An internetwork connects individual networks together so they function as a single large network. It addresses the challenges of connecting different networks that may use varying technologies and speeds. The OSI reference model describes how information passes through seven layers as it moves between software applications on different computer systems. Each layer adds control information in the form of headers and trailers to communicate with its peer layer on other systems. This allows information to be reliably exchanged between networked devices.
TCP/IP have 5 layers, whereas OSI model have 7 layers in its Model. TCP/IP is known for the secured connection and comunication. I have explained all functions and definitions of layers in TCP/IP Model
The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment.
TCP/IP have 5 layers, whereas OSI model have 7 layers in its Model. TCP/IP is known for the secured connection and comunication. I have explained all functions and definitions of layers in TCP/IP Model
The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment.
The International Standards Organization (ISO) developed the Open Systems Interconnection (OSI) model. It divides network communication into seven layers. ... Layers 5-7, called the the upper layers, contain application-level data
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Practical Wireless, Ethernet and TCP/IP NetworkingLiving Online
This manual commences with an overview of wireless communications and how radio works, followed by a practical discussion of Ethernet as this is always a key ingredient in a successful wireless implementation strategy. It will give you a clear understanding of the choices available to you in designing and implementing your own wireless and associated Ethernet networks.
MORE INFORMATION: http://www.idc-online.com/content/practical-wireless-ethernet-and-tcpip-networking-26?id=154
This is a notes about basic introduction of OSI Model & TCP/IP Model. It contain details about the seven layers of the OSI Model which are Application layer, Presentation Layer, Session Layer, Transport Layer, Network Layer, Data Link Layer, Physical Layer
The OSI Model (Open Systems Interconnection Model) is a conceptual framework used to describe the functions of a networking system. The OSI model characterizes computing functions into a universal set of rules and requirements in order to support interoperability between different products and software. In the OSI reference model, the communications between a computing system are split into seven different abstraction layers: Physical, Data Link, Network, Transport, Session, Presentation, and Application.
TCP/IP Model helps you to determine how a specific computer should be connected to the internet and how data should be transmitted between them. It helps you to create a virtual network when multiple computer networks are connected together. The purpose of the TCP/IP model is to allow communication over large distances.
Multi-cluster Kubernetes Networking- Patterns, Projects and GuidelinesSanjeev Rampal
Talk presented at Kubernetes Community Day, New York, May 2024.
Technical summary of Multi-Cluster Kubernetes Networking architectures with focus on 4 key topics.
1) Key patterns for Multi-cluster architectures
2) Architectural comparison of several OSS/ CNCF projects to address these patterns
3) Evolution trends for the APIs of these projects
4) Some design recommendations & guidelines for adopting/ deploying these solutions.
1.Wireless Communication System_Wireless communication is a broad term that i...JeyaPerumal1
Wireless communication involves the transmission of information over a distance without the help of wires, cables or any other forms of electrical conductors.
Wireless communication is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices.
Features of Wireless Communication
The evolution of wireless technology has brought many advancements with its effective features.
The transmitted distance can be anywhere between a few meters (for example, a television's remote control) and thousands of kilometers (for example, radio communication).
Wireless communication can be used for cellular telephony, wireless access to the internet, wireless home networking, and so on.
# Internet Security: Safeguarding Your Digital World
In the contemporary digital age, the internet is a cornerstone of our daily lives. It connects us to vast amounts of information, provides platforms for communication, enables commerce, and offers endless entertainment. However, with these conveniences come significant security challenges. Internet security is essential to protect our digital identities, sensitive data, and overall online experience. This comprehensive guide explores the multifaceted world of internet security, providing insights into its importance, common threats, and effective strategies to safeguard your digital world.
## Understanding Internet Security
Internet security encompasses the measures and protocols used to protect information, devices, and networks from unauthorized access, attacks, and damage. It involves a wide range of practices designed to safeguard data confidentiality, integrity, and availability. Effective internet security is crucial for individuals, businesses, and governments alike, as cyber threats continue to evolve in complexity and scale.
### Key Components of Internet Security
1. **Confidentiality**: Ensuring that information is accessible only to those authorized to access it.
2. **Integrity**: Protecting information from being altered or tampered with by unauthorized parties.
3. **Availability**: Ensuring that authorized users have reliable access to information and resources when needed.
