Skip to main content

Hierarchical Network

 

A HIERARCHICAL NETWORK IS A NETWORK THAT IS DIVIDED INTO TWO OR MORE LAYERS, WITH EACH LAYER HAVING A SPECIFIC FUNCTION. THIS TYPE OF NETWORK DESIGN IS OFTEN USED IN LARGE AND COMPLEX NETWORKS, SUCH AS ENTERPRISE NETWORKS AND THE INTERNET.

THE MOST COMMON HIERARCHICAL NETWORK DESIGN IS THE THREE-LAYER MODEL, WHICH CONSISTS OF THE FOLLOWING LAYERS:

CORE LAYER:

THE CORE LAYER IS THE BACKBONE OF THE NETWORK AND PROVIDES HIGH-SPEED CONNECTIVITY BETWEEN THE OTHER LAYERS. IT IS TYPICALLY MADE UP OF HIGH-PERFORMANCE SWITCHES AND ROUTERS.

DISTRIBUTION LAYER:

THE DISTRIBUTION LAYER CONNECTS THE CORE LAYER TO THE ACCESS LAYER. IT PROVIDES ROUTING AND SWITCHING SERVICES, AS WELL AS SECURITY AND OTHER NETWORK SERVICES.

ACCESS LAYER:

THE ACCESS LAYER PROVIDES CONNECTIVITY TO END DEVICES, SUCH AS COMPUTERS, PRINTERS, AND SERVERS. IT IS TYPICALLY MADE UP OF SWITCHES.

HIERARCHICAL NETWORKS OFFER A NUMBER OF ADVANTAGES OVER FLAT NETWORKS, INCLUDING:

SCALABILITY:

HIERARCHICAL NETWORKS ARE MORE SCALABLE THAN FLAT NETWORKS, MEANING THEY CAN BE EASILY EXPANDED TO ACCOMMODATE MORE DEVICES AND USERS.

PERFORMANCE:

HIERARCHICAL NETWORKS CAN PROVIDE BETTER PERFORMANCE THAN FLAT NETWORKS BY REDUCING CONGESTION AND IMPROVING TRAFFIC FLOW.

SECURITY:

HIERARCHICAL NETWORKS CAN BE MORE SECURE THAN FLAT NETWORKS BY ISOLATING DIFFERENT PARTS OF THE NETWORK AND IMPLEMENTING SECURITY POLICIES AT EACH LAYER.

MANAGEABILITY:

HIERARCHICAL NETWORKS ARE EASIER TO MANAGE THAN FLAT NETWORKS BECAUSE THEY ARE DIVIDED INTO SMALLER, MORE MANAGEABLE PARTS.

HERE ARE SOME EXAMPLES OF HIERARCHICAL NETWORKS:

A CORPORATE NETWORK WITH A CORE LAYER OF HIGH-PERFORMANCE SWITCHES, A DISTRIBUTION LAYER OF ROUTERS AND SWITCHES, AND AN ACCESS LAYER OF SWITCHES THAT CONNECT TO EMPLOYEE WORKSTATIONS AND PRINTERS.

A UNIVERSITY NETWORK WITH A CORE LAYER OF HIGH-PERFORMANCE SWITCHES, A DISTRIBUTION LAYER OF ROUTERS AND SWITCHES, AND AN ACCESS LAYER OF SWITCHES THAT CONNECT TO STUDENT AND FACULTY WORKSTATIONS, PRINTERS, AND OTHER DEVICES.

A HOSPITAL NETWORK WITH A CORE LAYER OF HIGH-PERFORMANCE SWITCHES, A DISTRIBUTION LAYER OF ROUTERS AND SWITCHES, AND AN ACCESS LAYER OF SWITCHES THAT CONNECT TO PATIENT MONITORING EQUIPMENT, MEDICAL DEVICES, AND OTHER DEVICES.

