Network Problems and Solutions

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Network Problems and Solutions

• M. Sc. Juan Carlos Olivares Rojas

juancarlosolivares_at_hotmail.com jcolivar_at_itmorelia.
edu.mx http//antares.itmorelia.edu.mx/jcolivar/
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Outline

• Preventive Measures
• Diagnostic
• Monitoring
• Main Problems
• Error Solutions
• Computer Network Performance
• Computer Network Accountants
• Maintenace
• Recovering
• Security

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Objectives

• To know the principal Network Problems and To
  Solution these problems.
• Competences
• Diagnostic and Monitoring Services in a Network.
• Maintaining and Performing Services and Resources
  over a Network
• Securizing and Virtualizing Services

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Preventive Measures

• The most important thing in an Network is the
  Network Management.
• Network Management include the definition of
  measures to aim to improve the correct function
  of the Network.
• One of the most important Network Measure is the
  Network speed (Bandwith utilization), other is
  related with Security, etc.

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Diagnostic

• Diagnostic is the First Process to detect and
  solve Network Problems.
• Exits some Network Diagnostic Tools for
  automatizing the detection of Network Problems.
• Actually, most of the recently OS have Network
  Diagnostic Tools to improve and solve problems
  with the Network.

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Monitoring

• The term network monitoring describes the use of
  a system that constantly monitors a computer
  network for slow or failing components and that
  notifies the network administrator in case of
  outages via email, pager or other alarms.
• It is a subset of the functions involved in
  network management.

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Monitoring

• Network Monitor Tools make a serie of services
  such as
• Analyze protocols such as HTTP, FTP, DNS, among
  other detecting problems and cheking their
  performance.
• They realize a network tomography and notify all
  events defined in the configuration process

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Monitoring

• Most of the implementation of Network Monitors
  used the Simple Network Management Protocol
  (SNMP) for Obtaining the features of a Node in a
  Network.
• Simple Network Management Protocol (SNMP) is used
  in network management systems to monitor
  network-attached devices for conditions that
  warrant administrative attention. SNMP is a
  component of the Internet Protocol Suite as
  defined by the Internet Engineering Task Force
  (IETF).

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Monitoring

• It consists of a set of standards for network
  management, including an application layer
  protocol, a database schema, and a set of data
  objects.
• SNMP exposes management data in the form of
  variables on the managed systems, which describe
  the system configuration. These variables can
  then be queried (and sometimes set) by managing
  applications.

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Monitoring

• The isnt a unique tool who monitor all services
  in a Network, this depend of the service such as
• WebSense/Squid for Web
• IDS (Intrusion Detection Systems) such Snort
• Firewall (IPS Intrusion Preventing Systems)
• Bandwith utilization such as MRTG, Nagios
• Sniffers WireShark, Nmap, Ntop

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Main Problems

• There isnt a Network Connection
• There isnt an Internet Connection
• The Wireless Network disconnect frecuently
• How can we shared an Internet Connection?
• The computer is connected but it cant see the
  other or the other computers cant see that
  computer
• Some Network Applications dont run and others
  runs correctly

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Error Solutions

• Explain how can you to solve the problems listed
  in the past slide?

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Computer Network Performance

• Computer Network Performance is the result to
  monitoring and solving all the events ocurred in
  a Network.
• Its an optimization process to guaranted Quality
  of All Network Services provide in the Network.
• The Network Performance also include the correct
  admnistration of users.

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Computer Network Accountants

• Its a very important process which consists in
  registred all the users activities in a Network.
  
• Its crucial to know what users are doing.

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Maintenace

• Network Maintenace is the process to improve the
  network services for controlling the Network
  performance.
• Exist three types of maintenace preventive,
  corrective and performance.

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Recovering

• Recovering is a process to return the
  configuration, information and executing services
  when a server was failed for diverse reason such
  as virus, attacks an other security incidentes.

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Security

• Network security consists of the provisions made
  in an underlying computer network infrastructure,
  policies adopted by the network administrator to
  protect the network and the network-accessible
  resources from unauthorized access, and
  consistent and continuous monitoring and
  measurement of its effectiveness (or lack)
  combined together.

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Security

• The terms network security and information
  security are often used interchangeably, however
  network security is generally taken as providing
  protection at the boundaries of an organization,
  keeping the intruders (e.g. black hat hackers,
  script kiddies, Trudy, etc.) out. Network
  security systems today are mostly effective, so
  the focus has shifted to protecting resources
  from attack or simple mistakes by people inside
  the organization, e.g. with Digital Leak
  Protection (DLP).

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Exam 3

• Installation, administration and presentation of
  one Network Service, for example
• Snort
• MRTG
• Nagios
• GZIP HTTP Compression
• Squid
• Instant Messenger Service (Jabber)
• Groupware

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Exam 3

• Exam Guidelines
• 10 slides maximus
• Software Demonstration (video presentation is
  suggested)
• Questions of classmates and professor
• Extrapoint for new services (not widely used)

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References

• Forouzan, B. (2008), Data Comunications and
  Networking, 4th. Edition, McGraw-Hill.
• Tanenbaum, A (2004). Computer Networks. 4th
  Edition. Prentice Hall.
• Kurose, J. and Ross, K. (2007) Computer
  Networking A Top Down Approach 4th edition.
  Addison-Wesley, July 2007.

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Preguntas?