Network and Security- Foundations- D315 Exam Questions And Answers
TCP/IP
Transmission Control Protocol/Internet Protocol
Application Layer
This layer is responsible for the communication protocols between nodes. The protocols in this layer include hypertext transfer protocol (HTTP and H...
Network
and
Security-
Foundations-
D315
TCP/IP
Transmission
Control
Protocol/Internet
Protocol
Application
Layer
This
layer
is
responsible
for
the
communication
protocols
between
nodes.
The
protocols
in
this
layer
include
hypertext
transfer
protocol
(HTTP
and
HTTPS),
Secure
Shell
(SSH),
and
network
time
protocol
(NTP),
among
many
others.
Transport
Layer
This
layer
is
responsible
for
the
end-to-end
transport
of
data.
The
protocols
that
live
in
this
layer
are
transmission
control
protocol
(TCP)
and
user
datagram
protocol
(UDP).
Network
Layer
This
layer
defines
the
logical
transmission
protocols
for
the
whole
network.
The
main
protocols
that
live
in
this
layer
are
internet
protocol
(IP),
internet
control
message
protocol
(ICMP),
and
address
resolution
protocol
(ARP).
Network
interface
Layer
This
layer
establishes
how
data
should
be
physically
sent
through
the
network.
OSI
Model
Open
Systems
Interconnection
Model
Physical
Layer
(Layer
1)
This
layer
is
responsible
for
the
physical
connections
of
the
devices
in
the
network.
This
layer
is
implemented
through
the
use
of
devices
such
as
hubs,
repeaters,
modem
devices,
and
physical
cabling.
Data
Link
Layer
(Layer
2) This
layer
is
responsible
for
the
error-free
delivery
of
data
to
the
receiving
device
or
node.
This
layer
is
implemented
through
the
use
of
devices
such
as
switches
and
bridge
devices,
as
well
as
anything
with
a
network
interface,
like
wireless
or
wired
network
cards.
Network
Layer
(Layer
3)
This
layer
is
responsible
for
the
transmission
of
data
between
hosts
in
different
networks
as
well
as
routing
of
data
packets.
This
layer
is
implemented
through
the
use
of
devices
such
as
routers
and
some
switches.
Transport
layer
(layer
4)
In
this
layer
protocols
ensure
that
data
are
transferred
from
point
A
to
point
B
reliably
and
without
errors.
this
layer
services
include
flow
control,
acknowledgment,
error
correction,
segmentation,
reassembly,
and
sequencing.
Session
Layer
(Layer
5)
This
layer
is
responsible
for
connection
establishment,
session
maintenance,
and
authentication.
Presentation
Layer
(Layer
6)
This
layer
is
responsible
for
translating
data
from
the
application
layer
into
the
format
required
to
transmit
the
data
over
the
network
as
well
as
encrypting
the
data
for
security
if
encryption
is
used.
Application
Layer
(Layer
7)
This
layer
is
responsible
for
network
applications
(like
HTTP
or
FTP)
and
their
production
of
data
to
be
transferred
over
the
network.
Hub
{Physical
Layer}
-The
simplest
device
used
on
an
Ethernet
network
for
connecting
devices
to
each
other
-split
the
bandwidth
of
a
connection
among
all
the
computers
connected
to
it
-
do
not
perform
any
packet
filtering
or
addressing
functions
but
instead
broadcast
data
to
all
computers
connected
to
it
Switch
{Data
and
Network
Layer}
-Provides
connectivity
to
devices
in
a
local
network -Creates
a
dedicated
full-speed
connection
between
two
computers
that
are
communicating
with
each
other
-
makes
use
of
the
MAC
address
to
deliver
the
message
to
the
right
destination
Router{Network
Layer}
-Interconnect
two
or
more
networks
-Operate
at
the
border
of
your
network
-Stores
information
about
the
systems
that
are
connected
to
it
and
where
to
send
requests
when
the
destination
is
unknown
-Works
at
the
network
layer
of
the
OSI
model
Wireless
Access
point
{WAP}
-Extends
a
wired
network
to
wireless
connections
-Involves
the
IEEE
802.11
group
of
standards
that
defines
wireless
LAN's
{WLAN's}
-Central
connecting
point
for
computers
equipped
with
wireless
network
adapters
-
identifies
each
computer
by
its
MAC
address
Patch
Panel
-A
box
designed
as
a
junction
point
for
twisted
pair
(TP)
cable
and
fiber
cable
used
in
networks.
-First
step
in
organizing
your
cables
Firewall
-A
security
hardware
appliance
or
software
application
that
protects
a
computer
or
network
from
unwanted
intrusion
-Blocks
unwanted
connections
from
untrusted
networks
and
can
block
basic
network
attacks
Modem
{Physical
and
Data
link
Layer}
-Connects
a
LAN
to
an
internet
service
provider
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