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| bfattima 2002-09-26, 2:24 pm |
| What is the default encapsulation for frame relay on CISCO router?
A- HDLC
B- IETF
I know the answer, However I was practicing some questions and the answer they gave me is totaly dif from I read
Thank you | |
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| I saw another version of this question somewhere too:
Your company is having trouble connecting a Cisco router to a Nortel router using Frame Relay. What is the default encapsulation type for Frame Relay on a Cisco router?
A. HDLC
B. PPP
C. IETF
D. Cisco
E. ANSI
They gave the answer as C. The explanation was if you are connecting to a non Cisco router the frame relay encapsulation type is IETF. So be VERY careful about the context that the question was posed in.... | |
| Widgewaam 2002-09-27, 11:51 am |
| The default is HDLC. I think Cisco has it's own proprietary version of HDLC, that's why it won't work with other routers. You would need to use IETF for that. If you have subinterfaces, with Cisco and non-Cisco devices you're sending FR traffic to, you can specify under the subinterface which type of encapsulation to use. | |
| bfattima 2002-09-27, 2:11 pm |
| quote:
Originally posted by kphua
I saw another version of this question somewhere too:
Your company is having trouble connecting a Cisco router to a Nortel router using Frame Relay. What is the default encapsulation type for Frame Relay on a Cisco router?
A. HDLC
B. PPP
C. IETF
D. Cisco
E. ANSI
They gave the answer as C. The explanation was if you are connecting to a non Cisco router the frame relay encapsulation type is IETF. So be VERY careful about the context that the question was posed in....
The question was posted as a cisco router?? | |
| duanesnyder 2002-09-27, 4:19 pm |
| Right from the cisco acadamy online..
"Frame Relay was originally conceived as a protocol for use over ISDN interfaces. Today, Frame Relay is an industry-standard, switched data link-layer protocol that handles multiple virtual circuits using High-Level Data Link Control (HDLC) encapsulation between connected devices. Frame Relay uses virtual circuits to make connections through a connection-oriented service."
I had to look it us eeven though I knew the answer after I read the post where someone said it could not be... Seems he did not read chapter 6 semester 4 very well... :-) | |
| duanesnyder 2002-09-27, 4:30 pm |
| Actually I did not finish the last post, as IETF is not even a protocol, but a engineering task force to set rules.
"Internet Engineering Task Force. Task force consisting of over 80 working groups responsible for developing Internet standards. The IETF operates under the auspices of ISOC" | |
| Johnno 2002-09-27, 7:47 pm |
| As far as frame relay goes...There are only 2 encapsulation types: Cisco and IETF. IETF being the RFC1490 encapsulation.
The default encapsulation type is CISCO unless you manually type in IETF. Again in case you missed it, the default encapsulation for frame relay is Cisco.
As others have said here, IETF is only entered when connecting non cisco devices to your cisco device over frame relay.
Your question is wrong or at least the person who wrote it was thinking about something else and typed it incorrectly.
Anyways there is my 5 cents. | |
| chodan 2002-09-27, 8:53 pm |
| Even if you connect to non Cisco devices the default on a Cisco router is still "Cisco".
You will need to manually change it to IETF.
The real test will not be so ambiguous. | |
| darthfeces 2002-09-28, 7:26 pm |
| p5r1(config-if)#encapsulation frame-relay ?
ietf Use RFC1490/RFC2427 encapsulation
<cr>
p5r1(config-if)#encapsulation frame-relay
configure nothing and you get hdlc
as previously stated | |
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| So the default encapsulation is the Cisco implementation of HDLC (the one with the proprietary Type field), which is why it is labelled "cisco", is that right?
quote:
Originally posted by darthfeces
p5r1(config-if)#encapsulation frame-relay ?
ietf Use RFC1490/RFC2427 encapsulation
<cr>
p5r1(config-if)#encapsulation frame-relay
configure nothing and you get hdlc
as previously stated
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HDLC cannot be the answer and 
IETF is used when non-cisco routers are there....i shud say wrong options u were given.... 
Cisco is the default encap for frame relay on a cisco router......