VLAN Trunking Questions 3
Here you will find answers to VLAN Trunking Questions – Part 3
Question 1
Which configuration option will cause the link between two Cisco 3600 Series Multiservice Platforms to become a functional trunk?
A. switchport dynamic auto switchport dynamic auto
B. switchport access vlan 10
switchport mode dynamic desirable
C. switchport mode trunk switchport nonegotiate
D. Leave both ports with the default trunk settings.
Answer: D
Question 2
If you were to set up a VLAN trunk over a Fast Ethernet link on switch R1, which trunk mode would you set the local port to on R1 if you wanted it to respond to requests from its link partner (R2) and become a trunk?
A. Auto
B. Negotiate
C. Designate
D. Nonegotiate
Answer: A
Question 3
Which two statements are true about best practices in VLAN design? (Choose two)
A. Routing should occur at the access layer if voice VLANs are utilized. Otherwise, routing should occur at the distribution layer.
B. Routing may be performed at all layers but is most commonly done at the core and distribution layers.
C. Routing should not be performed between VLANs located on separate switches.
D. VLANs should be local to a switch.
E. VLANs should be localized to a single switch unless voice VLANs are being utilized.
Answer: B D
Question 4
You need to configure a new Company switch to support DTP. Which DTP switchport mode parameter sets the switch port to actively send and respond to DTP negotiation frames?
A. Access
B. Nonegotiate
C. Trunk
D. Dynamic desirable
E. Dynamic auto
Answer: D
Question 1 is incorrect, cause, the default setting is dynamica auto.
Joyce, you are wrong. Default mode is dynamic desirable. Go and make a double check before you go and state someone is wrong. Cheers.
@joyce and @ciscocro you both are correct because some switches desirable is default and some switches auto is the default mode ex:3550-desirable is default and 3560-auto si default.
so you need to learn what are the default settings for each cisco device model???
Dear Sir, I am from Chennai,Indian. I am able to understand what you say.. Any way if we remember the fact that dynamic desirable —Dynamic auto , dynamic desirable —–Trunk types of DTP modes between switch enables the trunking between switch , we can be confident that option D is absolutely correct one and that is what is mentioned ! !
Please correct me if i misunderstood !.
I’ve seen DELL switches and cisco switches if default are not changed they do form a trunk if a switch is connected on the other end :)
ps. SWITCH exam is based on 3600 series switches
I do a lot of work on the ine CCIE racks. I can tell u from experience that 3550s are dynamic auto and 3560s are dynamic desirable by default.
i could have that the wrong way round…
http://cciepursuit.wordpress.com/2007/06/12/cisco-35503560-dtp-defaults/
3550 default = dynamic desirable
3560 default = dynamic auto
So, yes, I guess we do need to remember what the defaults are for each switch type! :-(
I think in this question, none of the other configs will work, so you are only left with option D, so you have to assume they mean the switch is 3550.
A – not correct command
B – switchport is put into access mode, not trunk (and not correct commands anyway)
C – nonegotiate will turn OFF DTP
Q1 – B is correct, because on Switch A only “switchport access vlan 10″ and the switchport mode was not changed with “switchport mode access”.
-> SwitchA: switchport mode dynamic auto
-> SwitchB: switchport mode dynamic desirable
->> DTP forms trunk port
Ya, Answer B is right, Cisco has mentioned in its document that Catalyst 3500 catalyst 3600 series and 2900 series all have their port in dynamic auto by default….
http://www.cisco.com/en/US/docs/ios/12_2t/inter/command/reference/irftsto.html
Question 1 is D! Read: “Defaults
Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
The default is access mode.
Catalyst Switches
The default mode is dependent on the platform; it should be either dynamic auto for platforms that are intended as wiring closets or dynamic desirable for platforms that are intended as backbone switches. The default for PVLAN ports is that no mode is set.”
The 3600 is a back bone switch and thus the default mode is dynamic desirable.
Q1 why not C? If you configured both switches with trunk an nonegotiate, they will still form trunk.
Q1 – C.
Q3 on test today
Q3 was in test today
Q1. The answer got to be C.
“Cisco states”
For best practice between trunk links, the port should be configured as Trunk and nonegotiate, to prevent attacks.
Is it possible to established trunking negotiation between two switches with different tagging/encapsulation mode? One is set to 802.1q and the other to ISL?
@StayingPerfect4U you canot establish a trunk link when one is set to dot1Q and one to ISL. simply because they use different frame sizes, types, encapsulation. ISL totally reencapsulate the frame while dot1Q add headers. Read more…
Q1 Anser B is correct for me.
Anonimous said:
because on Switch A only “switchport access vlan 10″ and the switchport mode was not changed with “switchport mode access”.
-> SwitchA: switchport mode dynamic auto (default setings)
-> SwitchB: switchport mode dynamic desirable
->> DTP forms trunk port
This explanation is correct, this cause form trunk dinamic.