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

“Building Cisco Multilayer Switched Networks”, also known as 642-812 exam, is a Cisco certification.
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You are the network administrator at Certkiller and switch CK1 is configured as
shown below:
Interface gigethernet 0/1
Switchport mode trunk
Switchport trunk encapsulation dot1q
Switchport trunk native vlan 5
If untagged frames are arriving on interface gigethernet 0/1 of CK1 , which of the
following statement are correct?

A. Untagged frames are automatically assumed to be in VLAN 5.
B. Untagged frames are defaulted to VLAN 1 traffic.
C. Untagged frames are dropped because all packets are tagged when dot1q trunked.
D. Untagged frames are determined on the other switch
E. Untagged frames are not supported on 802.1Q trunks.

Answer: A

Explanation:
Each physical port has a parameter called PVID. Every 802.1Q port is assigned a PVID
value that is of its native VLAN ID (default is VLAN 1). All untagged frames are
assigned to the LAN specified in the PVID parameter. When a tagged frame is received
by a port, the tag is respected. If the frame is untagged, the value contained in the PVID
is considered as a tag. All untagged frames will be assigned to the native VLAN. The
native VLAN is 1 by default, but in this case the native VLAN is configured as VLAN 5
so choice A is correct.

QUESTION 49:

If you were to set up a VLAN trunk over a Fast Ethernet link on switch CK1 , which
trunk mode would you set the local port to on CK1 if you wanted it to respond to
requests from its link partner ( CK2 ) and become a trunk?

A. Auto
B. Negotiate
C. Designate
D. No negotiate

Answer: A

Explanation:
Only ports in desirable and auto mode will negotiate a channel (either desirable-auto or
desirable-desirable). Ports in on mode will only form a functional channel with other
ports in on mode (they will not negotiate a channel with ports in desirable or auto mode).
Reference: Cisco, Troubleshooting Tips

http://www.cisco.com/univercd/cc/td/doc/product/lan/cat5000/trbl_ja.htm

QUESTION 50:

Which of the following trunking modes are unable to request their ports to convert
their links into trunk links? (Select all that apply)

A. Negotiate
B. Designate
C. No negotiate
D. Auto
E. Manual
F. Off

Answer: C, D

Explanation:
Auto is a trunking mode but does not actively negotiate a trunk. It requires opposite side
to be trunk or desirable, and will only respond to requests from the other trunk link.
No-negotiate will configure the link to be unable to dynamically become a trunk; since
no requests will be sent it will not respond to requests from other trunk links from a
different switch.
Incorrect Answers:
A, B, E, F: These choices are wrong because they are not valid trunking modes

QUESTION 51:

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ISL is being configured on a Certkiller switch. Which of the following choices are
true regarding the ISL protocol? (Select two)
A. It can be used between Cisco and non-Cisco switch devices.
B. It calculates a new CRC field on top of the existing CRC field.
C. It adds 4 bytes of protocol-specific information to the original Ethernet frame.
D. It adds 30 bytes of protocol-specific information to the original Ethernet frame.

Answer: B, D

Explanation:
ISL adds a total of 30bytes to the Ethernet frame. A 26 byte header (10bytes identifies
the VLAN ID) and a 4 byte trailer (containing a separate CRC).
Incorrect Answers:
A: This is incorrect because ISL is Cisco proprietary and can only be used on Cisco
devices. For configuring a trunk to a non-Cisco switch, 802.1Q encapsulation should be
used.
C: This is incorrect because it is contradictory to D. 30 byes are added with ISL, not 4
bytes. This choice describes what is used in 802.1Q frames, not ISL
QUESTION 52:

You are the network administrator tasked with designing a switching solution for
the Certkiller network. Which of the following statements describing trunk links are
INCORRECT? (Select all that apply)

A. The trunk link belongs to a specific VLAN.
B. Multiple trunk links are used to connect multiple end user devices.
C. A trunk link only supports native VLAN.
D. Trunk links use 802.10 to identify a VLAN.
E. The native VLAN of the trunk link is the VLAN that the trunk uses for untagged
packets.

Answer: A, B, C, D

Explanation:
A trunk is a point-to-point link that transmits and receives traffic between switches or
between switches and routers. Trunks carry the traffic of multiple VLANs and can extend
VLANs across an entire network. 100BaseT and Gigabit Ethernet trunks use Cisco ISL
(the default protocol) or industry-standard IEEE 802.1Q to carry traffic for multiple
VLANs over a single link. Frames received from users in the administratively-defined
VLANs are identified or tagged for transmission to other devices. Based on rules you

define, a unique identifier (the tag) is inserted in each frame header before it is
forwarded. The tag is examined and understood by each device before any broadcasts or
transmission to other switches, routers, or end stations. When the frame reaches the last
switch or router, the tag is removed before the frame is transmitted to the target end
station.
Incorrect Answers:

Questions and Answers : 346 Q&As
Updated: 2008-09-11
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