Networking For Hackers! (Common Network Protocols)
Summary
TLDR本视频深入探讨了网络协议的基础知识,强调了理解网络协议对于使用工具如Wireshark和进行黑客活动的重要性。视频首先介绍了IP地址的概念,解释了公有和私有IP地址的区别以及NAT的作用。随后,介绍了DHCP协议如何动态分配IP地址,以及IP、TCP、UDP、ARP、DNS、FTP、SMB、SMTP、SNMP、TELNET和HTTP等协议的功能和重要性。通过这些协议的概述,视频旨在帮助观众理解网络通信的基本原理,并为进一步学习网络工具打下坚实的基础。
Takeaways
- 🌐 IP地址是数字世界的基础,允许设备进行通信和连接。
- 🔄 私有IP地址在局域网内重复使用,通过NAT设备转换为公有IP地址以访问互联网。
- 📦 DHCP协议动态分配IP地址,有助于管理和优化网络中的IP地址使用。
- 🚀 IP协议作为数据包在互联网上的旅行指南,定义了数据传输的目的地和来源。
- 🔑 TCP协议通过三次握手建立可靠的连接,确保数据包的正确顺序和交付。
- 🏎 UDP协议不建立正式连接,适用于对速度要求高而对数据包丢失不敏感的应用。
- 🔍 ARP协议将IP地址映射到物理MAC地址,对网络设备正确路由流量至关重要。
- 🌐 DNS协议将人类易于记忆的域名转换为计算机使用的IP地址,简化了互联网导航。
- 📁 FTP协议用于网络间文件的传输,遵循客户端-服务器架构。
- 🖇️ SMB协议允许在局域网内共享文件、打印机和其他资源。
- ✉️ SMTP协议是电子邮件传输的基础,负责将邮件从一个用户发送到另一个用户。
- 🔄 SNMP协议用于管理和监控网络设备,但若被攻击者利用,可能导致严重后果。
- 🔗 Telnet协议允许远程会话,但由于安全性不足,已被SSH等更安全的协议取代。
- 🌐 HTTP协议是互联网上的主要通信协议,用于网页、数据和多媒体内容的传输。
Q & A
IP地址在数字世界中扮演着怎样的角色?
-IP地址是数字世界的基础,它们允许设备进行通信和连接,是进行电子邮件、视频聊天、观看YouTube视频、发送推文和浏览网页等功能的关键。没有IP地址,设备就无法在网络上被找到和通信。
为什么需要区分公共IP地址和私有IP地址?
-由于IPv4系统只有43亿个IP地址,不足以覆盖所有需要连接到互联网的设备,因此开发了私有IP地址系统以在局域网(LAN)内重用一组IP地址,这些地址在互联网上不可直接访问。
网络地址转换(NAT)设备是如何帮助局域网内的设备访问互联网的?
-NAT设备将局域网内的私有IP地址转换为公共IP地址,使得使用共享的公共IP地址的设备可以访问互联网。当内部设备想要进行互联网通信时,它向NAT设备发送请求,NAT设备记录内部IP地址并将其转换为路由器的外部IP地址。
DHCP协议是如何动态分配IP地址的?
-DHCP(动态主机配置协议)动态地为设备分配IP地址。当设备连接到使用私有IP地址的局域网时,它会向DHCP服务器请求IP地址,DHCP服务器随后为该设备分配一个在特定租期内使用的IP地址。
IP协议如何帮助数据包在互联网上导航?
-IP(互联网协议)像是一个旅行指南,帮助数据包知道它们要去哪里,即目的地和它们的来源。它通常与TCP协议配对使用,形成TCP/IP协议,确保数据包能够正确地从源头传输到目的地。
TCP协议中的三次握手过程是什么?
-三次握手是TCP连接开始时的一个过程,确保客户端和服务器准备好开始交换数据。它包括SYN(同步序列编号)包来启动连接,SYN-ACK(同步-确认)包作为响应,以及ACK(确认)包来确认连接的开始。
UDP协议与TCP协议相比有什么不同?
