W W W . S S B T E C H C O M P U T E R . B L O G S P O T . C O M
INTRODUCTION OF INTERNET
NETWORK MEDIA
- 1.Wired (Guided Media)
- 2.Wireless (Unguided Media)
WIRED MEDIA-Transmission media is a pathway that carries the information from sender to receiver. This could be through wire, fiber optics, vacuum or coaxial cable.There are some guided media.
- 1.Twisted Pair Cable
- 2.Coaxial cables
- 3.Fiber-Optic Cable
WIRELESS MEDIA----Wireless media carry electromagnetic signals that represent the binary digits of data communications using radio or microwave frequencies. As a networking medium, wireless is not restricted to conductors or pathways, as are copper and fiber media.There are some Unguided media.
- 1.LAN( Local Area Network)
- 2.WAN ( Wide Area Network)
- 3.MAN ( Metropolitan Area Network)
LAN----It is a computer network that interconnects computers within a limited area such as a residence, school, labs, or office building. You can run multiple devices on it.
The communication quality is better in LAN, the transmission error rate is low as compare to WAN. You can use the different topology mainly Bus & Ring in LAN.
WAN---- The network which is spread over the globe & covers the entire world. WAN is known as ----------
- 1.Wireless Network
- 2.Public Network
- 3.Private Network
Wireless Network—Wireless is an important & wire-free technology that is very useful for internet users.
Public Network--- Public network are those networks which are installed and run by the telecommunication authorities & are made available to any organization or individual who subscribes. Ex... PSTN (Public Switched Telephone Network), PSDN ( Public Switched Data Network), VAN/VAD( Value Added Network Services)
Private Network--- The basic technique in all forms of private WAN is to use private circuits to link to the location be served by networks.
MAN- Stands for "Metropolitan Area Network." A MAN is a network that spans a large area, such as a town or city. It is larger than a campus area network (CAN), but smaller than a wide area network (WAN). An example of a MAN is a series of wireless routers distributed across a city.
PROTOCOL
Network Protocols are a set of rules for exchanging information. The exchange usually occurs much like a dialog between 2 computers. In the standard model known as OSI (Open System Interconnection), there is more than one protocol is used. Some protocols are---
- 1.FTP ( File Transfer Protocol)
- 2.TFTP( Trivial File Transfer Protocol)
- 3.Telnet—Used to login to a remote computer on the internet.
- 4.Gopher—It organizes the text or binary files in the menu structure. It can –TCP( Transmission Control Protocol) &
Five classes of IP address: A, B, C, D, and E. ...
Default Subnet Mask--Most home networks use the default subnet mask of 255.255. 255.0. However, an office network may be configured with a different subnet mask such as 255.255. 255.192, which limits the number of IP addresses to 64.
The Network Field--A Network Field Technician is responsible for network development and maintenance in the field for any organization. The individual works with the organizations...
The Host Field--A Host header field must be sent in all HTTP/1.1 request messages. A 400 (Bad ... <host>: the domain name of the server (for virtual hosting).
Non-default Masks.--If your network is not subnetted, you must use the subnet mask associated with your IP address class. The default subnet masks are shown in dotted decimal.
The Subnet Field--A subnetwork or subnet is a logical subdivision of an IP network. :1,16 The practice of dividing a network into two or more networks is called subnetting.
There are two types of IP Address are used--
IPV4 & IPV6
IPV4--The IPv4 address is a 32-bit number that uniquely identifies a network interface on a machine. An IPv4 address is typically written in decimal digits, formatted as four 8-bit fields that are separated by periods. Each 8-bit field represents a byte of the IPv4 address.
IPV6--An IPv6 address is 128 bits in length and consists of eight, 16-bit fields, with each field bounded by a colon. Each field must contain a hexadecimal number, in contrast to the dotted-decimal notation of IPv4 addresses.
TCP-- TCP (Transmission Control Protocol) is a standard that defines how to establish and maintain a network conversation through which application programs can exchange data. TCP works with the Internet Protocol (IP), which defines how computers send packets of data to each other.
DIFFERENCE BETWEEN IP & TCP--
TCP and IP are two separate computer network protocols. IP is the part that obtains the address to which data is sent. TCP is responsible for data delivery once that IP address has been found. ... TCP is all the technology that makes the phone ring, and that enables you to talk to someone on another phone.
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