Network communication

1. Daffodil International University, EEE
Name
Md. Mujahiduzzaman

2. Cellular Network
Half And Full Duplex
Circuit-switched network
Radio Communication
HTTP Protocol
 File Transfer Protocol
NAT
DSL

3.  A cellular network is a radio network made up of a number of radio cells each
served by at least one fixed location transceiver known as a base station.
 Reduced power usage.
 Larger coverage area.
 An example of a simple non-telephone cellular system is an taxi drivers radio
system.

5. Half duplex is a both stations transmit , but only
one at a time.
Example: police radio
Full duplex is a simultaneous transmissions.
Example: telephone

7.  Connection-oriented network is called a circuit-switched network.
 Circuit switched networks did not dynamically recreate dropped circuits.
 Example: telephone network .
Link: http://www.highteck.net/EN/Basic/Internetworking.html

9.  It is wireless communication system.
 The information is being carried by the electromagnetic waves .
 electromagnetic waves are waves that travel at the speed of light
and made up of an electrical field.

11.  Hypertext Transfer Protocol.
HTTP client sends a request message to an HTTP server.
 HTTP is a stateless protocol.
Link:
https://www.ntu.edu.sg/home/ehchua/programming/webprogramm
ing/HTTP_Basics.html

13.  it is very uncommon to share folders over the Internet.
File transfers over the Internet use special techniques, of which
one of the oldest and most widely-used is FTP.
 File Transfer Protocol can transfer files between any
computers that have an Internet connection.
It works between computers using totally different operating
systems.
Link: http://www.deskshare.com/resources/articles/ftp-how-to.aspx

15.  NAT means Network Address Translation.
 The simplest type of NAT provides a one-to-one translation of
IP addresses.
Basic NATs can be used to interconnect two IP networks that
have incompatible addressing.
Network address translation is not commonly used in IPv6
Link:
https://en.wikipedia.org/wiki/Network_address_translation#NAT_i
n_IPv6
https://en.wikibooks.org/wiki/Communication_Networks/NAT_an

17.  DNS means Domain Name System.
The root DNS server maintains information about where a top-
level (.com) DNS server is located and returns this information to
the ISP’s DNS Server.
he ISP’s DNS server redirects the query to a top-level (.com)
DNS server.
Lastly, the ISP’s DNS server sends the IP address to the client
computer so the client can access www.yourcompany.com.
Link: http://www.uxworld.com/?p=384

19.  SMTP means Simple Mail Transfer Protocol.
SMTP sender sends MAIL command indicating the sender of the
mail.
 The SMTP-Sender then sends a command identifying a
recipient of the mail.
Sending machine is operating as a client and the receiving as a
server.
Link:
http://www.ee.surrey.ac.uk/Projects/CAL/networks/Network-
Transport_Application_Layers.htm#smtp

21.  DSL means Digital Subscriber Lines.
 range from 128 kbps to 1.54 Mbps.
 DSL achieves higher data transfer rates by utilizing more of the
available bandwidth spectrum.
 frequency range 0 ~ 3400 Hz.
 larger bandwidth is available, allowing for greater transfer rates.
Link: http://www.infocellar.com/cable-dsl/DSL.htm