-UDP(用户数据报协议)与TCP(传输控制协议)相比,不关心每个数据包的确认交付,因此它更轻量级、更快,适合对速度要求高而不必确保每个数据包都完美传输的应用,如流媒体音乐或视频。
ARP协议在网络中有什么作用?
-ARP(地址解析协议)在以太网中充当翻译器,它的工作是将逻辑的IP地址与物理的MAC地址匹配起来,确保网络设备如路由器、网关和交换机能够正确地将流量路由到目的地。
DNS协议如何帮助我们浏览互联网?
-DNS(域名系统)通过将人类容易记忆的域名转换为互联网路由使用的语言——IP地址,帮助我们导航互联网。这样,用户只需记住域名,而不需要记住复杂的IP地址。
FTP协议是如何工作的?
-FTP(文件传输协议)遵循客户端-服务器架构,允许客户端从服务器请求文件,服务器则提供所请求的文件。FTP通过TCP/IP协议套件运行,确保网络间可靠的数据传输。
SMB协议允许哪些类型的资源共享?
-SMB(服务器消息块)协议允许计算机在局域网上共享文件、打印机和其他资源。客户端计算机通过TCP/IP或NetBIOS连接到服务器,一旦连接,客户端可以发送命令来访问共享文件夹、读取或写入文件,甚至使用共享打印机。
SMTP协议在电子邮件传输中扮演什么角色?
-SMTP(简单邮件传输协议)是电子邮件传输的基础协议,负责将电子邮件从一个用户移动到另一个用户。尽管SMTP最初在1983年被标准化,但它仍然是今天用于发送电子邮件的主要协议。
SNMP协议的主要功能是什么?
-SNMP(简单网络管理协议)是互联网协议套件的一部分,专门设计用于管理计算机和网络设备。SNMP允许计算机和网络设备相互通信和共享信息,以确保网络的顺畅运行。
为什么TELNET协议不再广泛使用?
-TELNET协议由于缺乏适合当代技术和通信的强大的安全特性,不再广泛使用。它以明文传输数据,包括登录凭证,容易受到恶意行为者的拦截,因此现代安全的远程访问协议如SSH(安全外壳协议)已经取代了TELNET。
HTTP协议如何支持现代网络应用?
-HTTP(超文本传输协议)是互联网的核心技术,作为网络应用的主要通信协议。最初设计用于检索静态网页,HTTP已经演变以支持我们今天常用的复杂网络应用。它基于消息模型,客户端发送请求到服务器,服务器响应相应的响应。
Outlines
🌐 网络协议基础与IP地址
本段介绍了网络协议的重要性,特别是IP地址,它们是数字世界的基础,允许设备进行电子邮件、视频聊天、观看YouTube视频、发送推文和浏览网页等活动。讨论了公网和私网IP地址的区别以及NAT(网络地址转换)设备如何使本地网络中的设备通过共享的公网IP地址访问互联网。此外,还介绍了DHCP(动态主机配置协议),它动态地为设备分配IP地址,以及IP数据包的结构和TCP/IP协议的工作原理。
📦 IP数据包结构与TCP协议
这一段深入探讨了IP数据包的头部信息,包括版本、互联网头部长度、类型服务、总长度、标识、IP标志和片偏移等字段。接着,详细解释了TCP(传输控制协议)头部的关键字段,如源端口和目的端口、序列号、确认号、TCP标志、窗口大小、校验和以及紧急指针。此外,还讨论了TCP的三次握手过程以及UDP(用户数据报协议)与TCP的不同之处,强调了UDP在不需要确保每个数据包都可靠传输的应用中的高效性。
🔍 ARP协议与DNS的作用
ARP(地址解析协议)负责将IP地址映射到MAC地址,这对于以太网上的设备通信至关重要。DNS(域名系统)作为互联网导航的关键部分,负责将人类易于记忆的域名转换为计算机使用的IP地址。DNS使得我们能够通过域名而非复杂的IP地址来访问网站。同时,段落还提到了DNS的安全性问题,包括DNS扫描和DNS欺骗攻击,以及FTP(文件传输协议)的基本工作原理和SMB(服务器消息块)在文件共享和打印服务中的应用。
📬 SMTP与SNMP协议
SMTP(简单邮件传输协议)是处理电子邮件传输的核心协议,自1983年标准化以来,至今仍在使用。SNMP(简单网络管理协议)是网络设备管理的关键部分,允许设备互相通信并共享信息。然而,SNMP的安全性问题使其成为攻击者的目标,攻击者可能会利用SNMP获取网络信息,甚至控制关键网络设备。
🔗 Telnet、HTTP与网络协议概述
Telnet是一种远程连接协议,允许用户在远程端点和主机机器之间建立连接。但由于其安全性不足,目前已被更安全的SSH(安全外壳协议)所取代。HTTP(超文本传输协议)是互联网上用于网页应用的主要通信协议,支持复杂web应用的数据传输。视频最后概述了这些协议的重要性,并鼓励观众在评论中提出对特定协议的兴趣,以便制作更多相关内容。
Mindmap
Keywords
💡网络协议
💡IP地址
💡NAT(网络地址转换)
💡DHCP(动态主机配置协议)
💡TCP(传输控制协议)
💡UDP(用户数据报协议)
💡ARP(地址解析协议)
💡DNS(域名系统)
💡FTP(文件传输协议)
💡SMB(服务器消息块)
💡SMTP(简单邮件传输协议)
Highlights
网络协议是数字世界的基础,对于使用Wireshark等工具至关重要。
IP地址是网络通信的核心,类似于家庭地址,使设备能够相互连接和通信。
IPv4系统有43亿个IP地址,不足以覆盖所有需要连接互联网的设备。
私有IP地址在局域网内重复使用,通过NAT设备转换为公共IP地址以访问互联网。
DHCP协议动态分配IP地址,有助于管理和优化网络中可用的IP地址。
IP协议帮助数据包在互联网上知道目的地和来源,常与TCP协议配对使用。
IP数据包头部包含版本、头部长度、服务类型等关键信息。
TCP协议通过三次握手建立稳定连接,确保数据包的顺序和可靠传输。
TCP头部包含源端口、目的端口、序列号等重要字段,对网络分析至关重要。
UDP协议与TCP不同,不建立正式连接,直接发送数据包,适用于对速度要求高的应用。
ARP协议将IP地址映射到MAC地址,对以太网设备正确路由流量至关重要。
DNS协议将人类易于记忆的域名转换为计算机友好的IP地址。
FTP协议用于网络间文件传输,遵循客户端-服务器架构。
SMB协议允许计算机在局域网内共享文件、打印机和其他资源。
SMTP协议是电子邮件传输的基础,负责将邮件从一个用户移动到另一个用户。
SNMP协议用于管理网络设备,允许设备间通信和信息共享。
Telnet协议允许远程连接,但由于其安全性不足,已逐渐被SSH等更安全的协议取代。
HTTP协议是互联网的基础技术,作为主要的网络应用通信协议。
Transcripts
hey everyone today we're talking about
common Network protocols some of you
asked for a full guide on wire shark but
I realized that to use wi shark well you
need to understand Network protocols
first in the hacking World knowing about
Network protocols is essential because
you can't do much without them that's
why I'm making this video to help you
grasp the basics of network protocols
which will set you up for Success when
using tools like wire shark and hacking
let's begin with IP addresses internet
protocol addresses are like the backbone
of the digital world there would allow
us to do things like email video chat on
Zoom watch YouTube send tweets and
browse the web you could say they're
almost as important as the world itself
spinning in fact you're able to watch
this video on YouTube because of IP
addresses every digital device we use
whether it's a computer laptop phone or
tablet gets assigned an IP address this
address enables devices to communicate
and connect with each other think an IP
address as similar to your house address
without it no one would be able to find
you and send you mail now let's discuss
public and private IP addresses our IP
address system has a limitation there
aren't enough IP addresses to cover all
devices that need to connect to the
internet the current ipv4 system has
only 4.3 billion IP addresses which
isn't sufficient considering there are
over 8 billion people on the planet each
