BCMSN – Building Converged Cisco Multilayer Switched Networks : 642-812 Exam
642-812 BCMSN
Building Converged Cisco Multilayer Switched Networks

Exam Number: 642-812
Associated Certifications: CCNP, CCIP, CCDP
Duration: 90 minutes
Available Languages: English
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Exam Description Exam Topics Recommended Training Additional Resources
Exam Description
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.

Exam Topics
The following information provides general guidelines for the content likely to be included on the exam. However, other related topics may also appear on any specific delivery of the exam. In order to better reflect the contents of the exam and for clarity purposes the guidelines below may change at any time without notice.

Implement VLANs.
Explain the functions of VLANs in a hierarchical network.
Configure VLANs (e.g., Native, Default, Static and Access).
Explain and configure VLAN trunking (i.e., IEEE 802.1Q and ISL).
Explain and configure VTP.
Verify or troubleshoot VLAN configurations.

Conduct the operation of Spanning Tree protocols in a hierarchical network.
Explain the functions and operations of the Spanning Tree protocols (i.e., RSTP, PVRST, MISTP).
Configure RSTP (PVRST) and MISTP.
Describe and configure STP security mechanisms (i.e., BPDU Guard, BPDU Filtering, Root Guard).
Configure and Verify UDLD and Loop Guard.
Verify or troubleshoot Spanning Tree protocol operations.
Configure and verify link aggregation using PAgP or LACP.

Implement Inter-VLAN routing.
Explain and configure Inter-VLAN routing (i.e., SVI and routed ports).
Explain and enable CEF operation.
Verify or troubleshoot InterVLAN routing configurations.

Implement gateway redundancy technologies.
Explain the functions and operations of gateway redundancy protocols (i.e., HSRP, VRRP, and GLBP).
Configure HSRP, VRRP, and GLBP.
Verify High Availability configurations.

Describe and configure wireless client access.
Describe the components and operations of WLAN topologies (i.e., AP and Bridge).
Describe the features of Client Devices, Network Unification, and Mobility Platforms (i.e., CCX, LWAPP).
Configure a wireless client (i.e., ADU).

Describe and configure security features in a switched network.
Describe common Layer 2 network attacks (e.g., MAC Flooding, Rogue Devices, VLAN Hopping, DHCP Spoofing, etc.)
Explain and configure Port Security,802.1x, VACLs, Private VLANs, DHCP Snooping, and DAI.
Verify Catalyst switch (IOS-based) security configurations (i.e., Port Security, 802.1x, VACLs, Private VLANs, DHCP Snooping, and DAI).

Configure support for voice.
Describe the characteristics of voice in the campus network.
Describe the functions of Voice VLANs and trust boundaries.
Configure and verify basic IP Phone support (i.e. Voice VLAN, Trust and CoS options, AutoQoS for voice).

Exam Number/Code: 642-812
Exam Name:BCMSN – Building Converged Cisco Multilayer Switched Networks

“BCMSN – Building Converged Cisco Multilayer Switched Networks”, also known as 642-812 exam, is a Cisco certification. With the complete collection of questions and answers, Actualtests has assembled to take you through 346 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.
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Exam DetailsThe 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.

