Question 1Which 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.
Answer: B C
Explanation
The 802.1q frame format is same as 802.3. The only change is the addition of 4 bytes (32 bits) fields. That additional header includes a field with which to identify the VLAN number. Because inserting this header changes the frame, 802.1Q encapsulation forces a recalculation of the original FCS field in the Ethernet trailer.
Question 2
Which option is the minimum frame size for an 802.1Q frame?
A. 64 bytes
B. 68 bytes
C. 1518 bytes
D. 1522 bytes
Answer: B
Question 3
Which option is the maximum frame size for an 802.1Q frame?
A. 64 bytes
B. 68 bytes
C. 1518 bytes
D. 1522 bytes
Answer: D
Question 4
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
Answer: A B
Question 5
Which two configurations cause the frames to be tagged? (Choose two)
A. interface gi0/1.116
encapsulation dot1q
B. vlan trunk allowed vlan 116
C. interface with access and voice VLAN configured to 116
Answer: A B (?)
Question 6
What is the value of the TPID/tag protocol identifier of QinQ?
A. 0x88a8
B. 0x8100
C. 0x8b45
D. 0x8200
Answer: A
Question 7
What is the value of the TPID/tag protocol identifier in dot1Q?
A. 0x8100
B. 0x8a88
C. 0x8b45
D. 0x8200
Answer: A
Question 8
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
Answer: B C
Question 9
Refer to the exhibit.
| ! 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
Answer: B
Explanation
The “switchport mode trunk” is the most important command to identify if a port is configured in access or trunk mode. In this case because of the “switchport mode trunk” command, the “switchport access vlan 700” does not have any effect.
There is no “switchport trunk native vlan …” command so it is using the default native VLAN, which is 1.