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NP > VLAN Trunking > Flashcards

VLAN Trunking Flashcards

Study Trunking

1
Q

-SW-1#sh logging
-%SPANTREE-SP-2-RECV_PVID_ERR: Received BPDU with inconsistent peer
-Vlan id 1 on GigabitEthernet1/2 VLAN2013.
-%SPANTREE-SP-2-BLOCK_PVID_PEER: Blocking GigabitEthernet1/2 on VLAN0001. Inconsistent peer vlan.
———————————–
A multilayer switch has been configured to send and receive encapsulated and tagged frames. VLAN 2013 on the multilayer switch is configured as the native VLAN. Which option is the cause of the spanning-tree error?
A. VLAN spanning-tree in SW-2 is configured.
B. spanning-tree bpdu-filter is enabled.
C. 802.1q trunks are on both sides, both with native VLAN mismatch.
D. VLAN ID 1 should not be used for management traffic because its unsafe.

A

C. 802.1q trunks are on both sides, both with native VLAN mismatch.

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2
Q 
------------------------
3512xl(config)#int fastEthernet 0/1 
3512xl(config-if)#switchport mode trunk
3512xl(config-if)#switchport trunk encapsulation dot1q
------------------------
How many bytes are added to each frame as a result of the configuration?
A. 4-bytes except the native VLAN 
B. 8-bytes except the native VLAN 
C. 4-bytes including native VLAN 
D. 8-bytes including native VLAN
A

A. 4-bytes except the native VLAN

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3
Q

A network engineer must implement Ethernet links that are capable of transporting frames and IP traffic for different broadcast domains that are mutually isolated. Consider that this is a multivendor environment. Which Cisco IOS switching feature can be used to achieve the task?
A. PPP encapsulation with a virtual template
B. Link Aggregation Protocol at the access layer
C. dot1q VLAN trunking
D. Inter-Switch Link

A

C. dot1q VLAN trunking

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4
Q 
Which technique allows specific VLANs to be strictly permitted by the administrator?
A. VTP pruning
B. transparent bridging
C. trunk allowed VLANs
D. VLAN access-list
E. L2P tunneling
A

C. trunk allowed VLANs

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5
Q

For security reasons, the IT manager has prohibited users from dynamically establishing trunks with their associated upstream switch. Which two actions can prevent interface trunking? (Choose two)
A. Configure trunk and access interfaces manually.
B. Disable DTP on a per interface basis.
C. Apply BPDU guard and BPDU filter.
D. Enable switchport block on access ports.

A

A. Configure trunk and access interfaces manually.

B. Disable DTP on a per interface basis.

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6
Q 
Which two protocols can be automatically negotiated between switches for trunking? (Choose two)
A. PPP
B. DTP
C. ISL
D. HDLC
E. DLCI
F. DOT1Q
A

C. ISL

F. DOT1Q

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7
Q

The network manager has requested that several new VLANs (VLAN 10, 20, and 30) are allowed to traverse the switch trunk interface. After the command ―switchport trunk allowed vlan 10,20,30 is issued, all other existing VLANs no longer pass traffic over the trunk. What is the root cause of the problem?
A. The command effectively removed all other working VLANs and replaced them with the new VLANs.
B. VTP pruning removed all unused VLANs.
C. ISL was unable to encapsulate more than the already permitted VLANs across the trunk.
D. Allowing additional VLANs across the trunk introduced a loop in the network.

A

A. The command effectively removed all other working VLANs and replaced them with the new VLANs.

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8
Q 
A manager tells the network engineer to permit only certain VLANs across a specific trunk interface. Which option can be configured to accomplish this?
A. allowed VLAN list
B. VTP pruning
C. VACL
D. L2P tunneling
A

A. allowed VLAN list

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9
Q

Which command is used to verify trunk native VLANs?
A. show access ports
B. show interfaces trunk
C. show ip interface brief

A

B. show interfaces trunk

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10
Q

Which two statements about 802.1 q are true? (Choose two)
A. It supports 8-byte VLAN identifiers.
B. It adds a 32-bit field to the Ethernet frame between the source MAC address and length.
C. When it is enabled, it forces a recalculation of the frame-check sequence field.
D. It increases the maximum size of an Ethernet frame to 1594 bytes.
E. It encapsulates the original Ethernet frame and adds a VLAN identifier.
F. It is a Cisco proprietary protocol.

A

B. It adds a 32-bit field to the Ethernet frame between the source MAC address and length.
C. When it is enabled, it forces a recalculation of the frame-check sequence field.

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11
Q 
Which option is the minimum frame size for an 802.1Q frame?
A. 64 bytes
B. 68 bytes
C. 1518 bytes
D. 1522 bytes
A

B. 68 bytes

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12
Q 
Which option is the maximum frame size for an 802.1Q frame?
A. 64 bytes
B. 68 bytes
C. 1518 bytes
D. 1522 bytes
A

D. 1522 bytes

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13
Q

EXHIBIT – switchport trunk allowed vlan 1,80,99-250
Which two commands will remove VLAN 100 from the allowed VLAN list? (Choose two)
A. switchport trunk allowed vlan remove 100
B. switchport trunk allowed vlan 1-80,99,101-250
C. switchport trunk allowed vlan except vlan 100

A

A. switchport trunk allowed vlan remove 100

B. switchport trunk allowed vlan 1-80,99,101-250

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14
Q 
What is the value of the TPID/tag protocol identifier of QinQ?
A. 0x88a8
B. 0x8100
C. 0x8b45
D. 0x8200
A

A. 0x88a8

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15
Q 
What is the value of the TPID/tag protocol identifier in dot1Q?
A. 0x8100
B. 0x8a88
C. 0x8b45
D. 0x8200
A

