Chapter 5
Advanced Configuration
43
string e nt limits o n the le ng th o f o p tio ns, a nd g re a te r
fle xib ility fo r intro d uc ing ne w o p tio ns in the future .
•
Flo w la b e ling c a p a b ility - A ne w c a p a b ility ha s b e e n
a d d e d to e na b le the la b e ling o f p a c ke ts b e lo ng ing
to p a rtic ula r tra ffic flo ws fo r whic h the se nd e r re q ue sts
sp e c ia l ha nd ling , suc h a s no n-d e fa ult Q ua lity o f
Se rvic e o r re a l-time se rvic e .
IPX:
It sta nd s fo r
I
nte rne two rk
P
a c ke t
E
xc ha ng e . It is a p ro to c o l
use d b y No ve ll Ne twa re . Inte rne two rk Pa c ke t Exc ha ng e
(IPX) is a le g a c y ne two rk p ro to c o l use d b y the No ve ll
Ne tWa re o p e ra ting syste ms to ro ute p a c ke ts thro ug h a n
inte rne two rk. IPX is a d a ta g ra m p ro to c o l use d fo r
c o nne c tio nle ss c o mmunic a tio ns – simila r to IP (Inte rne t
Pro to c o l) in the TCP/ IP suite . Hig he r-le ve l p ro to c o ls, suc h a s
SPX a nd NCP, a re use d fo r a d d itio na l e rro r re c o ve ry
se rvic e s.
To ma ke b e st-p a th ro uting d e c isio ns, IPX use s the se rvic e s
o f a d yna mic d ista nc e ve c to r ro uting p ro to c o l suc h a s
Ro uting Info rma tio n Pro to c o l [RIP]) o r Ne tWa re Link-Sta te
Pro to c o l [NLSP]).
No ve ll IPX ne two rk a d d re sse s a re uniq ue a nd a re
re p re se nte d in he xa d e c ima l fo rma t tha t c o nsist o f two
p a rts: a ne two rk numb e r a nd a no d e numb e r. The IPX
ne two rk numb e r, whic h is a ssig ne d b y the ne two rk
a d ministra to r, is 32 b its lo ng . The no d e numb e r, whic h
usua lly is the Me d ia Ac c e ss Co ntro l (MAC) a d d re ss fo r o ne
o f the syste m’ s ne two rk inte rfa c e c a rd s (NICs), is 48 b its
lo ng . IPX’ s use o f a MAC a d d re ss fo r the no d e numb e r
e na b le s the syste m to se nd no d e s to p re d ic t wha t MAC
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