Q: why are switch trunking modes ( dynamic auto , dynamic
desirable )used in switch while trunking? if only
negotiation is the factor it can be done with one mode as
well ie dynamic desirable . but why we need dynamic auto.
coz it dsnt negotiates ..at all
please post answer asap
thanks :
- 2 Answers
- 9330 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / jijiisme
both two mode are administrative mode. just for
administrative purpose only. this mean not really run for
the real because of security reason. I can explain how each
mode work.
dynamic desirable : initiates negotiation messages and
responds to negotiation messages to dynamically choose
whether to start using trunking, and defines the trunking
encapsulation.
I refer this definition form ICND2 book. the simple meaning
is the interface that used "dynamic desirable mode" is
define the encapsulation or protocol ( 802.1q or ISL). ISL
is not support now. so only one 802.1q left. So we can
simply define this mode is leader mode decision maker mode.
ok so the rest mode
dynamic auto : Passively waits to receive trunk negotiation
messages,at which point the switch will respond and
negotiate whether to use trunking, and if so, the type of
trunking.
I also refer this for ICND2 book.
this "dynamic auto" mean follower mode. right, that is
really simple.
when two interface connect one interface must be leader and
another must be follower : this condition is only for
administrative only.
in real word the mode "trunk" and protocol is defined by
admin for security purpose.
| Is This Answer Correct ? | 3 Yes | 0 No |
7. What is an advantage to using switches in your network? A. Addressing of hosts by DHCP B. Ease of administration C. Stops broadcast storms D. Works like a repeater
Which OSI Reference Layer is concerned with logical addressing? A.) Network B.) Transport C.) Datalink D.) Physical E.) Session
What is the purpose and default value of the CDP timer command? A.) 90 seconds; interval before an entry expires B.) 60 seconds; interval between updates C.) 60 seconds; interval before an entry expires D.) 90 seconds; interval between updates
What is the function of a router?
what are loops in switches excactly...and how does it gets created???
What cable called v.35?
How many types of router?
Which OSI layer provides mechanical, electrical, procedural for activating, maintaining physical link? A.) Presentation B.) Network C.) Application D.) Physical E.) Transport F.) Data-Link
Which of the following will show an extended access list 150? A.) sh access-list B.) sh ip int C.) sh ip access-list 150 D.) sh access-list 150 extended
Which of the following use PVCs at layer 2? A.) X.25 B.) HDLC C.) Frame relay D.) ISDN
What is the purpose of Split Horizon? A.) It prevents the regular update messages from reinstating a route that has gone down B.) Information received on an interface cannot be sent back out the same interface C.) Informs all neighbor routers that two routes exist D.) Tells the router the destination is unreachable
What is the size of an ip address?
CCNA 