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QUESTION 11:
What are some virtues of implementing end-to-end VLANs? (Choose two)
A. End-to-end VLANs are easy to manage.
B. Users are grouped into VLANs independent of a physical location.
C. Each VLAN has a common set of security and resource requirements for all members.
D. Resources are restricted to a single location.
Answer: B, C
Explanation:
In an end-to-end VLAN, users are grouped into VLANs independent of physical location
and dependent on group or job function.
Each VLAN has a common set of security requirements for all members.
Incorrect Answers:
A: End to end VLANs are more difficult to manage than local VLANs, due to the
physical distances that they can span.
D: In an end-to-end VLAN, network resources are generally distributed across the entire
enterprise wide area network.
QUESTION 12:
Which of the following statements is true about the 80/20 rule (Select all that
apply)?
A. 20 percent of the traffic on a network segment should be local
B. no more than 20 percent of the network traffic should be able to move across a
backbone.
C. no more than 80 percent of the network traffic should be able to move across a
backbone.
D. 80 percent of the traffic on a network segment should be local
Answer: B, D
Explanation:
The 80/20 rule in network design originated from the idea that most of the traffic should
remain local to the LAN, since bandwidth is plentiful compared to WAN links, and a
great deal of broadcast traffic that is evident at the LAN is not passed over the backbone.
Note: With the availability of inexpensive bandwidth and centralized data centers, this
rule appears to have become obsolete. In fact, most networks have taken on the 20/80
rules, as opposed to the legacy 80/20 rule.
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QUESTION 13:
Which two factors give merit to the 20/80 LAN traffic model? (Select two)
A. The Internet
B. Local servers
C. Server farms
D. Localized applications
E. More powerful desktop PC’s
Answer: A, C
Explanation:
Remote services (server farms, Internet, etc.) are factors
which contributed to increased backbone traffic.
Also consider:
This geographic location can be as large as an entire building or as small as a single
switch inside a wiring closet. In a geographic VLAN structure, it is typical to find 80
percent of the traffic remote to the user (server farms and so on) and 20 percent of the
traffic local to the user (local server, printers, and so on).
Reference: Building Cisco Multilayer Switched Networks (Cisco Press) page 93
QUESTION 14:
The Certkiller LAN is becoming saturated with broadcasts and multicast traffic.
What could you do to help a network with many multicasts and broadcasts?
A. Creating smaller broadcast domains by implementing VLANs.
B. Separate nodes into different hubs.
C. Creating larger broadcast domains by implementing VLANs.
D. Separate nodes into different switches.
E. All of the above.
Answer: A
Explanation:
Controlling broadcast propagation throughout the network is important to reduce the
amount of overhead associated with these frames. Routers, which operate at Layer 3 of
the OSI model, provide broadcast domain segmentation for each interface. Switches can
also provide broadcast domain segmentation using virtual LANs (VLANs). A VLAN is a
group of switch ports, within a single or multiple switches, that is defined by the switch
hardware and/or software as a single broadcast domain. A VLANs goal is to group
devices connected to a switch into logical broadcast domains to control the effect that
broadcasts have on other connected devices. A VLAN can be characterized as a logical
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network.
Reference: Building Cisco Multilayer Switched Networks (Cisco Press) page 8
QUESTION 15:
In the three-layer hierarchical network design model; what’s associated with the
access layer? (Select two)
A. optimized transport structure
B. high port density
C. boundary definition
D. data encryption
E. local VLANs
F. route summaries
Answer: B, E
Explanation:
The access layer is the outermost layer, and it is composed of the least sophisticated
network equipment. The most important function of the access layer is high port density,
since these devices connect the individual end users. The access layers are also where
VLANs are implemented, since VLANs are assigned on a per-port basis.
QUESTION 16:
In the three-layer hierarchical network design model, what’s associated with the
core layer? (Select two)
A. Access control list
B. Data encryption
C. Optimized transport
D. Address aggregation
E. Packet switching
F. Boundary definition
Answer: C, E
Explanation:
A hierarchical network design includes the following three layers:
-The backbone (core) layer that provides optimal transport between sites
-The distribution layer that provides policy-based connectivity
-The local-access layer that provides workgroup/user access to the network
The distribution layer of the network is the demarcation point between the access and
core layers and helps to define and differentiate the core. The purpose of this layer is to
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provide boundary definition and is the place at which packet manipulation can take place.
In the campus environment, the distribution layer can include several functions, such as
the following:
Address or area aggregation
1. Departmental or workgroup access
2. Broadcast/multicast domain definition
3. Virtual LAN (VLAN) routing
4. Any media transitions that need to occur
5. Security
The distribution layer can be summarized as the layer that provides policy-based
connectivity
Reference: www.alteridem.net/networking/idg4/idgbasic.htm
QUESTION 17:
Two Certkiller switches are connected as shown below:
Configuration exhibit
Please refer to the exhibit above. Given the partial configuration of the two Cisco
Certkiller switches, which two statements are true about VLAN traffic? (Select two)
A. VLANs 1-5 will be blocked if fa0/10 goes down.
B. VLANs 6-10 will use fa0/10 as a backup only.
