Basics of networks

Question 1

What is network?

Answer 1

Connection of 2 or more computers or devices for communication and sharing files between them.

Question 2

List the OSI model

Answer 2

Application layer
Presentation layer
Session layer
Transport layer
Network layer
Data link layer
Physical layer

Question 3

What is application layer

Answer 3

Provides interface b/w user and the computer.
Protocols used HTTP, HTTPS, FTP, SMTP, etc.

Question 4

What is presentation layer

Answer 4

Responsible for data translation, encryption/decryption, encode/decode, data compression.
Protocols- JPEG, TLS, SSL, MPEG.

Question 5

What is session layer

Answer 5

Responsible for connection establishment, data transfer(connection maintenance) & connection termination. Also ensures security.
Protocols- NetBIOS, RPC, etc.

Question 6

What is transport layer

Answer 6

Provides reliable message delivery from process to process( host to host). Maintains error control, flow control. Ensures data transmitted in order & no duplication.
Data format- SEGMENTS.
Protocols-TCP, UDP.

Question 7

What is network layer

Answer 7

Adds from & to address, Logical addressing, Shortest path selection & takes care of Packet routing.
Data format- PACKETS.
Protocols- IPv4, IPv6.
Device- Router, firewall, IPS.

Question 8

What is data link layer

Answer 8

Responsible for Node to node delivery of message. Data framing, error control & flow control. Also physical addressing.
Data format- FRAMES
Protocols- ARP
Device- Switch, Bridges.

Question 9

What is physical layer

Answer 9

Responsible for actual physical connection b/w devices.
Data format- Bits
Protocols- wired or wireless (Ethernet cable, optical fiber)
Device- Hub, Bluetooth, Wi-Fi.

Question 10

What is TCP/IP?

Answer 10

Transimission control protocal is a implemented model of communication between two devices.

Question 11

List of TCP/IP

Answer 11

Application layer- process to process
Transport layer- Host to host
Internet layer- Src to destn
Network access layer- Node to node

Question 12

What is HUB

Answer 12

Layer 1 Physical layer device.
Connects multiple computers.
Broadcast messages to all the devices connected to the hub.

Question 13

What is Switch

Answer 13

Layer 2 Data link layer device.
Connects two or more computers.
It sends message to the device for which the message needs to send.

Question 14

What is Router

Answer 14

Layer 3 network layer device.
Connects two or more networks.
Calculates the best route to send data using routing protocols.

Question 15

What is peer to peer

Answer 15

All computers on the network. or All devices connected to each other.

Question 16

What is Bridges

Answer 16

Layer 1 & 2. Used to connect two different LAN’s. Does filtering and forwarding.

Question 17

What is ARP request

Answer 17

Address resolution protocol- Gives corresponding MAC address(physical address) to the known IP address(logical address).

Question 18

Types of casting

Answer 18

Uni cast- one to one - One sender & one receiver
Broadcast- one to many - One sender & many receiver
Multi cast- one to groups - One sender & selected group of receiver.

Question 19

What is Ethernet

Answer 19

Ethernet is a family of computer networking technologies that allow devices to communicate with each other over a wired network.

Question 20

What is NAT & PAT

Question 21

What is 3-way handshake

Question 22

List IP header format

Question 22

What is TCP & UDP

Question 23

List TCP header format

Question 24

What is Firewall

Question 25

What is LAN

Question 26

WAN

Question 27

MAN

Question 28

What is Client

Question 29

What is Server

Question 30

What is host

Question 31

What is configuration