________________




__________




___________

Comments

Post a Comment

Popular posts from this blog

TCP/IP MODEL

  HISTORY OF TCP/IP MODEL THE TCP/IP MODEL WAS DEVELOPED BY VINT CERF AND BOB KAHN IN THE 1970S. THEY WERE BOTH WORKING AT THE DEFENSE ADVANCED RESEARCH PROJECTS AGENCY (DARPA) AT THE TIME. Vint Cerf And Bob Kahn CERF AND KAHN WERE TASKED WITH DEVELOPING A NEW NETWORK PROTOCOL THAT WOULD BE MORE RELIABLE AND EFFICIENT THAN THE EXISTING PROTOCOLS. THEY CAME UP WITH THE IDEA OF USING A LAYERED APPROACH, WHICH WOULD ALLOW EACH LAYER TO FOCUS ON A SPECIFIC TASK. THIS LED TO THE DEVELOPMENT OF THE TCP/IP MODEL, WHICH IS STILL THE BASIS FOR HOW DATA IS TRANSMITTED OVER THE INTERNET TODAY. CERF AND KAHN ARE OFTEN REFERRED TO AS THE "FATHERS OF THE INTERNET" FOR THEIR WORK ON THE TCP/IP MODEL. THEY WERE INDUCTED INTO THE NATIONAL INVENTORS HALL OF FAME IN 2004 FOR THEIR CONTRIBUTIONS TO THE DEVELOPMENT OF THE INTERNET. HERE ARE SOME OTHER NOTABLE PEOPLE WHO CONTRIBUTED TO THE DEVELOPMENT OF THE TCP/IP MODEL: JON POSTEL: POSTEL WAS THE FIRST CHAIRMAN OF THE INTERNET ENGINEERI...
Post a Comment
Read more

Types Of Attack in Network

Common Network Attacks Explained. 1. Overwhelming a Network (DoS/DDoS): Imagine a restaurant that's flooded with too many customers. In a DoS/DDoS attack: A website is overwhelmed with too much traffic. 2. Eavesdropping on Conversations (MitM): Imagine someone listening in on your phone call. In a MitM attack: An attacker listens to your online conversations. 3. Tricking You (Phishing): Imagine receiving a fake email from your bank. In phishing: Attackers try to trick you into giving them your personal information. 4. Finding a Weakness in a Website (SQL Injection): Imagine finding a hole in a fence. In an SQL injection attack: An attacker finds a weakness in a website to steal or change data. 5. Planting a Hidden Camera (XSS): Imagine someone hiding a camera in a party. In an XSS attack: An attacker hides harmful code on a website to spy on you. 6. Guessing Your Password (Password Attck): Imagine trying to guess a friend's password. In a pas...
Post a Comment
Read more

OSI Refrance Model

OSI MODEL 1. THE OSI MODEL WAS DEVELOPED BY THE INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO) IN THE LATE 1970S. THE MAIN ARCHITECT OF THE OSI MODEL WAS HUBERT ZIMMERMANN, A FRENCH SOFTWARE ENGINEER. 2.  ISO REPRESENT A 1947 MORE THAN WORK AND AGAIN REPRESENTS A ISO IN 1977 AND MORE THAN WORK AN REPRESENT  IN 1983 A OSI REDFRENCE MODEL. 2. HIS MODEL REPRESENT A 7 LAYER 3. OSI MEANS  (OPEN SYSTEMS INTERCOMMUNICATIO). 1. APPLICATION LAYER 1. THE APPLICATION LAYER IS USED BY END-USER SOFTWARE SUCH AS WEB BROWSERS AND EMAIL CLIENTS.  IT PROVIDES PROTOCOLS THAT ALLOW SOFTWARE TO SEND AND RECEIVE INFORMATION AND PRESENT MEANINGFUL DATA TO USERS. 2.  IT SENDS ITS DATA TO THE FORM OF THE  PDU. PROTOCLS  AND DEVICES USED IN LAYER THERE ARE SOME PROTOCOLS THAT WORK AT THE BACKEND OF THE APPLICATION LAYER. WHICH IN TURN WORKS AT THE APPLICATION LAYER. MANY DEVICES USE IT AT THE APPLICATION LAYER. PROTOCOLS FTP  (FILE TRANSOFER PROTOCOL) DNS (DOMA...
Post a Comment
Read more