hey guys,

I ran across these test sample questions and I am not sure of the answers. If you could offer your input, that would be great. I believe these answers are right, but i want to double check. Thanks!

Which WAN technology uses two data link encapulations?

ISDN (my answer)
FDDI (wrong, its not even a WAN technology)
ATM (uses CELLS but not two data link encaps)
Frame Relay (fractional t1 lines, not really defined)

IGRP uses what for best path determination?

MTU
Cummulative Interface Delay
path bandwidth value,
reliability from source to destination
link load in bits per second
hold down timers for updates

Which WAN is high digital lines and packets switched?

FDDI (again, this is a LAN technology, not WAN)
ISDN (my answer)
ATM (not packet switched. CELLs are used)
Frame Relay

2 routers connected via serial link w/o a DCE...what command do you need to implement?

serial up
line protocol up
clock rate
dce rate
dte rate (my answer)

whats the purpose of DLCI?

identify logical circuits between router and frame relay switch
represents phyiscal address of router attached to frame relay

What command shows RIP routing updates as sent/recv by router

debug ip rip (my answer)
show ip protocols
show ip route rip

If RIP/IGRP/static defined connections are defined, which is used to forward data?


What is true w/ frame relay multipoint subinterfaces?

IP Addy is required on physical interface of central router
All routers fully meshed
All routers must be on the same subnet to forward route updates and broadcasts
Multipoint is definitive controlled

Connectionless net services
non-reliable
reliable
less bandwidth intensive
handshaking

what command do you use to set IGRP metric for speed of link?

config-if> IGRP metric 256k
config-if> metric 256k
config-if> bandwidth 256
config> IGRP metric 256k
config> metric 256k
config> bandwidth 256

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no one has any reply to this?

I would just look it up in a book but i cant find clear set answers for these questions!

Please help me out. I already am CCNA certified, I just want to make sure i have the correct answers for these questions.

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Q1 What command do you use to set IGRP metric for speed of link?

config-if> IGRP metric 256k
config-if> metric 256k
config-if> bandwidth 256 (RIGHT ANS)
config> IGRP metric 256k
config> metric 256k

Q2 What is true w/ frame relay multipoint subinterfaces?

ANS: MULTIPOINT IS THE DEFAULT CONFIG FOR FRAME RELAY SUBINTERFACES


ANSWERED BY DIPESH VIRCHAND

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quote:

---

Originally posted by DVirchand
Q1 What command do you use to set IGRP metric for speed of link?

config-if> IGRP metric 256k
config-if> metric 256k
config-if> bandwidth 256 (RIGHT ANS)
config> IGRP metric 256k
config> metric 256k

Q2 What is true w/ frame relay multipoint subinterfaces?

ANS: MULTIPOINT IS THE DEFAULT CONFIG FOR FRAME RELAY SUBINTERFACES


ANSWERED BY DIPESH VIRCHAND

---

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1) two data link encap. : ISDN, one for D channel (LAPD/q.921) and the rest for b channel (LAPB/PPP/HDLC...)

2) IGRP & EIGRP by default uses bandwidth & delay but options are loading, reliability and MTU (MTU in fact won't take into account)

3)ISDN is a switched circuit tech., the correct answer is FR.

4) "If RIP/IGRP/static defined connections are defined, which is used to forward data?"
What does it mean? If a route learnt from all these protocols/static, the longest prefix goes first, if tie, lowest ad.

5)Connectionless net services :
No handshake and path establish required. Non-reliable connection.

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Poor is not a sin, but the rich makes it be sin;
Rich is not supreme, but the poor wishes be supreme.

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Which WAN technology uses two data link encapulations?

ISDN (my answer)

mine too



IGRP uses what for best path determination?

MTU
Cummulative Interface Delay
path bandwidth value, (my answere sir)
reliability from source to destination
link load in bits per second
hold down timers for updates


Which WAN is high digital lines and packets switched?

FDDI (again, this is a LAN technology, not WAN)
ISDN (my answer) [mine too]
ATM (not packet switched. CELLs are used)
Frame Relay



2 routers connected via serial link w/o a DCE...what command do you need to implement?

serial up
line protocol up
clock rate [my answer sir]
dce rate
dte rate (my answer)



whats the purpose of DLCI?

identify logical circuits between router and frame relay switch



What command shows RIP routing updates as sent/recv by router

debug ip rip (my answer) [mine too]




If RIP/IGRP/static defined connections are defined, which is used to forward data?
Static b/c AD is one



Connectionless net services
non-reliable

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quote:

---

Originally posted by pomerol82

4) "If RIP/IGRP/static defined connections are defined, which is used to forward data?"
What does it mean? If a route learnt from all these protocols/static, the longest prefix goes first, if tie, lowest ad.

5)Connectionless net services :
No handshake and path establish required. Non-reliable connection. [/B]

---

4) can you explain this? I dont understand what you exactly mean by longest prefix goes first, then if tie, lowest AD....

5) yes, i know no handshaking and path estab required, but if you look closely, "no handshaking" is not an option

im just confused by their answer choices.

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[QUOTE

If RIP/IGRP/static defined connections are defined, which is used to forward data?
Static b/c AD is one



Connectionless net services
non-reliable [/B][/QUOTE]

Could you explain this whole AD business to me? what does it mean/how do you determine it? I've been looking through my textbook and i dont see it anywhere!

And as far as connectionless net services, the question asks to pick 2...

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Which WAN technology uses two data link encapsulations?
ISDN


IGRP uses what for best path determination?
IGRP metrics are BDRLM -->Bandwidth, Delay, Reliability, Load, MTU
By default Router considers only Bandwidth, Delay. Load and reliability are considered if it configured to do so.


Which WAN is high digital lines and packets switched?
Frame Relay


2 routers connected via serial link w/o a DCE...what command do you need to implement?
Actually you can not have a serial link if there is no DCE. If one end is a DTE then the other end should invariably be DCE. The question is unclear; it should be DCE, if so then it is clock rate.


What’s the purpose of DLCI?
To identify logical circuits between router and frame relay switch. It is locally significant not necessarily be the same with the other side.

What command shows RIP routing updates as sent/recv by router
debug ip rip


If RIP/IGRP/static defined connections are defined, which is used to forward data?
Static (with value 0 or 1), the reason is its low administrative distance (Ad). Static has got an AD of 0 or 1 whereas it is 100 & 120 for IGRP and RIP respectively. Someone asked what is AD...It is the measure of trustworthiness for the routing protocols. For example, a router has got more than one route for a single a destination through different routing protocols say IGRP, RIP...Now the router prefers the best route based whose AD is low. In our case a route generated by the IGRP is the winner!

What is true w/ frame relay multipoint sub interfaces?
All routers must be on the same subnet to forward route updates and broadcasts


Connectionless net services
Non-reliable. eg. UDP...the packets are just flushed out of the interface thinking that someone next might show the actual the route to their destination! TCP is a connection oriented protocol where a session is established "between the source and destination" and remains till the end of the connection...perfect example is SMTP.


What command do you use to set IGRP metric for speed of link?
It is the command issued on the interfaces.
config-if> bandwidth 256

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