Ethernet and TCPIP Basics ( Tellabs)
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Transcript of Ethernet and TCPIP Basics ( Tellabs)
7/23/2019 Ethernet and TCPIP Basics ( Tellabs)
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Ethernet and TCP/IP Basics
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Objectives
> This chapter introduces basic concepts related to LAN
interconnection
> OSI Reference Model and Data Encapsulation
> Ethernet Basics
> T!"I! Basics> Brid#in#$ S%itchin# and Routin#
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OSI Reference Model
and Data Encapsulation
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OSI Reference Model
Net%or& services for applications Application
Data representation and transfer s'nta(Presentation
o))unication channel )ana#e)entSession
Net%or&*%ide end*to*end connectionTransport
Addressin# and routin#Network
Access to transport )ediaData Link
Bit trans)ission in the ph'sical )ediu)Physical
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o))unication Bet%een +osts
Application Application
Presentation Presentation
Session Session
Transport Transport
Network Network
Data Link Data Link
Physical Physical
Se#)ents
!ac&ets
,ra)es
Bits
+ost A +ost B
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Tellabs -.// !roducts in OSI Model
Application
!resentation
Session
Transport
Net%or&
Data Lin&
!h'sical
Data Representation and
Transfer Syntax
Communication Channel
ana!ement
"nd#to#end Data $low
and "rror Control
Network Ser%ices for
Applications
&it Transmission in the
Physical edium
Access to Transport
edia 'framin!(
Routin! and Addressin!
"#mail News!roups )e* Applications
Tellabs -/// net%or& )ana#er
P"+,-P+,+.$
Port num*ers /0 12 /23/4 454345/
.P R.P 6SP$ .S#.S .CP D7CPRouter L0 SwitchTellabs -../ T(*R$ STE*./M
TCP 8DP Net&"8. SP9 .S6 TP
"thernet $R AT PPP 7DLC&rid!e L/ Switch
ES0$ Tellabs -../ T(*R$ STE*./M
:;/< 42&ase#T xDSL 9;/4 7SS. +;=20
Repeater37u* odem
Tellabs -.// Data Multiple(ers$ NT0s
OSI La'er Na)e Description Interfaces$ protocols andnet%or& ele)ent e(a)ples
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Data Encapsulation E(a)ple
"#mail messa!e Data Data
DataSe#)ent
header Se!ment
DataSe#)ent
header
!ac&et
header
Packet
Data!ac&et
header ,ra)e
header
Se#)ent
header ,ra)e
trailer
edium dependent frame
244444244424242444244224224224224 &its
6S.
4
/
0
<
=
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I!*Ethernet Encapsulation
> T'pical encapsulation t'pe inside Ethernet LANs
Bits
244444244424242444244224224224224
6S.
4
/
0
<Se#)entData
T!
+eader
I!+eader
!ac&etT!+eader
Data
Ethernet
+eader
I!
+eader
,ra)eData
T!
+eader
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Bits244444244424242444244224224224224
6S.
4
/
0
<Se#)entDataT!
+eader
I!
+eader !ac&etData
T!
+eader
,ra)eI!
+eader
Ethernet
+eader Data
T!
+eader
,R
+eader
,ra)eI!
+eader
Ethernet
+eader Data
T!
+eader
Ethernet Over ,ra)e Rela'Encapsulation
> T'pical encapsulation t'pe in re)ote brid#es
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Ethernet Over !!! Encapsulation
Bits244444244424242444244224224224224
6S.
4
/
0
<Se#)entData
T!
+eader
I!
+eader !ac&etData
T!
+eader
,ra)eI!
+eader
Ethernet
+eader Data
T!
+eader
!!!
+eader
,ra)eI!
+eader
Ethernet
+eader Data
T!
+eader
> T'pical encapsulation t'pe in re)ote brid#es
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I! Over ,ra)e Rela' Encapsulation
Bits
244444244424242444244224224224224
6S.
4
/
0
<Se#)entDataT!
+eader
I!
+eader !ac&etData
T!
+eader
,ra)eI!
+eader
,R
+eader Data
T!
