testking Cisco:ccnp bcmsn 642-812 Exam
Questions & Answers 642-812 – Questions & Answers
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Updated : 08/08/2008

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1. Which switch command enables a trunking protocol that appends a four byte CRC to the packet?
A. Switch(config-if)#switchport trunk encapsulation dot1q
B. Switch(config-if)#switchport trunk encapsulation itef
C. Switch(config-if)#switchport trunk encapsulation fddi
D. Switch(config-if)#switchport trunk encapsulation isl
Answer: D

2. What action should a network administrator take to enable VTP pruning on an entire management domain?
A. enable VTP pruning on any client switch in the domain
B. enable VTP pruning on every switch in the domain
C. enable VTP pruning on any switch in the management domain
D. enable VTP pruning on a VTP server in the management domain
Answer: D
3. Which statement describes Dynamic Trunking Protocol (DTP) mode ‘desirable’?
A. The interface is put into permanent trunking mode and negotiates to convert the link into a trunk link.
B. The interface actively attempts to convert the link to a trunk link.
C. The interface is put into permanent trunking mode but prevented from generating DTP frames.
D. The interface is put into a passive mode, waiting to convert the link to a trunk link.
Answer: B

4. Which three statements are correct with regard to the IEEE 802.1Q standard? (Choose three.)
A. the packet is encapsulated with a 26 byte header and a 4 byte FCS
B. the IEEE 802.1Q frame format adds a 4 byte field to a Ethernet frame
C. the IEEE 802.1Q frame retains the original MAC destination address
D. the IEEE 802.1Q frame uses multicast destination of 0×01-00-0c-00-00
E. protocol uses point-to-point connectivity
F. protocol uses point-to-multipoint connectivity
Answer: BCE

5. In a customer’s network, VLAN Trunking Protocol (VTP) is running with a domain named main1. VLANs
1,2,3,4,5,10,20 are active on the network. Suddenly the whole network goes down. No traffic is being passed on
VLANs 2,3,4,5,10,20, however traffic passes on VLAN 1 and indicates all switches are operational. Right before
the network problem occurred, a switch named TEST1 was added to the network. What three configuration issues

on TEST1 could be causing the network outage? (Choose three.)
A. TEST1 is configured as a VTP server with a different domain name.
B. TEST1 is not configured to participate in VTP.
C. TEST1 is configured as a VTP server with the domain name main1.
D. TEST1 has a lower VTP configuration revision than the current VTP revision.
E. TEST1 has a higher VTP configuration revision than the current VTP revision.
F. TEST1 is configured with only VLAN1.
Answer: CEF

6. Which DTP switchport mode parameter sets the switch port to actively send and respond to DTP negotiation
frames?
A. access
B. trunk
C. no negotiate
D. dynamic desirable
E. dynamic auto
Answer: D

7. Which method of Layer 3 switching uses a forwarding information base (FIB)?
A. route caching
B. flow-based switching
C. demand-based switching
D. topology-based switching
Answer: D

8. Which protocol specified by RFC 2281 provides network redundancy for IP networks, ensuring that user traffic
immediately and transparently recovers from first-hop failures in network edge devices or access circuits?
A. STP
B. IRDP
C. ICMP
D. HSRP
Answer: D
9. In which three HSRP states do routers send hello messages? (Choose three.)
A. standby
B. learn
C. listen
D. speak
E. active
Answer: ADE

10. Which protocol enables a group of routers to form a single virtual router and use the real IP address of a router
as the gateway address?
A. Proxy ARP
B. HSRP
C. IRDP
D. VRRP
E. GLBP
Answer: D

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