with multiple devices to address this
scarcity a system was developed to reuse
a group of IP addresses within a local
area network or Lan which are not
accessible over the Internet these
addresses can be used repeatedly within
each local network helping conserve The
Limited number of IP addresses available
these private addresses typically start
with numbers like
192 168 10 point or
17216 you might have noticed these
private IP addresses such as
192 16 8 or 10 point something when
checking your network configuration for
example using IF config on a collie
system these addresses are only usable
within your local area network and
cannot be used to communicate over the
Internet directly for internet
communication your private IP address
needs to be translated into a public IP
address by a network address translation
ornat device this translation process
allows devices within your local network
to access the internet using a shared
public IP
address this is necessary because
private IP addresses within a local area
network cannot be directly used on the
internet since they are not unique many
lands use the same private IP addresses
internally when a machine inside the
land wants to communicate over the
Internet it sends a request to the natat
device the natat device then records the
internal IP address of the machine in a
table and converts it to the external IP
address of the router when the response
packet returns from its destination on
the the internet the natat device checks
its table and forwards the packet to the
internal IP address of the original
machine within the Lan this whole
process happens seamlessly and
individual systems or users within the
Lan typically don't realize that their
private IP addresses are being
translated to a public IP address by the
natat device to enable internet
communication the next protocol is DHCP
Dynamic host configuration protocol or
DHCP is a protocol that dynamically
assigns IP address add es this means
that instead of having a fixed IP
address all the time your device gets a
new IP address each time it connects to
a network DHCP is commonly used on local
area networks or lands where private IP
addresses are used when a device joins a
lan it sends a request to the DHCP
server asking for an IP address the DHCP
server then assigns an IP address to
that device for a specific period known
as a lease this lease defines how long
the device can use that particular IP
address the interesting part is that
each time you connect to the Lan you're
likely to receive a different Dynamic IP
address although usually within the same
range this Dynamic allocation of IP
addresses by DHCP helps manage and
optimize the use of available IP
addresses within the network all right
let's talk about the next protocol IP or
Internet Protocol in an easy to
understand way IP is like a travel guide
for data packets on the internet it
helps these packets know where to go the
destination and where they're coming
from the source it's often paired up
with other protocols like TCP to form
what's commonly known as TCP IP now
let's take a peek at what's inside an IP
packet header this header is like the
packets ID card carrying information
that can be super useful for someone
exploring hacking or doing forensic
investigations in the first row of this
ID card version it tells us which
version of Ip is being used either V4 or
V6 internet header length this is all
about the length of the header moving on
to the second row type of service or to
this part describes the packet service
type like if it's focused on speed
reliability or cost Effectiveness total
length this tells us the overall size of
the packet including its data in the
third row identification each packet
gets a unique ID helpful for putting
together fragmented packets IP Flags
this field helps us know if the packet
is split into smaller parts or not which
can be sneaky for bypassing security
measures fragment offset if a packet is
split this field tells us where it
starts in the sequence now on to row
four and five Source or destination
these are super important because they
show where the packet is coming from and
where it's headed finally in row six
options this is a flexible part of the