+eader
> T'pical encapsulation t'pe in I! access routers
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Ethernet Basics
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OSI
Application
Presentation
Session
Transport
Network
!h'sical
Data Link
!h'sical La'er
opper
Optical
fiber
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Ethernet Net%or& Speeds
> Ethernet versions available currentl'
> ./ Mbit"s$ .// Mbit"s$ . 1bit"s and ./ 1bit"s
> Both t%isted pair copper cables and fiber can be used in
cablin#
> ./Base*T"2$ .//Base*T"2$ .///Base*T"2
> Onl' fiber cablin#
> ./1Base*R"3 4R5LAN$ 353AN6
> ./".// Mbit"s )ostl' used in co)puter access lin&s
> ."./ 1bit"s are used> in server connections
> bet%een s%itches and Routers
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OSI
Application
Presentation
Session
Transport
Network
Physical Physical
Ethernet II
-/7 series
SMA"D
!!!
Data Lin&
Data Lin& La'er
LLCAC
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+ard%are Addressin#
>The ph'sical address of one net%or& interface
> Sa)e as MA or Ethernet address
> ,or e(a)ple //*</*>?*,-*B*.<
> 0sed in unicast )essa#es
>The net%or& broadcast address
> ,,*,,*,,*,,*,,*,,
> 0sed in broadcast )essa#es
>A )ulticast address
> for e(a)ple /9*//*//*7/*//*// 4I! Multicast Address6
> 0sed in )ulticast )essa#es
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T!"I! Basics
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Transport and Net%or& !rotocols
OSI
Application
Presentation
Session
Transport
Network
Physical Physical
Data Link LLCAC
I! I!2
S!2T!NetBE0I
DL
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OSI
Application
Presentation
Session
Transport
Net%or& .nternet Protocol
Network Access
Physical Physical
Internet !rotocolInternet !rotocol 4I!64I!6
Routin# !rotocols
4OS!,6Data Link
T!"I! !rotocol Suite *Internet !rotocol
T!"I!
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Internet !rotocol * I!
> 0sed in routin# and addressin#
> onnectionless unreliable best*effort deliver' of data
> an use different t'pes of net%or&s
> for e(a)ple Ethernet$ ATM$ ,ra)e Rela'> ,ra#)entation and reasse)bl'
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I! !rotocol ,or)at
DATA
8 8 8
S68RC" .P ADDR"SS
2 1 45 /< 04< 4
:"RS T6TAL L"N+T7S"R:.C" T?P"7L"N
.D"NT.$.CAT.6N $RA+"NT 6$$S"T$LA+S
7"AD"R C7"C@S8PR6T6C6LT." T6 L.:"
D"ST.NAT.6N .P ADDR"SS
.P 6PT.6NS '.$ AN?( PADD.N+
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I! ,ra#)entation E(a)ple
> ,ra#)entation for pac&ets bi##er than ?=/ b'tes is
needed bet%een R. and R7
7ost A 7ost &
N"T 4
T8 4B22
&ytes
N"T 0
T8 4B22
&ytes
N"T /
T8 =B2
&ytes
R4 R/
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Internet !rotocol Addressin#
> 97*bit addresses
> Net%or& part and host part
> The lo%est host nu)ber 5 net%or& address
> The hi#hest host nu)ber 5 broadcast address
4<;4;//;/5
N"T)6R@ PART 76ST PART
44222242 ; 22242244 ; 22242442 ; 22244242
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4 4 4 4 2 reser%ed for future useClass "
I! Address lasses
> !rivate address ran#es> ./8/8/8/ * ./87==87==87==
> .?78.<8/8/ * .?789.87==87==
> .>78.<-8/8/ * .>78.<-87==87==
hostidnetid2
2 1 45 /< 044 / 0 <
Class A
netid hostid4 2Class &
4 4 2 netid hostidClass C
4 4 4 2 multicast addressClass D
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lass Address andDefault Net%or& Mas&
I! Address 4dec6 4< 4 // /5
I! Address 4bin6 44222242 22242244 22242442 22244242
Net%or& Mas& 4bin6 44444444 44444444 44444444 22222222
Net%or& Mas& 4dec6 /BB /BB /BB 2
lass address
Abbreviated for)at of the address and )as&
> .>;8.>87787< " 7; 4nu)ber of @.s in the )as&6
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Subnettin# %ith lass Address
Subnet Net%or& Address +ost Ran#e Broadcast Address822 4><;4>;//;2 4><;4>;//;4# 5/ 4><;4>;//;50
24 4><;4>;//;5< 4><;4>;//;5B # 4/5 4><;4>;//;4/=
42 4><;4>;//;4/1 4><;4>;//;4/> # 4>2 4><;4>;//;4>4
44 4><;4>;//;4>/ 4><;4>;//;4>0 # /B< 4><;4>;//;/BB
Su*network Address Ran!es
I! Address 4dec6 4< 4 // /5
I! Address 4bin6 44222242 22242244 22242442 22 244242
Net%or& Mas& 4bin6 44444444 44444444 44444444 44 222222
Net%or& Mas& 4dec6 /BB /BB /BB
Class C address with Su*nettin!
