This allows administrators to easily implement
and enforce security policies like user authentication, and access
controls across the entire network. - Reliable Data Storage and Access: Centralized networks often store
data on a central server, ensuring consistent backups and easier
access controL
Two disadvantages of centralized network
- Single Point of Failure: If the server malfunctions or experiences an
outage, the entire network can become inaccessible. - Limited Scalability : Difficult and expensive to scale
Two advantages of client server network
- Security & Management: Centralized control on a server allows for
easier security enforcement and updates for all devices. - Performance & Scalability: The server efficiently allocates resources
and additional clients can be added without overloading the system
Two disadvantages of client server
architecture
- Reliance on Server: If the server fails, the entire network can go
down. - Performance Limitations: Too many client requests can overload the
server, slowing down performance
What is topology? And its types
Arrangements of computers in Local Area Network.
types:
1. Bus topology
2. Ring topology
3. star topology
Advantages of star topology
1.Easy Management and Troubleshooting: Centralized control
simplifies network management and fault isolation.
2.Scalability: Devices can be added or removed without disrupting the
network
disadvantage of star topology
- Single point of failure
- High initial cost
Full form of TCP/ IP and its use
Transmission Communication Protocol or Internet Protocol is used to handle communication over the internet.
HTTP and its function
Hyper text transfer protocol is used to transfer html documents
SMTP
Simple Mail Transfer Protocol is used to send mails.
POP
Post Office Protocol is used to retrive
mail
Function of ethernet
To transmit data on Lan using NIC
Gopher
Searching and retrieving on remote web servers
ARP
Address Resolution Protocol is used to convert network address into mac address.
CDP
Cisco discovery protocol is used to share data in cisco devices
VOIP
Voice over internet protocol is used to send voice over internet
