Exam Number/Code: 642-812
Exam Name: BCMSN – Building Converged Cisco Multilayer Switched Networks
VUE Code: 642-812
Questions Type: Single choice,
Exam Language(s): English
“BCMSN – Building Converged Cisco Multilayer Switched Networks”, also known as 642-812 exam, is a Cisco certification.
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With the complete collection of questions and answers Q&as with Expert Explanations, Pass4sure has assembled to take you through 290 Q&As to your 642-812 Exam preparation. In the 642-812 exam resources, you will cover every field and category in CCNP helping to ready you for your successful Cisco Certification.
The Building Converged Cisco Multilayer Switched Networks (BCMSN 642-812) is a qualifying exam for the Cisco Certified Network Professional CCNP® and the Cisco Certified Design Professional CCDP® certifications. The BCMSN 642-812 exam will certify that the successful candidate has important knowledge and skills necessary to implement scalable multilayer switched networks. The exam includes topics on Campus Networks, describing and implementing advanced Spanning Tree concepts, VLANs and Inter-VLAN routing, High Availability, Wireless Client Access, Access Layer Voice concepts, and minimizing service Loss and Data Theft in a Campus Network.
QUESTION 31:
When you’re building up a VLAN on a new PassGuide switch, which of the following
are part of the sequence? (Select all that apply)
A. Assign ports.
B. Create VLAN.
C. Create VLAN naming scheme
D. Configure ports for trunking.
E. Remove the trunk when the trunk is no longer needed.
F. Set the baud rate for ports
G. Verify configuration.
Answer: A, B, E, G
Explanation:
To create VLANs on a Catalyst switch, you must first enable the VLAN Trunking
Protocol (VTP). The switch must be in VTP server or transparent mode to do this. VTP
clients can not create VLANs.
The next step is to create the VLAN.
Once the VLAN is created, the final step is to assign individual ports to the VLAN.
After everything is configured, it should be verified.
Incorrect Answers:
Create VLAN naming scheme: A VLAN naming scheme isn’t necessary because VLANs
are numbered by default when they’re created. Note that A VTP domain name must be
created, but the VLANs themselves are not required to be named.
Set the baud rate for ports: The baud rate doesn’t have to be set for ports. Setting baud
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rate is for out-of-band console connections.
Configure ports for trunking: This is not required as the VLAN ports can be simply
placed into access mode.
QUESTION 32:
Two PassGuide switches are connected together as shown below:
PassGuide 1 configuration exhibit:
PassGuide 2 configuration exhibit:
Based on the information shown above, which three statements are true? (Select
three)
A. DTP packets are sent from Switch PassGuide 2.
B. DTP is not running on Switch PassGuide 1.
C. Only VLANs 1-1001 will travel across the trunk link.
D. A trunk link will be formed.
E. The native VLAN for Switch PassGuide 2 is vlan 1.
Answer: A, D, E
Explanation:
You can manually configure trunk links on Catalyst switches for either ISL or 802.1Q
mode. In addition, Cisco has implemented a proprietary, point-to-point protocol called
Dynamic Trunking Protocol (DTP) that negotiates a common trunking mode between
two switches. The negotiation covers the encapsulation (ISL or 802.1Q) as well as
whether the link becomes a trunk at all.
You can configure the trunk encapsulation with the switchport trunk encapsulation
command, as one of the following:
1. isl-VLANs are tagged by encapsulating each frame using the Cisco ISL protocol.
2. dot1q-VLANs are tagged in each frame using the IEEE 802.1Q standard protocol. The
only exception is the native VLAN, which is sent normally and not tagged at all.
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1. negotiate (the default)-The encapsulation is negotiated to select either ISL or IEEE
802.1Q, whichever is supported by both ends of the trunk. If both ends support both
types, ISL is favored. (The Catalyst 2950 switch does not support ISL encapsulation.)
In the switchport mode command, you can set the trunking mode to any of the following:
1. trunk-This setting places the port in permanent trunking mode. The corresponding
switch port at the other end of the trunk should be similarly configured because
negotiation is not allowed. You should also manually configure the encapsulation mode.
2. dynamic desirable (the default)-The port actively attempts to convert the link into
trunking mode. If the far-end switch port is configured to trunk, dynamic desirable,
or dynamic auto mode, trunking is successfully negotiated.
3. dynamic auto-The port converts the link into trunking mode. If the far-end
switch port is configured to trunk or dynamic desirable, trunking is negotiated.
Because of the passive negotiation behavior, the link never becomes a trunk if both
ends of the link are left to the dynamic auto default.
QUESTION 33:
Two PassGuide 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 PassGuide 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 PassGuide 1. Figure 2
displays the desired interface settings. Which command sequence would configure
interface FastEthernet 0/13 as displayed in Exhibit #2?
A. PassGuide 1(config-if)# switchport trunk encapsulation dot1q
PassGuide 1(config-if)# switchport mode dynamic auto
PassGuide 1(config-if)# switchport trunk native DATA
PassGuide 1(config-if)# switchport trunk allowed vlan add 1,10,20
B. PassGuide 1(config-if)# switchport trunk encapsulation dot1q
PassGuide 1(config-if)# switchport mode dynamic desirable
PassGuide 1(config-if)# switchport trunk native vlan DATA
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PassGuide 1(config-if)# switchport trunk allowed vlan 1,10,20
C. PassGuide 1(config-if)# switchport trunk encapsulation dot1q
PassGuide 1(config-if)# switchport mode trunk
PassGuide 1(config-if)# switchport trunk native DATA
PassGuide 1(config-if)# switchport trunk allowed vlan 1,10,20
D. PassGuide 1(config-if)# switchport trunk encapsulation dot1q
PassGuide 1(config-if)# switchport mode dynamic desirable
PassGuide 1(config-if)# switchport trunk native vlan 10
E. PassGuide 1(config-if)# switchport trunk encapsulation dot1q
PassGuide 1(config-if)# switchport mode dynamic desirable
PassGuide 1(config-if)# switchport trunk native vlan 10
PassGuide 1(config-if)# switchport trunk allowed vlan 1,10,20
Answer: E
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