4/
E l f
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E(a)ple ofSubnetted lass Net%or&
4<;4;//;.*<7
/BB;/BB;/BB;4/4<;4;//;<=*.7<
/BB;/BB;/BB;4/
4<;4;//;.7>*.>/
/BB;/BB;/BB;4/
4<;4;//;.>9*7=;
/BB;/BB;/BB;4/
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Sies of Subnet%or&s
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Subnettin# E(ercise
> lass A private net%or&C ./8/8/8/ " 7;
> Subnetted
> ,ind the net%or& address and the broadcast address for
the follo%in# hosts
.P Address Network ask
42;2;2;51 /BB;/BB;/BB;/<1
42;2;2;414 /BB;/BB;/BB;/B/42;2;2;4/ /BB;/BB;/BB;4/
42;2;2;/2/ /BB;/BB;/BB;//<
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Ans%ers to Subnettin# E(ercise
.P Address Network Address &roadcast Address
42;2;2;51 42;2;2;5< 42;2;2;=4
42;2;2;414 42;2;2;412 42;2;2;41042;2;2;4/> 42;2;2;4/1 42;2;2;4>4
42;2;2;/2/ 42;2;2;4>/ 42;2;2;//0
T!"I! ! t l S it
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OSI T!"I!
Application
Presentation
Session
Transport
Network Internet !rotocol
Network access
Physical Physical
Internet ontrol
Messa#e !rotocol
4IM!6
Address Resolution!rotocol 4AR!6
T!"I! !rotocol Suite IM! and AR!
Data Link
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Address Resolution !rotocol * AR!
> AR! )aps the &no%n I! address to a MA address8
> I! to MA address )appin# is &ept in the d'na)ic
AR! table8
. need the AC
address of
4=/;45;0;/ 4=/;45;0;4 4=/;45;0;/
AR! Reuest
)essa#e tr'in# to
resolve MA
address for I!C
.?78.<8987
Someone is
askin! for my
AC address
AR! Response
)essa#e tellin#
MA address
for I!C
.?78.<8987
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TAR+"T .P 'octets 2#0(
AR! Messa#e ,or)at
> Operation field specifies
> AR! Reuest 4.6
> AR! Response 476
7ARD)AR" T?P" PR6T6C6L T?P"
7L"N PL"N 6P"RAT.6N
S"ND"R 7A 'octets 2#0(
S"ND"R 7A 'octets <#B( S"ND"R .P 'octets 2#4(S"ND"R .P 'octets /#0( TAR+"T 7A 'octets 2#4(
TAR+"T 7A 'octets /#B(
2 1 45 /< 04
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Internet ontrol Messa#e !rotocol
> IM! is used to send error$ control and test )essa#es
carried in I! pac&ets
> IM! )essa#e e(a)plesC
> Destination unreachable> Echo
> Echo repl'
> Ti)e e(ceeded for data#ra)
> !in# co))and uses echo and echo repl' and
tests the T!"I! connection up to the net%or& la'er
> Traceroute co))and utilies IM! echo
T!"I! ! t l S it
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T!"I! !rotocol Suite *Transport La'er
OSI T!"I!
Application
Presentation
Session
Transport
Network .nternet Protocol
Network access
Physical Physical
Trans)ission ontrol
!rotocol 4T!6
0ser Data#ra) !rotocol
40D!6
Transport
Data Link
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Transport"Internet La'er Interface
> !ac&ets carried b' the I! protocol indicate the clientla'er protocol that uses the pa'load data
TCP 8DP
5 4=
.P
Transport
Layer
.nternet
Layer
!rotocol ID field
in the I! header
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Trans)ission ontrol !rotocol * T!
