642-812 Exam: Building Converged Cisco Multilayer Switched Networks (BCMSN)642-812 Exam: Building Converged Cisco Multilayer Switched Networks (BCMSN)
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QUESTION 33:
Two Certkiller switches are connected via a trunk link. In this network, the original
frame is encapsulated and an additional header is added before the frame is carried
over a trunk link. At the receiving end, the header is removed and the frame is
forwarded to the assigned VLAN. This describes which technology?
A. DISL
B. ISL
C. DTP
D. IEEE 802.1Q
E. MPLS
F. None of the above
Answer: B
Explanation:
Inter-Switch Link Protocol
The Inter-Switch Link (ISL) protocol is a Cisco proprietary method for preserving the
source VLAN identification of frames passing over a trunk link. ISL performs frame
identification in Layer 2 by encapsulating each frame between a header and trailer. Any
Cisco switch or router device configured for ISL can process and understand the ISL
VLAN information. ISL is primarily used for Ethernet media, although Cisco has
included provisions to carry Token Ring, FDDI, and ATM frames over Ethernet ISL. (A
Frame-Type field in the ISL header indicates the source frame type.)
When a frame is destined out a trunk link to another switch or router, ISL adds a 26-byte
header and a 4-byte trailer to the frame. The source VLAN is identified with a 10-bit
VLAN ID field in the header. The trailer contains a cyclic redundancy check (CRC)
value to ensure the data integrity of the new encapsulated frame. Figure 6-3 shows how
Ethernet frames are encapsulated and forwarded out a trunk link. Because tagging
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information is added at the beginning and end of each frame, ISL is sometimes referred
to as double tagging.
QUESTION 34:
The Certkiller core switches use 802.1Q trunks to connect to each other. How does
802.1Q trunking keep track of multiple VLANs?
A. It tags the data frame with VLAN information and recalculates the CRC value
B. It encapsulates the data frame with a new header and frame check sequence
C. It modifies the port index of a data frame to indicate the VLAN
D. It adds a new header containing the VLAN ID to the data frame
E. None of the above
Answer: A
Explanation:
The IEEE 802.1Q protocol can also carry VLAN associations over trunk links. However,
this frame identification method is standardized, allowing VLAN trunks to exist and
operate between equipment from multiple vendors.
In particular, the IEEE 802.1Q standard defines an architecture for VLAN use, services
provided with VLANs, and protocols and algorithms used to provide VLAN services.
Like Cisco ISL, IEEE 802.1Q can be used for VLAN identification with Ethernet trunks.
Instead of encapsulating each frame with a VLAN ID header and trailer, 802.1Q embeds
its tagging information within the Layer 2 frame. This method is referred to as
single-tagging or internal tagging.
802.1Q also introduces the concept of a native VLAN on a trunk. Frames belonging to
this VLAN are not encapsulated with any tagging information. In the event that an end
station is connected to an 802.1Q trunk link, the end station can receive and understand
only the native VLAN frames. This provides a simple way to offer full trunk
encapsulation to the devices that can understand it, while giving normal access stations
some inherent connectivity over the trunk.
QUESTION 35:
Refer to the following exhibits:
Exhibit #1:
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Exhibit #2:
Study the exhibits carefully. The switchport output in Exhibit #1 displays the
default settings of interface FastEthernet 0/13 on switch Certkiller 1. Figure 2
displays the desired interface settings. Which command sequence would configure
interface FastEthernet 0/13 as displayed in Exhibit #2?
A. Certkiller 1(config-if)# switchport trunk encapsulation dot1q
Certkiller 1(config-if)# switchport mode dynamic auto
Certkiller 1(config-if)# switchport trunk native DATA
Certkiller 1(config-if)# switchport trunk allowed vlan add 1,10,20
B. Certkiller 1(config-if)# switchport trunk encapsulation dot1q
Certkiller 1(config-if)# switchport mode dynamic desirable
Certkiller 1(config-if)# switchport trunk native vlan DATA
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Certkiller 1(config-if)# switchport trunk allowed vlan 1,10,20
C. Certkiller 1(config-if)# switchport trunk encapsulation dot1q
Certkiller 1(config-if)# switchport mode trunk
Certkiller 1(config-if)# switchport trunk native DATA
Certkiller 1(config-if)# switchport trunk allowed vlan 1,10,20
D. Certkiller 1(config-if)# switchport trunk encapsulation dot1q
Certkiller 1(config-if)# switchport mode dynamic desirable
Certkiller 1(config-if)# switchport trunk native vlan 10
E. Certkiller 1(config-if)# switchport trunk encapsulation dot1q
Certkiller 1(config-if)# switchport mode dynamic desirable
Certkiller 1(config-if)# switchport trunk native vlan 10
Certkiller 1(config-if)# switchport trunk allowed vlan 1,10,20
Answer: E
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