VLAN Trunking
Question 1
Explanation
These errors are generated because the native VLAN is not matched on the two switches (the native VLAN on SW-1 is not the default native VLAN 1 while the native VLAN on the other side is VLAN 1). The errors indicate that spanning tree has detected mismatched native VLANs and has shut down VLAN 1 on the trunk.
We should verify that the configurations of the native VLAN ID is consistent on the interfaces on each end of the IEEE 802.1Q trunk connection. When the configurations are consistent, spanning tree automatically unblocks the interfaces.
Question 2
Explanation
In 802.1Q, the trunking device inserts a 4-byte tag into the original frame and recomputes the frame check sequence (FCS) before the device sends the frame over the trunk link. At the receiving end, the tag is removed and the frame is forwarded to the assigned VLAN. 802.1Q does not tag frames on the native VLAN. It tags all other frames that are transmitted and received on the trunk.
Reference: http://www.cisco.com/c/en/us/support/docs/lan-switching/8021q/17056-741-4.html
Question 3
Explanation
802.1Q is a industry standards based implementation of carrying traffic for multiple VLANs on a single trunking interface between two Ethernet switches. 802.1Q is for Ethernet networks only.
Question 4
Explanation
We can use the “switchport trunk allowed vlan ” to specify which VLANs are allowed to go through. Other VLANs will be dropped.
Question 5
Explanation
Manually configure trunking with the “switchport mode trunk” command and manually configure access interfaces with the “switchport mode access” prevent auto trunking on that interface.
Disable DTP with the “switchport nonegotiate” so that DTP messages are not advertised out of the interface is also a good way to prevent auto trunking.
Question 6
Explanation
There are two protocols that can be used for trunking: Inter-Switch Link (ISL) and 802.1Q. We can choose which protocol to run by the “switchport trunk encapsulation “. After that we can configure trunking mode with the “switchport mode trunk” command.
In fact this question is not clear and may cause confusion because Dynamic Trunking Protocol (DTP) is the protocol that can automatically negotiate for trunking.
Note: The DTP options can be dynamic auto, dynamic desirable, and trunk.
Question 7
Explanation
By default all VLANs are allowed to go through a trunk but if we apply the “switchport trunk allowed vlan ” then only these VLANs are allowed to go through, other VLANs are dropped so be careful when limiting VLANs on the trunks with this command.
Question 8
Explanation
We can use the “switchport trunk allowed vlan ” to specify which VLANs are allowed to go through. Other VLANs will be dropped.
Question 9
Explanation
First we will explain these two commands:
| switchport access vlan 10 switchport mode trunk |
The first command is used for an access port whist the second is used for a trunk so why are they here at the same time? In fact this interface was set as a trunk. The “switchport access vlan 10” is still there but it does not affect the operational mode of the port -> Gi1/0/1 is a trunk port so it will not appear in the “show vlan” command.
The “switchport voice vlan 11” command here only tries to confuse you. But it does have an effect on the port: Cisco uses CDP to specify a Cisco IP Phone and will automatically place that traffic into the voice VLAN. For example if we configure like this:
| interface fa0/0 switchport trunk encapsulation dot1q switchport mode trunk switchport voice vlan 11 |
Then the voice traffic from a Cisco IP Phone will be placed into VLAN 11.
Note: In the above configuration, the data and voice use the same interface fa0/0 so it should be configured as a trunk link.
(Reference: http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_example09186a0080722cdb.shtml)
Question 10
Explanation
VLAN 1 is always used for CDP, VTP, PAgP traffic (except DTP uses native VLAN) even if VLAN 1 is not the native VLAN. If VLAN 1 is not the native VLAN then CDP, VTP, PAgP traffic will be tagged on the trunk.
In this question, after changing the default native VLAN to 999 while keeping the standard configuration on the other end, we cause a “native VLAN mismatched” error. Besides, CDP, VTP traffic is tagged on the local switch (as VLAN 1 is no longer the native VLAN) so the other end cannot understand them -> CDP, VTP traffic is dropped.
Question 11
Need YOUR HELP
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They give the test questions, answers and simulations with additional resources if you pay the mone y to be a member. I have not found the pdf so im studying by notes and the simulations on site. took me 2 years before i paid these dudes but i do now feel its worth the money. give it a try
I am really confused about question 9 I manually entered the commands in packet tracer as shown in the exhibit and the outpout shows that the interface shows up in both Vlan 10 and Vlan 11:
show vlan
VLAN Name Status Ports
—- ——————————– ——— ——————————-
1 default active Fa0/2, Fa0/3, Fa0/4, Fa0/5
Fa0/6, Fa0/7, Fa0/8, Fa0/9
Fa0/10, Fa0/11, Fa0/12, Fa0/13
Fa0/14, Fa0/15, Fa0/16, Fa0/17
Fa0/18, Fa0/19, Fa0/20, Fa0/21
Fa0/22, Fa0/23, Fa0/24, Gig0/1
Gig0/2
10 VLAN0010 active Fa0/1
11 VLAN0011 active Fa0/1
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
interface FastEthernet0/1
switchport access vlan 10
switchport trunk encapsulation dot1q
switchport mode trunk
switchport voice vlan 11
spanning-tree portfast
!