> T! is a reliable connection oriented protocol
> T! is responsible for error control
> T! for)s a virtual circuit bet%een the
co))unicatin# applications
> T! for%ards data to%ards application la'er based
on the port nu)ber
I! addressC ./8./8./8.
T! source portC ./7;
T! destination portC =///
I! addressC ./8./8./87=/
T! source portC =///
T! destination portC ./7;
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T! !rotocol ,or)at
DATA
8 8 8
AC@N6)L"D+""NT N8&"R
2 42 45 /< 04<
6PT.6NS '.$ AN?( PADD.N+
D"ST.NAT.6N P6RTS68RC" P6RT
S"8"NC" N8&"R
).ND6)C6D" &.TS7L"N R"S"R:"D
8R+"NT P6.NT"RC7"C@S8
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T! ,unctional E(a)ple
Recei%e AC@ 4
Recei%e AC@ /
Recei%e AC@ 0
Recei%e Packet 4
Send Packet 4
Send Packet /
Send Packet 0'After that sender
must wait for the
AC@4 *efore
sendin! more packets(
"%ents at Sender Site Network essa!es "%ents at Recei%er Site
Send AC@ 4
Recei%e Packet /
Send AC@ /
Recei%e Packet 0Send AC@ 0
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0ser Data#ra) !rotocol * 0D!
> 0D! is a connectionless and unac&no%led#ed
protocol li&e I!
> Best*effort deliver'
> Multiple(in#> Li#hter to transfer than T!
> 0sed b' T,T! and SNM! application protocols
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0D! !rotocol ,or)at
DATA
8 8 8
2 45 04
8DP D"ST.NAT.6N P6RT8DP S68RC" P6RT
8DP "SSA+" L"N+T7 8DP C7"C@S8
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T!"I! !rotocol Suite
OSI T!"I!
Application
Presentation
Session
TransportTransport
Network .nternet
Data Link Network access
Physical Physical
Telnet
,ile Transfer
!rotocol 4,T!6
Trivial ,ile Transfer
!rotocol 4T,T!6
Si)ple Net%or&
Mana#e)ent
!rotocol 4SNM!6
Application
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Application"Transport La'er Interface
> T! and 0D! use port nu)ber to pass the data to the
application la'er protocols
> 3ell*&no%n port nu)ber used for application la'er soft%are
,T! Telnet +TT! DNS T,T! SNM!
T! 0D!
Application
La'er
Transport
La'er
/4 /0 12 B0 5 454
E(a)ples of
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Protocol Port Port Num*er
$TP#data /2
$TP /4
SS7 //
Telnet /0
STP /B
7ost Name ').NS( </
DNS B0
+opher =2
7TTP 12
P6P0 442S8N RPC 444
NNTP 44>
Net&T Name Ser%; 40=
Net&T Session Ser%; 40>
.AP 4<0
LDAP 01>
7TTP o%er TLS3SSL <<0
LDAP o%er TLS3SSL 505
Telnet o%er TLS3SSL >>/
.AP o%er TLS3SSL >>0
.RC o%er TLS3SSL >><
P6P0 o%er TLS3SSL >>BLotus Notes RPC 40B/
PPTP ne!otiation 4=/0
N$S /2<>
S.P B252
.RC 555=
RealAudio3:ideo =2=2
TCP
Protocol Port Port Num*er
DNS B0
&ootp Ser%er 5=
&ootp Client 51T$TP 5
S8N RPC 444
Net&T Name Ser%; 40=
Net&T D!m; Ser%; 401
SNP 454
SNP Trap 45/
.SA@P '.@"( B22
L/TP 4=24
N$S /2<
.CP 7TTP Def; 04/1
.CP Def; Port 0402
RTP B22<
RTPC B22B
S.P B252
RealAudio Data
Destination3source port 4 is 5=2,
Destination3Source port / is =4=2
8DP
E(a)ples ofApplications and !ort Nu)bers
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E(a)ple ApplicationsC Telnet
Telnet connection to port /0
Terminal Applicationsoftware
> 0ser access to a re)ote host
> 0sin# application soft%are on the re)ote host as ifdirectl' connected
> 0ses T!
T!
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E(a)ple ApplicationsC ,T!
> ,ile Transfer !rotocol * ,T!
