Computer Network: Welcome

Computer Network

A computer network is a system in which multiple computers are connected to each other to share information and resources.

Characteristics of a Computer Network-

1. Share resources from one computer to another.

2. Create files and store them in one computer, access those files from the other computer(s) connected over the network.

3. Connect a printer, scanner, or a fax machine to one computer within the network and let other computers of the network use the machines available over the network.

Computer Network: Services

Address's

Physical Address

The address that is pointing to at location is called "Physical address". A physical address is a binary number in the form of logical high and low states on an address bus that corresponds to a particular cell of primary storage(also called main memory), or to a particular register in a memory-mapped I/O(input/output) device.

Logical Address

The address that is pointing to a location in hard disk is known as "Logical address".A logical address is the address at which an item (memory cell, storage element, network host) appears to reside from the perspective of an executing application program. A logical address may be different from the physical address due to the operation of an address translator or mapping function.

Difference Between Phycial address and Logical address

1. The basic difference between Logical and physical address is that Logical address is generated by CPU in perspective of a program. On the other hand, the physical address is a location that exists in the memory unit. The set of all logical addresses generated by CPU for a program is called Logical Address Space.

2. The set of all logical addresses generated by a program is known as logical address space. Whereas, an address seen by the memory unit- that is, the one loaded into the memory-address register of the memory- is commonly referred to as physical address

Computer Network: Testimonials

1. In the computer is given an IP address it is printed as "Host".

2. Entire network will be represented by a number known as " Net ID".

3. Whenever IP address given to a computer , It's stored in the Hard disk.

Represented a IP address-

1. Binary Notation- If IP address represented in forms of 0's & 1's is known as Binary Notation.

Example- 011010 010110 010101 010111.

2. Dotted Decimal Notation- If IP address represented by decimal number separated by .(dot) that is known as Dotted decimal notation.

Example- 61. 51. 31. 10

1. Class A

2. Class B

3. Class C

4. Class D (Multicast)

5. Class E (Reserved)

1. Private IP address

i. Local LAN

ii. Local Host

iii. Private IP address

2. Public IP address

i. Not free of cost(internet)

ii. Scope is globe(globe unique)

Computer Network: News

what is circuit switching and packet switching??

Circuit and packet switching

1. In circuit switching, each data unit will have entire path address, where as packet switching data will have only destination address the intermediate path decide by router.

2. Circuit switching is not a store and forward technique,where as packet is a store and forward technique because router store a packet algorithm in applied and forward on the best path.

Topology

Network topology is the interconnected pattern of network elements. A network topology may be physical, mapping hardware configuration, or logical, mapping the path that the data must take in order to travel around the network.
There are many identified topologies but they are not strict, which means that any of them can be combined. However, each topology has a different standard and may use different hardware methods so they are not interchangeable.

Bus Topology

Bus topology is a network type in which every computer and network device is connected to single cable. When it has exactly two endpoints, then it is called Linear Bus topology.

Features of Bus Topology

It transmits data only in one direction.
Every device is connected to a single cable.

Computer Network: CV

Computer Network