MindMap Gallery computer network
It summarizes detailed content including overview, physical layer, application layer, transport layer, network layer, data link layer, etc. It is a rare reference for students majoring in computer science and technology.
Edited at 2024-12-16 01:53:18Find a streamlined guide created using EdrawMind, showcasing the Lemon 8 registration and login flow chart. This visual tool facilitates an effortless journey for American users to switch from TikTok to Lemon 8, making the transition both intuitive and rapid. Ideal for those looking for a user-centric route to Lemon 8's offerings, our flow chart demystifies the registration procedure and emphasizes crucial steps for a hassle-free login.
これは稲盛和夫に関するマインドマップです。私のこれまでの人生のすべての経験は、ビジネスの明確な目的と意味、強い意志、売上の最大化、業務の最小化、そして運営は強い意志に依存することを主な内容としています。
かんばんボードのデザインはシンプルかつ明確で、計画が一目で明確になります。毎日の進捗状況を簡単に記録し、月末に要約を作成して成長と成果を確認することができます。 実用性が高い:読書、早起き、運動など、さまざまなプランをカバーします。 操作簡単:シンプルなデザイン、便利な記録、いつでも進捗状況を確認できます。 明確な概要: 毎月の概要により、成長を明確に確認できます。 小さい まとめ、今月の振り返り掲示板、今月の習慣掲示板、今月のまとめ掲示板。
Find a streamlined guide created using EdrawMind, showcasing the Lemon 8 registration and login flow chart. This visual tool facilitates an effortless journey for American users to switch from TikTok to Lemon 8, making the transition both intuitive and rapid. Ideal for those looking for a user-centric route to Lemon 8's offerings, our flow chart demystifies the registration procedure and emphasizes crucial steps for a hassle-free login.
これは稲盛和夫に関するマインドマップです。私のこれまでの人生のすべての経験は、ビジネスの明確な目的と意味、強い意志、売上の最大化、業務の最小化、そして運営は強い意志に依存することを主な内容としています。
かんばんボードのデザインはシンプルかつ明確で、計画が一目で明確になります。毎日の進捗状況を簡単に記録し、月末に要約を作成して成長と成果を確認することができます。 実用性が高い:読書、早起き、運動など、さまざまなプランをカバーします。 操作簡単:シンプルなデザイン、便利な記録、いつでも進捗状況を確認できます。 明確な概要: 毎月の概要により、成長を明確に確認できます。 小さい まとめ、今月の振り返り掲示板、今月の習慣掲示板、今月のまとめ掲示板。
computer network
Overview
Base
concept
autonomous system
Resource sharing
Consent Rules - Agreement
composition
composition
hardware
link
switching device
End systems, etc.
software
Application layer
protocol
working method
core
switching device
link
edge
Host
Function
resource subnet
Communication subnet
characteristic
data communication
Resource sharing
distributed
reliability
load balancing
Classification
Transmission range
WAN, switching
Metropolitan area network, mostly Ethernet
LAN, broadcast technology
personal area network
Transmission method
peer to peer
Broadcast
Topology
total
ring
star
net
use
male
Specialize
exchange
medium
wired
wireless
microwave
Bluetooth
radio
Performance indicators
bandwidth
Delay
Delay bandwidth product
round trip delay
Throughput
rate
Channel utilization
physical layer
transmission medium
twisted pair
Shieldable
Unblockable
coaxial cable
50Ω and 75Ω
and. . advantage
optical fiber
one
characteristic
Features
Mechanical properties
Electrical characteristics
process characteristics
principle
Digital signal (baseband signal)
Analog signal to digital signal
Analog signal (wideband signal?)