header and it's optional to use padding
if needed this part fills in any extra
space in the header understanding these
details helps in figuring out how data
travels across the internet and can even
give clues about the systems sending and
receiving the data the next protocol is
TCP in the TCP header there are several
important fields that are crucial for
both aspiring hackers and forensic
investigators to grasp starting with row
One Source Port destination Port these
fields are vital as they determine the
source and destination port showing
where the communication is coming from
and where it's headed moving on to row
two sequence number this number is
generated by the sender's TCP stack and
ensures that packets are arranged in the
correct order when they arrive it's also
crucial in preventing man in the middle
attacks next in row three
acknowledgement number this Echoes back
the sequence number confirming that the
packet has been received if no
acknowledgement is received within a set
time the sender resends the packet to
ensure successful delivery this
reliability distinguishes TCP from UDP
which doesn't guarantee packet delivery
skipping ahead to the flags in row four
sin initiates a new connection Finn
signals the normal closing of a
connection a acknowledges receipt of a
packet crucial after the three-way
handshake RSD indicates a hard close of
a connection often used to communicate
errors urg marks urgent data in the
packet PS sh directs the data past the
buffer to the application understanding
these flags is essential especially for
those familiar with Recon tools like
nmap or hping 3 as they're used to
create packets for specific purposes
such as evading detection or eliciting
responses from secure systems in row
four the window siiz field manages
packet buffering aiding in flow control
it's also useful for OS identification
as different operating systems have
varying window sizes allowing for OS
prediction with about 80% accuracy the
cheim in row five ensures data Integrity
while the urg pointer indicates urgent
data if the urg flag is set lastly row
six contains options and padding
allowing for additional information and
aligning the TCP header to a multiple of
32 bits understanding these TCP header
Fields is crucial for analyzing Network
traffic identifying potential security
threats and gaining insights into the
systems communicating over the Network
every TCP connection starts with a
three-way handshake imagine you're
trying to start a conversation with
someone let's say ordering a pizza over
the phone you dial the pizza place and
say hey I'd like to order a pizza this
is like the sin packet where you're
initiating the connection and saying
hello I want to talk to you the pizza
place responds sure we're ready to take
your order this is like the sin act
packet where the server acknowledges
your request and says hi I'm here and
ready to chat let's get started you then
confirm great I'd like a large pepperoni
pizza please this is like the ACT packet
where you acknowledge the server's
response confirming that you're ready to
proceed with the conversation or in this
case the pizza order after this
three-way handshake the pizza place
knows you're ready to place your order
just like in TCP both the client and
server know they're ready to start
exchanging data it's a way of ensuring a
smooth and reliable connection before
diving into the main conversation or
data
transfer let's dive into UDP or user
datagram protocol UDP is a different
kind of Beast compared to TCP while TCP
is all about establishing a solid
connection like a handshake and ensuring
every piece of data gets delivered UDP
takes a more Carefree approach it's like
the difference between sending a formal
letter with tracking TCP versus tossing
a postcard in the male UDP here's what
makes UDP unique unlike TCP which
requires a Formal Connection setup like
the three-way handshake we talked about
earlier UDP doesn't bother with all that
it just sends packets out into the world
without worrying about getting a
confirmation of delivery because UDP
skips the whole connection Assurance
process it's lighter and faster than TCP
this makes it perfect for applications
