7 SR 3 Unit 6 Computer Network Internet

7 SR 3: Unit 6 Computer Network & Internet UNIT-VI: Network Management: Basic principals, Infrastructure 4 n/w management, The internet Network management framework: SMI, MIB, SNMP details, Security & administration, ASN. 1, Firewalls: Packet filtering and application Gateways CNI Unit-6 1

What is Network Management? Why it is needed? "Network management includes the deployment, integration and coordination of the hardware, software, and human elements to monitor, test, poll, configure, analyze, evaluate, and control the network and element resources to meet the real-time, operational performance, and Quality of Service requirements at a reasonable cost. " CNI Unit-6 2

Simple Network Management Protocol: 1. SNMP is a framework for managing devices in an internet using the TCP/IP protocol suit 2. It provides a set of fundamental operations for monitoring and maintaining an internet 3. It uses the concept of manager and agent (Manager: Usually a host – which controls and monitors a set of agents e. g. Routers, Switches… etc) 4. SNMP is an Application Level Protocol, so that it can monitor devices made by different manufacturers and which may be installed on different physical networks CNI Unit-6 3

Managers and Agents: A management station is called a Manager, It is a host system, that runs the SNMP client program (? telnet c/s) A managed station is called as an Agent, It can be a router/ modem/ switch system, that runs the SNMP server program (? Demo of Layer 3 switch!. . ) • The management is achieved through the simple interaction between manager and the agent. • Agent keeps the performance information in a database • Management with SNMP protocol is based on 3 basic Ideas CNI Unit-6 4

HOW MANAGEMENT IS DONE? (By SNMP M/C’sm) • • • The management is achieved through the simple interaction between manager and the agent. Agent keeps the performance information in a database Management with SNMP protocol is based on 3 basic Ideas (1) Manager(C) checks an Agent(S) by requesting information that reflects the behavior of the agent (2) The Manager(C) forces the Agent(S) to perform a task by resetting values in the Agent(S) Data Base (DNS Database …. . Concept of ? ? ) (3) The Agent(S) can also contribute to the management (The Server program running on the Agent can check the process. environment and if, it notices something unusual it can send a warning message called TRAP to the manager(C)) CNI Unit-6 5

HOW MANAGEMENT IS DONE? (By SNMP M/C’sm) To Do Management Task SNMP uses TWO protocols: § SMI Structure of Management Information § MIB Management Information Base Role Of SNMP: • SNMP defines the format of the packet to be sent from a manager to an Agent(S) and vice versa. • It also interprets the results and creates the statistics. • The packets exchanged contain the object (Variable) names and their status (Values) • SNMP is responsible for reading and changing these values CNI Unit-6 6

HOW MANAGEMENT IS DONE? (By SNMP M/C’sm) To Do Management Task SNMP uses TWO protocols: § SMI Structure of Management Information § MIB Management Information Base Role Of SMI: • To use SNMP we need rules for naming the objects. • The Objects in SNMP forms the hierarchical structure, • Part of name is inherited from the parent, • SMI defines the general rules for naming the objects, (Includes the name & range) How to encode objects & values • Defines number of object the entities should manage CNI Unit-6 7

HOW MANAGEMENT IS DONE? (By SNMP M/C’sm) To Do Management Task SNMP uses TWO protocols: § SMI Structure of Management Information § MIB Management Information Base Role Of MIB: • Creates the a collection of objects, their types and their relationships to each other in an entity to be managed. • It’s similar to writing a program, How task is handled by SMI • Tasks have actions to be performed CNI Unit-6 8