analog signal
data link layer
No confirmation, no connection
wired communication
CSMA/CD
Collision detection contention channel before sending
No conflict detected during sending (sent successfully)
Maximum time a conflict was detected - contention period
Minimum frame length = single-side transmission delay × transmission rate × 2
Conflict detected
Backoff algorithm
Ethernet
Confirmed but no connection
wireless communication
CSMA/CA
General collision avoidance
Handling different states
idle
wait for difs, send
busy
The backoff algorithm takes a backoff value
idle
Fallback value countdown
Confirmation received
Backoff algorithm gets backoff value
idle
Countdown
No confirmation received
Backoff algorithm gets backoff value
idle
Countdown
Interframe space IFS
SIFS
PIFS
DIFS
Hidden site problem
RTS request sent
Original address, purpose, communication time
CTS allows sending
Communication duration (replicate RTS)
802.11 Wireless LAN
Media Access Control (MAC sublayer)
channel allocation
Static (channel partitioning media access control)
Frequency Division Multiplexing FDM
Time Division Multiplexing TDM
StatisticsSTDM
Wavelength Division Multiplexing WDM
Code Division Multiplexing (CDM)
dynamic
ALOHA
idle
Send directly
conflict judgment
Timeout not confirmed
Conflict handling
Resend directly
Hours and minutes ALOHA
idle
Sent at the beginning of the time slot
conflict judgment
Conflict handling
Resend directly
CSMA protocol
1-Adhere to CSMA
Non-persistent CSMA
p-stick to CSMA
CSMA/CD
Collision detection
CSMA/CA
idle
conflict judgment
Conflict handling
Flow control and reliable transmission
ARQ
stop waiting for agreement
Select retransmission protocol
Go back n frames
LAN (broadcast transmission)
hub
802.3
Topology
mac frame
conflict
channel division
random access
802.11
physical structure
Frame (where to where)
conflict
Virtual LAN
Ethernet
Topology
Token Ring
FDDI (Fiber Distribution Digital Interface)
Logic: Bus
Physics: Star
transmission
MAC frame
medium
CSMA/CD
Wireless LAN
Wide area network (packet technology)
switch
How to implement point-to-point sending?
PPP agreement
Link
frame
full duplex
HDLC protocol
VLAN isolation conflict and broadcast domain?
network layer
Network layer functions
Heterogeneous network interconnection (virtual ip network is referred to as IP network)
packet forwarding
SDN
Northbound interface
southbound interface
east-west interface
Routing
routing algorithm
static()
dynamic
Distance vector routing algorithm such as: RIP protocol
Link state routing algorithm such as: OSPF protocol
hierarchical routing
autonomous system internal protocol
RIP
OSPF
Inter-autonomous system protocols such as
BGP
IPv4
Grouping (fixed header length 20B optional)
Field
Version 4
Header length (unit 4B, range 20-60 bytes)
Total length (unit 1B, range, maximum 65535B)
logo
logo
Chip offset (8B)
Time to live TTL
Sharding
address
structure
Features
The router and the host have one interface and one network number.
Routers distinguish networks, forwarders, switches, etc. do not.
A LAN, the network number must be the same
NAT
IPv6
Features
Sharding
header length
security
domain
address
Dotted decimal representation
Grading concept
IPv4-IPv6 transition
Dual stack protocol
tunnel technology
subnet mask
Routing table contents
CIDR
IP address/network number number of digits
route aggregation
routing table
Search method
Hierarchical search (binary clue)
ARP
DHCP
ICMP (network layer protocol, placed in ip data)
ICMP error report message
The destination is unreachable
source suppression
time exceeds
Parameter problem
Change routing (redirect)
Do not send error report messages
error report message
Special (127.0.0. or 0.0.0.0)
multicast address datagram
ICMP query message
Echo request and reply messages (Application: PING)
Timestamp request and reply messages
Address mask request and reply messages
Router query and advertisement messages
IP multicast
concept
Hardware multicast
01-00-5E-00-00-00
IGMP multicast
Is there a host joining?
Cycle through to see if there are still active hosts
Mobile IP
concept
communication process
Network layer equipment
transport layer
Transport layer functions
Function
Logical communication between processes (invisible to routers)
Error detection of received packets (headers and data)
Provide two services
Transport layer addressing and ports
Port function
port number
Server port number
Well-known port number (0-1023)
Registration port number (1024-49151)
Client port number (49152-65535)
socket
Connectionless and connection-oriented services
TCP full duplex reliable
UDP is unreliable
UDP
datagram
Overview
quick
One-to-one, one-to-many, many-to-one, many-to-many communication
Message-oriented
UDP header format
Source port number
Destination port number
UDP length
16-bit UDP checksum
UDP checksum
12B pseudo header
calculate
sender
Add a dummy header, replace 0, and make up an even number of bytes
One's complement sum
The one's complement of the sum is written to the check field
Receiver
Add pseudo header, inverse code and sum
All 1, correct
TCP
Features
Only one-to-one
Full duplex, both parties can send messages at any time
TCP segment
Source port, destination port
Serial number 4B
Confirmation number
Data offset (header length) 4 bits, unit 4B
reserve
Emergency URG
Emergency pointer 2B
Establish connection
Establish
release
Send data
TCP flow control and congestion control
Application layer
Model
DNS
Iterative query
recursive query
Ftp
Control Teleport 21
Teleport 20
PORT active mode
random port
Order
Server port 20
PASV passive mode
Order
random port
client port
data
data, data segment, datagram, data frame, bits
File list is also data transfer
SMTP
POP3
IMAP
WWW
HTTP