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Home > Archive > alt.certification.network-plus > September 2002 > firewall question
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| Bob Rawlins 2002-09-19, 8:29 pm |
| Some of you may have come across the following question in a practice exam. I
don't understand it. The correct answer is "Gateway," meaning that the others
are types of firewalls, but I don't understand the premise. What is the
Circuit Level? Is the question referring to the OSI model or what?
Which of the following is not a type of firewall?
Gateway Level
Network Level
Circuit Level
Application Level
None of the Above
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| Russ S 2002-09-19, 8:29 pm |
| Hey Bob
First off - I have never seen a question quite like that on any practice
tests that I used or on the exam proper. The terms used are not what you
will see featured.
There are two types of firewall - software and hardware. I dont lnow if I
really want to get too technical, but a Gateway Router (hardware) works at
the Network Layer and a Software firewall works at the Application Layer.
A Gateway Router can feature NAT or Port Filtering.
It can also be said that a Gateway can work on the Transportation, Session,
Presentation and Application layers, so to answer your question I would say
Circuit Level is the odd one out.
Hope that helps and didn't confuse you too much.
RussS
A+, Net+
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| Russ S 2002-09-19, 9:29 pm |
| Hey Bob
First off - I have never seen a question quite like that on any practice
tests that I used or on the exam proper. The terms used are not what you
will see featured.
There are two types of firewall - software and hardware. I dont lnow if I
really want to get too technical, but a Gateway Router (hardware) works at
the Network Layer and a Software firewall works at the Application Layer.
A Gateway Router can feature NAT or Port Filtering.
It can also be said that a Gateway can work on the Transportation, Session,
Presentation and Application layers, so to answer your question I would say
Circuit Level is the odd one out.
Hope that helps and didn't confuse you too much.
RussS
A+, Net+
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| Bob Rawlins 2002-09-20, 7:28 pm |
| Excellent! Thanks Russ.
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| Chris E 2002-09-20, 7:28 pm |
| A circuit level firewall validates the protocol sessions before opening the
connection through the firewall.
An application-level firewall checks packets for data at the application
layer before allowing a connection.
I've never heard of a network-level, but I assume that network-level and
packet-filter firewalls are one and the same. Packet-filter is the least
secure firewall method. It requires that a packet match a rule to gain
access to a network.
this information is from notes that I have taken, so take it for what it's
worth. I hope it helps.
Chris
A+
"Bob Rawlins" <rcr1632@aol.com> wrote in message
news:20020919211438.03343.00004324@mb-ck.aol.com...
> Some of you may have come across the following question in a practice
exam. I
> don't understand it. The correct answer is "Gateway," meaning that the
others
> are types of firewalls, but I don't understand the premise. What is the
> Circuit Level? Is the question referring to the OSI model or what?
>
> Which of the following is not a type of firewall?
> Gateway Level
> Network Level
> Circuit Level
> Application Level
> None of the Above
>
>
>
| |
| Bob Rawlins 2002-09-20, 8:29 pm |
| Excellent! Thanks Russ.
| |
| Chris E 2002-09-20, 8:29 pm |
| A circuit level firewall validates the protocol sessions before opening the
connection through the firewall.
An application-level firewall checks packets for data at the application
layer before allowing a connection.
I've never heard of a network-level, but I assume that network-level and
packet-filter firewalls are one and the same. Packet-filter is the least
secure firewall method. It requires that a packet match a rule to gain
access to a network.
this information is from notes that I have taken, so take it for what it's
worth. I hope it helps.
Chris
A+
"Bob Rawlins" <rcr1632@aol.com> wrote in message
news:20020919211438.03343.00004324@mb-ck.aol.com...
> Some of you may have come across the following question in a practice
exam. I
> don't understand it. The correct answer is "Gateway," meaning that the
others
> are types of firewalls, but I don't understand the premise. What is the
> Circuit Level? Is the question referring to the OSI model or what?
>
> Which of the following is not a type of firewall?
> Gateway Level
> Network Level
> Circuit Level
> Application Level
> None of the Above
>
>
>
| |
| Russ S 2002-09-20, 8:29 pm |
| Hi Chris
By Network level etc I am refering to where it is on the OSI Seven Layer
model. The tests are very weighted to that principal no matter that it is
not practiced in reality. Circuit level is a term that I have never come
across except in reference to technical wiring diagrams.
RussS
A+, Net+
| |
| Russ S 2002-09-20, 9:29 pm |
| Hi Chris
By Network level etc I am refering to where it is on the OSI Seven Layer
model. The tests are very weighted to that principal no matter that it is
not practiced in reality. Circuit level is a term that I have never come
across except in reference to technical wiring diagrams.
RussS
A+, Net+
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