C. VLANs 1-5 will use fa0/10 as a backup only.
D. VLANs 6-10 have a port priority of 128 on fa0/10.
E. VLANs 1-10 are configured to load share between fa0/10 and fa0/12.
Answer: B, E
Explanation:
Spanning-Tree Protocol (STP) is a Layer 2 protocol that utilizes a special-purpose
algorithm to discover physical loops in a network and effect a logical loop-free topology.
STP creates a loop-free tree structure consisting of leaves and branches that span the
entire Layer 2 network. The actual mechanics of how bridges communicate and how the
STP algorithm works will be discussed at length in the following topics. Note that the
terms bridge and switch are used interchangeably when discussing STP. In addition,
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unless otherwise indicated, connections between switches are assumed to be trunks.
Load sharing can be accomplished using a couple of methods. The most common method
of load sharing is through root bridge placement on a per-VLAN basis. This will
distribute traffic for separate VLANs across separate paths to different root bridges. A
separate method divides the bandwidth supplied by parallel trunks connecting switches.
To avoid loops, STP normally blocks all but one parallel link between switches. Using
load sharing, traffic can be divided between the links according to which VLAN the
traffic belongs.
Load sharing can be configured on trunk ports by using STP port priorities or STP path
costs. For load sharing using STP port priorities, both load-sharing links must be
connected to the same switch. For load sharing using STP path costs, each load-sharing
link can be connected to the same switch or to two different switches.
Load Sharing Using STP Port Priorities
When two ports on the same switch form a loop, the STP port priority setting determines
which port is enabled and which port is in a blocking state. The priorities on a parallel
trunk port can be set so that the port carries all the traffic for a given VLAN. The trunk
port with the higher priority (lower values) for a VLAN is forwarding traffic for that
VLAN. The trunk port with the lower priority (higher values) for the same VLAN
remains in a Blocking state for that VLAN. One trunk port sends or receives all traffic for
the VLAN.
QUESTION 18:
SIMULATION
Certkiller topology exhibit:
You work as a network engineer at Certkiller .com. Certkiller .com is a large
international company with offices on all continents. You work at the Chicago
Office. Your boss at Certkiller .com, Miss Certkiller, has asked you to install a
Catalyst 3500 to provide for another 24 users. Your instructions are as follows:
* install it in an IDF
* extremely import to have the proper configuration of the Catalyst before it is
placed into the product information
* it should not participate in VTP
* it should forward VTP advertisements that are received on trunk ports
* all nontrunking interfaces, Fa0/1 to Fa0/24) should immediately to the forwarding
state of the Spanning tree.
* configure all Fast Ethernet ports (the user ports) such as they are nontrunking.
* the fastEthernet interfaces 0/12 through 0/24 should be placed in VLAN 20
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Answer:
Explanation:
Certkiller 1#conf t
Certkiller 1(config)#vtp mode transparent
Certkiller 1(config)#interface range fa0/1 – 24
Certkiller 1(config-if-range)#switchport mode access
Certkiller 1(config-if-range)#spanning-tree portfast
Certkiller 1(config)#interface range fa0/12 – 24
Certkiller 1(config-if-range)#switchport access vlan 20
Certkiller 1(config-if-range)#end
Certkiller 1# copy run start
Spanning tree PortFast is a Catalyst feature that causes a switch or trunk port to enter the
spanning tree Forwarding state immediately, bypassing the Listening and Learning states.
IOS-based switches only use PortFast on access ports connected to end stations.
When a device is connected to a port, the port normally enters the spanning tree Listening
state. When the Forward Delay timer expires, the port enters the Learning state. When
the Forward Delay timer expires a second time, the port is transitioned to the Forwarding
or Blocking state. When PortFast is enabled on a switch or trunk port, the port is
immediately transitioned to the Forwarding state. As soon as the switch detects the link,
the port is transitioned to the Forwarding state (less than 2 seconds after the cable is
plugged in).
Certkiller 1(Config-if-range)#switchport mode access : Brings the interfaces into access
mode
Certkiller 1(Config-if-range)#spanning-tree portfast : Enables the PortFast on interface.
Certkiller 1(Config-if-range)#switchport access vlan 20 : Makes the members of vlan 20
QUESTION 19:
The following output was seen on a Certkiller switch:
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Study the exhibit carefully. The Certkiller user who is connected to interface
FastEthernet 0/1 is on VLAN 10 and cannot access network resources. On the basis
of the information in the exhibit, which command sequence would correct the
problem?
A. Certkiller 1(config)# vlan 10
Certkiller 1(config-vlan)# no shut
B. Certkiller 1(config)# interface fastethernet 0/1
Certkiller 1(config-if)# switchport mode access
Certkiller 1(config-if)# switchport access vlan 10
C. Certkiller 1(config)# interface fastethernet 0/1
Certkiller 1(config-if)# switchport mode access
D. Certkiller 1(config)# interface fastethernet 0/1
Certkiller 1(config-if)# no shut
E. Certkiller 1(config)# vlan 10
Certkiller 1(config-vlan)# state active
Answer: D
Explanation:
In Exhibit Operation Mode is down, it means interface is in down state. Just bring into up
state using no shutdown command
QUESTION 20:
You need make configuration changes to an existing layer 3 switch in the Certkiller
network. On a multilayer Catalyst switch, which interface command is used to
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convert a Layer 3 interface to a Layer 2 interface?
A. switchport access vlan vlan-id
B. switchport
C. switchport mode access
D. no switchport
E. None of the above
Answer: B

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