Dr. Atiq Ahmed. Network. Management. Introduction. Management. OSI Key Areas of Network Management 1/27. Dr. Atiq Ahmed. Network Management

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1 Course Outline Course Structure Credit Hours: 3 (3, 0) Prerequisites: Computer Communication and s Evolution in Architectures Evolution of Protocols Evolution in Functions in Department of Computer Science & Information Technology University of Balochistan Lecture 01 1/27 2/27 Course Outline Reference/Text Books Theories and for Policy-Based Artificial Intelligence Graph-Theoretic Probabilistic Approaches Web-Based Agent Distributed Object Computing Active Technology Bio-inspired Approaches XML in 1 Computer s and Internets: International Version: With Internet Applications by Douglas E. Comer 2 : Principles and Practices by Mani Subramaniam 3, MIBs and MPLS: Principles, Design and Implementation by Stephen B. Morris 4 Fundamentals by Alexander Clemm 3/27 4/27

2 Course Material Outline Available on Office Hours Tuesday 09:30-12:00 Wednesday 10:30-12:30 5/27 6/27 Defined Defined The execution of the set of functions required for Controlling Planning Allocating Deploying Coordinating and Monitoring the resources of a telecommunications network or a computer network Note All measures ensuring the effective and efficient operations of a system within its resources in accordance with corporate goals To achieve this, network management is tasked with: Controlling network resources Coordinating network services Monitoring network states Reporting network status and anomalies Generally, network management does not include user terminal equipment!!! 8/27 9/27

3 Defined I Defined II The activities, methods, procedures, and tools that refer to the 1 Operation Also monitoring the network to spot problems ASAP before users are affected 2 3 Maintenance also involves corrective and preventive measures to make the managed network run "better", such as adjusting device configuration parameters 4 Administration Maintenance Performing repairs and upgrades e.g., when equipment must be replaced, when a router needs a patch for an operating system image Deals with keeping the network and the services up and running smoothly Provisioning of networked systems Configuring resources in the network to support a given service Deals with keeping track of resources in the network and how they are assigned Also all the "housekeeping" that is necessary to keep the network under control 10/27 11/27 critical to running of business Complexity of network requiring automated management tools Large number of devices, increased probability of device failure Likelihood of devices from different manufacturers Physical distribution of network assets requiring management of assets across the network itself 12/27 Fault Correcting a work-stopping fault and resuming normal service with the minimum of delay Steps to Follow Determine location of fault Isolate rest of network from failure Reconfigure network to operate efficiently without failed components Rectify fault, reconnect components, reconfigure network again 14/27

4 Accounting Charging cost of providing network to departments or cost centers based on usage statistics Reasons User(s) may overburden network at expense of other users User(s) making inefficient use of network can be targeted by network manager to change procedures are improve performance manager can plan for network growth if user activity is known Configuration and Name Deciding how a device is to be used, choosing appropriate software and settings for the device Concerned with Initializing a network Gracefully shutting down all or part of a network Maintaining, adding, updating relationships between components Status of components during network operation 15/27 16/27 Performance Identifying deteriorating response or throughput of the network and introducing additional equipment / transmission-capacity to improve the problem Performance issues What is the level of capacity utilisation? Is there excessive traffic? Has throughput reduced unacceptably? Are there bottlenecks? Is response time increasing? 17/27 Security Monitoring and controlling access to computer networks Concerned with generation, distributing and storing encryption keys, passwords and other access control information Requires use of security logs and audit records 18/27

5 Sub-area of Configuration and Name Layer Most of the protocols associated with the TCP/IP suite have associated operational parameters, e.g., IP s TTL parameter and TCP s retransmission timer As a network expands, such parameters may need to be changed while the network is still operational Connection Monitoring Ping a number of critical IP addresses at intervals Inefficient, and not very informative, should only be used if no alternative Traffic Monitoring Analyze traffic on a network and generate reports MS Monitor / Fluke Analyzer Works on a single segment at a time More sophisticated tools use SP/CIMP to remotely monitor other segments 19/27 21/27 Simple Protocol Released by US Department of Defense and TCP/IP developers in 1988 Most widely used and well-known in network software management tools Common Information Protocol Developed by the ISO, pre-dating SP Not implemented as much as SP, especially since SP became a part of TCP/IP Telecommunications Developed by ITU-T Specifies management architectures for telecommunications networks (e.g. ISDN, B-ISDN, ATM) 22/27 Monitors / Analyzers A network monitor uses SP or CMIP to keep track of statistical information about a network A network analyzer does the same but provides a more sophisticated level of service - for example some network analyzers can not only detect and identify problems, they can fix them as well A network analyzer may be dedicated hardware, but can just be a specialized software package that runs on a typical PC using a typical network card 23/27

6 Monitors Microsoft Monitor Capturing, viewing, analyzing network data & deciphering network protocols Xymon Offers graphical monitoring & listing various services of each machine Paessler Router Traffic Grapher Can monitor & classify bandwidth usage in a network using SP, Packet Sniffing & Netflow Big Brother Tool for systems & network monitoring Nagios Open source computer system monitor, network monitoring & infrastructure monitoring software Analyzers Agilent 85055A kit AC network analyzers Troubleshooting Problems will happen on networks Approach the problem logically and methodically Two useful approaches to network troubleshooting The Process of Elimination Gabriel Kron Divide and Conquer Transient network analyzers 24/27 25/27 Trends Troubleshooting Software Tools Nomadic computing (Mobility) Wireless high-speed networks Ping network layer connectivity Traceroute identifying network layer point of failure Telnet application layer connectivity Netstat protocol statistics / TCP/IP connections ARP show / change ARP cache IPConfig show IP / MAC settings Scalability Security (Trust) Interoperability Context-awareness Autonomic computing Integration Expanded Services... 26/27 27/27

Pervasive and Mobile Computing. Dr. Atiq Ahmed. Introduction Network Definitions Network Technologies Network Functions 1/38

Pervasive and Mobile Computing. Dr. Atiq Ahmed. Introduction Network Definitions Network Technologies Network Functions 1/38 Department of Computer Science & Information Technology University of Balochistan Course Objectives To discuss the fundamental problems in the emerging area of mobile and pervasive computing, along with