> ,ile transfer bet%een re)ote co)puters
> 0ser securit'C user na)e and pass%ord
> lient*server architecture
> ontrol connection and data transfer connection inseparate ports
> 0ses T!
,T! Server ,T! lient
$TP data connection to port /2
$TP control connection to port /4
T!
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E(a)ple ApplicationsC T,T!
> Trivial ,ile Transfer !rotocol * T,T!
> ,ile transfer bet%een re)ote co)puters %ithout user"pass%ordverification
> lient*server architecture> Onl' data transfer connection needed
> 0ses 0D!
T,T! Server T,T! lient
T$TP connection to port 5
0D!
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ApplicationsC +TT!
> +'perte(t Transfer !rotocol * +TT!
> T'picall' used %ith the 333C co))unication bet%een the%eb bro%ser and the %eb server
> !rotocol for transferrin# various t'pes of infor)ationC te(t$h'perte(t$ audio$ i)a#es$ video
> Transaction*oriented client"server protocol
> 0ses T!
333 Server 333 Bro%ser
7TTP connection to port 12
T!
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E(a)ple ApplicationsC SNM!
> Si)ple Net%or& Mana#e)ent !rotocol SNM!
> Monitorin# of the net%or& ele)ents
> ,aults 4traps6
> !erfor)ance statistics
> Mana#e)ent Infor)ation Base 4MIB6 stores the description
of each )onitored object associated %ith a net%or&
ele)ent
> 0ses 0D!
SNM! NMS
SNM! a#ents
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Brid#in# and Routin#oncepts
LAN Interconnect o)ponentsC
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S%itch
Repeater " +ub
)AN
x x x x x x
S%itch
Brid#e or Router
Corporate
LAN
LAN Interconnect o)ponentsCRepeater$ S%itch$ Brid#e and Router
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x x x x x x
LAN I o)ponentsC Repeater"+ub
> The )ain purpose of a repeater is to e(tend the ph'sical len#th of aLAN
> Repeater re#enerates the si#nal but does not understand the contentof the bit strea)
> Traditional LAN built %ith repeaters is called flat LAN
> ,lat LAN provides e(tra load to net%or& because all co)puters
hear each othersF )essa#e transfer 4broadcast all over the LAN6
+ub
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LAN I o)ponentsC Brid#e
> E(tends the ph'sical len#th of LAN e8#8 bet%een t%obuildin#s
> ,ilters traffic bet%een t%o LAN se#)ents based on MAaddresses
> ,unctions in OSI la'er 7
> Transparent to the users
"nd station "nd station
0 # Network layer 0 # Network layer
/ # LLC / # LLC
AC AC
4 # Physical layer4 # Physical layer
Brid#e
LAN Se!ment LAN Se!ment
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> Multiport brid#e$ also called Ethernet s%itch> Main purpose is to filter traffic based on MA
addresses and thus save band%idth on a LAN
> L7 s%itches have replaced traditional hubs in the
LAN environ)ent
"nd station "nd station
0 # Network layer 0 # Network layer
/ # LLC / # LLC
AC AC
4 # Physical layer4 # Physical layer
L7 S%itch
LAN Se!ment LAN Se!ment
LAN I o)ponentsC L7 S%itch
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Brid#e T'pesC Local Brid#e
> R chec&
> Destination chec&
> Discard"for%ard
LAN A
LAN &MA I!
MA I!
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Brid#e T'pesC Re)ote Brid#e
LAN A LAN &Leased line
connection
MA I! MA I!
MA I!
> R chec&
> Destination chec&
> Discard"for%ard
> Encapsulate Ethernet to
3AN protocol
> hec&"re)ove 3AN
encapsulation
> R chec&
> Destination chec&
> Discard"for%ard
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LAN I o)ponentsC Router
> S%itches traffic bet%een its ports based on OSI la'er 9 addresses> !rovides better filterin# possibilities co)pared to la'er 7 co)ponents
> Operatin# routers reuires )ore &no%led#e co)pared to brid#es or L7s%itches
"nd station "nd station
< # Transport layer < # Transport layer
0 # Network layer 0 # Network layer
/ # LLC / # LLC
AC AC4 # Physical layer
4 # Physical layer
Router
LAN Se!ment LAN Se!ment
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Su))ar'
Ans%er the uestions in 'our )aterialG