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CCNP SP english WARISSON GOMES > 4.1 Multicast II Flashcards > Flashcards

4.1 Multicast II Flashcards

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1
Q

What states are exchanged in MSDP sessions?

A

S,G

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2
Q

What is the purpose of the MSDP session?

A

Exchange information about sources between RPs in different domains. Or even within the same domain when used in anycast RP mode.

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3
Q

What is the role of the following protocols in interdomain multicast communication? PIM-SM MSDP MP-BGP

A

PIM-SM - Builds the MDT, MSDP - Exchanges S,G states between RPs, MP-BGP - Exchanges unicast routes used for RPF

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4
Q

The prefixes announced by MP-BGP do not contain multicast addresses.

A

True

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5
Q

In interdomain SSM scenarios, there is no need for MSDP.

A

True

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6
Q

In interdomain SSM scenarios, there is a need for MSDP.

A

False

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7
Q

MSDP is a dual stack protocol.

A

False, only v4

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8
Q

__________ provides a solution. The switch listens to IGMP messages on Layer ___, and interprets them silently, to keep track of which host has subscribed to which group.

A

IGMP snooping, 3

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9
Q

With __________ the switch interprets all Layer 3 PIM messages. This way it learns which router wants to subscribe to which group and can forward the multicast traffic only to the correct ports.

A

PIM snooping

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10
Q

Multipoint LDP supports the creation of point-to-multipoint as well as multipoint-to-multipoint MDTs.

A

True

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11
Q

Multipoint LDP does not use the same control and data plane for unicast as for multicast, and thus simplifies operation and troubleshooting in an MPLS core.

A

False, it uses the same control and data plane.

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12
Q

Label Switching Multicast uses the same control plane as Label Switching Unicast.

A

True

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13
Q

Consider a group of LSRs connected to the same broadcast domain, which one should send PIM messages towards the backbone?

A

The DR

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14
Q

(S,G) timers are reset when a packet is forwarded.

A

True

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15
Q

(*,G) timers are reset when a packet is forwarded.

A

False

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16
Q

(S,G) timers are reset when a join is forwarded.

A

True

17
Q

The *,G state will be created when the LHR receives an IGMP Join.

A

True

18
Q

The LHR router will forward PIM messages without a defined RP.

A

False, without the RP there is no forwarding of PIM messages.

19
Q

Consider the entry below and answer: Is there an active sender for the group? (*, 224.10.10.10), 00:00:46/00:02:43, RP 10.100.255.4, flags: S Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Ethernet0/2, Forward/Sparse, 00:00:46/00:02:43

A

No, there is not.

20
Q

Consider the entry below and answer: Is there an active receiver for the group? (*, 224.10.10.10), 00:00:46/00:02:43, RP 10.100.255.4, flags: S Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Ethernet0/2, Forward/Sparse, 00:00:46/00:02:43

A

Yes, there is.

21
Q

Consider the entry below and answer: Is there an active receiver for the group? (10.100.13.1, 224.10.10.10), 00:00:10/00:02:49, flags: PA Incoming interface: Ethernet1/3, RPF nbr 10.100.46.6 Outgoing interface list: Null

A

No, there is not.

22
Q

Consider the entry below and answer: Is there an active sender for the group? (10.100.13.1, 224.10.10.10), 00:00:10/00:02:49, flags: PA Incoming interface: Ethernet1/3, RPF nbr 10.100.46.6 Outgoing interface list: Null

A

Yes, there is.

23
Q

Consider the entry below and answer: Is there an MDT created? (10.100.13.1, 224.10.10.10), 00:00:10/00:02:49, flags: PA Incoming interface: Ethernet1/3, RPF nbr 10.100.46.6 Outgoing interface list: Null

A

No

24
Q

Assume the sender registers before the receiver’s join. When the RP receives the receiver’s join, what PIM message will it originate to receive traffic from the sender?

A

RP sends PIM join towards the sender to construct the temporary Source Tree.

25
Q

True or false: The switchover to an SPT is configurable with a bandwidth threshold. ‘If the multicast data traffic is more than x kbit/s, join SPT.’ The default is 100 kbit/s, meaning that the LHR will immediately join the SPT.

A

True and false. The default is zero kbit/s, meaning that the LHR will immediately join the SPT.

26
Q

True or false: A threshold of infinity means that the LHR will never join the Shared Tree.

A

False, it would never join the SPT.

27
Q

When an LHR receives an IGMP Leave, it originates a prune to the RP and a prune to the FHR.

A

True. False in part, this is not automatic, the prune is originated as soon as a new multicast packet destined for the receiver arrives.

28
Q

In an SSM environment, if there are IGMPv2-only capable receivers, it is possible to map multicast groups to specific senders.

A

True, this allows IGMPv2-only hosts to receive flow in an SSM network.

29
Q

There are two ways to configure SSM mapping: Dynamic, and Domain Name System (DNS)-based.

A

False: There are two ways to configure SSM mapping: Static, and Domain Name System (DNS)-based.

30
Q

In BIDIR-PIM, there is no register message for initial traffic to the RP; from the first packet, the traffic is sent natively.

A

True

31
Q

In PIM-ASM, loops are avoided with the Reverse Path Forwarding (RPF) check. In BIDIR-PIM, there is a different mechanism to ensure loop-free forwarding: the Designated Forwarder (DF).

A

True

32
Q

In a PIM BiDir scenario, if there are multiple RPs, there will be multiple DFs.

A

True

33
Q

What is the main criterion for DF election?

A

Lowest metric to the RP wins.

34
Q

What is the purpose of the Tunnel 0 interface created when the RP is configured?

A

Encapsulate unicast messages from the FHR, for example, to the RP.

35
Q

In BiDir, the router responsible for forwarding multicast packets received on that network ‘upstream’ to the RP is the ___________

A

Designated Forwarder

36
Q

From the DF election messages: ____ : Router announces its metric to the RP, Winner: Router declares itself as DF, ____: RouterA detects another RouterB with a better metric, RouterA remains as DF during the Backoff Timer, Pass: RouterA detects another RouterB with a better metric and passes the DF status to RouterB.

A

Offer, Backoff

37
Q

From the DF election messages: Offer : Router announces its metric to the RP, _____: Router declares itself as DF, Backoff: RouterA detects another RouterB with a better metric, RouterA remains as DF during the Backoff Timer, _____: RouterA detects another RouterB with a better metric and passes the DF status to RouterB.

A

Winner, Pass

CCNP SP english WARISSON GOMES (41 decks)

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