where speed matters more than ensuring
every single packet gets through
perfectly UDP shines in scenarios where
efficiency is key and losing an
occasional packet isn't a big deal think
of streaming music or video missing a
few seconds here or there won't ruin
your experience but lagging behind
because of a slow connection would
definitely be a problem some of the key
protocols that use UDP include DNS SNMP
or ntp we'll dive deeper into these
protocols later on now let's talk about
the next protocol a RP or address
resolution protocol ARP is like a
translator for devices on an Ethernet
Network
its job is to match up IP addresses
which are logical with Mac addresses
which are physical this way when a new
device joins the network ARP assigns it
an IP address within the Network's range
and links it to its unique Mac address
this information is crucial for network
devices like routers gateways and
switches to correctly Route traffic to
the intended destination now here's how
the RP Works in simple terms imagine you
have two computers on the same ethernet
Network let's call them computer 1 and
computer 2 computer 1 wants to send a
message to computer 2 but it needs to
know computer 2's Mac address like a
home address computer one first checks
its ARP table which is a list of known
Mac addresses and their corresponding IP
addresses if it finds computer 2's Mac
address in the table great it can send
the message directly if computer 1
doesn't have computer 2's Mac address in
its ARP table it sends out a broadcast
message to all devices on the network
nwor asking hey who has IP address of
this computer 2 sees the broadcast
message and responds directly to
computer 1 saying I have IP address of
this and my Mac address is this now that
computer 1 knows computer 2's Mac
address it can send the message directly
to computer 2's Mac address and the
communication is successful ARP is
essential for smooth communication
within a network but it's also a
potential Target for attackers who might
try to manipulate Ark messages to
intercept or redirect Network traffic a
tactic known as a man in the- Middle
attack it's important to note that a RP
lacks authentication making it
vulnerable to exploitation by hackers
this feature can be used to discover all
the systems on a network easily this
becomes particularly useful when
attempting to hack into another system
within the local area network or when a
hacker compromises a single user on the
network and wants to Pivot to a more
valuable Target such as a database
server there are various tools available
to hackers for discovering systems on a
network these tools operate by sending
out gratuitous ARP requests prompting
systems on the network to respond with
their IP addresses and Mac addresses for
example in our Collie system we have a
tool called net discover that can be
used for this
purpose
now the next protocol is denas the
domain name system or DNS is a
fundamental protocol that plays a
crucial role in how we navigate the
internet imagine a world without DNS we
would have to remember countless IP
addresses just to access our favorite
websites picture having to memorize the
lengthy ipv4 32-bit addresses for Google
Facebook YouTube and other essential
sites let alone dealing with even longer
IPv6 128bit addresses it would be quite
a daunting task thankfully DNS comes to
the Rescue by translating domain names
something humans are good at remembering
into IP addresses the language of
internet routing in simpler terms DNS is
like a translation service that converts
a domain name like wwwg googlec into the
computer friendly IP address that the
internet understands and uses to Route
data so when you type a domain name into
your browser such as www googlec DNS
steps in behind the scenes to quickly
translate it into the corresponding IP
address allowing your device to connect
to the desired website seamlessly DNS is
what makes navigating the internet so
much easier and userfriendly for all of
us the domain name system has come a
long way in terms of security but it
used to be quite fragile and susceptible
to attacks while improvements have been
made over the years attacks on DNS still
