Networking RS Enterprise Archives - Page 4 of 4

Transport Layer of OSI Model (Layer-4)

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 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 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 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 (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 …

News | New CCNA 200-301 has been released (from 24-Feb-2024)

Cisco has announced new CCNA 200-301 Exam which has been effective from 24th February 2020. Below is the highlight & new syllabus in PDF. Single CCNA Exam for all Tracks (no more CCNA Security or CCNA Data Center etc) If you complete any current CCNA/CCDA certification before February 24, you’ll receive the new CCNA certification and a training badge in the corresponding technology area. If a candidate has already completed CCENT certification and would like to go for CCNA Exam, you still have time until 23rd February to complete your CCNA certification in the current program. Candidates will need Read More …

New CCIE has been Announced from Feb 2020!

Cisco has announced new CCIE Certification & relevant Exams which will be effective from 24th February 2020. New rules will apply from Feb-2020 for CCIE. Below are the major changes with explanation. What is the new CCIE Lab Exam Format? The updated CCIE Lab Exam covers the whole Network lifecycle now. It starts from Planning, Design, Deployment, Operation & continuous Optimization. Previously, it used to be only Diagnosis, Configuration & Troubleshooting only. There was a separate Track for Design & Planning. Below fig. shows the differences between old & new Lab exam format. Module 1: Design Format: Scenario Read More …

New Changes in Cisco CCNP!

Cisco has announced new CCNP Certification & relevant Exams which will be effective from 24th February 2020. New rules will apply from Feb-2020 for CCNP. Below are the major changes with explanation. What happens if you were in middle of your CCNP & have passed half already? If you were already preparing for CCNP RS in 2019 & have passed 1 or 2 exams already then your hard work is not wasted & you will receive credit towards new Certification scheme. Follow the below table for CCNP Routing & Switching (use the links at the end for other CCNP Read More …