Author: Arman Hasen

Session Layer of OSI Model (Layer-5)

Session Layer of OSI Model

Session layer of OSI Model is designed to allow devices to establish and manage sessions so that multiple channels could be established between same terminals and hosts. Session Layer is the fifth layer in the 7-Layer OSI Model after Transport Layer. Session Layer is also called as ‘Port Layer’. The main function of Session Layer is to establish, maintain and synchronize the interaction between communicating systems and hosts like computers and servers. It allows information of different streams, originating from different sources, to be properly combined or synchronized. OSI Model divides the network communication processes into seven layers in order Read More …

Transport Layer of OSI Model (Layer-4)

Transport Layer of OSI Model

Transport Layer is the fourth layer in 7 Layer OSI Model after Network Layer. Similar to Layer-2 and Layer-3, this layer also performs addressing & multiplexing but in different domain through TCP and UDP. OSI Model divides the network communication processes into seven layers in order to simplify it. Each layer performs specific functions to support the layers above it. The seven Layer model starts from Physical till Application Layer & Transport layer is in the middle. The core concept behind Transport layer is the “support of Multitasking”. It allows same computer, browser & internet connection to work on multiple Read More …

Network Layer of OSI Model (Layer-3)

Network Layer of OSI Model

Network Layer is the 3rd layer in 7-Layer OSI Model after Data Link Layer. This is the place where most Routing and network stuff resides. It controls the Logical boundaries of Network. Network Layer controls the operation in networking at routing layer. The main aim of this layer is to deliver packets from source to destination across multiple links or networks. If two computers or host systems are connected on the same link, then there is no need for a network layer. Each layer in OSI Model performs specific functions to support the layers above it. This 7x Layer model Read More …

Data Link Layer of OSI Model (Layer-2)

Data Link layer of OSI model

Data Link Layer of OSI Model is the second layer in seven layer model. Data Link layer performs two very important functions of physical addressing and switching. Data link layer is the place where most LAN, Ethernet and wireless LAN technologies are defined. Each layer in OSI Model has its own duties & specific functions to perform so that it can support the layers above it. Below figure shows the position of Data Link layer in the OSI Model: Data link layer controls the Layer-2 Network boundary. It provides functional and procedural methods of transferring data between two points. It Read More …

Physical Layer of OSI Model (Layer-1)

Physical Layer of OSI Model

Physical Layer of OSI Model is the first layer in seven layers for simplification. It is responsible for transmission of data between sending & receiving devices. It also defines the means of transmitting raw bits over the transmission media. Physical layer addresses how the data is carried over the Physical media rather than logical data packets over a physical data link connecting network nodes. Each layer in OSI Model has its own duties & specific functions to perform so that it can support the layers above it. Below figure shows the position of Physical layer in the OSI Model:   Read More …

TCP/IP Model

TCP/IP model is the practical model that every networking equipment manufacturer follows today whether it is Cisco, Huawei, Nokia, Ericsson or Juniper. TCP/IP Model is a standard reference Model for conceptualizing data communications between networks. The TCP/IP is a practical model that provides end to end data communication specifying how data should be encapsulated, routed and finally received at destination. It characterizes and standardizes the communication functions of a network system without regard to its underlying internal structure and technology. It is also called the ‘Internet Model’ or the ‘DoD Model’. TCP/IP is a Vendor Neutral Model. It resolved many Read More …

OSI Model

OSI-Model

“OSI Model (Open Systems Interconnection Model) is a reference tool and a reference model for data communications in networks”. It was the first conceptual model for standardized communication in computer Network systems.   Why do we need OSI Model? We need OSI Model for solution to our multiple problems; few of them are described here. Firstly, it is a vendor neutral model. Before OSI Model, each vendor had to use its own network model to manufacture network equipment. So, one vendor’s equipment & the network was not compatible with another vendor’s equipment. Clients and buyers were forced to buy all Read More …

Multicast Quiz (ENCOR / CCNP)

IP Multicast Quiz best for IT certifications like Cisco CCNA, CCNP, CCIE, Huawei HCNA, Juniper JNCIA, Microsoft MCSA/MCSE, …                  Also check our free Online Quizzes on all IT topics and CCNA, CCNP, CCIE including new Python Automation Programming. Free Online Quizzes (Best for Cisco CCNA, Huawei HCNA, N+) You can also view free study notes (Cheat sheets) on all IT and Cisco CCNA/CCNP/CCIE topics for long term memory: Networkwalks Summary Cheatsheets   Follow our Facebook Page & YouTube Channel for more updated Cheatsheets & Quizzes:  

QoS (Quality of Service) Quiz for Cisco ENCOR/CCNP

QoS (Quality of Service) Quiz best for IT certifications like Cisco CCNA, CCNP, CCIE, Huawei HCNA, Juniper JNCIA, Microsoft MCSA/MCSE, …            Also check our free Online Quizzes on all IT topics and CCNA, CCNP, CCIE including new Python Automation Programming. Free Online Quizzes (Best for Cisco CCNA, Huawei HCNA, N+) You can also view free study notes (Cheat sheets) on all IT and Cisco CCNA/CCNP/CCIE topics for long term memory: Networkwalks Summary Cheatsheets     Follow our Facebook Page & YouTube Channel for more updated Cheatsheets & Quizzes:  

Enterprise Network Architecture (tiered) Fabric Technologies Quiz (ENCOR / CCNP)

    Also check our free Online Quizzes on all IT topics and CCNA, CCNP, CCIE including new Python Automation Programming. Free Online Quizzes (Best for Cisco CCNA, Huawei HCNA, N+) You can also view free study notes (Cheat sheets) on all IT and Cisco CCNA/CCNP/CCIE topics for long term memory: Networkwalks Summary Cheatsheets     Follow our Facebook Page & YouTube Channel for more updated Cheatsheets & Quizzes: