Home » SWITCH 642-813 Q&As » Section 7 - New Questions (March, 2012) » 642-813 Q&A – New Questions (21-25) (March, 2012)

642-813 Q&A – New Questions (21-25) (March, 2012)

Section 7 – New Questions (March, 2012)

QUESTION 21
Which of the following will generate an RSTP topology change notification? (Select the best answer.)
A.    an edge port that transitions to the forwarding state
B.    a non-edge port that transitions to the blocking state
C.    a non-edge port that transitions to the forwarding state
D.    an edge port that transitions to the blocking state
E.    any port that transitions to the blocking state
F.    any port that transitions to the forwarding state
Answer: C

QUESTION 22
What is the default VTP advertisement for subset advertisements in Catalyst switches that are in server or client mode?
A.    30 seconds
B.    5 minutes
C.    1 minute
D.    10 seconds
E.    5 seconds
Answer: B
Explanation:
The knowledge point of this question is the VTP advertisement.
By default, Catalyst switches issue summary advertisements in five-minute increments. Summary advertisements inform adjacent Catalysts of the current VTP domain name and the configuration revision number.

QUESTION 23
How does VTP pruning enhance network bandwidth?
A.    by restricting unicast traffic to across VTP domains
B.    by reducing unnecessary flooding of traffic to inactive VLANs
C.    by limiting the spreading of VLAN information
D.    by disabling periodic VTP updates
Answer: B
Explanation:
The knowledge point of this question is VTP pruning.
Reduce the unnecessary broadcast traffic by VTP pruning to increase the bandwidth.

QUESTION 24
Refer to the exhibit. Assume that Switch_ A is active for the standby group and the standby device has only the default HSRP configuration. What conclusion is valid?

327
A.    If port Fa1/1 on Switch_ A goes down, the standby device will take over as active.
B.    If the current standby device were to have the higher priority value, it would take over the role
of active for the HSRP group.
C.    If port Fa1/1 on Switch_ A goes down, the new priority value for the switch would be 190.
D.    If Switch_ A had the highest priority number, it would not take over as active router.
Answer: C
Explanation:
This question is about the configuration of HSRP.
The virtual ip is 10.10.10.10, and the priority is 200, the tracked interface is f1/1, and the preempt has been configured.
A we can not know whether the preempt have been configured in the othter devices.
B The same reason to A
C Since the traked interface has been configured, so if the interface comes down, its priority will be reduced to 10.
D because the SA has been configured with preempt, so its state turns to speak.

QUESTION 30
Assume that a host sends a packet to a destination IP address and that the CEF-based switch does not yet have a valid MAC address for the destination. How is the ARP entry (MAC address) of the next-hop destination in the FIB get?
A.    The sending host must send an ARP request for it
B.    All packets to the destination are dropped
C.    The Layer 3 forwarding engine (CEF hardware) must send an ARP request for it
D.    CEF must wait until the Layer 3 engine sends an ARP request for it
Answer: D
Explanation:
To the MPLS’ Catalyst switch which is based on cef, cef will only forward the packet to the new target without rewriting, it will add a new neighbor entry after sending a ARP request to the destination.

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