Cisco Networking questions

[Snowy Commando]

Anybody with Networking Knowledge - I need some help...

I'm currently studying for a Cisco Networking Course and for my coursework I have mostly completed apart from some odd questions that I could not find the answers.

Any help appreciated for the following related questions:

1a. What kind of primitives does Internet Protocol Version 4 (Ipv4) have and Why?

1b. Suppose a network layer can directlyl contact with other network layer. What kind of primitives can appear?

1c. Why does Ipv6 not contain a protocol field?

I have already tried researching the answers but i would like to know if anybody with the appropriate knowledge can help.

 

[Cucumber]

1a..Yes
1b..Yes
1c..No

Sorry mate have no idea what your talking about! I dont know why i posted to tell you i dont know???

But im sure someone will know

+couldnt you just look it up on the internet, im sure there is plenty of pages with the info your looking for:grinthumb

 

[Snowy Commando]

Originally posted by Cucumber
1a..Yes
1b..Yes
1c..No

Sorry mate have no idea what your talking about! I dont know why i posted to tell you i dont know???

But im sure someone will know

+couldnt you just look it up on the internet, im sure there is plenty of pages with the info your looking for:grinthumb

Correct me if i'm wrong, but is the above reply completely useless to this topic and stating what i've already mentioned.

 

[Supra]

What semester of cisco are you on? Im on semester 2 chapter 11. You must be on semester 3 or 4 because I cant remember covering any of that.

 

[Mictlantecuhtli]

Originally posted by Snowy Commando:
1c. Why does Ipv6 not contain a protocol field?

[font=courier]

From Internet Protocol, Version 6 (IPv6) Specification:
Some IPv4 header fields have been dropped or made optional, to
reduce the common-case processing cost of packet handling and
to limit the bandwidth cost of the IPv6 header.

From Internet Protocol Specification, we can see that

This field indicates the next level protocol used in the data
portion of the internet datagram. The values for various protocols
are specified in RFC1700.

[quote]
A summary of the contents of the internet header follows: 

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |Version|  IHL  |Type of Service|          Total Length         | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |         Identification        |Flags|      Fragment Offset    | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |  Time to Live |    Protocol   |         Header Checksum       | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |                       Source Address                          | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |                    Destination Address                        | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |                    Options                    |    Padding    | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
[/quote]

note: IHL = Internet Header Length


What does Internet Protocol, Version 6 (IPv6) Specification say, then?

IPv6 Header Format 

   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |Version| Traffic Class |           Flow Label                  | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |         Payload Length        |  Next Header  |   Hop Limit   | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |                                                               | 
   +                                                               + 
   |                                                               | 
   +                         Source Address                        + 
   |                                                               | 
   +                                                               + 
   |                                                               | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
   |                                                               | 
   +                                                               + 
   |                                                               | 
   +                      Destination Address                      + 
   |                                                               | 
   +                                                               + 
   |                                                               | 
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 
[/quote]

About Traffic Classes:

The 8-bit Traffic Class field in the IPv6 header is available for use
by originating nodes and/or forwarding routers to identify and
distinguish between different classes or priorities of IPv6 packets.

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So, the way I see it is that Traffic Class and Extension Headers (Hop-by-Hop Options, Routing (Type 0), Fragment, Destination Options, Authentication and Encapsulating Security Payload) have replaced IPv4 protocol field.

Better wait for other opinions, this is just my guessing. I haven't taken any networking courses

[/font]

 

[Mac_Bug]

Supra: I don't think he's doing CCNA at all. Although the earlier CCNA chapters introduces certain protocols and their frame headers etc, Cisco has never stressed their importance. The term 'primitives' was NEVER used during the CCNA course (I can say that with 90% confidence....), and I have no clue what the hell a primitive is supposed to be.

 

[Honourableprawn]

eh?

Sorry Snowy, no idea wot ur on about. I'm Cisco certified and I've never heard of anything called primitives.

The Prawn:grinthumb