occur albeit less frequently one common
type of attack involves harvesting
information from DNS servers on the
target Network a technique known as DNS
scanning and DNS reconnaissance
attackers can gather valuable data from
DN servers such as domain names and
Associated IP addresses which can be
used for further
exploitation on local area networks
attackers May exploit DNS
vulnerabilities by spoofing DNS
responses using tools like DNS spoof
this allows them to redirect client
traffic to a malicious local system
controlled by the attacker for example
an attacker could redirect banking
traffic to their own fraudulent website
capturing sensitive credentials and
financial
information the next protocol is FTP or
file transfer protocol the FTP is a
client server protocol used for
transferring files over a network here's
an overview of how FTP works and its
current usage FTP follows a client
server architecture where a client such
as a computer or device requests files
from a server and the server provides
the requested files FTP operates over
the TC pip Suite of protocols ensuring
reliable data transmission across
networks FTP uses two channels for
communication command Channel used by
the client to send commands to the
server such as requesting files or
directories data Channel used for actual
file transfers when a client requests a
file the server opens a data channel to
transfer the file to the client clients
can perform various actions on files
using FTP including downloading
uploading editing copying and deleting
files on the server while FTP was widely
used in the past for file sharing and
management its popularity has decreased
with the rise of HTTP for file transfers
especially for public file sharing on
the web however FTP remains a common
protocol for private and secure file
sharing such as in banking system or
other environments where data security
and privacy are
Paramount the next protocol we'll talk
about is SMB which stands for Server
message Block it's a communication
method that computers use to share files
printers and other resources over a
local network think of it as a way for
computers to talk to each other and
share stuff when you use SMB one
computer acts as the server that has the
files or printers others want to access
while the other computers are the
clients that want to get those files or
use the printers here's how it works in
simple steps clients computers connect
to servers other computers using tcpip
or
netbios which are just ways for
computers to talk to each other over a
network once connected clients can send
commands to the server to access shared
folders where files are stored read or
write files or even use shared printers
basically SMB lets you do on your
computer what you normally do like
access ing files or printing but over
the network so you can share things with
others on the same network SMB in
Windows and Samba in Linux Unix systems
have historically been significant
sources of critical vulnerabilities and
this trend is likely to continue in the
future over the past decade there have
been several critical vulnerabilities
related to SMB and windows these
vulnerabilities have allowed attackers
to send specially crafted packets to SMB
Services exploiting weaknesses in the
protocol by exploiting these
vulnerabilities attackers could execute
remote code with system privileges on
the target system in simpler terms
attackers could take control of
vulnerable systems and have full access
to everything on them the next protocol
we'll discuss is the simple male
transport protocol commonly abbreviated
as SMTP SMTP is a crucial protocol in
the digital world especially for
handling emails snp's main job is to
move emails from one user to another
even though SMTP was first standardized
back in 1983 it's still the fundamental
protocol used for sending emails today
albeit with some Modern upgrades and
improvements in simple terms SMTP acts
as the Postal Service of the internet
ensuring that your emails get delivered
the next protocol we'll look at is SNMP
which stands for simple Network
management protocol SNMP is a crucial
part of the Internet Protocol Suite
designed specifically for managing