## Common Internet Security Threats
Cyber threats are numerous and constantly evolving. Understanding these threats is the first step in protecting against them. Some of the most common internet security threats include:
### Malware
Malware, or malicious software, is designed to harm, exploit, or otherwise compromise a device, network, or service. Common types of malware include:
- **Viruses**: Programs that attach themselves to legitimate software and replicate, spreading to other programs and files.
- **Worms**: Standalone malware that replicates itself to spread to other computers.
- **Trojan Horses**: Malicious software disguised as legitimate software.
- **Ransomware**: Malware that encrypts a user's files and demands a ransom for the decryption key.
- **Spyware**: Software that secretly monitors and collects user information.
### Phishing
Phishing is a social engineering attack that aims to steal sensitive information such as usernames, passwords, and credit card details. Attackers often masquerade as trusted entities in email or other communication channels, tricking victims into providing their information.
### Man-in-the-Middle (MitM) Attacks
MitM attacks occur when an attacker intercepts and potentially alters communication between two parties without their knowledge. This can lead to the unauthorized acquisition of sensitive information.
### Denial-of-Service (DoS) and Distributed Denial-of-Service (DDoS) Attacks
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APNIC Foundation, presented by Ellisha Heppner at the PNG DNS Forum 2024APNIC
Ellisha Heppner, Grant Management Lead, presented an update on APNIC Foundation to the PNG DNS Forum held from 6 to 10 May, 2024 in Port Moresby, Papua New Guinea.
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2. What Is an Internetwork?
is a collection of individual networks, connected by
intermediate networking devices, that functions as a single
large network.
refers to the industry, products, and procedures that meet the
challenge of creating and administering internetworks.
3.
4. History of Internetworking
The first networks were time-sharing
networks that used mainframes and
attached terminals. Such environments
were implemented by both IBM’s Systems
Network Architecture (SNA) and Digital’s
network architecture.
5. Local-area networks (LANs)
evolved around the PC revolution. LANs
enabled multiple users in a relatively small
geographical area to exchange files and
messages, as well as access shared
resources such as file servers and printers.
6. Wide-area networks (WANs)
interconnect LANs with geographically
dispersed users to create connectivity.
Some of the technologies used for
connecting LANs include T1, T3, ATM,
ISDN, ADSL, Frame Relay, radio links, and
others. New methods of connecting
dispersed LANs are appearing everyday.
7. Today, high-speed LANs and switched
internetworks are becoming widely used,
largely because they operate at very high
speeds and support such high-bandwidth
applications as multimedia and
videoconferencing.
8. Internetworking evolved as a solution
to three key problems:
isolated LANs
duplication of resources
a lack of network management.
9. Isolated LANs
made electronic communication between
different offices or departments impossible.
10. Duplication of resources
meant that the same hardware and
software had to be supplied to each office
or department, as did separate support
staff.
11. lack of network management
meant that no centralized method of
managing and troubleshooting networks
existed.
13. Connectivity
The challenge when connecting various
systems is to support communication
among disparate technologies.
Different sites, for example, may use
different types of media operating at
varying speeds, or may even include
different types of systems that need to
communicate.
14. Reliability
Internetworks must provide a certain level
of reliability because companies rely
heavily on data communication.
This is an unpredictable world, so many
large internetworks include redundancy to
allow for communication even when
problems occur.
15. Network management
Network management must provide
centralized support and troubleshooting
capabilities in an internetwork.
Configuration, security, performance, and
other issues must be adequately addressed
for the internetwork to function smoothly.
Security within an internetwork is essential.
17. Open System Interconnection
Reference Model
describes how information from a software
application in one computer moves through
a network medium to a software application
in another computer.
developed by the International Organization
for Standardization (ISO) in 1984, and it is
now considered the primary architectural
model for intercomputer communications.
18. Seven layers of the Open System
Interconnection (OSI) reference model:
Layer 7—Application
• Layer 6—Presentation
• Layer 5—Session
• Layer 4—Transport
• Layer 3—Network
• Layer 2—Data link
• Layer 1—Physical
19. A handy way to remember the seven
layers is the sentence “All people seem to
need data processing.” The beginning letter
of each word corresponds to a layer.
All—Application layer
People—Presentation layer
Seem—Session layer
To—Transport layer
Need—Network layer
Data—Data link layer
Processing—Physical layer
20. Characteristics of the OSI Layers
The seven layers of the OSI reference model
can be divided into two categories: upper layers
and lower layers.
