Home » SWITCH 642-813 Q&As » Section 7 - New Questions (March, 2012) » 642-813 Q&A – New Questions (16-20) (March, 2012)

642-813 Q&A – New Questions (16-20) (March, 2012)

Section 7 – New Questions (March, 2012)

QUESTION 16
Which optional feature of an Ethernet switch disables a port on a point-to-point link if the port does not receive traffic while Layer 1 status is up?
A.    BackboneFast
B.    UpLinkFast
C.    Loop Guard
D.    UDLD aggressive mode
E.    Fast Link Pulse bursts
F.    Link Control Word
Answer: D

Explanation:
The knowledge point of this question is UDLD.
In aggressive mode, if the link state of the port is determined to be bi-directional and the UDLD information times out while the link on the port is still up, UDLD tries to re-establish the state of the port. If not successful, the port is put into the errdisable state.

QUESTION 17
Which two statements are true about best practices in VLAN design? (Choose two.) *
A.    Routing should occur at the access layer if voice VLANs are utilized. Otherwise, routing should occur at the distribution layer.
B.    Routing may be performed at all layers but is most commonly done at the core and distribution layers.
C.    Routing should not be performed between VLANs located on separate switches.
D.    VLANs should be local to a switch.
E.    VLANs should be localized to a single switch unless voice VLANs are being utilized.
Answer: BD
Explanation:
The knowledge point of this question is the concept of VLAN.
Switched networks can be subdivided into VLANs. By definition, a VLAN is a single broadcast domain. All devices connected to the VLAN receive broadcasts from other VLAN members. However, devices connected to a different VLAN will not receive those same broadcasts.
VLANs and broadcast domains converge at the distribution layer, requiring routing, filtering, and security. The switches at this layer must be capable of performing multilayer switching with high throughput. Only certain Catalyst switch models can provide multilayer switching.

QUESTION 18
The following command was issued on a router that is being configured as the active HSRP router.

standby ip 10.2.1.1

Which statement is true about this command?
A.    This command will not work because the HSRP group information is missing
B.    The HSRP MAC address will be 0000 0c07 ac00
C.    The HSRP MAC address will be 0000 0c07 ac01.
D.    The HSRP MAC address will be 0000.070c ad01.
E.    This command will not work because the active parameter is missing
Answer: B

QUESTION 19
Which spanning-tree command would essentially disable spanning tree on an interface and make that interface susceptible to spanning-tree loops?
A.    spanning-tree portfast bpdufilter default
B.    spanning-tree bpdufilter enable
C.    spanning-tree portfast bpduguard default
D.    spanning-tree bpduguard enable
E.    spanning-tree guard root
Answer: B

QUESTION 20
Which statement correctly describes the results of the Ethernet switch global configuration command spanning-tree loopguard default?
A.    When any port receives a BPDU, it is put it in the error-disabled state.
B.    An interface is moved directly to the spanning-tree forwarding state without waiting for the standard forward-time delay.
C.    Prevents interfaces that are in a PortFast-operational state from sending or receiving BPDUs.
D.    Detects indirect link failures and starts the spanning-tree reconfiguration sooner.
E.    Prevents alternate or root ports from becoming designated ports because of a failure that leads to aunidirectional link.
F.    Provides fast convergence after a direct link failure where a root port transitions to the forwarding state immediately without going through the listening and learning states.
Answer: E

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