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11706000
Computer Networking
Beschreibung
Computer Sience Mindmap am Computer Networking, erstellt von Joakim Rødland am 07/12/2017.
Keine Merkmale angegeben
computer sience
Mindmap von
Joakim Rødland
, aktualisiert more than 1 year ago
Mehr
Weniger
Erstellt von
Joakim Rødland
vor mehr als 6 Jahre
48
1
1
Zusammenfassung der Ressource
Computer Networking
Application Layer
Overwiew
Transport services available to applications
Security
Encryption
Decryption
Reliable data transfer
Timing
Throughput
Client / Server
Peer-to-peer
Application Layer Protocols
HTTP - HyperText Transfer Protocol
Non-Persistant Connection
One handshake for each object
Persistant Connection
One handshake for all objects
Web Cashing
Pull protocol
SMTP - Simple Mail Transfer Protocol
Push protocol
POP3 - Post Office Protocol v.3
IMAP - Internet Mail Access Protocol
DNS - Domain Name Service
DNS Cashing
Non DNS Cashing
Root DNS servers
.com DNS server
Amazon.com DNS servers
.no DNS servers
vg.no DNS servers
.ord DNS servers
pbs.org DNS Servers
Peer-to-peer
Bittorrent
Tracker
For each torrent
Algorithm
Rarest First
Transport Layer
Analogy
Two houses on different sides of a country
Multiplexing
Add Socket
Dest. port
Source port
Application layer data
Other header flields
Demultiplexing
Remove socket
Application layer data
Source port
Dest. port
Other header fields
Reliable Data Transfer
Finale State Machine
Checksum
Positive and Negative acknowledgements
Duplicated ACKs
Secuence Numbers
Countdown Timer
Transport Layer Protocols
UDP - User Datagram Protocol
UDP segment structure (32 bit)
Header
Length
Checksum
Provides, but does not do anything to recover from an error
Dest. port
Source port
Data
Application Data (message)
No establishment of connection
TCP - Transport Control Protocol
Three-way Handshake
SYN
SYN ACK
ACK
MSS - Maximum Segment Size
1460 bytes
TCP Serivce Quality
Reliable Data Transfer
In order data delivery
TCP Connection Management
Network Control
Flow Control
Control to not overflow memory in sender and receiver
Control the flow of the internet
Congestion Control
Guiding pricible
Lost segment
Timeout
Loss Event
Decrease sender`s rate of segments
4 duplicate ACK
Loss Event
Decrease sender`s rate of segments
ACK segment arrives
Increase sender`s rate
Congestion Control Protocols
Congestion Avoidance
Fast Recovery
Slow Start
Network Layer
Overview
Forwarding
The fastest path for that spesific datagram.
Routing
Every step and desition on the way. Every little switch that takes place
Local Forwarding table
In every router. Exhange between routers to know whitch way is the fastest.
Network Service Model
Best-effort Service
Data Plane
Router
Inside the router
Input Port
Switching fabric
Methodes to switch packets
Memory
Bus
Interconnected Network
Output Port
Queuing
Input port
Switch fabric capasity to switch < Input Port`s processing speed
Output Port
Switch fabric capasity to switch > Output Port`s processing speed
Forwarding
Destination Based Forwarding
Forward be knowing the destination of a spesific package
Generalized Forwarding
Forward by knowing more information than just the destination
Packet Scheduling
FIFO - First in First Out
Priority Scheduling
Round Robin
WFQ - Weighted Fair Queuing
IP-addresse
IPv4 - Internet Protocol version 4
IPv4 Datagram (32 bit)
Version number
Header length
Type of service
Identifier flags, Fragmentation offset
Protocol
Source and Destination - IP-adresse
Data (segment)
Options
Time to live
Datagram length
Header checksum
Fragmentation
192.32.216.9 = 11000001.00100000.11011000.00001001
DHCP
DHCP server discovery
DHCP server offcer(s)
DHCP request
DHCP ACK
IPv6 - Internet Protocol version 6
No fragmentation
No checksum
No options
IPv6 Datagram (128 bit)
Flow Lable
Payload length
Traffic Class
Next header
Hop limit
Version
Source and destination addresse
Data
Tunneling
Control Pane
Per-router control
BGP - Border Gate Protocol
OSPF - Open Shortest Path First
Routing is computed in each node
Logically centralized control
CA - Control Agents
Communicate with Controller
Routing is not computed at each node
Routing Algorithm
LS - Link state
Dijkstras
Needs to know link status of every node in the network
DV - Distant Vector
Each node talk to only its directly connected neighbors
AS - Autonomous Systems
Intra-AS routing protocol
OSPF - Open Shortest Path First
Dijkstra algorithm
Internal
Inter-AS routing protocol
BGP - Border Gate Protocol
BGP Connection
eBGP - External BGP
iBGP - Internal BGP
External
Link layer
Physical Layer
Overview
Packet Switching
Allocalte on Demand
Circut Switching
Pre allocated shared recourses
Encapsulation
Internet Protocol Stack
Mega Stor Drage Fanger
Message
Segment
Datagram
Frame
Application Layer
Transport Layer
Network Layer
Link Layer
Physical Layer
OSI-Modell
Application Layer
Presentation Layer
Session Layer
Transport Layer
Network Layer
Data Link Layer
Physical Layer
Calculate Traffic Intensity
Transmission Delay
Propagations Delay
Processing Delay
Queuing Delay
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