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Network Problems and
Solutions
M. Sc. Juan Carlos Olivares Rojas
[email protected]
[email protected]
http://antares.itmorelia.edu.mx/~jcolivar/
Outline
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Preventive Measures
Diagnostic
Monitoring
Main Problems
Error Solutions
Computer Network Performance
Computer Network Accountants
Maintenace
Recovering
Security
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
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.
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.
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.
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
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).
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.
Monitoring
• The isn’t a unique tool who monitor all services
in a Network, this depend of the service such
as:
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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
Main Problems
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There isn’t a Network Connection
There isn’t an Internet Connection
The Wireless Network disconnect frecuently
How can we shared an Internet Connection?
The computer is connected but it can’t see the
other or the other computers can’t see that
computer
• Some Network Applications don’t run and
others runs correctly
Error Solutions
• Explain how can you to solve the problems
listed in the past slide?
Computer Network Performance
• Computer Network Performance is the result to
monitoring and solving all the events ocurred in
a Network.
• It’s an optimization process to guaranted
Quality of All Network Services provide in the
Network.
• The Network Performance also include the
correct admnistration of users.
Computer Network Accountants
• It’s a very important process which consists in
registred all the users’ activities in a Network.
• It’s crucial to know what users are doing.
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.
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.
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.
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).
Exam 3
• Installation, administration and presentation of
one Network Service, for example:
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Snort
MRTG
Nagios
GZIP HTTP Compression
Squid
Instant Messenger Service (Jabber)
Groupware
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)
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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