How then, when it clearly shows that the interface would be placed in the vlans would this be wrong? Can someone please clarify this?
Ok, nevermind. I ran the same commands in GNS3 and the vlan output shows that the Interface dosn’t show up:
vIOS-L2-01#show vlan
VLAN Name Status Ports
—- ——————————– ——— ——————————-
1 default active Gi0/0, Gi0/2, Gi0/3, Gi1/0
Gi1/1, Gi1/2, Gi1/3
10 VLAN0010 active
11 VLAN0011 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
interface Gigabitethernet 0/1
switchport access vlan 10
switchport trunk encapsulation dot1q
switchport mode trunk
switchport voice vlan 11
spanning-tree portfast
!
I am assuming that Packet Tracer has a bug in it, and that the devs got it right. Sorry about the confusion.
Hello… Can someone confirm is studying this page ( 9tut ) is enough to pass the SW 300-115 exam ?
Yes CCNP boy but get a fresh dump some drag and drops are not here and a few questions
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What will be the behavior of an access port when a tagged packet is received, with a VLAN ID of an access port?
A. The tag is removed and packet is forwarded to a VLAN of access port
B. The tag is removed and packet is forwarded of the VLAN mentioned in the tag.
C. The tag is not removed and packet is forwarded of the VLAN mentioned in the tag.
D. Packet is dropped.
Can some help with this?
@certprepare
The link for vlan trunking is showing vlan trunking 2 questions
Can u please fix it?
If an access port receives a packet with an 802.1Q tag in the header other than the access VLAN value, that port drops the packet without learning its MAC source address.
https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/layer2/b_Cisco_Nexus_5000_Series_NX-OS_/Cisco_Nexus_5000_Series_NX-OS__chapter6.html
What will be the behavior of an access port when a tagged packet is received, with a VLAN ID of an access port?
A. The tag is removed and packet is forwarded to a VLAN of access port
B. The tag is removed and packet is forwarded of the VLAN mentioned in the tag.
C. The tag is not removed and packet is forwarded of the VLAN mentioned in the tag.
D. Packet is dropped.
The Answer: A
Q10 the answers do not match the explanation. Answer should be native vlan mismatch or something along those line.
@YMD I completely agree. It doesn’t matter that the native VLAN isn’t present on the trunk as the VTP and CDP traffic is still being sent but dropped at the other end because of the mismatch.
Hi
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my mail : ali_luay_92 at yahoo dot com
Q9 .I have got the following output :
s1(config-if)#sw acc vlan 10
s1(config-if)#sw tr enc dot1q
s1(config-if)#sw mode tr
s1(config-if)#sw voice vlan 11
% Voice VLAN does not exist. Creating vlan 11
s1(config-if)#
s1(config-if)#span
s1(config-if)#spanning-tree prt
s1(config-if)#spanning-tree port
s1(config-if)#spanning-tree portfast
s1(config-if)#end
s1#sh vlan
VLAN Name Status Ports
—- ——————————– ——— ——————————-
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4, Fa0/5, Fa0/6
Fa0/7, Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20, Fa0/21
Fa0/22
10 VLAN0010 active Fa0/23, Gi0/2
11 VLAN0011 active Gi0/2
20 VLAN0020 active Fa0/24
1002 fddi-default act/unsup
1003 trcrf-default act/unsup
1004 fddinet-default act/unsup
1005 trbrf-default act/unsup
This is from a real c3560 switch
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Q9 & Q10 answers are very strange because:
Q9: GNS3 can show anythink but on real SW (es. Cisco 4500) the correct answer is B. Also if it’s configured and work like a trunk, the show vlan command show the access port and the voice port on configured vlan.
Q10: Correct answer is E; normally with mode trunk enabled the native vlan 1 is already on trunk. In this case, changing the default native vlan to 999, the control traffic must be manually enabled on the new native vlan 999 with “switchport trunk native vlan 999” command on both peers oh the connection. On the answer there is not “on both peers….”.
Why are all questions deleted? Do I need premium access or is this some kind of legal problem?
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