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Computer network notes

computer network notes

A Computer network is nothing more than two or more computer connected together so that they can exchange data and information, share resources. In general a computer network is an interconnection of various computer system located at same or different places.

Get pdf files :

Chapter 1 Introduction to computer network (pptx)
Chapter 1.2 protocal Layers
Chapter 1.3 Application layer
Chapter 1.4 Transport layer
Chapter 1.5 Network layer

Chapter 2.1 Link layer and Local Area network
Chapter 2.2 Multimedia Networking

Other Related topics
IPV6 network
Multicast and multicast Routing

Old Question solution

This is the pdf of old question solved by Dependra Lal Shrestha from trinity international college( 2073 batch).
Here is the attached file for you!
Old question solution

Student sub netting workbook
student are permitted to Print the document and practice to earn the knowledge
Subnet Workbook
VLSM Exercise book

Uses of the computer Network

•Exchange of information between different computers. (File sharing)
• Interconnected small computers in place of large computers.
• Communication tools (voice , video)
• Some applications and technologies are examples of Distributed system. (Railway reservation system, Distributed databases etc).

Network Architecture

  1. Client server network

•Each client is assigned as account name and password that is verified by an authentication service.
•The authentication service guards access to the network.
•With the centralization of user accounts, security and access control, server based networks simplify the administration of large network.
•The concentration of network resources such as files, printers and applications on servers also makes it easier to backup and maintain the data.
•Resource can be located on specialized dedicated servers for easier access.

Advantages
•Easier to administer when the network is large.
•All data can be backed up on one central location.
•Highly secure due to centralized control.

Disadvantages
•Requires expensive, more powerful hardware for the server machines.
•Has a single point of failure user data is unavailable when the server is down. •Requires expensive specialized network administrative and operational software. •Requires a professional administrator.

2. Peer to peer Network

•Network computers act as equal partners, or peers.
•Each computer can take on the client function or the server function.
•Suppose computer A may request for a file from computer B, which then sends file to computer A. In this case, computer A acts like the client and computer B as server. •At a later time, their role may be reserved; individual users control their own resources.
•The users may decide to share certain files with other users.
•The users may also require authentication before they allow others to access their resources. Since individual users make these decisions, there is no central point of control or administration in the network.

Advantages
•Less expensive to implement.
•Doesn‘t require additional specialized network administration software.
•Doesn‘t require a dedicated network administrator.

Disadvantages
•Less secure.
•Each must be trained to perform administrative tasks.
•All machines sharing resources negatively impact the performance.

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