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Home Cisco® 642-885

Cisco® 642-885 Exam Practice Questions (P. 5)

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Question #21
Which three statements are correct regarding PIM-SM? (Choose three.)
  1. A
    There are three ways to configure the RP: Static RP, Auto-RP, or BSR
  2. B
    PIM-SM only uses the RP rooted shared tree and has no option to switch over to the shortest path tree
  3. C
    Different RPs can be configured for different multicast groups to increase RP scalability
  4. D
    Candidate RPs and RP mapping agents are configured to enable Auto-RP
  5. E
    PIM-SM uses the implicit join model

Correct Answer:
ACD

Question #22
Which of the following is a feature added in IGMPv3?
  1. A
    Support for source filtering
  2. B
    Support for Host Membership Report and a Leave Group message
  3. C
    Uses a new variation of the Host Membership Query called the Group-Specific Host Membership Query
  4. D
    Uses an election process to determine the querying router on the LAN
  5. E
    Uses an election process to determine the designated router on the LAN
  6. F
    IPv6 support

Correct Answer:
A

Question #23
Which types of multicast distribution tree can PIM-SM use?
  1. A
    Only shared tree rooted at the source
  2. B
    Only shared tree rooted at the RP
  3. C
    Only shortest path tree rooted at the RP
  4. D
    Shared tree rooted at the source and shortest path tree switchover
  5. E
    Shared tree rooted at the RP and shortest path tree switchover
  6. F
    Shared tree rooted at the first-hop router and shortest path tree rooted at the RP

Correct Answer:
E

Question #24
Which multicast routing protocol is most optimal for supporting many-to-many multicast applications?
  1. A
    PIM-SM
  2. B
    PIM-BIDIR
  3. C
    MP-BGP
  4. D
    DVMRP
  5. E
    MSDP

Correct Answer:
B
PIM-Bidirectional Operations -
PIM Bidirectional (BIDIR) has one shared tree from sources to RP and from RP to receivers. This is unlike the PIM-SM, which is unidirectional by nature with multiple source trees - one per (S, G) or a shared tree from receiver to RP and multiple SG trees from RP to sources.
Benefits of PIM BIDIR are as follows:
As many sources for the same group use one and only state (*, G), only minimal states are required in each router.
No data triggered events.
Rendezvous Point (RP) router not required. The RP address only needs to be a routable address and need not exist on a physical device.

Question #25
Which statement is correct regarding using the TTL threshold to define the delivery boundaries of multicast traffic?
  1. A
    If a packet TTL is less than the specified TTL threshold, the packet is forwarded out of the interface
  2. B
    If a packet TTL is greater or equal to the specified TTL threshold, the packet is forwarded out of the interface
  3. C
    If a packet TTL is equal to the specified TTL threshold, the packet is dropped
  4. D
    When a multicast packet arrives, the TTL threshold value is decremented by 1. If the resulting TTL threshold value is greater than or equal to 0, the packet is

Correct Answer:
B

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