computers and Network devices in simpler
terms SNMP allows computers and network
devices to communicate and share
information with each other it's like a
system of Administrators managers
keeping an eye on a group of computers
or devices agents to ensure everything
runs smoothly indeed the simple Network
management protocol SNMP is often
overlooked but plays a crucial role in
maintaining a smoothly functioning
Network however its importance also
makes it a prime target for attackers if
an attacker manages to breach SNMP they
gain access to a wealth of information
about your network they can potentially
decrypt encrypted VPN Communications
allowing them to eases drop on sensitive
data being transmitted additionally they
can view and potentially manipulate
every device connected to your network
SNMP operates on UDP ports 161 and 162
enabling network devices to communicate
with each other and allowing
administrators to manage and monitor
these devices however in the wrong hands
SNMP access can lead to disastrous
consequences attackers could Harvest
sensitive information disrupt network
operations or even take control of
critical devices like routers and
switches causing widespread Havoc the
next protocol is telnet telnet is a
protocol designed for remote
connectivity allowing a user to
establish connections between a remote
endpoint and a host machine to initiate
a remote session when a connection is
established tnet Pro prompts the user at
the remote endpoint to log in once
authenticated telnet grants the endpoint
access to network resources and data
located on the host computer originating
from the 1960s telnet can be considered
one of the earliest versions of remote
communication protocols used in the
development of the modern internet
however due to its lack of robust
security features suitable for
contemporary technology and
Communications telnet is no longer
widely used the main reason for Tel
Net's declining usage is its
vulnerability to security threats talet
transmits data including login
credentials in plain text making it
susceptible to interception by malicious
actors consequently modern secure
protocols such as SSH or secure shell
have largely replace telnet for remote
access due to their enhanced security
features such as encryption and stronger
authentication
mechanisms the next is HTTP protocol the
hypertext transfer protocol or http p is
a foundational technology of the
internet serving as the primary
communication protocol for web
applications originally designed for
retrieving static web pages HTTP has
evolved over time to support complex web
applications that we commonly use today
HTTP operates on a message-based Model
where a client sends a request to a
server and the server responds with a
corresponding response it's important to
note that HTTP is connectionless meaning
that a connection is established and
closed for each request response cycle
however it uses TCP transmission control
protocol as its underlying transport
mechanism for Reliable data transmission
in essence HTTP is the backbone that
enables seamless communication between
clients such as web browsers and servers
facilitating the transfer of web pages
data and multimedia content across the
internet hey everyone in this video we
covered some of the most used and
essential Network protocols while we
didn't dive deep into each protocol I
hope this overview helped you understand
their significance in networking if
you're interested in learning more about
any specific protocol feel free to drop
a comment below I'll consider your
requests for future videos and create
content that addresses your specific
interests and I am making video on wi
shark until then make sure to watch this
video and stay tuned for more
informative content on network protocols
and tools thanks for watching and I'll
see you in the next video
[Music]
deal
浏览更多相关视频
The Internet: Crash Course Computer Science #29
2000万中国人都在翻墙!“墙”究竟是怎样工作的?你的翻墙方法真的安全吗?现今主流翻墙技术存在的缺陷
Computer Networks: Crash Course Computer Science #28
2023 WebApp Pentesting/Hacking Roadmap // How To Bug Bounty
Geoffrey Hinton: The Foundations of Deep Learning
The World Wide Web: Crash Course Computer Science #30
5.0 / 5 (0 votes)