tolle protokolle frankfurt/main presentation by dipl.-ing. ralf steffler netcool certified...
TRANSCRIPT
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Tolle Protokolle Frankfurt/MainPresentation by
Dipl.-Ing. Ralf StefflerNetcool Certified Consultant
01.09.2006
http://www.obs-itconsulting.com
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Am Anfang war das Bit
"Geschrieben steht: Im Anfang war das Wort! Hier stock ich schon! Wer hilft mir weiter fort?
(Berühmte Szene aus Goethes Faust)
Ich kann das Wort so hoch unmöglich schätzen,Ich muß es anders übersetzen..."
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Unschärfe eines Bit
F(jω)= A
0
T
e -jωt
2 Δf
Spektrum
ΔT
Fourier Transformation
Zeitsignal
Δf =1/ΔT
Zeit
Frequenz
Spannung
dt
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Codierung
Manchester
0 1 1 1 0 +
-
0 1 1 1 0
AMI
Ethernet ISDN
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Das Ascii-Alphabet
A 0100 0001B 0100 0010C 0100 0011D 0100 0100
F 0100 0110
...
a 0110 0001
b 0110 0010c 0110 0011d 0110 0100e 0110 0101f 0110 0110
E 0100 0101
außerdem Steuer- und Sonderzeichen !
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Serielle Schnittstelle
TDGRD
25
1
Buchse- 25 polig
RNG
RTSDCD DSRCTS
DTR
RD
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Modem-Verbindung
PC
Modem
Telefonnetz
PC
01100110
Modem
01100110
Frequenzmodulation gemäß V.23 1200 bit/sec halb-duplexPhasenmodulation gemäß V.22 1200 bit/sec voll-duplexPhasenmodulation gemäß V.22 bis 2400 bit/sec voll-duplexPhasenmodulation gemäß V.32 9600 bit/sec voll-duplex
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ADSL
Phone< 3,4 kHz
Downstream1 MHz
Voltage
FrequencyUpstream 100kHz
Downstream 768 kbit/s
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DSL/ISDN-Splitter
Splitter Splitter
ISDN
InternetT-Online
....
....
....
DSL und ISDN über eine Leitung
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Wide Area Networks
Daten IP X.25
Daten und Sprache ATM
Frame Relay ISDN
IP
Sprache ISDN
Telefonnetz
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Network Layers
Physical Interface
Data Link
Network
Application
1
2
3
4
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High-Level Data Link Control
Flag Address Control Data FCS
HDLC Frame
Flag
Level 2 Protocol von
X.25, Frame Relay, ISDN
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Frame Relay
Flag DLCI Control Data FCS
HDLC Frame
Flag
7E7E 2 Byte 1 Byte bis zu 1600 Byte 2 Byte
X.25 light
Keine Fehlerkorrektur!
Korrupte Frames werden verworfen!
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ATM
Daten- oder Leerzelle
5 Byte
48 Byte
GFC VPI
VPI VCI
VCI
VCI PT C
HCS
Zellen mit fester Länge
53 Byte
bis 622 Mbit/s
High Speed Network
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Datex-P (X.25)
GFI/LGN LCN P-Type Data (max. 128 Byte)
Flag Address Control Data FCS
HDLC Frame
Flag
Fehlerfreie Überragung
aber zu langsam!
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Local Area Networks
Token Ring FDDI
Ethernet
Preamble Dest. Addr. Source Addr. Type Data CRC
max. 1500 Byte
Toter StandardAm Aussterben
Die Zukunft
Bandbreiten 10 -1000 Mbit/sec
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Wireless LAN
Client
IP-NetworkClient
Bis zu 54 Mbit/sec
Header 802.11 Data FCSIV
Key ID
Not encrypted encrypted
WEP Frame
128 Bit-Verschlüsselung
PointAccess
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IP-Layer
Vers IHL
32 Bit Source IP-Address
32 Bit Destination IP-Address
Total Length
Identification Flags Fragment Offset
Time to live Protocol Header Checksum
Options Padding
Data Data Data ....
Type
32 Bit
Network Layer
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IP-Adressen
Jede Interface-Karte benötigt eine im Netz eindeutige IP-Adresse
IP-Adressen belegen 4 Byte
Dynamische Zuweisung über DHCP
Client
192.168.10.1 192.168.10.2
Client
IP Connectivity
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Private IP-Adressen
Klasse A 10.0.0.0 - 10.255.255.255
Klasse B 172.16.0.0 - 172.31.255.255
Klasse C 192.168.0.0 - 192.168.255.255
Private IP-Adressen werden im Internet nicht geroutet !
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TCP-Layer
Source Port
Data Offset
Destination Port
Sequence Number
Acknowledgement Number
Options Padding
Reserved Window Size
Checksum Urgent Pointer
Data Data Data
Flags
Multiplex-Layer
ftp
telnet
ssh
http
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Well Known Ports
telnet Port 23
ssh Port 22
ftp Port 21
.....
Client
HOST
Destination IP-Address
Source IP-Address
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TCP Connection Setup
Client
Der Verbindungsaufbau benötigt 3 Pakete !
HOST
SYN SEQ 321 No Ack
SYN SEQ 567 Ack 322
SYN SEQ 322 Ack 568
data data data
>telnet host
Host:>login
.....
.....