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Home > Archive > CCNA > August 2000 > another question
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| Ok the question that I have should be a easy one, I'm studing for the ccna for some time now and all I've ever known is what cisco says, but when having a conversation with a few friends who were studing for n+ we had a small debate that spx was a transport layer protocol, when I've learned that it is a network protocol. Which is so??? | |
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| SPX is a transport layer protocol and it falls into the Transport layer of NetWare protocol stack. I am wandering how it can be network layer protocol?
Hash
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| You are right it is a transport layer. To make it simple
SPX = TCP Connection oriented
IPX = IP (host & network) addressing
hope it was simple buddy
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| Hey Clint, wassup?, you weren't at work yesterday. Studying I presume :-)
I encountered this also on the Network+ test. There is certainly disagreement among various sources. The conclusion that I am coming to is that it has to do with whose model you are referring to.
So far I have encoutered four(yes four) models:
OSI-7 layers
DOD-4 layers
Novell-3 layers
Cisco-3 layers(see http://www.angelfire.com/az2/examslam/ccna/osi2.htm question #32)
IPX/SPX both reside on the second layer(network?-any cne's here?) of the novell model although SPX corresponds to TCP on the transport layer of the OSI model(see Exam Cram 640-507 page 232).
Any clarification on these issues would be greatly appreciated, as well as a clue from those who have taken 640-507, which models we should expect to see on the test.
Word to the wise: NOTE which model they refer to at the beginning of the question. OSI, DOD, Novell, or Cisco.
Certmadman,
A+, Network+, I-net+ (praying for CCNA) | |
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| Update: It's not number 32. Examslam randomly assigns question numbers at http://www.angelfire.com/az2/examslam/ccna/osi2.htm
So here's the questions on the Cisco model:
What Cisco layer provides segmentation of contention networks?
Access *
Physical
Network
Distrubution
Core
Transport
Data Link
At which Cisco layer would broadcast domains be defined?
Core
Network
Physical
Distrubution *
Acces
Transport
Routers are typically used at which layer of the Cisco three-layer model?
Access
Core
Network
Data Link
Distrubution *
Which Cisco layer is responsible for breaking up collission domains?
Physical
Access *
Core
Network
Distrubution
Data Link | |
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| It's not the cisco 3 layer.
The 3 layers for network design are
CORE , DISTRIBUTION, ACCESS
Core is a at the top, it's a cloud where all the internet, pop, backbone routers and mail (etc.) servers lie. You don't want many collisions up here. It's like the head school that connects all the others at the distribution layer.
Distribution is where routers connect individual classrooms. Your supposed to employ access lists at this level. Also you have some traffic coming up from the access layer (classrooms) to the distribution (main network closet) and back down to another classroom at the access layer. Databases and file servers are located at this layer IF they will be used by more than one classroom at the access layer.
The access layer (classrooms) contain workstations. If there is a server that is only used by one classroom then it is located here and called a Workgroup server.
I'm sorry if my analogy about a school was a little messed up but I hope you understood nonetheless  )
CORE
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DISTRIBUTION
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Access Access Access
Good Luck!
Rage
Network+, A+ | |
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| Thank you Rage!
As I read thru that thread I was hoping somebody knew the differences 
Yankee | |
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