1. The upper layers of the OSI model deal with
application issues and generally are
implemented only in software.
2. The lower layers of the OSI model handle data
transport issues. The physical layer and the
data link layer are implemented in hardware and
software.
21.
22. Protocols
is a formal set of rules and conventions that
governs how computers exchange
information over a network medium.
implements the functions of one or more of
the OSI layers.
23. variety of communication protocols
LAN protocols
WAN protocols
network protocols
routing protocols
24. LAN protocols
operate at the physical and data link layers
of the OSI model and define
communication over the various LAN
media.
25. WAN protocols
operate at the lowest three layers of the
OSI model and define communication over
the various wide-area media.
26. Routing protocols
are network layer protocols that are
responsible for exchanging information
between routers so that the routers can
select the proper path for network traffic.
27. network protocols
are the various upper-layer protocols that
exist in a given protocol suite.
28. OSI Model and Communication
Between Systems
Information being transferred from a
software application in one computer
system to a software application in another
must pass through the OSI layers.
For example, a software application in
System A has information to transmit to a
software application in System B.
29. • The application program in System A will pass its
information to the application layer (Layer 7) of
System A.
• The application layer then passes the information
to the presentation layer (Layer 6), which relays
the data to the session layer (Layer 5), and so on
down to the physical layer (Layer 1).
30. • At the physical layer, the information
is placed on the physical network
medium and is sent across the
medium to System B.
31. • The physical layer of System B removes the
information from the physical medium, and then
its physical layer passes the information up to the
data link layer (Layer 2), which passes it to the
network layer (Layer 3), and so on, until it reaches
the application layer (Layer 7) of System B.
• Finally, the application layer of System B passes
the information to the recipient application
program to complete the communication process.
32. Interaction Between OSI Model
Layers
A given layer in the OSI model generally communicates with three
other OSI layers: the layer directly above it, the layer directly below
it, and its peer layer in other networked computer systems. The
data link layer in System A, for example, communicates with the
network layer of System A, the physical layer of System A, and the
data link layer in System B. Figure 1-4 illustrates this example.
33. OSI Layer Services
One OSI layer communicates with another layer to
make use of the services provided by the second layer.
The services provided by adjacent layers help a given
OSI layer communicate with its peer layer in other
computer systems.
Three basic elements are involved in layer services:
1. the service user
2. the service provider
3. service access point (SAP).
34. service user
is the OSI layer that requests services from
an adjacent OSI layer
35. service provider
is the OSI layer that provides services to
service users.
OSI layers can provide services to multiple
service users.
36. SAP
is a conceptual location at which one OSI
layer can request the services of another
OSI layer.
37. Figure 1-5 illustrates how these three elements
interact at the network and data link layers.
38. OSI Model Layers and Information
Exchange
The seven OSI layers use various forms of
control information to communicate with
their peer layers in other computer
systems.
This control information consists of specific
requests and instructions that are
exchanged between peer OSI layers.
39. Control information typically takes one of
two forms:
1. Headers are prepended to data that has
been passed down from upper layers.
2. Trailers are appended to data that has
been passed down from upper layers.
40. Information Exchange Process
The information exchange process occurs
between peer OSI layers.
Each layer in the source system adds
control information to data, and each layer
in the destination system analyzes and
removes the control information from that
data.
41. If System A has data from a software application to send to System
B, the data is passed to the application layer.
The application layer in System A then communicates any control
information required by the application layer in System B by
prepending a header to the data.
The resulting information unit (a header and the data) is passed to
the presentation layer, which prepends its own header containing
control information intended for the presentation layer in System B.
42. The information unit grows in size as each layer prepends its
own header (and, in some cases, a trailer) that contains
control information to be used by its peer layer in System B.
At the physical layer, the entire information unit is placed onto
the network medium.
The physical layer in System B receives the information unit
and passes it to the data link layer.
43. The data link layer in System B then reads the control
information contained in the header prepended by the data
link layer in System A.
The header is then removed, and the remainder of the
information unit is passed to the network layer.
44. Each layer performs the same actions: The layer reads the
header from its peer layer, strips it off, and passes the
remaining information unit to the next highest layer.
After the application layer performs these actions, the data is
passed to the recipient software application in System B, in
exactly the form in which it was transmitted by the application
in System A.