CCNA Cyber Ops SECFND 210-250 Lecture 1 (TCP-IP fundamentals)

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00:00 bismillah rahman rahim assalamu alaikum welcome back

00:03 and we are here at lecture number 1

00:06 CCNA Cyber Op Security Fundamental

00:09 is the lecture

00:12 210-250 you know about the book

00:15 if you buy the library

00:18 210-250 and 210-255

00:21 security fundamental and security operations

00:24 we will cover both of them

00:27 there is no catch up

00:30 before starting this work

00:33 i will give you a suggestion

00:36 go to urdu it academy

00:39 go to courses

00:42 and this CCNA ICND 1

00:45 i assume you have read this

00:48 because this is very important

00:51 i have no point to

00:54 give you a short description

00:57 everyone who works at the SOC

01:00 should know about TCP/IP

01:03 protocol suite, fundamental of IP packet

01:06 OSI layer model, application presentation

01:09 session, transport layer, IP addresses

01:12 RFC IP addresses, 169.254

01:15 IP addresses

01:18 because one day you will be in a SOC

01:21 and you will be monitoring security

01:24 and you will see

01:27 an IP address coming from 169.254

01:30 and producing traffic

01:33 and your colleague will tell you

01:36 this is a malicious IP address

01:39 this is a strange IP address

01:42 and you will say

01:45 this is a misconfiguration

01:48 when you will talk about this

01:51 it means you know about this

01:54 you should be on that level

01:57 you should know about TCP 3way handshake

02:00 you should know about UDP

02:03 i will give you a common example

02:06 one day a person says

02:09 you opened UDP port 23 and i can't check

02:12 i will tell you a common thing

02:15 if you want to check your access

02:18 to a server

02:21 you can go to telnet

02:24 sysco.com

02:27 and type 80

02:30 you will see a blank screen

02:33 you will say port 80 is open

02:36 he says you opened port 80

02:39 but i am telling you telnet

02:42 is a common troubleshooting method

02:45 if you want to use port 443

02:48 you will type 443

02:51 it will show you if 443 is open

02:54 what was he doing

02:57 he said i opened telnet

03:00 and you said you opened port 443

03:03 i said telnet is a TCP protocol

03:06 and i opened UDP port

03:09 i am not googling this

03:12 you should know these basic things

03:15 this is a networking 101

03:18 you should know about ARP, DCP

03:21 ICMP

03:24 people ask questions in interviews

03:27 to confuse people

03:30 tell me which port does ICMP work on

03:33 if i ask you this question

03:36 you will say 80, 443

03:39 no, ICMP is a different protocol

03:42 it does not use TCP, UDP

03:45 it uses ICMP protocol

03:48 how to do end to end packet delivery

03:51 i have explained this in detail

03:54 OSI layer model

03:57 switch hub, router

04:00 if you don't know this

04:03 data is on top layers

04:06 segmentation, packets

04:09 frames and bits

04:12 segments, packets, frames

04:15 application, presentation, session

04:18 transport, headers

04:21 network layer, IP header

04:24 data link, frames, MAC

04:27 physical layer, bits

04:30 4 layer TCP/IP model

04:33 ISO layer model

04:36 maps only 4 layer TCP/IP model

04:39 4 layer TCP/IP model

04:42 is also called TCP/IP stack

04:45 or

04:48 DUD model

04:51 protocol of packets network

04:54 in 1974

04:57 DUD wrote standard

05:00 because it was a defense project

05:03 ARPANET switched towards TCP

05:06 it was working on NCP

05:09 network control protocol

05:12 it was a legacy protocol

05:15 in 1960s

05:18 ARPANET became DARPA

05:21 started in 1970, published in 1984

05:24 OSI 7 layer model

05:27 in 1983

05:30 ARPANET on TCP/IP

05:33 OSI standardized it

05:36 4 layer TCP/IP model

05:39 7 layer OSI model

05:42 all work the same

05:45 it is a map

05:48 TCP/IP is application

05:51 presentation, session

05:54 SMTP, email

05:57 HTTP post request

06:00 TCP/IP layer model

06:03 application, transport, internet

06:06 physical layer

06:09 ATIP

06:12 best way is

06:15 ATIF

06:18 you can use any other way

06:21 it is encapsulation process

06:24 HTTP post packet

06:27 HTTP post

06:30 HTTP packet

06:33 TCP/UDP

06:36 TCP header

06:39 encapsulation

06:42 IP layer

06:45 IP address

06:48 Ethernet

06:51 physical layer

06:54 3 layers

06:57 3,2,5,6,7

07:00 1,2,3,4

07:03 4 layers

07:06 when it reached receiving end

07:09 Ethernet header

07:12 HTTP header

07:15 HTTP post request

07:18 web services

07:21 interesting thing

07:24 I have not studied

07:27 one person asked

07:30 between one server and one client

07:33 communication

07:36 in detail

07:39 I have not studied

07:42 when you are

07:45 pulling data

07:48 from HTTP

07:51 I did not get that job

07:54 anyway

07:57 IP protocol

08:00 TCP

08:03 IP protocol

08:06 IP header

08:09 layer 3

08:12 connectionless protocol

08:15 don't worry about the sequencing

08:18 addressing, network and host

08:21 IP protocol

08:24 ignore it

08:27 this is your header

08:30 this is IPv4 header

08:33 version 0 to 4

08:36 IPv4

08:39 IP header

08:42 out of sync

08:45 IP header

08:48 8 bits

08:51 quality of services

08:54 6 bits

08:57 congestion

09:00 8,535 bytes

09:03 present

09:06 16 to 31

09:09 these 3 fields are used for

09:12 fragmentation of packet

09:15 and identifying

09:18 flag

09:21 fragment

09:24 I remember

09:27 I discussed

09:30 when someone is telling

09:33 version

09:36 I have told in detail

09:39 time to live is important

09:42 number decrement

09:45 default is 30

09:48 router opened

09:51 -1 increment

09:54 -29 increment

09:57 loop create

10:00 packet is roaming

10:03 when it is 0

10:06 discard it

10:09 as it reaches

10:12 important

10:15 packet

10:18 TTL counter 1

10:21 use it

10:24 what IP

10:27 which IP

10:30 help preventing loops

10:33 TTL packet

10:36 loop preventing

10:39 value is 30

10:42 IP address

10:45 32 bits

10:48 A class

10:51 127

10:54 RFC

10:57 1918

11:00 A class

11:03 B class

11:06 C class

11:09 A class

11:12 B class

11:15 192

11:18 172

11:21 16

11:24 RFC

11:27 1918

11:30 RFC

11:33 1918

11:36 RFC

11:39 1918

11:42 RFC

11:45 1918

11:48 RFC

11:51 1918

11:54 RFC

11:57 1918

12:00 RFC

12:03 1918

12:06 RFC

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15:12 RFC

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