CompTIA exam study guide presentations by instructor Brian Ferrill, PACE-IT (Progressive, Accelerated Certifications for Employment in Information Technology) "Funded by the Department of Labor, Employment and Training Administration, Grant #TC-23745-12-60-A-53" Learn more about the PACE-IT Online program: www.edcc.edu/pace-it

1. Network
devices II.

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Instructor, PACE-IT Program – Edmonds Community College
Areas of Expertise Industry Certifications
 PC Hardware
 Network Administration
 IT Project Management
 Network Design
 User Training
 IT Troubleshooting
Qualifications Summary
Education
 M.B.A., IT Management, Western Governor’s University
 B.S., IT Security, Western Governor’s University
Entrepreneur, executive leader, and proven manger
with 10+ years of experience turning complex issues
into efficient and effective solutions.
Strengths include developing and mentoring diverse
workforces, improving processes, analyzing
business needs and creating the solutions
required— with a focus on technology.

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– Firewalls.
– Network attached storage (NAS).
– Other devices.
PACE-IT

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Network devices II.

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– The firewall.
» It can be built into routers or be its own device.
» It functions at multiple layers of the OSI model.
• Specifically at layers 2, 3, 4, and 7.
» It is used to prevent or mitigate security threats.
» It blocks packets from entering or leaving the network.
• Via stateless inspection: the firewall will examine
every packet against a set of rules. Once the packet
matches a rule, the rule is enforced, and the specified
action is taken.
• Via stateful inspection: the firewall will only examine
the state of the connection between networks.
Specifically, when a connection is made from an
internal network to an external network, the firewall will
not examine any packets returning from the external
connection. As a general rule, external connections are
not allowed to be initiated with the internal network.
» It is the first line of defense in protecting the internal
network from outside threats.
• Consider it the police force of the network.
Network devices II.

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Network devices II.

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– The NAS.
» One solution to the data storage needs of the modern world.
• It is a specifically designed pool of storage.
» NAS is usually deployed as a network appliance.
• A network appliance is a device that is purchased and
deployed with a preconfigured operating system and software.
It is designed to perform a specific function and to do that
function very well.
• Network appliances limit the amount of configuration that the
user is allowed to perform.
» NAS offers several storage solution benefits.
• NAS is often designed and deployed with performance in
mind (with some form of RAID striping and multiple
connections to the network, thus increasing the possible
throughput).
• NAS is often designed with high availability in mind (with
some form of RAID mirroring and redundant systems in case
of equipment failure).
• NAS is always designed and deployed with high storage
capacity in mind. The size of the NAS is usually only limited
by the budget of the purchaser.
Network devices II.

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Network devices II.

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– Voice over IP (VoIP) phones.
» Use the network and Internet to provide telephone service.
» Offer more than just normal telephone functions.
• They can automatically log VoIP traffic, they are often
programmed with time clock applications, and they are often
programmed with simple browsers.
» VoIP can reduce the cost of operating telephones.
• Reduced long distance costs.
• Reduced cost of reconfiguration and ease of management of
the system.
– Internet appliances.
» A category of purpose built devices that are designed to
connect to a network and offer simple communication.
• An example would be a device that measures the amount of
material in a tank and, when it reaches a certain level, it will
send a message to reorder the necessary supply.
» They are usually designed to simplify a process or procedure.
Network devices II.

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Network devices II.
They can be built into routers or purpose built. They function at multiple
levels of the OSI model in an effort to mitigate and protect the network from
security threats. They control the flow of traffic into and out of networks.
Topic
Firewalls.
Summary
A mass storage solution for the modern network. NAS is often deployed
with high performance and/or high availability in mind. This is achieved
through the use of RAID and other redundancy built into them. They tend to
be a type of network appliance that is built to achieve a specific purpose.
The size of the storage solution is only limited by the budget for it.
Network attached storage.
VoIP phones offer telephone service over the network and Internet. VoIP
can offer more than just telephone service (logging, time card functions,
and the inclusion of a simple browser are common). VoIP can be used to
reduce the normal cost of telephony. Internet appliances are purpose built
devices that are designed to connect to networks and offer simple
communication.
Other devices.

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THANK YOU!

12. This workforce solution was 100 percent funded by a $3 million grant awarded by the
U.S. Department of Labor's Employment and Training Administration. The solution was
created by the grantee and does not necessarily reflect the official position of the U.S.
Department of Labor. The Department of Labor makes no guarantees, warranties, or
assurances of any kind, express or implied, with respect to such information, including
any information on linked sites and including, but not limited to, accuracy of the
information or its completeness, timeliness, usefulness, adequacy, continued availability
or ownership. Funded by the Department of Labor, Employment and Training
Administration, Grant #TC-23745-12-60-A-53.
PACE-IT is an equal opportunity employer/program and auxiliary aids and services are
available upon request to individuals with disabilities. For those that are hearing
impaired, a video phone is available at the Services for Students with Disabilities (SSD)
office in Mountlake Terrace Hall 159. Check www.edcc.edu/ssd for office hours. Call
425.354.3113 on a video phone for more information about the PACE-IT program. For
any additional special accommodations needed, call the SSD office at 425.640.1814.
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