A. 0x8100

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16
Q

Which two commands are used to remove VLAN 55 from the trunk port? (Choose two)
A. switchport trunk allowed vlan add 3, remove 55
B. switchport trunk allowed vlan remove 55
C. switchport trunk allowed vlan except 55

A

B. switchport trunk allowed vlan remove 55

C. switchport trunk allowed vlan except 55

17
Q

!—————-
interface GigabitEthernet2/0/1
switchport access vlan 700
switchport trunk allowed vlan 200,300,700
switchport mode trunk
end
!——————
Refer to the exhibit. Which statement about the current configuration on port GigabitEthernet2/0/1 is true?
A. It is an access port configured for a phone and a PC
B. It is a trunk port and the native VLAN is VLAN1
C. It is a trunk port and the native VLAN is VLAN 700
D. It is an access port in VLAN 700

A

B. It is a trunk port and the native VLAN is VLAN1

18
Q

A switch has been configured with the vlan dot1q tag native command. Which statement describes what the switch does with untagged frames that it receive?
A. Untagged frames are forwarded via the default VLAN
B. It drops the untagged frames
C. The trunked port is put in err-disable state
D. Untagged frames are forwarded via the native VLAN

A

B. It drops the untagged frames

I dont know about this one Tommy…

19
Q 
Which two DTP negotiated interface mode combinations negotiate to form an access port? (Choose two)
A. Dynamic desirable and Dynamic Auto
B. Dynamic Desirable and access
C. Dynamic auto and Dynamic auto
D. Nonegotiate and trunk
E. Dynamic auto and trunk
A

B. Dynamic Desirable and access

C. Dynamic auto and Dynamic auto

20
Q

Which two configurations can you apply to a port so that it tags traffic with VLAN 915?
(Choose two)?

B.
interface GigabitEthernet0/0
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 915
D.
interface GigabitEthernet0/0.915
encapsulation dot1q 915
A 
B.
interface GigabitEthernet0/0
switchport mode trunk
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 915
D.
interface GigabitEthernet0/0.915
encapsulation dot1q 915
21
Q 
How can you set VLAN 99 on a trunk to become a native VLAN?
A. switchport trunk native vlan 99
B. switchport trunk vlan 99 native
C. switchport native vlan 99 trunk
D. switchport native trunk vlan 99
E. switchport vlan 99 native
F. switchport vlan native trunk 99
A

A. switchport trunk native vlan 99

22
Q 
If VLAN 99 is set to trunk, how can you set it to untagged from trunk VLAN 99?
A. switchport access vlan 99
B. switchport vlan 99 access
C. switchport vlan 99 allow access
D. switchport allow access vlan 99
A

A. switchport access vlan 99

23
Q

Which command configures VLAN 99 as an untagged VLAN on a trunk?
A. switchport access vlan 99
B. switchport trunk pruning vlan except 99
C. switchport trunk allowed vlan 99
D. switchport trunk native vlan 99

A

D. switchport trunk native vlan 99

24
Q

switchport trunk allowed vlan 81-97,99-121
—-
How can you remove vlan 100 from the allowed vlan list? (Choose two)
A. switchport trunk allowed vlan 81-121 remove 98,100
B. switchport trunk allowed vlan remove 100
C. switchport trunk allowed vlan 81-97,99,101-121

A

B. switchport trunk allowed vlan remove 100

C. switchport trunk allowed vlan 81-97,99,101-121

25
Q

Refer to the output below. Which two effects of this configuration are true? (Choose two)
!
interface GigabrtEthernet1/1
description to Accounting Floor A1460-516
switchportswitchport trunk encapsulation dotlq
switchport trunk allowed vlan 2,4,6,8
switchport trunk native vlan 2
switchport mode trunk
end
!
A. The device adds an 8-byte VLAN tag to data to VLAN 2.
B. Data on VLAN 2 remains untagged.
C. Data on VLANs 4,6, and 8 remains untagged.
D. The device adds a 4-byte VLAN tag to data on VLAN 2 only.
E. The switch adds a 4-byte VLAN tag to data on VLANs 4, 6 and 8.

A

B. Data on VLAN 2 remains untagged.

E. The switch adds a 4-byte VLAN tag to data on VLANs 4, 6 and 8.

26
Q

Which statement describes what a port that is configured as an access port does if it receives an 802.1Q tagged frame?
A. It drops the frame
B. It passes the frame on to the VLAN that the frame is tagged for.
C. It err-disables the port.
D. It removes the tag and forwards the frame in the VLAN assigned to the port

A

A. It drops the frame

27
Q

Which two requirements for dot1q trunking in IOS are true? (Choose two)
A. the native VLAN must have the same number on each side of the link
B. Spanning-tree PortFast must be enabled
C. The encapsulation protocol must be the same on each end of the trunk
D. MST must be running if extended VLANs are in use
E. ISL must be enabled on the same link

A

A. the native VLAN must have the same number on each side of the link
C. The encapsulation protocol must be the same on each end of the trunk

28
Q

Which two statements about 802.1Q are true? (Choose two)
A. The header is found within the Ethernet trailer.
B. Each frame contains a 12-byte VLAN identifier field.
C. When it is enabled, the minimum Ethernet frame size is 68 bytes.
D. It inserts a 4-bytes tag field to the Ethernet frame.
E. Trunking devices add an 8-byte VLAN tag to all VLAN packets.

A

C. When it is enabled, the minimum Ethernet frame size is 68 bytes.
D. It inserts a 4-bytes tag field to the Ethernet frame.

NP (21 decks)

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