If an external router filters traffic before it enters the network and another screening device monitors traffic before it enters the internal network, what type of architecture is this?
A.
Screened host
B.
Screened subnet
C.
Dual-homed firewall
D.
Dual subnets
Explanation:
A screened subnet filters external traffic and passes it on to the
firewall (the second screening device) and then on to the internal network. A
screened subnet creates a DMZ by using two routers or firewalls. A screened host is
a screening router that is in front of a firewall, but does not create a DMZ.
This is the exact definition of a screened host. the answer should be a.
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Nikpoor is totally right. A screened host has two devices and is referred to as a single-tiered firewall configuration. The outer-router is the screening device and the firewall is the screened host. A screened subnet has three devices and is referred to as a two-tiered configuration. The outer-router is the screening device followed by two firewalls: an external and internal firewall. The zone between these two firewalls is in fact the screened subnet. The question mentions two devices, so we are talking about a screened host. Answer A is the correct answer. The text in the explanation box does not make sense.
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B is the correct answer because the traffic is finally entering a network not a single machine.
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It also asks what “Architecture”, no such thing as a “screened HOST architecture”. Just saying.
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B
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