Hi and welcome to the Deep dive into
Network, assessments by ec-council. This
is Section 1 introduction to
network. Security Assessments in this
video, will take a look at exploring various Network Services
and the associated port number. So
let's iPhone in there are
many Network protocols. And these Network Protocols
are simply the underlying technology which
he finds whole, a source such as
send a device package and format a
message to be sent across to the intended
destination order. Sabean Network protocols
as simply what we can call the
rules, which describes how devices will
form an address information. Simile
to sending a letter fire, your
local Postal Service.
For each Network, protocol is usually an
Associated logic Network. Port number
or a logical part. Number sample since Mike
Wallace is service port numbers. Well, they probably
wondering what exactly is a
port number. A phone number is simply do
away, which is you swallow eater outbound or
even inbound traffic to, and from insist on
all devices that contains TCP
IP has a tooth out of 65535.
These Sports akasa Grace into three
categories. From, let's
say 1 to 1023 at what
we call the well-known for its example of
a well-known for what is hdp, which uses for
tea for 10:24 to
49151 at
what we Define as register reports on
4th, which is
range from 49152 to
65535 Port,
which range from 49152 to
65535 at
what we called dynamic or even
private parts. This ports are open temporary to
send data and receive D20 system. So, let's
take a look at it, a gram.
On one side. We have a client on the
other side. You have a web server. Since. Silver
is running. Let's see some type of
way about the creation and if it is using HTTP, then
Port 443, will you open open to
web browser on a PC? It will
connect to. Destination for Twitches. 443a,, Nestle
protocol is known as secure shell or
better known as SSH, ssh protocol, which
provides data encryption. It's simply
allows a user to securely access. A remote
system across the network and SSH
uses for 22 by
default.
Another,. That's what protocol is known as
tell. Matt. Tell Matt. It's a little bit like,
as a Siege, however, telnet is an unsecured protocol,
which means it does not provide any sort
of data encryption allows a
user to access a remote system, a crossing at
work. But remember the connection is not secure
which means to see a transaxle can simply intercept
your data and see your messages, which
I going across the net to keep in mind telling
that uses for 23 by default. Another, Network
protocol is a domain name system for to call Hill
better known as DNS. Simply allows
a device to resolve hostname to IP
address and DNS servers operation
Port 53 by default.
So, imagine if you want to visit a website,
you need to know the IP address of the website. However,
if you know, who's named your
system can use a hostname attempt to resolve.
What actual IP address is for the
destination web server and said DNS is
very popular with an internet and even
own private and internal Networks.
So, the DNS UVA contains many records on
these records. Helps us identify who sing
to IP address and vice-versa in this
diagram. We can see you. So, who is
Aditi? See, who wants to visit Lexi www.cisco.com? But
doesn't know what IP address to PC Wilson.
A DNS query. To the DNS server.
DNS UVA will check its record to
determine the IP address for www.cisco.com and
returned back to the PC. When it
BC received a response from the DS silver.
It will then connect to the IP address as shown in
the diagram. The file transfer protocol sdp is
pretty much. Would a name says, it's a
network protocol which allows file transfers between a device
which has an FTP client and a
device which runs on FTP server is it
doesn't provide any
sort of data encryption. So any data
Exchange between FTP server and client
is actually on encrypted.
When using FTP, SCP operation to reports
one, for which is for 20s
user data transfers while poor 21 is
used to control between the client on the silver. In this
diagram. We can see the FTP client
on FTP server, the classless and control instructions
to the silver requesting citizen files while
the file transfer itself takes place over
on the report.
The most accurate version of FTP is known
as SFTP or better known
as SSH file transfer protocol
with SFTP. The clients
simply establishes on SSC session between
the client and FTP server.
When using SFTP, it simply allows
all the FTP messages to be sent across the
SSH. Tunnel between devices. We're using
SSH auction kripo, FTP traffic
and because it is using as a CH do silver
operates on 422 by default as shown
in the diagram dies on FTP client on
the PC. And there's an FTP server running order
the device. However, the connection is being
sent across an SSH tunnel and as for
22 open on the FTP server.
There's another switch off FTP on
this was the last spps or better known as
file transfer protocol, secure, when using ftps. This
version uses secure sockets. Layer
SSL to provide data encryption for
FTP messages as the exchange between
a client and server.
As shown in the diagram, we have the two
devices on FTP client. I don't have
to be silver. However, since ftps uses
as a cell then Port 443
will be open on the silver device.
Lastly we even have one
more of your son off FTP. This one is
known as trivial file transfer protocol and tftp
operates on 469 using tftp
is commonly use with the networking industry
and even systems administrators. They use
tftp to actually quickly upload
and download files between their PCS
Outlet. Citadel our tops and networking devices.
These files could be configuration
files or even device. Operating systems
are shown in the diagram deserti FTP
client on an 80 ft piece, silver, any device
and it's running. 80 ft
be silver. It will have both 69 who won
by default. We can't forget about in your protocols.
This tree mini Miracles. There's
SMTP simple meal transfer protocol, which
is used for sending Albany.
Between systems and Elizabeth has
a default Port of Port twenty-five. However, if
you want to retrieve emails, POP3 that's
on hospice office, protocol 3 on Pottery,
simply operates on Port 110.
And it says you should download the emails from
being a server on today in your client. However, if
you want to synchronize, the emails between a
new client ID new server, then you
should use a mouthful, which is in that message, access
protocol for and you sing. I'm up for it operates
on Port 143 by default. As shown
in this a gram. We have multiple systems, which are
sending emails and retrieving emails, once
was sending news.
SMTP is a protocol has use for
Sunday, Albany Mills. However, if
you want to synchronize or email between the email server
and let's an email client, then you need to use.
I'm a fool, but if you want to download the emails
from the server on to the client, then you
should use pop. Tree is very common Network.
Protocol is known as a dynamic hose configuration protocol
which allows
a day to be civil to automatically distributed
IP addresses to climb devices, which
are associated with this can be on
wired and wireless networks. When using did
CP it uses two ports. The DHCP client
will use port 68. While
the dacc, if I use a sport 67, by
default in this diagram, we can see the
DT before we handshake, which takes place between
client, and it should be silver. This occurs
whenever
A client connect to a network for the first time, it will
sign it discover. The silver will respond
with an offer. The client will then respond without a
request, an acknowledgement
back to the client. There's also
HTTP https HTTP to
hypertext transfer protocol is simply
an unsecured protocol with fellows. Let's see,
a web browser to communicate with a web application or a
web server when using HTTP to default
Port Authority. While HTTP
provides data encryption because it
uses SSL on notice. It uses
the transport layer of security. When using HTTP,
the web application server will
use port 443 by default. Having complete
this with you, you have discovered, Network, Protocols.
Are there Services. You have also Learn
To Rule and function of various Network Services.
In the next video will take a look at
exploring Network. Enumeration a scanning
techniques. I hope this video has been a fool for
you and I will see you in the next one.